CN103728483A - Device and method for detecting current generation of secondary circuit due to disconnecting switch operation - Google Patents
Device and method for detecting current generation of secondary circuit due to disconnecting switch operation Download PDFInfo
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- CN103728483A CN103728483A CN201310754712.8A CN201310754712A CN103728483A CN 103728483 A CN103728483 A CN 103728483A CN 201310754712 A CN201310754712 A CN 201310754712A CN 103728483 A CN103728483 A CN 103728483A
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Abstract
The invention provides a device for detecting current generation of a secondary circuit due to disconnecting switch operation. The device comprises a primary device, a secondary device, an iron core and an oscilloscope. The primary device is connected with the secondary device through the secondary circuit. A coil is wound around the iron core. A wire of the secondary circuit to be detected penetrates through the iron core. The two ends of the coil are connected with the oscilloscope. When the current flows across the secondary circuit to be detected, the iron core is used for generating an induction current through the coil and generating induction voltages across the two ends of the coil. When the current flows across the secondary circuit to be detected, the oscilloscope is used for detecting the induction voltages generated across the two ends of the coil and outputting a detection result. The invention further provides a method for detecting the current generated by the secondary circuit caused by disconnecting switch operation. According to the device and method for detecting the current generated by the secondary circuit caused by disconnecting switch operation, whether the phenomenon that disconnecting switch operation causes the secondary circuit to generate the induction current occurs or not can be simply and effectively detected.
Description
Technical field
The present invention relates to disconnector test field, particularly relate to a kind of isolator operation and cause the pick-up unit of secondary circuit generation current, and a kind of isolator operation causes the detection method of secondary circuit generation current.
Background technology
In the last few years, when being operated in grid switching operation, the transmission or not of some 500kV high voltage substations often occurred that disconnector divided, closes difficult situation, must be through repeatedly dividing, closing, and even manual operation just can complete transmission or not task.This repetitive operation had both affected the reliability of safe operation and the power supply of equipment, had extended again power off time, had caused length consuming time, inefficient adverse consequences.Causing one of reason of this problem is electromagnetic interference (EMI) and the electromagnetic compatibility due to electric system.
Along with the development of electric utility, net capacity, electric pressure improve constantly, and the electromagnetic compatibility problem of electric system more and more receives publicity.Transformer station is primary equipment and the most concentrated place of secondary device in electric system; the equipment such as relay protection, measure and control device is connected with primary equipment by control loop, measuring circuit and cable etc., and bears various electromagnetic interference (EMI) in the strong electromagnetic environment in transformer station.Due to the coupling of equipment and electromagnetic disturbance source closely, electromagnetic compatibility problem is also more outstanding, especially, in the strong electromagnetic environment such as UHV (ultra-high voltage), ultra-high voltage transformer station, Electro Magnetic Compatibility is had higher requirement.
Electromagnetic interference (EMI) and the electromagnetic compatibility problem of electric system more and more come into one's own.All there is electromagnetic interference problem in high voltage substation steady-state operation and transient state process.The transient electromagnetic field that switching manipulation process produces is one of electromagnetic interference source important in transformer station, and the transient electromagnetic field that therefore detector switch operating process produces is a difficult problem urgently to be resolved hurrily.
Summary of the invention
Based on this, the invention provides a kind of isolator operation and cause pick-up unit and the method for secondary circuit generation current, can simple and effectively detect isolator operation and whether cause that secondary circuit produces induction current.
Isolator operation causes a pick-up unit for secondary circuit generation current, comprises primary equipment, secondary device, iron core and oscillograph;
Described primary equipment is connected with described secondary device by secondary circuit, and described iron core is wound with coil, and the wire of secondary circuit to be detected is through in described iron core, and the two ends of described coil connect described oscillograph;
Described iron core, for when secondary circuit to be detected has electric current to flow through, produces induction current by described coil, at the two ends of described coil, produces induced voltage; When described oscillograph is used for having electric current to flow through in described loop to be detected, detect the induced voltage of the two ends generation of described coil, output detections result.
