CN101655518B - High voltage capacitive-type equipment leakage current-resistance sampling sensor and installation method thereof - Google Patents
High voltage capacitive-type equipment leakage current-resistance sampling sensor and installation method thereof Download PDFInfo
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- CN101655518B CN101655518B CN 200910013252 CN200910013252A CN101655518B CN 101655518 B CN101655518 B CN 101655518B CN 200910013252 CN200910013252 CN 200910013252 CN 200910013252 A CN200910013252 A CN 200910013252A CN 101655518 B CN101655518 B CN 101655518B
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Abstract
The invention provides a high voltage capacitive-type equipment leakage current-resistance sampling sensor, which mainly comprises a casting aluminium box and a sampling circuit board, wherein, the circuit board is fixed in the casting aluminium box and is composed of a wire-wound high power sampling resistor and a protective circuit which are in parallel. The invention has the following innovations: 1) axial lead wires are used in the power-type wire-wound resistor of a sampling circuit, thus having the advantages of low temperature coefficient, small volume, high stability and the like; 2) a gas discharge tube used in the sampling circuit has stable breakdown voltage, can bear large current impact, has small interelectrode capacitance and can absorb transient overcurrent quickly; 3) a reliable protective circuit is designed for the sensor for bearing overvoltage impact resulted from frequent system operations; and 4) the sensor designed by using the method has simple structure and stable operation, and is suitable for field installation and use.
Description
One, technical field: the present invention relates to high voltage electric equipment insulating monitoring field, refer to a kind of sensor and installation method thereof that leakage current is taken a sample especially.
Two, background technology: the high voltage electric equipment insulation status directly influences the power grid security reliability service.According to the insulation system classification, the capacitance type equipment in the high voltage electric equipment occupies the majority.For high voltage capacitive-type equipment,, can find still to be in the defective of early stage of development by monitoring to its dielectric loss characteristic.
Be the dielectric loss angle tangent and the electric capacity of monitoring high voltage capacitive-type equipment insulation parameter, generally need the voltage signal and the leakage current signal of extraction equipment.Usually voltage signal can be obtained by voltage transformer secondary side, and leakage current is less, is generally a milliampere level, so how effectively to extract the difficult point that current signal is the high voltage capacitive-type equipment insulating monitoring.
Current domestic main employing centre path current sensor is measured leakage current, and the CT that promptly connects in sensor during on-the-spot the installation is contained in sensor sleeve in the screen loop, end of equipment under test.This class Design of Sensor principle is similar to transformer, and the ratio of electric current is inversely proportional to its number of turn approx in winding and the Secondary Winding.The advantage of this centre path current sensor is that the signal extraction mode that is adopted separates metering circuit and main circuit, does not have the direct connection of electricity, thereby can make secondary measuring equipment and computing machine avoid superpotential direct impact in the main circuit.Weak point is that there is iron core magnetic resistance in sensor, in the process of progress of disease electric current, must consume the sub-fraction electric current and be used for the excitatory iron core magnetization that makes, thereby at secondary coil generation induced potential and secondary current.Because the existence of exciting curent and iron loss exists ratio difference and phase angle difference between current sensor primary current and the secondary current.This error is inevitably, but can produce very big influence to the monitoring of high voltage capacitive-type equipment insulation parameter, because the dielectric loss angle of high voltage capacitive-type equipment insulation parameter is less than 1 °, its tangent value is usually between 0.2%～0.3%.
For the error between leakage current output and input signal is dwindled as far as possible, the researchist has adopted multiple error compensation mode, and hope can make the magnetic flux of straight-through current transformer near zero magnetic flux.But, facts have proved: because the long-term work of centre path current sensor is in the strong-electromagnetic field environment, and be applied in outdoor environment more, be subjected to by the number of accepting and believing little, very easily be subjected to the influence of disturbing factors such as electromagnetic field, temperature, humidity, so be difficult to reach high precision, good anti-electromagnetic interference capability and stability for a long time.
At present, the performance of leakage current sampling detector has become the main bottleneck that influences high voltage capacitive-type equipment insulation parameter measuring accuracy and state of insulation analyzing and diagnosing reliability.In view of present centre path current sensor exists limitation, be necessary to design a kind of high performance leakage current sampling detector.
