Multi-pulses surge protective device MSPD

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Multi-pulses surge protective device MSPD


Scope

This is only one additional test for IEC 61643-11:2011. This additional test can be applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages. These devices are packaged to be connected to 50/60 Hz a.c. power circuits, and equipment rated up to 1 000 V r.m.s.

Performance characteristics, standard methods for testing and ratings are established. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.

Normative references

IEC 61643-11:2011, Low-voltage surge protective device – Part 11: surge protective devices connected to low-voltage power systems-requirements and test method

3.Terms, definitions, and abbreviations

3.1.101 (MSPD) Multi-pulses surge protective device

SPD that is capable of being subjected to multiple impulse strokes at one discharge and being tested with multiple pulse combination waves

Note: if the manufacturer declares the SPD can withstand multiple impulse stokes, MSPD needs to pass the test requirement for (MCW) Multi-pulses combination wave.

3.1.102 (MCW) Multi-pulses combination wave

Impulse current waveform combined by multiple pulses according to a certain amplitude and time interval

8.3.101 test requirement for (MCW) Multi-pulses combination wave

The test is applied for MSPD which is only for connection L-PE/N in TN, TT and IT system.

For this test, three new samples shall be used and the relevant requirements for this test refer to the IEC 61643-11:2011 Clause 8

8.3.101.1 test parameter of (MCW) Multi-pulses combination wave

Total impulse8/20 current impulses (μs)the peak values for the first and the tenth impulse (kA)The peak values from the second to the 9th impulse (kA)The interval time from the first to the 9th impulse (ms)The interval time between the 9th and 10th impulse (ms)Total duration time (ms)
108/20μs1005060       400880.5

Note: the above table is only for the maximum parameter of MCW so far as the reference, the manufacturer can declare their own specified parameter of MCW of the MSPD in the form as the clause 8.3.101.3 shows. The interval time must be accompany with the above table shows that the interval time from the first to the last second is 60 ms, and interval time between the last two impulses is 400 ms.

8.3.101.2 Typical waveform of the multi-pulses current generator

Typical waveform of the multi-pulses current generator

8.3.101.3 Identification of Multi-pulses combination wave parameters

e.g. MS-8/20μs-10p/20kA
MS – Multi-pulses
8/20μs – current impulse
10p – 10 pulses
20kA – The peak values from the second to the 9th impulse

8.3.101.4 test circuit diagram

Only the Uref=255 V, prospective short-circuit current of this power source more than 100 A is required in the test. The other distribution power system is considering. If the manufacturers declare External disconnectors, the External disconnectors should apply to connect during the test, but the external disconnection should not occur.

test circuit diagram- Multi-pulses surge protective device MSPD

8.3.101.5 Pass Criteria

Pass Criteria
During the test, there shall be no visual evidence of burning of the sample.
SPDs with an IP degree equal to, or greater than, IP20 shall not have live parts accessible with the standardized test finger applied with a force of 5 N (see IEC 60529), except the live parts which were already accessible before the test when the SPD is fitted as in normal use.
The SPD shall be connected as for normal use according to the manufacturer’s instructions to a power supply at the reference test voltage (UREF). The current that flows through each terminal is measured.
a)Multi-pulse failure mode

After the SPD fully passing the ten pulse current, the internal disconnection occurs, there shall be clear evidence of effective and permanent disconnection of the corresponding protective component (s).

In order to check this requirement, the power frequency voltage equal to Uc is applied 1 min, and the current passed shall not exceed the 0.5 mA rms

b)Multi-pulse withstand mode

During the test, the thermal stability shall be achieved. The SPD is considered to be thermally stable if the crest of the resistive component of the current flowing into the SPD or the power dissipation shows either a decreasing tendency or does not increase during 15 min of Uref voltage.

The current shall not have changed by more than 50% compared to the initial value determined at the beginning of the relevant test sequence

Values for measured limiting voltage after the test shall be below or equal to UP. The measured limiting voltage shall be determined, using the tests described in 8.3.3, but the test of 8.3.3.1 is performed only with a 8/20-surge current with a crest value of Iimp for Test Class I or with In for Test Class II or with the test of 8.3.3.3 but only at UOC for Test class III.
Auxiliary circuit, such as status indicator, should be in normal working condition. Visually inspect the sample and there should be no signs of damage.

TUV Rheinland released new criteria 2 PfG 2634.08.17 – Additional test for Multi-pulses Surge protective devices connected to low-voltage power systems – Requirements and test methods

The standard on the basis of the original international standard test increases the multiple-pulses test, the test technology closer to the line transmission distribution side of the SPD surge in environment simulation, affected by the natural lightning physical characteristics for understanding thunder and lightning, lightning defense provides a new platform for the high level research, is advantageous for the targeted development to adapt to the different application in the field of lightning protection products, to provide the rectification of the running of hundreds of millions of SPD only online technical support, will also promote global SPD R&D and production technology upgrading.