Isolator operation causes a detection method for secondary circuit generation current, comprises the steps:
The wire of secondary circuit to be detected is passed and is wound with in the iron core of coil;
At the coil two ends of described iron core access oscillograph;
Disconnector is carried out to breaking-closing operating;
When disconnector is carried out to breaking-closing operating, by oscillograph, detect the induced voltage of the two ends generation of described coil, output detections result.
Above-mentioned isolator operation causes pick-up unit and the method for secondary circuit generation current, according to Ampere circuit law, iron core is passed in loop to be detected, if isolator operation causes secondary circuit generation current, the coil on iron core will produce induction current, two ends can produce induced voltage, by the oscillograph that is connected on coil two ends, detect induced voltage, output detections result; The invention provides a kind of brand-new detection technique, this technology is workable, is applicable to promote in transformer station.
Accompanying drawing explanation
Fig. 1 is the structural representation in one embodiment of pick-up unit that isolator operation of the present invention causes secondary circuit generation current.
Fig. 2 is secondary circuit schematic diagram in Fig. 1.
Fig. 3 is the schematic flow sheet in one embodiment of detection method that isolator operation of the present invention causes secondary circuit generation current.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As shown in Figure 1, be the structural representation in one embodiment of pick-up unit that a kind of isolator operation of the present invention causes secondary circuit generation current, comprise primary equipment, secondary device, iron core and oscillograph;
Described primary equipment is connected with described secondary device by secondary circuit, and described iron core is wound with coil, and the wire of secondary circuit to be detected is through in described iron core, and the two ends of described coil connect described oscillograph;
Described iron core, for when secondary circuit to be detected has electric current to flow through, produces induction current by described coil, at the two ends of described coil, produces induced voltage; When described oscillograph is used for having electric current to flow through in described loop to be detected, detect the induced voltage of the two ends generation of described coil, output detections result;
In the present embodiment, can in advance one side of iron core be coiled, with gauze, the two ends milled of coil, access oscillograph; This pick-up unit is for detection of electric system, comprise primary equipment and secondary device, primary equipment is connected with described secondary device by secondary circuit, and in conjunction with Fig. 2 (in figure, primary equipment is not shown), the secondary circuit of the present embodiment can be secondary cable, primary equipment comprises disconnector, the wire of secondary circuit to be detected is passed to iron core, when secondary circuit has electric current to flow through, according to Ampere circuit law, coil on iron core will produce induction current, and two ends can produce induced voltage; By oscillograph, detect induced voltage and can obtain testing result.
In a preferred embodiment, described oscillograph is also for detection of frequency and the amplitude of described induced voltage, generate the waveform of described induced voltage, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, output isolator operation causes that secondary circuit produces the testing result of induction excess current;
Oscillograph in the present embodiment can be used to detect the waveform of induced voltage, by the monitoring to waveform with analyze known, when disconnector is carried out to breaking-closing operating, the amplitude of the voltage waveform that secondary loop current is responded to and frequency there will be obvious variation, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, voltage waveform has significant change, can judge that isolator operation causes that secondary circuit produces induction current.
In a preferred embodiment, described coil is copper wire coil; This type of coil can truly reduce input current, makes testing result more accurate.
In a preferred embodiment, on described iron core, be wound with the copper wire coil that is not less than 40 circles, the induction current of input can more accurately be detected.
In a preferred embodiment, described secondary circuit to be detected comprises that well heater loop or primary side disconnector detect loop.
The present embodiment utilizes the measurement of the waveform voltage signal that oscillograph responds to electric current in secondary circuit, and the high-frequency signal producing while verifying primary circuit disconnector divide-shut brake can be coupled in secondary circuit.When the principle of the present embodiment is primary circuit high voltage isolator operation, between contact, can produce a series of arc process, extinguishing and restriking of electric arc will cause a series of high-frequency current ripples and voltage wave on the bus being disconnected or charge.In this case, bus can, by the line of bus or equipment room (being equivalent to antenna) by the space radiation towards periphery of the energy of transient electromagnetic field, form pulses of radiation electromagnetic field.Simultaneously, these a series of high-frequency current ripples on bus are coupled on secondary device by CT, and then the electric current in secondary circuit can be because primary side be coupled the high-frequency signal of coming and changing, utilize the waveform voltage signal that oscillograph induces on coil secondary loop current to measure, by the analysis to the voltage signal waveform of measuring, can show that the high-frequency signal producing can be coupled to secondary circuit when primary side disconnector divide-shut brake.
