CN201562027U - Composite current transformer and on-line detection device for lightning arrester - Google Patents
Composite current transformer and on-line detection device for lightning arrester Download PDFInfo
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- CN201562027U CN201562027U CN2009201814590U CN200920181459U CN201562027U CN 201562027 U CN201562027 U CN 201562027U CN 2009201814590 U CN2009201814590 U CN 2009201814590U CN 200920181459 U CN200920181459 U CN 200920181459U CN 201562027 U CN201562027 U CN 201562027U
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- current transformer
- circuit
- lightning arrester
- measuring device
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Abstract
The utility model provides a composite current transformer comprising a zero flux current sensor, wherein the zero flux current sensor is also provided with a high frequency sensor. By adopting the core-perforating mode, the composite current transformer can instantaneously capture lightning stroke time and lightning stroke frequency. Matched with the on-line detection device, the composite current transformer can monitor the total current, the resistive current and the capacitive current of the lightning arrester and record the time of ground lightning discharge of the lightning arrester as well as the discharge frequency.
Description
[technical field]
The present invention relates to a kind of online detection technique of power equipment Zinc-Oxide Arrester, be particularly related to compound current transformer and be applied in the on-Line Monitor Device of lightning arrester, be used for Leakage Current (total current), current in resistance property, capacity current, thunderbolt number of times and the thunderbolt time etc. of on-line monitoring lightning arrester.
[background technology]
Metal oxide arrester (MOA) is mainly used in lightning surge that restriction transmitted by circuit or by the internal overvoltage that operation causes, is one of important protection equipment that guarantees safe operation of power system.But because MOA bears power-frequency voltage, surge voltage for a long time, add the influence of factors such as various external environment conditions and be tending towards aging, its insulation characterisitic is destroyed, cause MOA to cause thermal runaway, even blast.For guaranteeing that lightning arrester normally plays a role, need regularly to detect the lightning arrester state and detect with the thunderbolt number of times.
And existing monitoring device major part is made up of electromagnetic mechanical counter and milliammeter meter, realizes detection and demonstration to Leakage Current by common rectifier bridge and milliammeter meter; By electric capacity and nonlinear loop coil discharge realize to the thunderbolt number of times counting.This mode is had relatively high expectations to components and parts, when thunderbolt, might produce excessive electric current valve block (or valve is aging) and protective device are burnt, and causes lightning arrester not have normal ground connection and causes the MOA explosion accident.And this mode can't write down the thunderbolt time, can't realize the analysis of lightning arrester insulation performance.
As shown in Figure 7, also having a kind of device now is to utilize single CT (current transformer, current transformer) lightning arrester is carried out the Leakage Current monitoring, be wound on the zero flux current sensor with independent coil N, cooperate the monitoring of above-mentioned mechanical type lightning stroke counter realization to lightning arrester, but this device can only be monitored the power frequency component of lightning arrester, can monitor the Leakage Current of lightning arrester in real time, can't realize that but thunderbolt catches, carries out the record of thunderbolt time and realize the monitoring of MOA catastrophic discontinuityfailure.
More than two kinds of devices all have the shortcoming that is difficult to overcome, be difficult to state estimation, fault diagnosis and thunderbolt situation record accurately to MOA.To sum up, the existing lightning arrester monitoring equipment following problem that needs to be resolved hurrily:
1, can not influence the existing earthing mode of MOA;
2, can monitor and write down lightning arrester thunderbolt time and number of times in real time;
3, requirement can realize the warning of lightning arrester catastrophic discontinuityfailure;
4, can realize seamless link with present Transformer Substation Online Monitoring System, can pass through the monitoring of total current, current in resistance property and the capacity current of monitoring lightning arrester, carry out fault analysis, diagnosis, thereby realize intelligent control, the reliability of raising equipment by system.
[summary of the invention]
One of the technical problem to be solved in the present invention is to provide a kind of compound current transformer, has adopted recombination current mutual inductor punching sampling mode, can instantaneously catch the thunderbolt moment and thunderbolt number of times.
Two of the technical problem to be solved in the present invention, be to provide a kind of on-line measuring device, this device is connected in the arrester ground loop, can monitor total current, current in resistance property, the capacity current of lightning arrester in real time and write down the time and the discharge time of lightning arrester thunderbolt discharging time.
One of the technical problem to be solved in the present invention is achieved in that a kind of compound current transformer, comprises one zero flux current sensors, also is provided with a high frequency sensors on the described zero flux current sensor.