The conference invited many experts in the field of the SPD, together for the SPD related enterprise management, technology, quality, research and development of personnel to unscramble the SPD new standards, to help enterprises to enhance research and development ability, designed to meet the requirements of quality products, help each big manufacturer to enter the international market, promote the enterprise image.

The SPD testing standard from single-pulse to multi-pulse

With the continuous development of electronic technology, all kinds of advanced electronic products are widely used in construction, transportation, electric power, communication, chemical industry and other fields, and with the low voltage power distribution system in a variety of electrical components of the intelligent gradually, a large number of low pressure value, high sensitivity, high integration of electronic components to the application. However, lightning overvoltage or operating overvoltage, often bring fatal harm to the electronic components. Therefore, in order to prevent lightning overvoltage and operating over-voltage damage to the electrical and electronic equipment and improve the safety and reliability of equipment system, all kinds of SPD products has been widely used.

However, due to the human physical characteristics of the thunder also lacks enough clear and definite understanding, lightning causes many kinds of theories are based on some prerequisites and hypothesis, and the wide application of surge protector, lightning protection products, mainly based on the understanding of the single pulse lightning. Global production of the SPD in the past are also in accordance with the international electrotechnical commission IEC 61643 products research and development and production of technical standards, and by lightning high-voltage laboratories use 10/350μs or 8/20μs test of single pulse shock wave.

In fact, in recent years the monitoring results of the thunder and lightning and thunder and lightning protection practice show that the lightning with a single pulse high voltage laboratory test SPD methods, and the facts of the real lightning stroke at a time of multiple pulse, by single pulse inspection of SPD in real tolerance when struck by lightning, and its nominal value, also often leads to the SPD overheat burst into flames, causing fire accident. Therefore, can withstand shock pulses SPD become more urgent needs in the field of lightning protection at home and abroad, also provides manufacturers with good opportunities for development.

But as a result of the SPD manufacturers update a lack of understanding of appropriate standards, there are some limitations in terms of product design, causes the SPD production enterprises difficult to achieve breakthroughs in product development and production, struggling in exploring international market.

In order to promote the development of resistance to multiple pulse impact the SPD product, TUV Rheinland joint domestic authority of the SPD testing agencies – “Beijing Leishan Testing Center”, combining with the characteristics of domestic enterprises, with the SPD multiple pulse testing and certification standards and solutions, for related enterprises to provide fast and comprehensive solutions, assist the SPD enterprises into the international market.

The SPD TUV Rheinland certification has been widely recognized in the world, the experienced experts to provide safety and quality assurance for the product, and help customers to get the latest technical knowledge and market dynamics. In addition, the TUV Rheinland owns the entire customer base, can assist the SPD manufacturers expand customer channels.

Multiple-pulses surge protector (MSPD) background and current situation of the test standard

In November 2017, Germany TUV Rheinland Group released the “connect to low-voltage power supply system of multiple pulse surge protective device additional test – performance requirements and test methods (IEC61643.11-2011/2 PFG 2634), and “Beijing Leishan Testing Center” TUV Rheinland SPD product cooperation lab opening.

2 PFG 2634/08.17 standard is based on the original international standard test increases the multiple pulse test, the test technology is more close to the line transmission distribution side of the SPD surge environment influenced by natural lightning physical characteristics, for meet the thunder, lightning defense provides a research direction of higher level, is advantageous for the targeted development to adapt to the different application in the field of lightning protection products, to provide the rectification of the running of hundreds of millions of SPD only online technical support, promote global SPD R&D and production technology upgrading.

Duration 2 PFG 2634/08.17 standard released the second anniversary, the director of Sun Yong of “Beijing Leishan Testing Center” and The engineer Yang Yongming of Germany Rhine TUV, jointly reviewed the 2 PFG 2634/08.17 test standard drafting process, and introduces the present development situation.

Sun Yong: multiple-pulses standard drafting process

In 2016 Beijing Leishan company established the lightning multiple pulse high voltage laboratory. Surge protector by the multiple pulse of China invention patent holder surge protector (MSPD) and multiple pulse test standard (draft) draftsman, the famous lightning protection expert Yang Shaojie authorization, the “Beijing Leishan Testing Center” won the surge protector MSPD write multiple pulse test standard (draft) of copyright. To this end, Beijing lightning center organization technical team of MSPD and single pulse of current surge protector (SPD) for further study. After thousands of times of component testing, including the T1, T2 and T3 MSPD and SPD and used in the production of various specifications of MOV surge protector, GDT, open, micro fracture and SCB components, such as transmission cables, air terminals etc, accumulated a large amount of test data, to write multiple pulse surge protector MSPD test standard provides important data to support.

