CN201489082U - Sensor and device for monitoring partial discharge of gas-insulated metal-enclosed switch - Google Patents
Sensor and device for monitoring partial discharge of gas-insulated metal-enclosed switch Download PDFInfo
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- CN201489082U CN201489082U CN2009201531159U CN200920153115U CN201489082U CN 201489082 U CN201489082 U CN 201489082U CN 2009201531159 U CN2009201531159 U CN 2009201531159U CN 200920153115 U CN200920153115 U CN 200920153115U CN 201489082 U CN201489082 U CN 201489082U
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Abstract
The utility model provides a sensor and a device for monitoring the partial discharge of a gas-insulated metal-enclosed switch. The sensor comprises an induction electrode, a conductive rod, a monitoring joint and a terminal resister, wherein the induction electrode is used for inducing ultrahigh frequency electromagnetic waves generated during the partial discharge of the gas-insulated metal-enclosed switch device; the conductive rod is used for sending the ultrahigh frequency electromagnetic waves to the monitoring joint; one end of the monitoring joint is connected with the terminal resister, and the terminal resister is grounded; and the other end of the monitoring joint is connected with signal display equipment. The ultrahigh frequency electromagnetic waves can be propagated in an GIS effectively due to a coaxial structure of the GIS, and the frequency of an on-site interference signal is attenuated quickly during propagation in air; and thus the device for monitoring the partial discharge of the GIS based on an ultrahigh frequency method can accurately monitor whether the inside of the GIS generates the partial discharge or not without being influenced by an on-site low-frequency interference signal.
Description
Technical field
The utility model relates to electric monitoring technical field, particularly a kind of sensor and device for monitoring local discharge of gas insulated metal enclosed switch.
Background technology
Because reasons such as the manufacturing process of Cubicle Gas-Insulated Switchgear (GIS, Gas Insulated Switchgear) and transportation, assembled in situ, inevitably there is insulation defect in GIS.This class defective can produce shelf depreciation under the voltage effect, thereby brings out insulation fault.From operation practice, insulation fault is factor very important in the GIS fault all the time, and, along with the raising failure rate of insulation of electric pressure rises thereupon.Therefore, more and more manufactured producer of insulation diagnosis technology and the user of the on-the-spot GIS of extra-high voltage pay attention to, and wherein most importantly carry out the GIS partial discharge monitoring.
At present, the conventional method of monitoring shelf depreciation is the ultrasonic monitoring method.The ultrasonic monitoring ratio juris is: when shelf depreciation took place, GIS can launch voice signal.By the validity of voice signal that analyze to gather, the size of peak value, the proportionate relationship of effective value and peak value can be judged the shelf depreciation and the position thereof of GIS existence.
Because the method for routine measurement GIS shelf depreciation is according to ultrasonic principle, and the sensitive volume of the sensor that supersonic testing method uses is 20-100KHz.The frequency of main electromagnetic interference signal such as the corona discharge in the electric system is generally below 150MHz.Therefore, the sensitive volume of the sensor of supersonic testing method utilization is subjected to the interference of electromagnetic interference signal in the electric system easily, thereby causes monitoring GIS shelf depreciation inaccurate.
The utility model content
The technical problems to be solved in the utility model is a kind of sensor and device for monitoring local discharge of gas insulated metal enclosed switch, can not be subjected to the interference of site environment, and monitoring accurately.
The utility model provides a kind of sensor, comprises induction electrode, contact rod, monitoring joint and terminal resistance;
Described induction electrode, the superfrequency electromagnetic wave that produces when being used to respond to the Cubicle Gas-Insulated Switchgear shelf depreciation;
Described contact rod is used for described superfrequency electromagnetic wave is sent to described monitoring joint;
One end connecting terminal resistance of described monitoring joint, described terminal resistance ground connection;
The other end of described monitoring joint connects signal apparatus.
Preferably, described induction electrode is a disc-shape, and material is an aluminium.
Preferably, the outside of described superfrequency sensor is provided with terminal box, described terminal box ground connection.
Preferably, described monitoring joint is the coaxial fitting of N type.
Preferably, described signal apparatus is an oscillograph.
The utility model also provides a kind of device for monitoring local discharge of gas insulated metal enclosed switch, comprising: amplifier, oscillograph and described sensor.
Described sensor is installed in the inside of Cubicle Gas-Insulated Switchgear, the superfrequency electromagnetic wave that produces when being used to monitor the Cubicle Gas-Insulated Switchgear shelf depreciation, the superfrequency electromagnetic wave that monitors is converted to voltage signal, sends described voltage signal to described amplifier;
Described amplifier is used to amplify described voltage signal, and the voltage signal after amplifying is sent to described oscillograph;
Described oscillograph is used to show the voltage signal after the described amplification, and the voltage calibration on the described oscillograph is demarcated the corresponding quantity of electric charge through pulse current method in advance.
