CN103326337A - Safe and reliable current transformer protection device - Google Patents
Safe and reliable current transformer protection device Download PDFInfo
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- CN103326337A CN103326337A CN2012100720643A CN201210072064A CN103326337A CN 103326337 A CN103326337 A CN 103326337A CN 2012100720643 A CN2012100720643 A CN 2012100720643A CN 201210072064 A CN201210072064 A CN 201210072064A CN 103326337 A CN103326337 A CN 103326337A
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Abstract
The invention relates to a current transformer, and particularly relates to a safe and reliable current transformer protection device. The safe and reliable current transformer protection device comprises duel-stage thunder-resistant unit and is characterized by further comprising a sampling unit, a signal processing unit, an implement unit, an alarm unit and a reset button. The sampling unit is used for sampling an earth leakage current of the dual-stage thunder-resistant unit, and transforming the current into a voltage signal; the signal processing unit is used for processing the collected voltage signal; the implement unit acts according to the signal outputted by the signal processing unit; the alarm unit outputs an alarm signal according to the action of the implement unit; and the reset button is used for performing resetting operation after the action of the implement unit. The safe and reliable current transformer protection device is not only capable of greatly reducing high current withstood by the relay and improving service lifetime and reliability of the relay, but also capable of reaching an effect of preventing secondary devices from withstanding a momentary high current impulse.
Description
Technical field
The present invention relates to current transformer, relate in particular to a kind of protector of current mutual inductor.
Background technology
In electric power system, current transformer (CT) is used measurement and the control of primary current, and the Current Transformer Secondary side is in approximate short-circuit condition during normal operation, and output voltage is very low.Secondary winding open circuit or a winding flow through abnormal current (such as lightning current, resonance overcurrent, capacitor charging electric current, inductance starting current etc.) if be in operation, and all can produce at secondary side the overvoltage of thousands of volts even volts up to ten thousand.This not only works the mischief to electrical secondary system insulation, also can make the too drastic and scaling loss of current transformer, even the life security that jeopardizes the operations staff.
Have in the market a few money current transformer protectors; it mainly is that mode by the relay short circuit prevents the current transformer open circuit; relay is subjected to the restriction of electric current; relay generation over-current phenomenon avoidance in use all appears; cause protective device to break down; the operation troubles that increases electric power rate is obstructed so promote always.
Summary of the invention
For the deficiency that prior art exists, the invention provides a kind ofly be swift in response, fail safe is good, reliability is high protector of current mutual inductor.
Technical scheme of the present invention is as follows:
A kind of safe and reliable protector of current mutual inductor comprises the two-stage lightning protection unit, it is characterized in that: it also comprises sampling unit, signal processing unit, performance element, alarm unit and reset button, wherein:
Sampling unit is used for the over the ground leakage current of two-stage lightning protection unit is sampled, and is converted into voltage signal;
Signal processing unit is used for the voltage signal that gathers is processed;
Performance element is according to the signalizing activity of signal processing unit output;
Alarm unit is according to the situation output alarm signal of performance element action;
Reset button is for move laggard horizontal reset at performance element.
As preferably, described sampling unit is selected the electric resistance partial pressure sample circuit.
As preferably, described electric resistance partial pressure sample circuit comprises three resistance and a Transient Suppression Diode.
As preferably, described signal processing unit comprises chip, electric capacity, resistance and photoelectrical coupler, and chip is processed voltage signal, and by being input to photoelectrical coupler after electric capacity and the resistance filtering.
As preferably, described photoelectrical coupler adopts the 6N136 high-speed photoelectric coupler.
As preferably, described performance element comprises electric capacity, resistance, triode and relay.
As preferably, described alarm unit comprises photoelectric alarm circuit, normal indicating circuit and signal output interface.
The design defect that the existing protector of current mutual inductor of pin of the present invention exists is improved; when large electric current (such as lightning current, resonance overcurrent, capacitor charging electric current, inductance starting current etc.) occurring on the current transformer; chip varistor, TVS pipe two-stage lightning protection action; carry out I and II over the ground moment leakage current; sampling unit carries out signals collecting in electric current moment of releasing over the ground; then process by signal processing unit; the actuating of relay in the control performance element forms short circuit.The advantage of design is like this: be complementary by chip varistor and TVS pipe, the 5KA-20KA immediate current of can releasing over the ground, operate time is less than 25ns, so not only can greatly reduce relay and bear large electric current, improve useful life and the reliability of relay, can avoid secondary device to be subject to the purpose (such as lightning current) that immediate current impacts simultaneously.Can avoid like this current transformer and instrument high-pressure phenomena to occur, prevent from jeopardizing safety in production.