Surge protector MSPD multiple pulse test standard of writing, with reference to the international conference on power grid (CIGRE) published in 2013, the technical report engineering application of lightning parameters (English version), this article is for the big international grid meeting published more than 30 years ago, the parameters of the lightning (Berger, k. Anderson R.B. and Kroninger h. 1975. The Electra No. 41, pp. 23-37) published in 1980 and the engineering application of lightning parameters (Anderson R.B. and Eriksson A.J. 1980. Electra No. 69, pp. 65-102.) the revision. This paper clearly pointed out in the summary: “more than 80% of the flash is negative to consisting of two or more than two back. This percentage significantly higher than the previous Andersonand Eriksson (1980), which is based on the records of inaccurate estimate of 55%.Each flash average response times for 3-5, about 60 ms interval geometric average. About one-third to one-half of the flash, in a few kilometers apart two or more than two locations. But each flash only a position record, lightning density measured value correction factor is about 1.5 to 1.7, significantly higher than the Anderson and Eriksson 1.1 (1980) had previously estimated. Response for the first time the peak current usually is greater than later after the return current peak 2 to 3 times. However, about a third of the flash contains at least one after having a large peak electric field after back. In theory, its current peak also should be greater than the first time. Is greater than the first hit back after the return to power lines and other system constitutes the additional threat “.

On August 12, 2008, Guangzhou negative polarity field test base of artificial triggering lightning thunder lightning has eight times, the Chinese Academy of Sciences atmosphere Qie xiushu team summarizes artificial triggering lightning experiments in Shandong province from 2005 to 2010 as a whole, in the observed 22 lightning discharge, 95% for pulse, 17 times discharge time more than 400 ms (millisecond), maximum pulse number 11.Engineering application of electrical parameters on the phenomenon of lightning discharge pulse more quantitative description, further proves that the combination of multiple pulse characteristics are universal: namely the combination of multiple pulse wave has two maximum, the average pulse interval is 60 ms, finally a pulse with a pulse interval before 400 ms. Surprisingly, a famous SPD, used to test the nominal discharge current 20 kA, measured through the 1.64 kA lightning current fire explosion (8 pulses).This experiment, not only observed multiple pulse of lightning discharge phenomenon, but also illustrates the research can be used in multiple pulse lightning pulse discharge phenomenon of MSPD importance and urgency.

A combination of international and domestic for lightning impulse phenomenon of observation and test data, editorial committee adopted the 8/20μs (including 10 S pulse as the combined pulse MSPD impact current wave.

According to the physical parameters of lightning discharge pulse more, multiple pulse wave, the first pulse and the last one pulse amplitude of nominal value, intermediate pulse amplitude for 1/2 nominal value; The first pulse to pulse interval between 9 to 60 ms, before finally a pulse with a pulse interval is 400 ms.

Should clear, certain specifications, single pulse without backup protection device (SPD) can also be through five of the combined pulse wave impact. According to the national test standard, after the backup protection device and the SPD series multiple pulse shock wave, or don’t have to replace copper nonlinear components of short-circuit tolerance test, the basic can’t pass the test. The fact that contributed to the drawing board to write multiple pulse MSPD the urgency of the test standard, because only the written work as soon as possible, via a standard guide, for lightning protection technology research and development personnel and production enterprises pulse MSPD direction, can effectively promote the lightning protection of the improvement of product technology and the healthy development of the lightning protection and disaster mitigation.

Yang Yongming: multiple-pulses MSPD test standard enacted over the past two years

2 PFG 2634 “connect to low voltage power supply system of multiple pulse surge protective device additional test – performance requirements and test methods” enacted after the relevant domestic and international organization for standardization response quickly.

Society in 2018, “the society released 2018 annual standard (first) planning of notice” (public word [2018] no. 50), approved by Nanjing Kuanyong Electronics Co., Ltd., writing of the highway multiple pulse lightning protection design specification and technology standard “.

In 2018, live to build a project, or committee to write “the pulse of the low-voltage distribution system surge protector – performance requirements and test methods.

ILPS held in Shenzhen in 2018, the 4th international symposium on lightning protection, the chairman of the International Electrotechnical Commission IEC SC37A Alain Rousseau specifically mentioned this standard, and in the heart of the speeches PPT the IEC61643.11-2011/2 PFG 2634 “connect to low voltage power supply system of multiple pulse surge protective device additional test – performance requirements and test methods of joint use, for the first time by the Chinese to write your own premises must be approved by the IEC international standards.

In 2019, the Chinese meteorological services association approved Beijing lightning detection center project to write the lightning impulse test more general guidelines, it is a foundation to the development of multiple pulse technology standard, the standard stipulated in the pulse interval, waveform requirements, all of these are based on 30 years of international natural lightning engineering parameters research, statistical induction general wave form the standardization of laboratory.

In July 2019, the International Electrotechnical Commission (IEC) issued IEC61400-24-2019 “the lightning protection of wind energy system” first 8.5.5.12: the resistance of the SPD lightning pulse more shocks. Because of the wind turbine lightning under high frequency, and the SPD in the wind turbine is very critical, so should be able to withstand multiple SPD lightning.(note: multiple strokes; Multiple Pulse; Multiple flashes. Multi – pulse can be translated into multiple pulse).