This compound current transformer is that permalloy and iron sample body are overlapped into a superimposed magnetic core, will respectively the coil of described zero flux current sensor and the coil winding of high frequency sensors be encapsulated after on this superimposed magnetic core again.
Be provided with multilayer screen between described permalloy and the iron sample body, this multilayer screen comprises copper and the pure iron that sets gradually at least from outside to inside.
Described high frequency sensors is all identical with size with original zero flux current sensor shape.
Two of the technical problem to be solved in the present invention is achieved in that a kind of on-line measuring device of lightning arrester, comprise above-mentioned any compound current transformer, also comprise a reference power source current transformer, a signal conditioning circuit, A/D conversion sample circuit, a digital signal processor, a programmable logic device (PLD), and a capture circuit; Described compound current transformer and reference power source current transformer all are connected to signal conditioning circuit; Described signal conditioning circuit, A/D conversion sample circuit, digital signal processor, and described programmable logic device (PLD) connects in turn; Described programmable logic device (PLD) connects described A/D conversion sample circuit again; Described compound current transformer connects described digital signal processor by described capture circuit again.
This on-line measuring device also comprises a LED display lamp that is connected with described digital signal processor.
It is the chip of EPM3128 that described programmable logic device (PLD) adopts model, this chip internal programming is finished extending out the chip selection logic of RAM, modulus conversion chip, the fetch equipment address code, the mode of operation of distributing the LED display lamp, and will deliver on the DSP data bus after the sampled data buffering.
Described digital signal processor adopts the FIR filtering of windowing, uses fast fourier transform to extract the fundamental phase and the fundametal compoment peak value of the relative bus of Leakage Current signal at last.
Described signal conditioning circuit comprises in-phase amplifier circuit, filtering circuit and the voltage follower circuit that connects successively.
This on-line measuring device also connects a PC, and this PC is connected to the described digital signal processor of stating.
The invention has the advantages that:
1, record thunder-strike current that can be real-time and thunderbolt time constantly, and show more thunderbolt number of times, and data message can not lost after having power down;
2, utilize totally digital circuit control, avoided the error that causes because of factors such as device aging, temperature;
3, device structure is simple, and dependable performance and each are measured item accurately;
4, can link to each other with remote controllers by bus, remote controllers can get access to the relevant information of lightning arrester easily;
5, fault self-adapting recognition system, when the communication bus of lightning arrester and remote controllers breaks down, but equipment automatic fault detection and send warning information.
[description of drawings]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structural representation of the compound current transformer of the present invention.
Fig. 2 is the theory structure block diagram of the on-line measuring device of lightning arrester of the present invention.
Fig. 3 is the connection diagram of the in-phase amplifier circuit in the signal conditioning circuit of the present invention.
Fig. 4 is the connection diagram of the filtering circuit in the signal conditioning circuit of the present invention.
Fig. 5 is the voltage follower circuit connection diagram in the signal conditioning circuit of the present invention.
Fig. 6 is the connection diagram of capture circuit of the present invention.
Fig. 7 is the structural representation of existing a kind of current transformer.
[embodiment]
See also shown in Figure 1ly, compound CT of the present invention comprises one zero flux current sensors, has mainly utilized on the basis of zero flux current sensor, set up one with zero flux current sensor shape and size all can be identical high frequency sensors.Specifically be that permalloy and iron sample body are overlapped into a superimposed magnetic core, encapsulate after again will be respectively being wound on the coil N2 of the coil N1 of described zero flux current sensor and high frequency sensors on this superimposed magnetic core, form combined type trans, can gather the power frequency component and the high-frequency signal of lightning arrester jointly.
Described zero flux current sensor is mainly used in the power frequency component of monitoring lightning arrester, can monitor the Leakage Current of lightning arrester microampere order in real time.Described high frequency sensors is mainly used in quick reflection thunderbolt high-frequency signal, because when lightning arrester is subjected to be struck by lightning, the lightning wave signal is a high-frequency signal, and this signal duration is the microsecond rank often, therefore will use high frequency sensors for the instantaneous thunderbolt moment and the thunderbolt number of times of catching this moment.
Compound CT of the present invention also adopts unique shielding measure, as as described in be provided with multilayer screen between permalloy and the iron sample body, this multilayer screen comprises copper and the pure iron that sets gradually at least from outside to inside, and for magnetic interference, this multilayer screen effect is more much bigger than individual layer.
