CN103457237A - Damage warning and protecting method and device for high-energy voltage dependent resistor overvoltage protector - Google Patents

Damage warning and protecting method and device for high-energy voltage dependent resistor overvoltage protector Download PDF

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Publication number
CN103457237A
CN103457237A CN2013103605571A CN201310360557A CN103457237A CN 103457237 A CN103457237 A CN 103457237A CN 2013103605571 A CN2013103605571 A CN 2013103605571A CN 201310360557 A CN201310360557 A CN 201310360557A CN 103457237 A CN103457237 A CN 103457237A
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CN
China
Prior art keywords
high energy
protection device
overvoltage protection
resistance overvoltage
energy piezo
Prior art date
Application number
CN2013103605571A
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Chinese (zh)
Inventor
孙丹峰
程玉正
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苏州市电通电力电子有限公司
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Priority to CN2013103605571A priority Critical patent/CN103457237A/en
Publication of CN103457237A publication Critical patent/CN103457237A/en

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Abstract

The invention discloses a damage warning and protecting method and device for a high-energy voltage dependent resistor overvoltage protector. The damage warning and protecting method comprises the steps that the working state of the high-energy voltage dependent resistor overvoltage protector is monitored on line, and a current sensor LH collects current signals; interference pulses are filtered through a discriminator circuit, nonperiodic overvoltage surge pulses are sent to be counted, and the periodic leakage current pulse peak Ip is sent into an amplitude separation circuit; when Ip is greater than or equal to an alert current Ij, a warning program is started, and when Ip is greater than or equal to an action current Id, a temperature signal is combined, a certain time delay passes, synthetic judgment is made to decide whether releasing is conducted or not. The damage warning and protecting device is composed of the current sensor LH, a temperature sensor LT, the pulse discriminator circuit, the amplitude separation circuit, a control unit MP, a counting module, the warning program and a releasing switch. The method and device are simple, and can effectively avoid expanded failures caused when the high-energy voltage dependent resistor overvoltage protector is damaged.

Description

The damage early warning of high energy piezo-resistance overvoltage protection device and guard method and device

Technical field:

The present invention relates to a kind of damage early warning and guard method and device of high energy piezo-resistance overvoltage protection device.

Background technology:

At present, the user in use all seals in fuse FU in high energy piezo-resistance overvoltage protection device (HEHEMOV) loop:

What FU was used is fast acting fuse (melt is the fine silver material).When strong overvoltage pulse is passed through, HEHEMOV can be large by intensity, the pulse current that the time is short, and fast acting fuse is because of its I 2t is little but can fuse, and causes normally over-voltage suppression of HEMOV;

What FU was used is common fuse.It is improper at the HEMOV pressure sensitive voltage, to select, and when the HEHEMOV performance change causes the situation such as pressure sensitive voltage reduction, can have for a long time little electric current to flow through HEMOV, and this can make the HEMOV heating damage, and fuse can not fuse.

Visible, it is undesirable using fuse protection HEHEMOV.

Summary of the invention:

The object of the invention is to overcome the deficiencies in the prior art, a kind of damage early warning and guard method and device of high energy piezo-resistance overvoltage protection device is provided.

In order to solve the existing problem of background technology, the present invention by the following technical solutions:

A kind of damage early warning and guard method of high energy piezo-resistance overvoltage protection device, it comprises the steps:

The operating state of on-line monitoring high energy piezo-resistance overvoltage protection device, gather current signal by current sensor LH;

Through discriminator circuit, by the disturbing pulse filtering, acyclic over-voltage surge pulse is sent to counting, by periodic leakage current peak value of pulse I psend into range separation circuit;

Work as I p>=warning electric current I jthe time, enter alert program, work as I p>=operating current I dthe time, again through certain time-delay, make comprehensive judgement in conjunction with temperature signal, to determine whether thread off.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device, when high energy piezo-resistance overvoltage protection device is operated in work frequency circuit, giving and damaging signal is a power frequency period pulse, accordingly by I jwith other aperiodicity pulses difference, come, thus extract high energy piezo-resistance overvoltage protection device give the damage signal.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device, define the warning electric current I in conjunction with electric parameter, structural parameters jwith operating current I dvalue.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device add temperature sensor in high energy piezo-resistance overvoltage protection device, wherein: by the temperature signal U detected tsend into single-chip microcomputer and participate in judgement, detecting I j, I dthe time, in conjunction with U tthe value judgement, obtain guard signal.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device; in the work of high energy piezo-resistance overvoltage protection device; convection current is crossed the over-voltage surge pulse of high energy piezo-resistance overvoltage protection device and is counted; and show with charactron; according to the data of record, judge whether higher pressure sensitive voltage is selected.

A kind of damage early warning and protective device of high energy piezo-resistance overvoltage protection device, it is by current sensor LH, temperature sensor LT, pulse discriminator circuit, range separation circuit, control unit MP, counting module, alert program, and the dropout switch forms.