Solstice on 30 October 2019 on October 31, by the Beijing lightning protection device test center, the lightning protection of academic committee of China architectural society led editor group standard “the pulse of the low-voltage distribution system surge protector – performance requirements and test methods of working group meeting will be held in Beijing. According to the architectural society of China architectural society of China in 2019 standard planning “, required by the unit in compilation work completed by the end of June 2020 standard.

Sun Yong: about multiple-pulses waveform parameters of shock wave

In spite of the international and domestic SPD testing standards, useful 10/350μs waveform for classification of SPD impulse current test for T1, adapt to the 10/350μs current shock of SPD generally need to use the switch type device, flow cut-off type switch device is a difficult problem, and pressure limiting device on the response time is another problem. Internationally, the 10/350μs waveform parameters used for the SPD impulse current test has been controversial. A large number of observed data show that 10/350μs waveform and natural lightning discharge form of multiple pulse waveform parameters, 8/20μs than 10/350μs waveform parameter s waveform parameters is closer to nature lightning discharge pulse waveform parameters, and the simulation of natural lightning pulse waveform parameters as far as possible is the pursuit of laboratory. This is the drawing board with 8/20μs waveform parameters as MSPD impact current wave, one of the reasons.

According to the international and domestic SPD testing standard, measure whether the SPD can be classified as T1 parameter is not the most important index of impulse current waveform parameters, but the impact of discharge current peak Iimp; Specific energy charge Q and W/R. National standard GB50057-2010 by code for design of building lightning protection T1 is 12.5 KA of the Q value of 6.25 AS; W/R value of 39 kj/Ω.

To this end, we laboratory use 8/20μs waveform of 10 mu s pulse wave, the pressure limiting type multiple pulse MSPD experiment.60 ka surge current of the Q value of 6.31 AS; W/R is 52.90 kj/Ω. Data show that multiple pulse MSPD type uses the pressure limiting device can completely through the T1 test, well solved using type switch devices are two big problems. This is the drawing board with 8/20μs waveform parameters as MSPD impulse current wave, another reason.

Yang Yongming: China’s multi-pulses MSPD technology more aroused the concern of the international competitors

China multiple pulse MSPD core technology by Guangdong shield company after nearly a decade of research and a large number of trials have, more than 2014 years of T1, T2 and T3 pulse MSPD gained national patent. Internationally, there are the United States, Germany, Singapore, Bangladesh, France and other countries lightning protection experts to review and discuss., chairman of IEC 2014 SC37A Alain Rousseau personally led the two German experts to shield, the ground to the performance of the single pulse SPD and pulse MSPD contrast experiment, October 13, 2014, the 32nd session of ICLP’s conference in Shanghai, Alain chairman made a titled “to increase pulse test” for the SPD’s speech.

Sun Yong: MSPD series products in the market demand

After a lot of testing, MSPD batch production of specialized components supply chain is established. Starting in 2019, using the shield of Guangdong multi-pulses MSPD patent technology of MSPD series products passed the Beijing lightning center IEC61643.11-2011/2 PFG 2634 “connect to low voltage power supply system of multiple pulse surge protective device additional test – performance requirements and test methods of detection, come into the market.

There is no doubt that in multiple pulse MSPD test standard, under the guide of MSPD in China will gradually replace traditional SPD, provide high quality technical service for the lightning protection and disaster mitigation, in order to ensure the security of China’s economic construction and people’s life and property play a positive role. Can be predicted that in our country, the standardization management in the field of lightning protection, lightning protection experts and researchers, as well as the evaluation, testing and engineering technical personnel’s joint efforts, in the near future, China’s surge protection devices (SPDs) cause will be up to a new level, and will go abroad, the service of the world.

Surge protective devices (SPDs), the necessity of multiple-pulses test by TUV certification

At present, human technology is still a lack of clear enough for lightning protection and clear cognition, big in the field of all imaginable, small to a small box, there are requirements of lightning protection, lightning protection method also has a lot of, such as the lightning rod guide, uses the same charges generator, and is currently the most used surge protector (SPD), is a kind of for various kinds of electronic equipment, instrumentation, communications lines provide security protection of the electronic device. Due to lightning highly destructive, instantaneous current can reach hundreds of thousands of amps, often bring fatal harm to electronic components. Therefore, in order to improve the safety and reliability of equipment system, all kinds of surge protector (SPD) has been widely used. The corresponding surge protector TUV certification requirements is also very big.

Lightning causes a variety of theories, on the other hand, based on some prerequisites and hypothesis, which affects the development of the technique of lightning protection, so the current widely used in the surge protector (SPD), such as lightning protection products are based on single pulse lightning know, IEC (International Electrotechnical Commission) will surge protector (SPD) performance testing experiment waveform is defined as 8/20μs and 10/350μs wave, etc.