In addition, be provided with alarm unit among the present invention, when the actuating of relay, lumination of light emitting diode in the alarm unit, prompt system is unusual, also is provided with signal output port in the alarm unit, shows, processes or control in order to will be uploaded to for information about relevant devices.
Description of drawings
Fig. 1 is block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of the preferred embodiment of the present invention.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the present invention includes following part: two-stage lightning protection unit, sampling unit, signal processing unit, performance element, alarm unit, reset button.
When being subject to large electric current (such as lightning current, resonance overcurrent, capacitor charging electric current, inductance starting current etc.), impacts by current transformer, when secondary side forms the high voltage input, two-stage lightning protection unit snap action, leakage current over the ground, sampling unit gathers voltage signal by divider resistance, process through signal processing unit, the control alarm unit is reported to the police, and resets by reset button behind Failure elimination again again.
As shown in Figure 2, P1 is the input interface of current transformer, and interface P1 two ends parallel connection consists of the two-stage lightning protection unit by piezo-resistance, Transient Suppression Diode.When the P1 interface has high voltage input moment, the piezo-resistance in the two-stage lightning protection unit and Transient Suppression Diode be rapidly action successively, i.e. leakage current over the ground.
Sampling unit is made of resistance R 1, resistance R 2, resistance R 3 and Transient Suppression Diode DZ2 parallel connection.When two-stage lightning protection unit over the ground during leakage current, the upper dividing potential drop that produces of resistance R 1, resistance R 2, resistance R 3 or Transient Suppression Diode DZ2 forms voltage signal and is input to signal processing unit;
Signal processing unit adopts the W08 chip that voltage signal is processed, and by being input to the 6N136 high-speed photoelectric coupler after electric capacity and the resistance filtering.The 6N136 high-speed photoelectric coupler is the photoelectric coupled device with good characteristic that Toshiba Corp produces, encapsulation height infraluminescence pipe and phototriode in this model have that volume is little, life-span length, strong interference immunity, isolation voltage are high, high-speed, and characteristics such as TTL logic level compatibility.
Input at the 6N136 high-speed photoelectric coupler is parallel with a protective circuit, and this protective circuit is made of four diodes.
Performance element mainly is made of electric capacity, resistance, triode and relay, the pin 5 of high-speed photoelectric coupler connects the collector electrode of triode Q1, pin 6 connects the base stage of triode Q1 by resistance R 8, be parallel with a capacitor C 2 between pin 5 and the pin 6, the emitter of triode Q1 is succeeded electrical equipment J1 by reset button S2, and the emitter at triode Q1 also is connected to relay J 2 in addition.When the photoelectrical coupler in the signal processing unit sent signal, performance element relay J 1 and relay J 2 were moved rapidly, formed short circuit.
Described alarm unit comprises photoelectric alarm circuit, normal indicating circuit, signal output interface P2, signal output interface P3.Photoelectric alarm circuit is made of the contact of light-emitting diode DL1, resistance R 9 and relay J 1, and normal indicating circuit is made of another contact of light-emitting diode DL2, resistance R 10 and relay J 1.When operation of current transformers is normal, when not being subject to over-current shock, relay J 1 is failure to actuate, and light-emitting diode DL2 lamp is bright, and light-emitting diode DL1 lamp goes out, and expression is normal; When being the heavy current impact such as lightning current when current transformer, relay J 1 action, light-emitting diode DL2 lamp goes out, and light-emitting diode DL1 lamp is bright, and expression is unusual.
Also be provided with signal output interface P2 and signal output interface P3 in the alarm unit, in order to will be uploaded to for information about relevant devices.
Behind Failure elimination, the attendant can press reset button S2 by hand, and protector of current mutual inductor is resetted, and protective device enters the wait guard mode, and light-emitting diode DL1 lamp goes out, and light-emitting diode DL2 lamp is bright, represents working properly.
In addition, the present invention also is provided with testing button S1, is used for device is tested.
Compare with existing like product, design concept of the present invention is different, operation principle is different, and circuit and performance are different.This product has the defencive function of autoprotection and successor devices, can be up to 20-40KA (8/20us lightning wave) conveyance capacity; The actuating of relay is to move after the sampling during earial drainage over the ground in bypass in addition, has greatly improved the conveyance capacity of relay, increases stability and the life-span of relay.Enhance productivity like this, improve fail safe, reduce labour intensity, operating maintenance cost.
The present invention has passed through 5000 20KV and the 5KA analog current is tested, conclusion (of pressure testing) be protection be swift in motion, reliably, stable performance.
Through Datang gold Zhushan County power plant on-line operation, stable performance is swift in motion, reliably since 2010.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates purpose of the present invention, and be not as limitation of the invention, as long as in essential scope of the present invention, all will drop in the scope of claim of the present invention variation, the modification of the above embodiment.