Please refer to Fig. 2, is the theory structure block diagram of the on-line measuring device of lightning arrester of the present invention.The on-line measuring device of lightning arrester of the present invention, comprise a compound current transformer, a reference power source current transformer, a signal conditioning circuit, A/D conversion sample circuit, a digital signal processor, a programmable logic device (PLD), a capture circuit, and a LED display lamp; Described compound current transformer and reference power source current transformer all are connected to signal conditioning circuit; Described signal conditioning circuit, A/D conversion sample circuit, digital signal processor, and described programmable logic device (PLD) connects in turn; Described programmable logic device (PLD) connects described A/D conversion sample circuit again; Described compound current transformer connects described digital signal processor by described capture circuit again; Described digital signal processor also is connected with the LED display lamp and a PC connects.
Its principle of work is: system acquisition is to the signal through described compound CT sensor and reference power source CT output, nurse one's health the sampling of laggard A/D conversion sample circuit through described signal conditioning circuit, carry out digital filtering by digital signal processor, use fast fourier transform to extract the fundamental phase and the fundametal compoment peak value of the relative bus of Leakage Current signal at last.It is the chip of EPM3128 that described programmable logic device (PLD) adopts model, this chip internal programming is finished extending out the chip selection logic of RAM, modulus conversion chip, the fetch equipment address code, the mode of operation of distributing the LED display lamp, and will deliver on the DSP data bus after the sampled data buffering.And high-frequency signal wherein adopts described capture circuit to catch, and system will write down thunderbolt number of times and Leakage Current.
Described digital signal processor adopts the FIR filtering of windowing, uses fast fourier transform to extract the fundamental phase and the fundametal compoment peak value of the relative bus of Leakage Current signal at last.
Described signal conditioning circuit comprises in-phase amplifier circuit, filtering circuit and the voltage follower circuit that connects successively.This in-phase amplifier circuit, filtering circuit and voltage follower circuit are known circuit.
This in-phase amplifier circuit has higher input impedance, and input and output are with the AD Acquisition Circuit is favourable relatively.As shown in Figure 3, be the connection diagram of the in-phase amplifier circuit in the signal conditioning circuit of the present invention.Signal enters operational amplifier OPA2277 through resistance R A142, carries out the homophase amplification by feedback resistance RA122 and amplifier and obtains signal, in the output of resistance R A112 end.
Consider the requirement and the stability of sqignal conditioning, filtering circuit of the present invention has adopted the second order Butterworth filter, as shown in Figure 4, is the connection diagram of the filtering circuit in the signal conditioning circuit of the present invention.The one-level end that signal CH1_IN imports by capacitor C 2 and amplifier by 3 pin of operational amplifier OPA2277 forms filtering, output signal CH1_OUT1, CH1_OUT1 with input resistance R5 and feedback resistance R1, partially installing capacitor C7 the amplifier of OPA2277 form second order Butterworth filter, output signal CH1_OUT2.
As shown in Figure 5, be voltage follower circuit connection diagram in the signal conditioning circuit of the present invention.Signal REFOUT is from the 3 pin input of amplifier OPA3350, and 2 pin and output terminal pin 1 connect into voltage follow, thereby obtain following signal REFIN.
Fig. 6 is the connection diagram of capture circuit of the present invention.It mainly is that the signal that will collect passes through diode D9 and D3 rectification, the voltage comparator circuit that constitutes via operational amplifier LM139 and basic resistance, electric capacity then, compare by input signal and stiff end input voltage 2.5V, if the signal input is arranged, output terminal is with input high level.If the no signal input, then output terminal will keep low level.Thereby the signal value that can obtain happening suddenly is caught by the capture pin of system's master chip.
To sum up, the on-line measuring device of lightning arrester of the present invention adopts compound CT and totally digital circuit, can realize real time record, demonstration and memory function, energy captured in real time thunderbolt number of times and Leakage Current, and with instantaneous accurate record of thunderbolt time.
Claims (10)
1. a compound current transformer comprises one zero flux current sensors, it is characterized in that: also be provided with a high frequency sensors on the described zero flux current sensor.
2. compound current transformer according to claim 1, it is characterized in that: this compound current transformer is that permalloy and iron sample body are overlapped into a superimposed magnetic core, will respectively the coil of described zero flux current sensor and the coil winding of high frequency sensors be encapsulated after on this superimposed magnetic core again.