The SPD testing standard from single-pulse to multi-pulse

At present, the global lightning high-voltage laboratory according to IEC 61643-2011 for the SPD with single waveform test, while the impact of a single waveform is not in conformity with the physical characteristics of natural lightning (90% natural lightning discharge is negative stroke, at the same time sequence pulse discharge process).According to the standard test qualified products online runtime burst into flames problems still exist, for electricity, communications, safety brought huge losses, etc. IEC standard of SPD mainly solved the different applications of the SPD design agency requirements and single impact resistance, short circuit resistance, TOV tolerance ability under the condition of lightning and the lightning safety. Is IEC standard for the newest trend of IEC next update about launched in 2019, the whole architecture compared to the current larger happens, will be based on IEC 61643-1 basic concepts and requirements, to 11 for the power SPD testing methods and requirements, – 21 for signal SPD testing methods and requirements, – 31 for photovoltaic SPD testing methods and requirements, – 41 for dc SPD testing methods and requirements.

For a discharge of repeated impact problem has always been an important issue in the field of lightning protection research in the world. Based on this, Germany Rheinland TUV drafted 2 PFG 2634/08.17 SPD multiple pulse technology standards. The standard on the basis of the original international standard test increases the multiple pulse test, the test technology is more close to the simulation of natural lightning physical characteristics, to meet the thunder, defense thunderbolt provides a new platform for the high level research, is advantageous for the targeted development to adapt to the different application in the field of lightning protection products, to provide online the rectification of the running of hundreds of millions of SPD only technical support, will also push for global SPD R&D and production technology upgrades.

Due to the SPD manufacturers update a lack of understanding of appropriate standards, there are some limitations in terms of product design, causes the SPD production enterprises difficult to achieve breakthroughs in product development and production, struggling in exploring international market.

In order to promote the development of resistance to multiple pulse impact the SPD product, TUV Rheinland joint domestic authority of the SPD testing institutions, combining with the characteristics of domestic enterprises and for related enterprises to provide fast and comprehensive solutions, assist the SPD enterprises into the international market.

The SPD TUV Rheinland certification has been widely recognized in the world, the experienced experts to provide safety and quality assurance for the product, and help customers to get the latest technical knowledge and market dynamics. In addition, the TUV Rheinland owns the entire customer base, can assist the SPD manufacturers expand customer channels.

The result and research about surge protective devices (SPDs) testing by 10 pulse and multi-pulses

1.Device Under Test (DUT) and Waveform set

1.1 DUT

An epoxy coated varistor In=20kA, Imax=40kA, 3 varistors were parallel connection, Divided into two groups list as below
GroupUc (V)In (kA)
Group A42020
Group B75020

1.2 Waveform

10 typical experiment waveform, pulse 8/20μs = 2 times among 8 pulse amplitude, time interval as follows: the first nine pulse – 60 ms pulse interval, the last pulse – 400 ms pulse interval. In applying 10 pulses at the same time, the processing frequency power supply of 255V/100A. The typical waveform has been written to QX industry standard in China and is drafting 2 PGF technology TUV Rheinland certification standard, as the research route of transmission of multiple-pulses test waveforms on the performance of the surge protector.

As the research route of transmission of multiple pulse test waveforms on the performance of the surge protector

2.Group A – DUT

Group A – the results of multiple-pulses testing at different amplitude

Current (fore and after – middle)Pulse numberVoltage after impactPhenomenon
60-309Fire
40-2010trigger release
30-15106801 MOV trigger release after 5 second
30-1510670in good condition

Group A – these set of product design of protection for single pulse In = 60 kA, but at 10 pulse, under amplitude of 30 and 60 kA, both damage during the seventh impact pulse, finally on fire at 255 V/100. Adjust test amplitude, found at 10 pulse amplitude of 40 to 20 kA, no damage in the process of impact, but after the shock all DUT trigger release; At 10 pulse amplitude of 30 to 15 kA, using a 2 DUT to test, only 1 DUT trigger release, you can probably predict the 10 pulse amplitude is the surge protector design tolerance limit.

3.Group B – the results of multiple-pulses testing at different amplitude

Current (fore and after – middle)Pulse numberVoltage after impactPhenomenon
60-309Fire
50-25101117/1109Surface temperature up to 90 degrees; in good condition
50-251183/11712 MOV trigger release
40-20101125/1112in good condition
40-20101115/1106in good condition

Group B – these set of product design of protection for single pulse In = 60 kA, but at 10 pulse, under amplitude of 30 and 60 kA, both damage during the ninth impact pulse, finally on fire at 255 V/100. Adjust test amplitude, found at 10 pulse amplitude of 50 to 25 kA, no damage in the process of impact, but after the shock all DUT’s Surface temperature up to 90 degrees, it means up to the critical of trigger release. At 10 pulse amplitude of 40 to 20 kA, using a 2 DUT to test, still in good condition, after cooling test starting voltage was completely normal, so you can probably predict the 10 pulse amplitude is the surge protector design tolerance limit.

4.4 Summarize of testing

(1) According to the design of single-pulse surge protector, its In (8/20μs) amplitude fail at 10 equal amplitude pulse testing.

(2) According to test results, according to surge protector design of single-pulse amplitude In(8/20μs) 0.5 calculation, can be achieved by one 10 equal amplitude pulse testing.