Three, summary of the invention:
1, goal of the invention: the invention provides a kind of high voltage capacitive-type equipment leakage current sampling detector and installation method thereof, its objective is the current signal of extraction high voltage capacitive-type equipment leakage that can be accurately stable by designed sensor, thereby effectively monitor insulation parameters such as high voltage capacitive-type equipment dielectric loss angle tangent and electric capacity, guarantee device security stable operation.
2, technical scheme: the present invention is achieved through the following technical solutions:
A kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor; mainly comprise: a cast aluminium box shell and a sample circuit plate; the sample circuit plate is fixed on cast aluminium box enclosure, it is characterized in that the sample circuit plate is made of high-power sampled resistance of wire wound and holding circuit parallel connection.
Above-mentioned a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor is characterized in that: described cast aluminium box outer casing bottom has three perforation, and wherein two perforation are by cable, and series connection sample circuit plate is in screen loop, high voltage capacitive-type equipment end; Another root cable passes the 3rd perforation of cast aluminium box bottom, connects the detecting unit of sample circuit plate and systems such as on-line monitoring or live line measurement; Cast aluminium box case back has two ear shape projectioies, is used for shell is fixed to the appearance type equipment that needs detection.
Above-mentioned a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor is characterized in that: described holding circuit is composed in series by gas-discharge tube and high-power wire-wound resistor.
Above-mentioned a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor, it is characterized in that: the high-power sampled resistance of described wire wound adopts axial lead, the resistance of its selection: select the resistance and the rated power of resistance, I according to dispatch from the factory leakage current that electric capacity and system's phase voltage calculation obtain of tested appearance type equipment
L=2 π fUC,
, wherein: I
LBe leakage current, f is a system frequency, U is a voltage, C is an electric capacity, R is identical 2～3 the Wound-rotor type high-power resistances parallel connection of resistance, resistance rated power is higher 2～5 times than resistance actual motion power, if sensor application in on-line monitoring or live monitoring system, then the sample resistance value is than high 1～2 order of magnitude of conditioning resistance of signal condition part.
Above-mentioned a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor is characterized in that: the alternative condition of gas-discharge tube will satisfy: dc breakdown voltage is greater than the high-power sampled resistance both end voltage of wire wound:
The maximum impact electric current can bear the dash current that flows through capacitance type equipment.
The installation method of above-mentioned high voltage capacitive-type equipment leakage current-resistance sampling sensor is characterized in that: this method may further comprise the steps: the sample circuit plate is fixed on cast aluminium box enclosure; Two cables are connected with sample circuit plate in the box by two perforation of cast aluminium box outer casing bottom respectively, the sample circuit plate is connected in series in the screen loop, high voltage capacitive-type equipment end; Another root cable passes the 3rd perforation of cast aluminium box bottom, and the sample circuit plate is linked to each other with the detecting unit of systems such as on-line monitoring or live line measurement; The loam cake that covers cast aluminium box shell is also fixing; Steel band is passed two the ear shape bossings and the disconnecting link of cast aluminium box case back, and with steel band fixedly on the high voltage capacitive-type equipment tower bar; The sample circuit plate is in parallel with disconnecting link; When carrying out the leakage current signal sampling, disconnecting link is drawn back the back obtain leakage current by the sample circuit plate; When not needing to take a sample, short circuit ground connection disconnecting link closes.
3, advantage and effect: prove by retrieval, do not see the rig-site utilization report of the leakage current-resistance sampling sensor that directly seals in high voltage capacitive-type equipment end screen at present.The use of new sampling method can thoroughly solve the problem of dtmf distortion DTMF of leakage current simulating signal in sampling process, for new road of high voltage capacitive-type equipment insulation parameter monitoring mode research developing, help the on-line monitoring of converting equipment and applying of live line measurement.
The designed sensor of this inventive method can be applicable in the system of on-line monitoring and live line measurement; by to the sample of signal of leakage current and further monitor other insulation parameter; on-line monitoring and live line measurement system take further TVS surge protection in next stage signal condition part to the signal that obtains; protection can be implemented in the ps level time range surge voltage is produced response, and transient overvoltage accurately is controlled at certain level.
By the enforcement of technical solution of the present invention, the accurate and stable measurement that can really shield leakage current to the high voltage capacitive-type equipment end.Method for designing of the present invention has following innovative point:
1) sampling loop adopted power type wire wound resistor adopts axial lead, and it is low to have a temperature coefficient, and volume is little, characteristics such as stable height.