Wherein, damage early warning and the protective device of described a kind of high energy piezo-resistance overvoltage protection device, the power supply of its work is directly taken from the two ends of high energy piezo-resistance overvoltage protection device.

The present invention contrasts prior art following beneficial effect: this method and device are simple, can effectively take precautions against because high energy piezo-resistance overvoltage protection device self damages and cause that fault enlarges.

The accompanying drawing explanation:

Fig. 1 is apparatus structure of the present invention and method schematic diagram.

Fig. 2 is piezo-resistance work of the present invention loop.

Fig. 3 is control loop circuit diagram of the present invention

The fundamental diagram that Fig. 4 is the invention of this reality.

Embodiment:

In practice, except the only a few type selecting is improper, cause damage, because surge voltage causes almost not having of direct damage.Through long-time, use, the characteristic of HEHEMOV can change, and its characteristic feature is that pressure sensitive voltage reduces, and leakage current increases, and this lasting leakage current aggravates again heating, and so circulation, cause damaging fully.If reasonably define the limiting value of leakage current and the leakage current signal correctly can be extracted, just can realize damage early warning and protection to HEHEMOV.

In Fig. 1, a kind of damage early warning and guard method of high energy piezo-resistance overvoltage protection device, it comprises the steps:

The operating state of on-line monitoring high energy piezo-resistance overvoltage protection device, gather current signal by current sensor LH;

Through discriminator circuit, by the disturbing pulse filtering, acyclic over-voltage surge pulse is sent to counting, by periodic leakage current peak value of pulse I psend into range separation circuit;

Work as I p>=warning electric current I jthe time, enter alert program, work as I p>=operating current I dthe time, again through certain time-delay, make comprehensive judgement in conjunction with temperature signal, to determine whether thread off.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device, when high energy piezo-resistance overvoltage protection device is operated in work frequency circuit, giving and damaging signal is a power frequency period pulse, accordingly by I jwith other aperiodicity pulses difference, come, thus extract high energy piezo-resistance overvoltage protection device give the damage signal.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device, define the warning electric current I in conjunction with electric parameter, structural parameters jwith operating current I dvalue.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device add temperature sensor in high energy piezo-resistance overvoltage protection device, wherein: by the temperature signal U detected tsend into single-chip microcomputer and participate in judgement, detecting I j, I dthe time, in conjunction with U tthe value judgement, obtain guard signal.

Wherein, damage early warning and the guard method of described a kind of high energy piezo-resistance overvoltage protection device; in the work of high energy piezo-resistance overvoltage protection device; convection current is crossed the over-voltage surge pulse of high energy piezo-resistance overvoltage protection device and is counted; and show with charactron; according to the data of record, judge whether higher pressure sensitive voltage is selected.

A kind of damage early warning and protective device of high energy piezo-resistance overvoltage protection device, it is by current sensor LH, temperature sensor LT, pulse discriminator circuit, range separation circuit, control unit MP, counting module, alert program, and the dropout switch forms.

Wherein, damage early warning and the protective device of described a kind of high energy piezo-resistance overvoltage protection device, the power supply of its work is directly taken from the two ends of high energy piezo-resistance overvoltage protection device.

In Fig. 2; serial connection current sensor LH and dropout K switch in the work loop of HEMOV, attaching temperature sensor LT on the body of HEMOV, then from the ends A .B power taking source of HEMOV; send into electronic circuit and implement the AC/DC conversion, become the working power of protection system.All signals, processed through the control unit MP of electronic circuit and single-chip microcomputer composition, and MP is presented at the over-voltage surge pulse counting on the LED charactron and controls the dropout K switch on request.

In Fig. 3, obtain alternating voltage through both ends of power, through C 1step-down, rectification is by C 2filtering and dividing potential drop, then the switching regulator voltage-regulating circuit formed through triode Q, operational amplifier IC, export needed low-voltage DC, for control loop work.

In Fig. 4, characteristic curve becomes dotted line position from solid line position, and under same applied voltage u, electric current increases to i2 from i1.This lasting leakage current aggravates again heating, so circulation.This leakage current can increase to a lasting little electric current I j, we are referred to as to guard against electric current, and renewing reforwarding row I can strengthen again, and heating aggravates again, and the overvoltage that at this moment has another one arteries and veins, just can damage fully.Accordingly, the operating state of we just necessary on-line monitoring HEHEMOV, when the warning electric current I occurring jthe time, send early warning signal.When this electric current further rises again, arrive operating current I dthe time, the judgement of binding time, temperature just can be disconnected from the circuit it before HEHEMOV not yet damages, and system can not trip, and effectively Accident prevention enlarges again.