Preferably, the voltage calibration on the described oscillograph is specially through the corresponding quantity of electric charge of pulse current method demarcation in advance:
In the laboratory, utilize described sensor and pulse current method monitoring local discharge of gas insulated metal enclosed switch simultaneously, the voltage signal that the corresponding calibration sensor of charge value of monitoring with described pulse current method monitors.
Compared with prior art, the utlity model has following advantage:
Sensor that the utility model provides and monitoring GIS shelf depreciation device, utilize superfrequency (UHF, Ultra High Frenqency) method monitoring GIS shelf depreciation, the electromagnetic wave signal that monitors is converted to voltage signal, voltage signal amplifies through amplifier, is presented on the oscillograph.The utility model is measured the GIS shelf depreciation by pulse current method and superfrequency method in advance simultaneously in the laboratory, the magnitude of voltage that utilizes pulse current method that the superfrequency method is measured carries out the demarcation of the quantity of electric charge.Obtain the corresponding quantity of electric charge by tabling look-up by the voltage readings on the observation oscilloscope during actual monitoring, judge whether GIS inside shelf depreciation takes place.The electromagnetic wave that the GIS shelf depreciation produces comprises the frequency content greater than 1GHz.Because the coaxial configuration of GIS self, the superfrequency electromagnetic wave can be propagated effectively in GIS inside, and that the frequency of on-the-spot undesired signal decays when propagating in air is very fast.Therefore, the utility model can not be subjected to the influence of on-the-spot low-frequency interference signal based on the device of superfrequency method monitoring GIS shelf depreciation, can accurately monitor GIS inside and whether produce shelf depreciation.
Description of drawings
Fig. 1 is based on the utility model apparatus structure synoptic diagram;
Fig. 2 is based on the utility model superfrequency sensor synoptic diagram;
Fig. 3 is based on the circuit theory diagrams of the utility model monitoring GIS shelf depreciation;
Fig. 4 is based on the main electrical scheme of GIS in the utility model 1100kV transformer station;
Fig. 5 is based on the schematic layout pattern of the monitoring GIS shelf depreciation device of Fig. 4.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
In order to make those skilled in the art understand the utility model better, simply introduce the principle that the superfrequency method is measured the GIS shelf depreciation below.
The site test of GIS shelf depreciation and online detection all can be adopted the UHF detection method, its principle is: the current impulse that produces during shelf depreciation in the GIS inspires electromagnetic wave, comprise medium and low frequency and UHF section (0.3～3GHz) electromagnetic wave, wherein the ultrahigh frequency composition can be propagated effectively in GIS inside, and the signal that receives according to sensor is analyzed the order of severity and the position thereof of shelf depreciation then.Owing to use the UHF segment signal to detect, can avoid conventional electrical Interference (mainly be＜corona of 150MHz disturb).
The utility model is based on superfrequency ratio juris on-line monitoring GIS shelf depreciation.
Describe the composition of described superfrequency sensor in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is based on the utility model superfrequency sensor synoptic diagram.
The sensor that present embodiment provides comprises induction electrode 103, terminal resistance 105, monitoring joint 106, concentric cable 107 and contact rod 108.
Described induction electrode 103 is arranged on the inside of GIS housing 102, is used to respond to the superfrequency electromagnetic wave that the GIS internal discharge produces.
The center of GIS housing 102 is a GIS conductor 101.
Need to prove that the preferred induction electrode 103 of present embodiment is a disc-shape, material is an aluminium.
Described conduction copper rod 108 materials are copper, can select other conductors as required for use.
One end connecting terminal resistance 105 of described monitoring joint 106, the other end connects amplifier by concentric cable 107.
Described terminal resistance 105 ground connection.
Described terminal resistance 105 has two effects: 1) as build-out resistor, make the transmission signals maximization; The preferred standard value can be about 50 Ω; 2) prevent superpotential, guarantee operating personnel's safety.
The outside of described superfrequency sensor is provided with terminal box 104, described terminal box 104 ground connection.Terminal box 104 can play effect fixing and protection superfrequency sensor.
Described monitoring joint 106 is the coaxial fitting of N type.
The induction electrode of the sensor that present embodiment provides is arranged on the inside of GIS housing.Because the inner high pressure SF6 gas of filling of GIS, shelf depreciation always takes place in very among a small circle, therefore has the breakdown time that is exceedingly fast.This when having fast rise the partial discharge pulse on edge include from direct current to the frequency content that surpasses 1GHz.Ultrahigh frequency (can propagate effectively in the coaxial configuration of GIS by 300～3000MHz) electromagnetic waves, therefore select the electromagnetic wave of hyper band can avoid low-frequency environmental interference signal as monitor signal, thereby the raising signal to noise ratio (S/N ratio), the accuracy of assurance monitoring shelf depreciation.