2) the gas-discharge tube stable breakdown voltage that sampling loop adopted can tolerate the large impact electric current, and interelectrode capacity is little, can fast Absorption transient state excess current.
3) impact in order to bear the superpotential that system's frequent operation brought, this sensor design the reliable protection circuit.
4) simple, stable by the designed sensor construction of this method, install and use at the scene of being suitable for.
Four, description of drawings:
Fig. 1 is the sensor construction synoptic diagram;
Fig. 2 is back synoptic diagram for sensor opens the lid;
Fig. 3 is a sensor sample circuit synoptic diagram;
Fig. 4 is the on-the-spot scheme of installation of sensor;
Five, embodiment:
A kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor, its primary structure is made up of a cast aluminium box and a sample circuit plate, below in conjunction with accompanying drawing this current sensor is made further specifying:
Fig. 1 is the sensor construction synoptic diagram, comprises cast aluminium box shell 1, sample circuit plate 2; Wherein sample circuit plate 2 is fixed on cast aluminium box shell 1 inside; Three perforation are arranged at casting box 1 bottom, cable is connected with the box interior circuit board by two perforation of cast aluminium box bottom, sample circuit plate 2 is connected in series in the screen loop, high voltage capacitive-type equipment end, and another perforation of cast aluminium box 1 bottom links to each other with the detecting unit of systems such as on-line monitoring or live line measurement; There are two ear shape projectioies at cast aluminium box 1 back, is used for whole sensor is fixed to the equipment that needs detection.
Fig. 2 is back synoptic diagram for sensor opens the lid; comprise cast aluminium box shell 1; sample circuit plate 2, wherein sample circuit plate 2 is made of high-power sampled resistance 3 of wire wound and holding circuit parallel connection, and holding circuit comprises the series circuit of being made up of gas-discharge tube 4 and high-power wire-wound resistor 5.
Fig. 3 is a sensor sample circuit synoptic diagram, comprises wire wound high-power sampled resistance 3, gas-discharge tube 4 and high-power wire-wound resistor 5.
Fig. 4 is the on-the-spot scheme of installation of sensor, comprises the sensor of being made up of cast aluminium box shell 1 and sample circuit plate 2, high voltage capacitive-type equipment tower bar 6, the detecting unit 8 of systems such as disconnecting link 7 and on-line monitoring or live line measurement.The concrete installation method of sensor may further comprise the steps: sample circuit plate 2 is fixed on the cast aluminium box shell 1 inner sensor of forming; Two cables are connected with sample circuit plate 2 in the box by two perforation of cast aluminium box shell 1 bottom respectively, sample circuit plate 2 is connected in series in the screen loop, high voltage capacitive-type equipment end; Another root cable passes the 3rd perforation of cast aluminium box 1 bottom, and sample circuit plate 2 is linked to each other with the detecting unit 8 of systems such as on-line monitoring or live line measurement; The loam cake that covers cast aluminium box shell 1 is also fixing; Steel band is passed two the ear shape bossings 9 and the disconnecting link 7 at cast aluminium box shell 1 back, and steel band is fixed on the high voltage capacitive-type equipment tower bar 6; Sample circuit plate 2 in parallel and disconnecting link 7; When carrying out the leakage current signal sampling, disconnecting link 7 is drawn back the back obtain leakage current by sample circuit plate 2; When not needing to take a sample, short circuit ground connection disconnecting link 7 closes.
At present, this high voltage capacitive-type equipment leakage current-resistance sampling sensor is used in the converting equipment on-line monitoring system of 4 transformer stations northeastward, has realized the isoparametric monitoring of dielectric loss angle tangent, electric capacity, leakage current, harmonic content to high voltage capacitive-type equipment (as sleeve pipe, current transformer, capacitance type potential transformer etc.).By field applications analysis more than 2 years, proved that the designed sensor antijamming capability of this inventive method is strong, can be good at bearing the impact of superpotential and excess current, overcome the punching current sensor and when sampling, had shortcomings such as angular difference and waveform distortion, reached the actual requirement of rig-site utilization.