(3) The start of the surge protector use chip voltage is higher, under the same flow capacity, on the basis of single-pulse has higher ability of 10 pulses of tolerance

A patent for invention – Multi-pulses surge protective devices (SPD)

Abstract
The invention discloses a kind of multiple pulse surge protector, including protector ontology, body protector internal wire branch are described at least level with backup protection components of pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch. The present invention has the short circuit current power frequency directly breaking (don’t need a replace copper), energy and time to cooperate, able to withstand the real lightning, the advantage of multiple pulse impact and can pass the secondary test T2, suitable for installation in buildings, thus more effective protection of low voltage distribution circuit of electrical and electronics equipment.

Description
Multiple-pulse surge protector
Technical field

[0001] the invention relates to a surge protector, belong to prevent lightning protection equipment technical field, especially refers to a kind of multiple pulse surge protector. Technical background

[0002] Along with the advance of science and technology, the continuous development of electronic technology, all kinds of advanced electronic products are increasingly extensive application in the information industry, transportation, electric power, finance, chemical industry and other fields in the system. And with a variety of electrical components in the low-voltage distribution system intelligent step by step, the result is to choose a large amount of low pressure value, high sensitivity, high integration of electronic components. Lightning overvoltage or operating overvoltage, however, often bring fatal harm to the electronic components, makes the breadth, depth and frequency overvoltage damage are increasing. Therefore, in order to prevent lightning overvoltage and operating over-voltage damage to the electrical and electronic equipment and improve the safety and reliability of equipment system, all kinds of Surge protector has been widely used.

[0003] countries of the world’s production of surge protector SH) are carried out in accordance with the IEC/TC61643 product technology standard research and development and production and via high pressure of lightning laboratory using 10/350μs or 8/20μs test of single pulse shock wave. In the IEC61643-1:2011 and China’s national standard GB50057-2010 “code for design of the building lightning protection, surge protector of the low-voltage distribution system is divided into three test methods, and use Τ1, T2 and T3, respectively.

[0004] of the existing surge protector can be divided into general switch SPD and voltage- limiting SPD, switch SPD can withstand the direct lightning on formation of the large capacity of impact current, but there is limit high voltage, long reaction time, stream off difficult.SH) and the latest research also suggests that switch mode response time is too slow (type pressure limiting the response time of the SPD acuities were 20 ns, the response time of the switch type SPD > 200 us, average real lightning current pulse length < 180 us, 119.6 us), shortest lead to lightning current can’t have very good inhibitory effect, tend to be damaged by the lightning impulse type 2 SPD and equipment and the first-level switch SPDs doesn’t work. Although the SPD of voltage-limiting type fast response time, low voltage limit, but it can only carry a limited impact current, and requires its own backup protection can not only through a large pulse current but also in smaller power frequency current through breaking fast, and breaking time less than 5 seconds.

[0005] At present there is no international technology solutions to solve these technical problems, therefore in the IEC 61643-1:2011 in the first 8.3.5.3 regulation should adopt appropriate alternatives (simulated) instead of copper. But the use of copper instead of switch SPD or voltage-limiting SPD does not conform to the actual situation of SPD shorted, fire explosion phenomenon often occurs in actual operation. Installed in the building, on the other hand, the second level of SPD require secondary test in accordance with the provisions of GB50057-2010, T2, with 8/20μs waveform. In order to be able to pass the secondary test, usually 2 SH) using pressure limiting device is designed, the pressure limiting type SPD (T2) has a larger flow ability of 8/20μs current waveform, but by 10/350μs waveform current ability is only 1/20 of its nominal value. And according to the current national standards, international in the short circuit current test need to adopt the appropriate alternatives (simulated) instead of copper core component. Not only that, further scientific experiments and lightning protection practice shows that the thunder with a single pulse high voltage laboratory test SPD methods and the facts of the real lightning stroke at a time of multiple pulse, via high pressure of lightning lab to the test of single pulse SPD in a real tolerance and its nominal value when struck by lightning, often lead to burst into flames SPD overheating, fire accidents. Guangzhou wild lightning test base on August 12, 2008, the SPD lightning tolerance test, of course: a negative polarity not a single LEMP has eight times back, maximum current 26.4 kA, the current flows through the SPD is the maximum value to 1.64 kA, nominal current 20 kA’s SPD damage. [Shaodong Chen, Shaojie Yang on August 12, 2011 in Brazil, such as the 14th international conference on atmospheric electricity paper: Triggered from Analysis Gives New Insight into the Over Current Effects on Surge Protective Devices].To sum up, the power frequency direct breaking short circuit current, energy and time to cooperate, can withstand shock pulses is more SPD three international technical difficult problem in development and production.

[0006] As a result, the development that can tolerate more real lightning pulse impact ability, but also has direct breaking short circuit current power frequency (don’t need a copper block replacement), and the energy and time to cooperate with the secondary test SPD (T2), which is not only an urgent demand in the field of lightning protection at home and abroad, and is a historic leap of lightning protection technology.