Referring to Fig. 2, this figure is based on the utility model apparatus structure synoptic diagram.
The device of the monitoring GIS shelf depreciation that present embodiment provides comprises sensor 201, amplifier 202 and oscillograph 203.
Described sensor 201 is installed in the inside of Cubicle Gas-Insulated Switchgear, the superfrequency electromagnetic wave that produces when being used to monitor the Cubicle Gas-Insulated Switchgear shelf depreciation, the superfrequency electromagnetic wave that monitors is converted to voltage signal, sends described voltage signal to described amplifier 202.
The concrete structure preamble of described sensor has been done detailed introduction, does not repeat them here.
Described amplifier 202 is used to amplify described voltage signal, and the voltage signal after amplifying is sent to described oscillograph 203.
Since the signal of super high band a little less than, therefore need to adopt accurate amplifier that monitored signal is amplified.
The frequency range of the preferred amplifier of present embodiment is 2～2600MHz, gains to be+40dB.
Described oscillograph 203 is used to show the voltage signal after the described amplification, and voltage calibration is demarcated the corresponding quantity of electric charge through pulse current method in advance on the described oscillograph 203.
It is 40GS/s that the preferred oscillograph of present embodiment adopts maximum sampling rate, and analog bandwidth is 2.5GHz.
Need to prove that the utility model embodiment adopts the shelf depreciation situation of superfrequency method and pulse current method synchro measure GIS inside in advance in the laboratory.The magnitude of voltage that utilizes pulse current method that the superfrequency method is measured is demarcated, and obtains the quantity of electric charge of voltage signal correspondence.Then, on physical device, can utilize superfrequency method monitoring GIS shelf depreciation situation separately.Because pulse current method is subjected to the site environment serious interference, be not suitable for middle at the scene monitoring GIS shelf depreciation.And the superfrequency method is not subjected to the influence of on-the-spot undesired signal, can accurately monitor GIS inside and shelf depreciation whether occur.
Introduce the principle of the sensor monitors GIS shelf depreciation that the utility model provides below, referring to Fig. 3, this figure is the circuit theory diagrams based on the utility model monitoring GIS shelf depreciation.
Equivalence is a capacitor C 1 between GIS conductor 101 and the induction electrode.
Equivalence is a capacitor C 2 between induction electrode and the ground.
Tie point between capacitor C 1 and the capacitor C 2 is defined as the A point.
Parallel resistance R between A point and the ground, promptly resistance R is in parallel with capacitor C 2.
The A point is directly exported monitor signal.
As can be seen from Figure 3, the monitor signal of output is the voltage signal on capacitor C 2 and the resistance R.
The utility model is by demarcating the superfrequency voltage signal of measuring in the laboratory.
Utilize superfrequency method and pulse current method synchronous monitoring GIS shelf depreciation, concrete grammar is: place foreign matter at subjects cylindrical shell place, pressurization makes the foreign matter discharge.Insulating basin separates subjects cylindrical shell and test with GIS, in the time of can preventing the foreign matter discharge like this test is destroyed with GIS.Test has function in conjunction with capacitor with GIS.The disc type induction electrode of sensor can be monitored out test with the superfrequency electromagnetic wave of propagating in the GIS, and the superfrequency electromagnetic wave is converted to voltage signal, and described voltage signal is presented on the oscillograph after amplifying through amplifier.
Because the GIS shelf depreciation is to utilize superfrequency method and pulse current method synchro measure, so the apparent charge of the voltage signal correspondence of superfrequency method monitoring can be demarcated by pulse current method.
Introduce the position that the superfrequency sensor is installed among the utility model embodiment below.At first introduce the main electrical scheme of GIS in the 1100kV transformer station, referring to Fig. 4.
Fig. 4 only illustrates the synoptic diagram of first section bus, and 1M represents first section bus.1 main transformer is represented first main-transformer.
Be symmetrical arranged current transformer, grounding switch (ES, Earth Switch) and disconnector (DS, Disconnect Switch) successively in the both sides of isolating switch GCB (Gas Circuit Breaker).
When the experiment shop experiment, the superfrequency sensor can be measured the discharge charge amount of about 3pC.
When the branch bar of local discharge signal by insulating basin and GIS, will decay, obtaining the attenuation rate of ultrahigh-frequency signal by an insulating basin of 1100kV GIS according to the experimental measurement data is about 16%, and the attenuation rate of a L shaped bus is about 30%.
The judgement of on-the-spot pad value: the utility model embodiment uses the amplifier of enlargement factor as 40dB in the on-the-spot partial discharge monitoring device of 1100kV superfrequency.