Further specify with specific embodiment below:
Embodiment 1:
2008, having installed 45 in Dalian Wan Bao transformer station converting equipment on-line monitoring system altogether should the designed sampling detector of inventive method, has realized the sampling to the end screen leakage current of the complete 11 groups of 220kV current transformers of transformer station, 2 groups of 220kV bushings shell for transformer, 2 groups of 66kV bushings shell for transformer.
For current transformer, system has adopted the anchor ear mode that sensor and one of disconnecting link are held tightly on the shaft tower below the current transformer.And some high voltage capacitive-type equipments are not the supports of column type shaft tower, can not use anchor ear,, mainly utilize the existing screw of sensor outer housing so use support to fix, sensor is fixed on the support, entire bracket is being fixed on the appearance type equipment shaft tower then.No matter use which kind of mode fixation of sensor, the size of anchor ear and support and form all need the situation design according to the scene.
Provide the tabulation (Borland line B phase current mutual inductor) of insulating monitoring parameters such as the leakage current that in ten thousand precious Transformer Substation Online Monitoring System, obtained by the designed sensor application of this patent method, dielectric loss tangent below:
The absolute dielectric loss (%) of sampling time fundamental current (mA) capacitance (pF)
2009-8-17?22:29 33.50 850.22 0.26
2009-8-17?22:41 33.50 849.51 0.25
2009-8-17?22:54 33.58 849.51 0.24
2009-8-17?23:06 33.54 849.51 0.22
2009-8-17?23:19 33.61 849.51 0.22
2009-8-17?23:32 33.75 849.51 0.24
2009-8-17?23:44 33.86 850.23 0.22
2009-8-17?23:57 33.86 849.87 0.20
2009-8-18?0:10 33.77 850.22 0.25
2009-8-18?0:22 33.89 850.22 0.24
2009-8-18?0:35 34.00 850.94 0.26
2009-8-18?0:47 33.97 849.86 0.27
2009-8-18?1:00 34.02 850.22 0.25
2009-8-18?1:13 33.99 850.22 0.27
2009-8-18?1:25 34.03 849.86 0.28
2009-8-18?1:38 33.99 849.15 0.28
2009-8-18?1:50 33.95 849.15 0.26
2009-8-18?2:03 34.16 849.15 0.27
2009-8-18?2:16 33.98 849.86 0.26
2009-8-18?2:28 33.99 849.86 0.27
2009-8-18?2:41 34.08 849.86 0.27
2009-8-18?2:54 34.08 850.22 0.27
2009-8-18?3:06 34.10 850.22 0.25
2009-8-18?3:19 34.17 849.51 0.25
2009-8-18?3:31 34.13 849.86 0.26
2009-8-18?3:44 34.13 849.87 0.24
2009-8-18?3:57 34.16 850.22 0.28
2009-8-18?4:09 34.13 849.86 0.29
2009-8-18?4:22 34.13 849.86 0.27
2009-8-18?4:34 33.96 849.15 0.28
2009-8-18?4:47 34.03 849.86 0.27
2009-8-18?5:00 34.15 849.86 0.28
2009-8-18?5:12 34.07 849.15 0.26
2009-8-18?5:25 34.08 849.51 0.24
2009-8-18?5:38 33.97 849.87 0.25
Claims (4)
1. high voltage capacitive-type equipment leakage current-resistance sampling sensor, mainly comprise: a cast aluminium box shell (1) and a sample circuit plate (2), sample circuit plate (2) is fixed on cast aluminium box shell (1) inside, it is characterized in that sample circuit plate (2) is by high-power sampled resistance of wire wound (3) and holding circuit formation in parallel; The resistance rated power of the high-power sampled resistance of described wire wound (3) is higher 2～5 times than resistance actual motion power; Described holding circuit is composed in series by gas-discharge tube (4) and high-power wire-wound resistor (5); The alternative condition of gas-discharge tube (4) will satisfy: dc breakdown voltage is greater than the high-power sampled resistance both end voltage of wire wound:
The maximum impact electric current can bear the dash current that flows through capacitance type equipment; I
LBe leakage current.
2. a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor according to claim 1, it is characterized in that: three perforation are arranged at described cast aluminium box shell (1) bottom, wherein two perforation are by cable, and series connection sample circuit plate (2) is in screen loop, high voltage capacitive-type equipment end; Another root cable passes the 3rd perforation of cast aluminium box (1) bottom, connects the detecting unit (8) of sample circuit plate (2) and on-line monitoring or live line measurement system; There are two ear shape projectioies (9) at cast aluminium box shell (1) back, is used for shell is fixed to the shaft tower that needs to detect appearance type equipment.