The principle that above-mentioned said secondary loop current induces voltage signal on coil is the same with the principle of work of Luo-coil, when the high-frequency signal of primary side switching manipulation generation is coupled on secondary cable, the high-frequency electromagnetic pulse that coupling produces is propagated to different directions along cable conductor and cable metal screen layer simultaneously, in near of coupled source, coupling pulse current concentrates in the sub-fraction of outer metal screen layer, through certain propagation distance, pulse current is little by little uniformly distributed on metal screen layer, from coupled source, to the electric current length that metal screen layer is uniformly distributed outside, by the wavelength of the pulse electromagnetic wave that is coupled, determined.Inhomogeneous electric current on this metal screen layer is by the magnetic field at the outside generation of cable some strength.Current sensor utilizes this principle exactly, when coupled signal, along cable, propagates while causing on measuring position changes of magnetic field, and the Luo-coil in sensor just can sense pulse signal.
Luo-coil is a kind of sensor, at secondary (detection) circuit inductance voltage, responds the variation of the magnetic flux of its encirclement, and the magnetic flux of its encirclement is to be produced by the electric current of simple circuit.The construction features of Luo-coil are on the uniform ring skeleton core of a nonmagnetic substance or ferromagnetic material formation, evenly after the little wire turn of coiling n circle, at coil two ends, connect terminal impedance Z again and measure exchange current, the principle of its measurement electric current can be regarded the direct application of Ampere circuit law as.
As shown in Figure 2, be the schematic flow sheet in one embodiment of detection method that isolator operation of the present invention causes secondary circuit generation current, comprise the steps:
S31, by the wire of secondary circuit to be detected through being wound with in the iron core of coil;
S32, at the coil two ends accesses oscillograph of described iron core;
S33, disconnector is carried out to breaking-closing operating;
S34, when disconnector is carried out to breaking-closing operating, by oscillograph detect described coil two ends produce induced voltage, output detections result.
In the present embodiment, can first one side of iron core be coiled, with gauze, the two ends milled of coil, access oscillograph; By the wire of secondary circuit to be detected, through iron core, when secondary circuit has electric current to flow through, according to Ampere circuit law, the coil on iron core will produce induction current, and two ends can produce induced voltage; By oscillograph, detect induced voltage and can obtain testing result.
In a preferred embodiment, also can comprise the steps:
By described oscillograph, detect frequency and the amplitude of described induced voltage, generate the waveform of described induced voltage, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, output isolator operation causes that secondary circuit produces the testing result of induction excess current.
Oscillograph in the present embodiment can be used to detect the waveform of induced voltage, by the monitoring to waveform with analyze known, when disconnector is carried out to breaking-closing operating, the amplitude of the voltage waveform that secondary loop current is responded to and frequency there will be obvious variation, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, voltage waveform has significant change, can judge that isolator operation causes that secondary circuit produces induction excess current.
In a preferred embodiment, described coil is copper wire coil; This type of coil can truly reduce input current, makes testing result more accurate.
In a preferred embodiment, on described iron core, be wound with the copper wire coil that is not less than 40 circles, the induction current of input can more accurately be detected.
In a preferred embodiment, described secondary circuit to be detected comprises that well heater loop or primary side disconnector detect loop.
A series of high-frequency signals that while the invention provides a kind of brand-new detection disconnector divide-shut brake, primary side occurs can be coupled to the device in secondary circuit, by the monitoring of the waveform voltage signal total loop in secondary circuit headstock or well heater loop current responded to oscillograph, the detection that the high-frequency signal producing while realizing primary side disconnector divide-shut brake is coupled to secondary side.The inventive method is simple, can be widely used in and in generating plant and transformer station, detect this type of superpotential test.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. isolator operation causes a pick-up unit for secondary circuit generation current, it is characterized in that, comprises primary equipment, secondary device, iron core and oscillograph;
Described primary equipment is connected with described secondary device by secondary circuit, and described iron core is wound with coil, and the wire of secondary circuit to be detected is through in described iron core, and the two ends of described coil connect described oscillograph;
Described iron core, for when secondary circuit to be detected has electric current to flow through, produces induction current by described coil, at the two ends of described coil, produces induced voltage; When described oscillograph is used for having electric current to flow through in described loop to be detected, detect the induced voltage of the two ends generation of described coil, output detections result.