3. compound current transformer according to claim 2 is characterized in that: be provided with multilayer screen between described permalloy and the iron sample body, this multilayer screen comprises copper and the pure iron that sets gradually at least from outside to inside.
4. compound current transformer according to claim 1 is characterized in that: described high frequency sensors is all identical with size with original zero flux current sensor shape.
5. the on-line measuring device of a lightning arrester, it is characterized in that: comprise each described compound current transformer of claim 1 to 4, also comprise a reference power source current transformer, a signal conditioning circuit, A/D conversion sample circuit, a digital signal processor, a programmable logic device (PLD), and a capture circuit;
Described compound current transformer and reference power source current transformer all are connected to signal conditioning circuit; Described signal conditioning circuit, A/D conversion sample circuit, digital signal processor, and described programmable logic device (PLD) connects in turn; Described programmable logic device (PLD) connects described A/D conversion sample circuit again; Described compound current transformer connects described digital signal processor by described capture circuit again.
6. the on-line measuring device of lightning arrester according to claim 5, it is characterized in that: this on-line measuring device also comprises a LED display lamp that is connected with described digital signal processor.
7. the on-line measuring device of lightning arrester according to claim 6, it is characterized in that: it is the chip of EPM3128 that described programmable logic device (PLD) adopts model, this chip internal programming is finished extending out the chip selection logic of RAM, modulus conversion chip, the fetch equipment address code, the mode of operation of distributing the LED display lamp, and will deliver on the DSP data bus after the sampled data buffering.
8. the on-line measuring device of lightning arrester according to claim 5, it is characterized in that: described digital signal processor adopts the FIR filtering of windowing, uses fast fourier transform to extract the fundamental phase and the fundametal compoment peak value of the relative bus of Leakage Current signal at last.
9. the on-line measuring device of lightning arrester according to claim 5 is characterized in that: described signal conditioning circuit comprises in-phase amplifier circuit, filtering circuit and the voltage follower circuit that connects successively.
10. the on-line measuring device of lightning arrester according to claim 5, it is characterized in that: this on-line measuring device also connects a PC, and this PC is connected to the described digital signal processor of stating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201814590U CN201562027U (en) | 2009-11-25 | 2009-11-25 | Composite current transformer and on-line detection device for lightning arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201814590U CN201562027U (en) | 2009-11-25 | 2009-11-25 | Composite current transformer and on-line detection device for lightning arrester |
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| CN201562027U true CN201562027U (en) | 2010-08-25 |
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| CN2009201814590U Expired - Lifetime CN201562027U (en) | 2009-11-25 | 2009-11-25 | Composite current transformer and on-line detection device for lightning arrester |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288850A (en) * | 2011-07-11 | 2011-12-21 | 广东电网公司电力科学研究院 | Zinc oxide arrester monitoring device |
| CN102721854A (en) * | 2012-05-31 | 2012-10-10 | 重庆市电力公司綦南供电局 | Method and system for detecting overvoltage signal of power grid |
| CN103616583A (en) * | 2013-11-15 | 2014-03-05 | 国家电网公司 | Lightning arrester on-line monitoring device |
| CN106199357A (en) * | 2016-07-20 | 2016-12-07 | 国网天津市电力公司 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
| CN110632376A (en) * | 2019-09-27 | 2019-12-31 | 上海锐开电气有限公司 | Iron core and folder ground current monitoring devices based on transformer copper bar ground connection |
-
2009
- 2009-11-25 CN CN2009201814590U patent/CN201562027U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288850A (en) * | 2011-07-11 | 2011-12-21 | 广东电网公司电力科学研究院 | Zinc oxide arrester monitoring device |
| CN102721854A (en) * | 2012-05-31 | 2012-10-10 | 重庆市电力公司綦南供电局 | Method and system for detecting overvoltage signal of power grid |
| CN102721854B (en) * | 2012-05-31 | 2015-08-05 | 重庆市电力公司綦南供电局 | Power network overvoltage signal detection method and system |
| CN103616583A (en) * | 2013-11-15 | 2014-03-05 | 国家电网公司 | Lightning arrester on-line monitoring device |
| CN106199357A (en) * | 2016-07-20 | 2016-12-07 | 国网天津市电力公司 | A kind of recombination current sensor of XLPE power cable in switch cubicle |
| CN110632376A (en) * | 2019-09-27 | 2019-12-31 | 上海锐开电气有限公司 | Iron core and folder ground current monitoring devices based on transformer copper bar ground connection |
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Granted publication date: 20100825 |