The invention content

[0007] the purpose of this invention is to overcome the shortcomings and deficiencies of existing technologies, provide a multiple pulse surge protector, the surge protector has direct breaking short circuit current power frequency (don’t need a replace copper), energy and time to cooperate, able to withstand the real lightning, the advantage of multiple pulse impact and can pass the secondary test T2, apply to the installed in buildings, thus more effective protection of low voltage distribution circuit of electrical and electronics equipment.

[0008] in order to achieve the above purpose, the present invention according to the following technical scheme:

[0009] a surge protector, multiple pulse protector ontology, include body protector internal wire branch are described at least level with backup protection components of pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.

[0010] further body protector internal wire branch are described with multistage multiple pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor dc voltage for Utl, second-level above series branch of varistor dc voltage for Utl + Λ Un, η for 1 to 9.

[0011] further described in the body protector also have fault indicator light circuit, the fault indicator light circuit includes light and ordinary resistance series branch, the series branch connection in the first level of pulsed high current shock pressure limiting protection circuit between varistor and fuse pulse.

[0012] further described in the body protector also has a remote communication socket.

[0013] further described in the protector of the ontology zero line branch set up also have much pulsed high current shock pressure limiting protection circuit, the multiple pulse high current impact pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.[0014] a surge protector, multiple pulse includes protector of ontology, described protector setting of the body has a three-phase circuit, the circuit described in each phase of fire branch set up at least level with backup protection components of pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.

[0015] further described in each phase of the circuit wire branch set up more than multistage pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor dc voltage for Utl, second-level above series branch of varistor dc voltage for Utl + Λ Un, η for 1 to 9.

[0016] further described in the body protector also have fault indicator light circuit, the fault indicator light circuit includes light and ordinary resistance series branch, the series branch circuit connected to each of the first level of pulsed high current shock pressure limiting protection circuit between varistor and fuse pulse.

[0017] further described in the body protector also has a remote communication socket.

[0018] further described in the protector of the ontology zero line branch set up also have much pulsed high current shock pressure limiting protection circuit, the multiple pulse high current impact pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.

[0019] the invention compared with the existing technology, its beneficial effects as follows:

[0020] 1. the invention greatly improve the lightning protection ability, has the short circuit current power frequency directly breaking (don’t need a copper block replacement) ability, solve the SPD (T2) reserve when short circuit breaking itself, greatly improved the security of the SPD (T2);Has the very good energy and time to cooperate, all adopt the pressure sensitive resistance as the core component of the SPD (T2), solves the hybrid SPD not cooperate on energy and time; With multiple pulse under the impact of lightning ability, solved with single pulse test SPD cannot bear true multiple pulse lightning shock problem.

[0021] 2. the present invention is suitable for installation in buildings, thus more effective protection of low voltage distribution circuit of electrical and electronics equipment, especially important to high sensitivity of the overvoltage protection of electronic equipment, guarantee the safe and effective operation of electronic equipment system.

[0022] 3. the wide use of the present invention, will greatly reduce the thunder and lightning disasters happen; At the same time, the present invention the overall simple and reasonable structure, moderate cost, operation and maintenance is convenient, has the very good economic and social benefits.

[0023] in order to be more clear understanding of the present invention, the following will combine the appended drawings show in this paper, the concrete implementation way of the present invention.

[0024] Figure 1 is the invention implementation example 1 has the first multiple pulse current in single-phase circuit impact pressure limiting protection circuit schematic diagram of the circuit.

[0025] figure 2 is the present invention has in single-phase circuit implementation example 1 level 3 multiple pulse current shock pressure limiting protection circuit schematic diagram of the circuit.

[0026] figure 3 is the invention implementation example 2 three-phase circuit schematic diagram of the circuit.

[0027] figure 4 is the invention using state of the circuit connection diagram.
Concrete implementation way
Case 1

[0028] Implementation example 1

[0029] as shown in figure 1, the present invention described multiple pulse surge protector, it includes protector of ontology, body protector of fire within the branch level much pulsed high current shock pressure limiting protection circuit, the multiple pulse high current impact pressure limiting protection circuit consists of at least one varistor TMOVl and fuse the Mbl form series branch, a pulse pressure sensitive resistance of the dc working voltage for %.Further, described in the body protector also have fault indicator light circuit and remote communication socket, the fault indicator light circuit includes light D and ordinary R series branch, the series branch connection in the first level pulsed high current shock pressure limiting protection circuit of varistor TMOVl and pulse fuse between the Mbl. Described in the protector of the ontology of zero line branch also set how pulsed high current shock pressure limiting protection circuit, the multiple pulse high current impact pressure limiting protection circuit also includes at least a varistor and a backup protection elements form a series branch.

[0030] as shown in figure 2, the present invention described body protector of fire within the branch have a level 3 multiple pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor dc voltage for Utl, secondary series branch of varistor dc voltage for Utl + Λ U1, the third series branch of varistor dc voltage to the Ud + AUy other structure mode and the same as shown in figure 1.