2. isolator operation according to claim 1 causes the pick-up unit of secondary circuit generation current, described oscillograph is also for detection of frequency and the amplitude of described induced voltage, generate the waveform of described induced voltage, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, output isolator operation causes that secondary circuit produces the testing result of induction excess current.
3. isolator operation according to claim 1 causes the pick-up unit of secondary circuit generation current, it is characterized in that, described coil is copper wire coil.
4. isolator operation according to claim 1 causes the pick-up unit of secondary circuit generation current, it is characterized in that, is wound with the copper wire coil that is not less than 40 circles on described iron core.
5. isolator operation according to claim 1 causes the pick-up unit of secondary circuit generation current, and described secondary circuit to be detected comprises that well heater loop or primary side disconnector detect loop.
6. isolator operation causes a detection method for secondary circuit generation current, it is characterized in that, comprises the steps:
The wire of secondary circuit to be detected is passed and is wound with in the iron core of coil;
At the coil two ends of described iron core access oscillograph;
Disconnector is carried out to breaking-closing operating;
When disconnector is carried out to breaking-closing operating, by oscillograph, detect the induced voltage of the two ends generation of described coil, output detections result.
7. isolator operation causes and it is characterized in that the detection method of secondary circuit generation current according to claim 6, also comprises the steps:
By described oscillograph, detect frequency and the amplitude of described induced voltage, generate the waveform of described induced voltage, when the frequency of described induced voltage and the variation of amplitude exceed predetermined threshold value, output isolator operation causes that secondary circuit produces the testing result of induction excess current.
8. isolator operation causes and it is characterized in that the detection method of secondary circuit generation current according to claim 6, and described coil is copper wire coil.
9. isolator operation causes and it is characterized in that the detection method of secondary circuit generation current according to claim 6, is wound with the copper wire coil that is not less than 40 circles on described iron core.
10. isolator operation causes and it is characterized in that the detection method of secondary circuit generation current according to claim 6, and described secondary circuit to be detected comprises that well heater loop or primary side disconnector detect loop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310754712.8A CN103728483A (en) | 2013-12-31 | 2013-12-31 | Device and method for detecting current generation of secondary circuit due to disconnecting switch operation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310754712.8A CN103728483A (en) | 2013-12-31 | 2013-12-31 | Device and method for detecting current generation of secondary circuit due to disconnecting switch operation |
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| CN103728483A true CN103728483A (en) | 2014-04-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201269901Y (en) * | 2008-10-14 | 2009-07-08 | 河北旭辉电气股份有限公司 | Over-voltage monitoring device for electric grid |
| CN101504432A (en) * | 2009-01-24 | 2009-08-12 | 国网电力科学研究院 | Transient electromagnetic field measuring method for transforming plant |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN203672950U (en) * | 2013-12-31 | 2014-06-25 | 广东电网公司阳江供电局 | Detection device for current of secondary circuit caused by isolating switch operation |
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2013
- 2013-12-31 CN CN201310754712.8A patent/CN103728483A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201269901Y (en) * | 2008-10-14 | 2009-07-08 | 河北旭辉电气股份有限公司 | Over-voltage monitoring device for electric grid |
| CN101504432A (en) * | 2009-01-24 | 2009-08-12 | 国网电力科学研究院 | Transient electromagnetic field measuring method for transforming plant |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN203672950U (en) * | 2013-12-31 | 2014-06-25 | 广东电网公司阳江供电局 | Detection device for current of secondary circuit caused by isolating switch operation |
Non-Patent Citations (2)
| Title |
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| 侯俊 等: "500kV隔离开关操作时电流互感器二次侧干扰信号的测试与分析", 《电测与仪表》 * |
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