Claims (7)

1. damage early warning and the guard method of a high energy piezo-resistance overvoltage protection device, is characterized in that, it comprises the steps:
The operating state of on-line monitoring high energy piezo-resistance overvoltage protection device, gather current signal by current sensor LH;
Through discriminator circuit, by the disturbing pulse filtering, acyclic over-voltage surge pulse is sent to counting, by periodic leakage current peak value of pulse I psend into range separation circuit;
Work as I p>=warning electric current I jthe time, enter alert program, work as I p>=operating current I dthe time, again through certain time-delay, make comprehensive judgement in conjunction with temperature signal, to determine whether thread off.
2. damage early warning and the guard method of a kind of high energy piezo-resistance overvoltage protection device according to claim 1; it is characterized in that; when high energy piezo-resistance overvoltage protection device is operated in work frequency circuit, giving and damaging signal is a power frequency period pulse, accordingly by I jwith other aperiodicity pulses difference, come, thus extract high energy piezo-resistance overvoltage protection device give the damage signal.
3. damage early warning and the guard method of a kind of high energy piezo-resistance overvoltage protection device according to claim 1, is characterized in that, in conjunction with electric parameter, structural parameters, defines the warning electric current I jwith operating current I dvalue.
4. damage early warning and the guard method of a kind of high energy piezo-resistance overvoltage protection device according to claim 1, is characterized in that, in high energy piezo-resistance overvoltage protection device, adds temperature sensor,
Wherein: by the temperature signal U detected tsend into single-chip microcomputer and participate in judgement, detecting I j, I dthe time, in conjunction with U tthe value judgement, obtain guard signal.
5. damage early warning and the guard method of a kind of high energy piezo-resistance overvoltage protection device according to claim 1; it is characterized in that; in the work of high energy piezo-resistance overvoltage protection device; convection current is crossed the over-voltage surge pulse of high energy piezo-resistance and is counted; and show with charactron; according to the data of record, judge whether higher pressure sensitive voltage is selected.
6. damage early warning and the protective device of a high energy piezo-resistance overvoltage protection device; it is characterized in that; it is by current sensor LH, temperature sensor LT, pulse discriminator circuit, range separation circuit, control unit MP, counting module, alert program, and the dropout switch forms.
7. damage early warning and the protective device of a kind of high energy piezo-resistance overvoltage protection device according to claim 6, is characterized in that, the power supply of its work is directly taken from the two ends of high energy piezo-resistance overvoltage protection device.
CN2013103605571A 2013-08-16 2013-08-16 Damage warning and protecting method and device for high-energy voltage dependent resistor overvoltage protector CN103457237A (en)

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CN2013103605571A CN103457237A (en) 2013-08-16 2013-08-16 Damage warning and protecting method and device for high-energy voltage dependent resistor overvoltage protector

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CN2013103605571A CN103457237A (en) 2013-08-16 2013-08-16 Damage warning and protecting method and device for high-energy voltage dependent resistor overvoltage protector

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143822A (en) * 2014-08-19 2014-11-12 四川三普科技有限公司 Electromagnetic pulse protecting device
CN106356805A (en) * 2016-08-22 2017-01-25 陈宜中 Method for endowing shortcircuit burning self-cut-off device with air switch hot stripping function

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CN102664384A (en) * 2012-05-02 2012-09-12 胡勇坚 Intelligent tripping method for power supply lightning arrester
CN102841234A (en) * 2012-09-18 2012-12-26 辽宁省电力有限公司电力科学研究院 Non-residual voltage monitoring device for gapless metal oxide lightning arresters and measurement method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02108981A (en) * 1988-10-18 1990-04-20 Meidensha Corp Automatic monitor device for gapless arrester
CN1811477A (en) * 2006-02-15 2006-08-02 上海涌能电力科技发展有限公司 Lightning arrester leakage current and action frequency real-time monitoring system
CN101102041A (en) * 2006-07-07 2008-01-09 王勇 Surge protector with automatic monitoring function
CN201311488Y (en) * 2009-03-02 2009-09-16 南京卓实电气有限责任公司 Check meter of arrester leakage current and action recorder
CN201373895Y (en) * 2009-03-09 2009-12-30 浙江纪元电气集团有限公司 Online monitoring device of zinc oxide arrester (MOA)
CN101581748A (en) * 2009-06-24 2009-11-18 西安工程大学 Zinc oxide arrester on-line monitoring system
CN201926695U (en) * 2010-12-15 2011-08-10 南京德闰电气有限公司 Arrester action current amplitude monitor
CN102664384A (en) * 2012-05-02 2012-09-12 胡勇坚 Intelligent tripping method for power supply lightning arrester
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143822A (en) * 2014-08-19 2014-11-12 四川三普科技有限公司 Electromagnetic pulse protecting device
CN104143822B (en) * 2014-08-19 2017-05-31 四川三普科技有限公司 Spark gap device
CN106356805A (en) * 2016-08-22 2017-01-25 陈宜中 Method for endowing shortcircuit burning self-cut-off device with air switch hot stripping function

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