[0031] the experiment results show that the present invention adopted by large flow capacity and has small power frequency pulse points off the pulse of ability to fuse (MB) and metal zinc oxide varistor (MOV), in accordance with discrete parameter control technology (discrete parameter control technology is to point to in the same products, using more than one discrete parameter is larger the core components of coordination and control of various device parameters, together to achieve one or more design parameters) series of graded breaking technology (hierarchical breaking technology refers to the composition SPD every branch of backup protection device of the circuit in short circuit, the power frequency can carry on the breaking step by step according to design requirements, make SPD off the power supply circuit, so as to improve the security of use SPD, make the fuse when short circuit power frequency pulse quick disconnect have make low voltage power distribution line is not affected by SPD short-circuit backup protection function, realized in power frequency when the short circuit test don’t need a copper piece instead of MOV power frequency directly breaking short circuit current; Adopted positive feedback all use with heat MOV and carried out in accordance with the discrete parameter control technology of odd-even matching technology (odd-even matching technology refers to the total number of branch of the SPD circuit is odd or even number, need to be distributed parameter matching technology), overcame the SPD (T2) the switch and pressure limiting device mix design, its energy and time to cooperate with can’t meet the defect of inhibition of lightning impulse, implementation of energy and time to cooperate; Adopted multilevel MOV micro gauge equivalence distribution parameters of the parallel balance technology parameters, make SPD when by lightning impulse, every parallel branch of MOV can be balanced by lightning impulse current, so as to realize the true lightning SPD is under multiple pulse impact ability.

Case 2 [0032][0033] as shown in figure 3, the present invention described multiple pulse surge protector, including protector ontology, described protector setting of the body has a three-phase circuit, wire of each circuit branch set up more than triple pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor dc voltage for Utl, pressure sensitive resistance of secondary series branch of the dc working voltage U0 + Δ U1, the third series branch pressure sensitive resistance of the dc working voltage U0 + Δ U2.Other structural mode and implementation example 1 basic same.

[0034] as shown in figure 4, when using, just put the multiple pulse surge protector more than the first level of pulsed high current shock pressure limiting protection circuit at the input wire connected to the electric wire of low voltage distribution circuit; The first grade eta more pulsed high current shock pressure limiting protection circuit the output power and low voltage distribution of ground line of the ground wire, can complete the installation of the surge protector, simple, convenient and practical security.

[0035], the present invention is not limited to the above implementation way of the invention if any changes or variant (such as the appearance of the structure on the box or module type; Through traffic In the size of the form of single phase or three phase supply various protected mode) is not from the spirit and scope of the present invention, if those changes and variant fall within the scope of the present invention claim and equivalent technology, the present invention also intent including these changes and forms.

Claims (10)

  1. A surge protector, multiple pulse includes protector of ontology, whose character is: the body protector internal wire branch are described at least level with backup protection components of pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.
  2. According to claim 1 multiple pulse surge protector, whose character is: the body protector internal wire branch are described with multistage multiple pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor of the dc working voltage for Utl, second-level above the varistor series branch of the dc working voltage U0 + Λ Un, η for 1 to 9.
  3. According to claim 2 multiple pulse surge protector, whose character is: the body protector also have stated failure indicator circuit, the fault indicator light circuit includes light and ordinary resistance series branch, the series branch connection in the first level pulsed high current shock pressure limiting protection circuit between varistor and pulse of the fuse.
  4. According to claim 1 multiple pulse surge protector, whose character is: the body protector also are described with remote communication socket.
  5. According to claim 1 multiple pulse surge protector, whose character is: the zero line branch of protector ontology is also set up at least more than primary pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.
  6. A surge protector, multiple pulse includes protector of ontology, described protector setting of the body has a three-phase circuit, whose character is: each phase of the circuit described in wire branch set up at least level with backup protection components of pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.
  7. According to claim 6 multiple pulse surge protector, whose character is: each phase of the circuit described in wire branch set up more than multistage pulse current shock pressure limiting protection circuit, each level of multiple pulse current shock pressure limiting protection circuit consists of at least one varistor and fuse to form a pulse series branch, one of the first series branch varistor of the dc working voltage for Utl, second-level above the varistor series branch of the dc working voltage U0 + Λ Un, η for 1 to 9.
  8. According to claim 7 multiple pulse surge protector, whose character is: the body protector also described a fault indicator light circuit, the fault indicator light circuit includes light and ordinary resistance series branch, the series branch circuit connected to each of the first level of pulsed high current shock pressure limiting protection circuit between varistor and fuse pulse.
  9. According to claim 6 multiple pulse surge protector, whose character is: the body protector also are described with remote communication socket.

More than 10. According to claim 6 pulse surge protector, whose character is: the zero line branch of protector ontology is also set up at least more than primary pulsed high current shock pressure limiting protection circuit, among them, each level more pulsed high current shock pressure limiting protection circuit consists of at least a varistor and a backup protection elements form a series branch.

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