3. a kind of high voltage capacitive-type equipment leakage current-resistance sampling sensor according to claim 1, it is characterized in that: the high-power sampled resistance of described wire wound (3) adopts axial lead, the resistance of its selection: select the resistance and the rated power of resistance: I according to dispatch from the factory leakage current that electric capacity and system's phase voltage calculation obtain of tested appearance type equipment
L=2 π fUC,
Wherein: I
LBe leakage current, f is a system frequency, U is system's phase voltage, C is an electric capacity, R is identical 2～3 the Wound-rotor type high-power resistances parallel connection of resistance, resistance rated power is higher 2～5 times than resistance actual motion power, if sensor application in on-line monitoring or live monitoring system, then the sample resistance value is than high 1～2 order of magnitude of conditioning resistance of signal condition part.
4. the installation method of a high voltage capacitive-type equipment leakage current-resistance sampling sensor as claimed in claim 1, it is characterized in that: this method may further comprise the steps: sample circuit plate (2) is fixed on cast aluminium box shell (1) inside; Two cables are connected with sample circuit plate (2) in the box by two perforation of cast aluminium box shell (1) bottom respectively, sample circuit plate (2) is connected in series in the screen loop, high voltage capacitive-type equipment end; Another root cable passes the 3rd perforation of cast aluminium box (1) bottom, and sample circuit plate (2) is linked to each other with the detecting unit (8) of on-line monitoring or live line measurement system; The loam cake that covers cast aluminium box shell (1) is also fixing; Steel band is passed two the ear shape bossings (9) and the disconnecting link (7) at cast aluminium box shell (1) back, and steel band is fixed on the high voltage capacitive-type equipment tower bar (6); Sample circuit plate (2) is in parallel with disconnecting link (7); When carrying out the leakage current signal sampling, disconnecting link (7) is drawn back the back obtain leakage current by sample circuit plate (2); When not needing to take a sample, short circuit ground connection disconnecting link (7) closes.
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| CN102495311A (en) * | 2011-11-30 | 2012-06-13 | 常州爱特科技有限公司 | End screen lead-out protection system |
| CN111540623A (en) * | 2020-04-28 | 2020-08-14 | 江苏图腾电气科技有限公司 | Assembly method of modular capacitor bank |
| CN116008863B (en) * | 2023-03-27 | 2023-06-02 | 云南华晟电力器材有限公司 | Electric iron tower electric leakage detection device with safeguard function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385339Y (en) * | 1999-07-09 | 2000-06-28 | 保定市霍尔电子有限公司 | Magnetic balancing current sensor for current measuring sampling |
| CN1580795A (en) * | 2004-05-17 | 2005-02-16 | 西安交通大学 | Capacitive power equipment medium loss on-line monitoring method and device |
| CN201489071U (en) * | 2009-08-19 | 2010-05-26 | 东北电力科学研究院有限公司 | Leakage current resistance sampling sensor for high voltage capacitive equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385339Y (en) * | 1999-07-09 | 2000-06-28 | 保定市霍尔电子有限公司 | Magnetic balancing current sensor for current measuring sampling |
| CN1580795A (en) * | 2004-05-17 | 2005-02-16 | 西安交通大学 | Capacitive power equipment medium loss on-line monitoring method and device |
| CN201489071U (en) * | 2009-08-19 | 2010-05-26 | 东北电力科学研究院有限公司 | Leakage current resistance sampling sensor for high voltage capacitive equipment |
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Owner name: LIAONING DONGKE ELECTRIC POWER CO., LTD. Free format text: FORMER OWNER: NORTHEAST ELECTRIC POWER RESEARCH INSTITUTE CO., LTD. Effective date: 20111122 Free format text: FORMER OWNER: LIAONING DONGKE ELECTRIC POWER CO., LTD. |
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Effective date of registration: 20111122 Address after: Hunnan New Fruit street Shenyang city Liaoning province 110179 No. 3-1 Patentee after: Liaoning Dongke Power Co., Ltd. Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Co-patentee before: Liaoning Dongke Power Co., Ltd. Patentee before: Northeast Electric Power Research Institute Co., Ltd. |