Claims (7)
1. a safe and reliable protector of current mutual inductor comprises the two-stage lightning protection unit, it is characterized in that: it also comprises sampling unit, signal processing unit, performance element, alarm unit and reset button, wherein:
Sampling unit is used for the over the ground leakage current of two-stage lightning protection unit is sampled, and is converted into voltage signal;
Signal processing unit is used for the voltage signal that gathers is processed;
Performance element is according to the signalizing activity of signal processing unit output;
Alarm unit is according to the situation output alarm signal of performance element action;
Reset button is for move laggard horizontal reset at performance element.
2. a kind of safe and reliable protector of current mutual inductor according to claim 1, it is characterized in that: described sampling unit is selected the electric resistance partial pressure sample circuit.
3. a kind of safe and reliable protector of current mutual inductor according to claim 2, it is characterized in that: described electric resistance partial pressure sample circuit comprises three resistance and a Transient Suppression Diode.
4. a kind of safe and reliable protector of current mutual inductor according to claim 1; it is characterized in that: described signal processing unit comprises chip, electric capacity, resistance and photoelectrical coupler; chip is processed voltage signal, and by being input to photoelectrical coupler after electric capacity and the resistance filtering.
5. a kind of safe and reliable protector of current mutual inductor according to claim 4, it is characterized in that: described photoelectrical coupler is the 6N136 high-speed photoelectric coupler.
6. a kind of safe and reliable protector of current mutual inductor according to claim 1, it is characterized in that: described performance element comprises electric capacity, resistance, triode and relay.
7. a kind of safe and reliable protector of current mutual inductor according to claim 1 is characterized in that: described alarm unit comprises photoelectric alarm circuit, normal indicating circuit and signal output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100720643A CN103326337A (en) | 2012-03-19 | 2012-03-19 | Safe and reliable current transformer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100720643A CN103326337A (en) | 2012-03-19 | 2012-03-19 | Safe and reliable current transformer protection device |
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| Publication Number | Publication Date |
|---|---|
| CN103326337A true CN103326337A (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100720643A Pending CN103326337A (en) | 2012-03-19 | 2012-03-19 | Safe and reliable current transformer protection device |
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| CN (1) | CN103326337A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449655A (en) * | 2014-09-03 | 2016-03-30 | 国网河南省电力公司平顶山供电公司 | Current transformer secondary open circuit protection method and device |
| CN106849044A (en) * | 2017-02-14 | 2017-06-13 | 安徽凯川电力保护设备有限公司 | A kind of invariable power overvoltage intelligence short-circuit protector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07154917A (en) * | 1993-11-26 | 1995-06-16 | Nissin Electric Co Ltd | Antilimitation time overcurrent relay |
| CN2539274Y (en) * | 2001-12-12 | 2003-03-05 | 南京因泰莱电器股份有限公司 | Integrated digital relay |
| CN201636674U (en) * | 2009-06-10 | 2010-11-17 | 黄爱国 | Lightning protection led street lamp |
| CN201985520U (en) * | 2011-02-01 | 2011-09-21 | 中兴通讯股份有限公司 | Alternating current line lightning protection device |
| CN202488124U (en) * | 2012-03-19 | 2012-10-10 | 长沙润迅通信设备有限公司 | Safe and reliable current transformer protection device |
-
2012
- 2012-03-19 CN CN2012100720643A patent/CN103326337A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07154917A (en) * | 1993-11-26 | 1995-06-16 | Nissin Electric Co Ltd | Antilimitation time overcurrent relay |
| CN2539274Y (en) * | 2001-12-12 | 2003-03-05 | 南京因泰莱电器股份有限公司 | Integrated digital relay |
| CN201636674U (en) * | 2009-06-10 | 2010-11-17 | 黄爱国 | Lightning protection led street lamp |
| CN201985520U (en) * | 2011-02-01 | 2011-09-21 | 中兴通讯股份有限公司 | Alternating current line lightning protection device |
| CN202488124U (en) * | 2012-03-19 | 2012-10-10 | 长沙润迅通信设备有限公司 | Safe and reliable current transformer protection device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449655A (en) * | 2014-09-03 | 2016-03-30 | 国网河南省电力公司平顶山供电公司 | Current transformer secondary open circuit protection method and device |
| CN105449655B (en) * | 2014-09-03 | 2018-05-22 | 国网河南省电力公司平顶山供电公司 | A kind of Current Transformer Secondary open-circuit-protection method and device |
| CN106849044A (en) * | 2017-02-14 | 2017-06-13 | 安徽凯川电力保护设备有限公司 | A kind of invariable power overvoltage intelligence short-circuit protector |
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Application publication date: 20130925 |