When near the superfrequency sensor shelf depreciation of 10pC taking place by an insulating basin, the voltage of output is about 50000mV.When the branch bar of local discharge signal by insulating basin and GIS, will decay.In the configuration of present embodiment sensor, the worst case of the peak value of local discharge signal is to decay to 5% of initial value.Therefore, for the partial discharge monitoring device that present embodiment is provided can monitor the shelf depreciation of 10pC at the scene, set its determinating reference to be: 50000mV * 0.05=2500mV.
Referring to Fig. 5, this figure is the schematic layout pattern based on the monitoring GIS shelf depreciation device of Fig. 4.
Present embodiment is provided with a plurality of superfrequency sensors in the GIS of 1100kV transformer station wiring, as shown in the figure, A, B and three bushings of C place expression, these three bushings connect three buses respectively, and the superfrequency sensor of a plurality of monitoring GIS shelf depreciations is set on every bus.
8 groups of superfrequency sensors have been installed on this section wiring diagram, 501-508 as shown in Figure 5, every group comprises 3 superfrequency sensors, therefore, is provided with 24 superfrequency sensors altogether.
The size of the local discharge signal that each more pre-buried superfrequency sensor is monitored, the superfrequency sensing station of local discharge signal maximum are the position near discharge source.Can the particular location of GIS shelf depreciation be positioned like this.
Need to prove that 24 superfrequency sensors can a shared cover amplifier and an oscillograph, also can divide several one group of shared cover amplifier and oscillograph, also can be equipped with a cover amplifier and an oscillograph separately by each superfrequency sensor.
After judging the discharge source position,, after the enlargement factor in conjunction with the attenuation rate of local discharge signal and amplifier, calculate the quantity of electric charge of shelf depreciation according to the oscillographic reading in scene.
The utility model embodiment judges that by the superfrequency sensor benchmark of GIS generation shelf depreciation is:
In the network system of neutral point effective grounding, if GIS is at voltage 1.1Um/
Down, wherein Um is meant the highest working voltage of electrical network, and the GIS partial discharge quantity of each interval measurement judges that GIS produces shelf depreciation during greater than 5pC; If single insulating part GIS partial discharge quantity during greater than 3pC, judges that GIS produces shelf depreciation.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (7)
1. a sensor is characterized in that, comprises induction electrode, contact rod, monitoring joint and terminal resistance;
Described induction electrode, the superfrequency electromagnetic wave that produces when being used to respond to the Cubicle Gas-Insulated Switchgear shelf depreciation;
Described contact rod is used for described superfrequency electromagnetic wave is sent to described monitoring joint;
One end connecting terminal resistance of described monitoring joint, described terminal resistance ground connection;
The other end of described monitoring joint connects signal apparatus.
2. sensor according to claim 1 is characterized in that, described induction electrode is a disc-shape, and material is an aluminium.
3. sensor according to claim 1 is characterized in that the outside of described superfrequency sensor is provided with terminal box, described terminal box ground connection.
4. sensor according to claim 1 is characterized in that, described monitoring joint is the coaxial fitting of N type.
5. sensor according to claim 1 is characterized in that, described signal apparatus is an oscillograph.
6. a device for monitoring local discharge of gas insulated metal enclosed switch is characterized in that, comprising: amplifier, oscillograph and sensor as claimed in claim 1;
Described sensor is installed in the inside of Cubicle Gas-Insulated Switchgear, the superfrequency electromagnetic wave that produces when being used to monitor the Cubicle Gas-Insulated Switchgear shelf depreciation, the superfrequency electromagnetic wave that monitors is converted to voltage signal, sends described voltage signal to described amplifier;
Described amplifier is used to amplify described voltage signal, and the voltage signal after amplifying is sent to described oscillograph;
Described oscillograph is used to show the voltage signal after the described amplification, and the voltage calibration on the described oscillograph is demarcated the corresponding quantity of electric charge through pulse current method in advance.
7. device for monitoring local discharge of gas insulated metal enclosed switch according to claim 6 is characterized in that, the voltage calibration on the described oscillograph is demarcated the corresponding quantity of electric charge through pulse current method in advance and is specially:
In the laboratory, utilize described sensor and pulse current method monitoring local discharge of gas insulated metal enclosed switch simultaneously, the voltage signal that the corresponding calibration sensor of charge value of monitoring with described pulse current method monitors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201531159U CN201489082U (en) | 2009-06-24 | 2009-06-24 | Sensor and device for monitoring partial discharge of gas-insulated metal-enclosed switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201531159U CN201489082U (en) | 2009-06-24 | 2009-06-24 | Sensor and device for monitoring partial discharge of gas-insulated metal-enclosed switch |
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| CN201489082U true CN201489082U (en) | 2010-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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2009
- 2009-06-24 CN CN2009201531159U patent/CN201489082U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866621A (en) * | 2021-09-26 | 2021-12-31 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
| CN113866621B (en) * | 2021-09-26 | 2023-06-13 | 广东电网有限责任公司 | Partial discharge signal detection system of high-voltage switch cabinet |
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