CN105137152A - Ground lead current signal monitoring sensor for end screen of transformer bushing - Google Patents
Ground lead current signal monitoring sensor for end screen of transformer bushing Download PDFInfo
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- CN105137152A CN105137152A CN201510515525.3A CN201510515525A CN105137152A CN 105137152 A CN105137152 A CN 105137152A CN 201510515525 A CN201510515525 A CN 201510515525A CN 105137152 A CN105137152 A CN 105137152A
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Abstract
The invention provides a ground lead current signal monitoring sensor for an end screen of transformer bushing. The ground lead current signal monitoring sensor comprises a conducting rod 1, a pedestal 2, a bottom waterproof sealing ring 3, a coil 4, a coil 5, a coil 6, a housing 7, a waterproof cap 8, a conductive disk 9, a top waterproof sealing ring 10, a BNC contact 11, a BNC contact 12, and a BNC contact 13, wherein the coil 4, the coil 5 and the coil 6 sleeve the conducting rod 1 side by side, and shares the housing 7; the conducting rod 1 is cylindrical; the housing 7 is cylinder-shaped; the conducting rod 1 and the housing 7 form a coaxial cylinder structure; and the pedestal 2 is a cylinder, and the pedestal 2 and the conducting rod 1 forms a coaxial cylinder structure. The ground lead current signal monitoring sensor for an end screen of transformer bushing can transmit high frequency signals in the 1MHz-40MHz scope without distortion, and is small in volume and high in adaptability.
Description
Technical field
The invention belongs to bushing shell for transformer on-line monitoring field in electric system, relate to a kind of Transformer Bushing Tap ground wire current signal monitoring sensor.
Background technology
Bushing shell for transformer failure rate is higher, and therefore bushing shell for transformer on-line monitoring is extremely important.Usually, bushing shell for transformer monitoring variable comprises dielectric loss angle tangent tg δ, sleeve pipe partial discharge quantity.During monitoring above-mentioned parameter, all need obtain current signal from Transformer Bushing Tap extension line.
1) monitoring of bushing shell for transformer dielectric loss angle tangent tg δ
The dielectric loss angle tangent tg δ value reflection sleeve pipe humidified insulation situation of sleeve pipe, δ angle is the power frequency Leakage Current on bottom shielding of bushing extension line and the angle between the power-frequency voltage signal on casing high pressure guide rod, very small.The on-line monitoring of bushing shell for transformer power frequency Leakage Current belongs to high voltage, micro-electric current, low-angle precision measurement category, and the phase angle difference of current sensor used is the major influence factors affecting tg δ measuring accuracy and stability.
2) partial discharge monitoring of bushing shell for transformer
Bushing shell for transformer more than 110kV electric pressure is based on Oil-impregnated Paper Condenser Bushing in History, and in manufacture and During Process of Long-term Operation, sleeve pipe because the defect generation partial discharge phenomenon of insulation system, can destroy the insulation of sleeve pipe thus gradually.For grasping insulation property of transformer sleeve and insulating inner discharge severity, carrying out partial discharge monitoring by Transformer Bushing Tap ground wire and to be absolutely necessary one of means.Bushing shell for transformer local discharge signal frequency mainly concentrates on 20KHz-40MHz, for grasping sleeve pipe shelf depreciation information, needs current sensor to have wide frequency band measurement scope, to extract abundant local discharge signal feature.Equally, current sensor need be enclosed within the ground wire that is connected with bottom shielding of bushing extension line.
3) transformer superpotential invasion ripple monitoring
When transformer suffers lightning wave or switching overvoltage attacks, inside transformer insulation weak link may be destroyed, and Transformer Winding may deform.Therefore, grasping the situation of the superpotential impact that transformer suffers, is requisite part in transformer state diagnosis.When superpotential invasion transformer, bottom shielding of bushing extension line can flow through the capacity current because superpotential produces.According to the capacitive effect of sleeve pipe, this current signal is the differential of overvoltage signal.This current signal of Measurement accuracy, integration, can obtain overvoltage signal.Wherein, lightning surge signal frequency range mainly concentrates on 1K-1MHz, and the electric current maximum amplitude flowing through Transformer Bushing Tap ground wire can reach 1000A, and the current sensor of monitoring lightning surge signal needs monitor low frequency signal and bear heavy current impact.At present, owing to lacking measurement technology, the waveform of power network overvoltage must rely on simulation calculation to obtain, and error is very large, is unfavorable for the state diagnosing transformer.
4) existing Transformer Bushing Tap extension line current monitoring Problems existing
During transformer normally runs, the necessary reliable ground of bottom shielding of bushing extension line, therefore bottom shielding of bushing extension line is often protected and ground connection by rainhat.When carrying out sleeve pipe insulation state monitoring, first field staff stops transport transformer usually, the rainhat of bottom shielding of bushing extension line is opened, the ground wire that connection one is long on end shield extension line, and be connected on transformer case by the other end of ground wire, then end shield extension line is through this ground wire reliable ground; Current sensor is then enclosed within this ground wire.After monitoring, then removal sensor, restore rainhat; Or adopt complicated additional packoff to guarantee grounding wire connector not corrosion, complex structure.
The ground wire additional due to this is arbitrarily put, different in size, and thus the inductance of ground wire itself changes thereupon, and then causes current sensor to the measuring error of the current signal on end shield extension line.For power frequency Leakage Current signal, because ground wire always can not be in the center of current sensor, and arbitrarily bend, the phase error caused can not meet the precise requirements that tg δ measures.For pulse current of PD signal, owing to being non-coaxial column structure between ground wire and transformer case, causing the frequency band of ground wire wide not, have distortion to high frequency (more than 1MHz) signal.
Meanwhile, existing current sensor volume is large, adds the overall volume of current monitoring device.To the transformer of 110kV and above thereof, consider the impact of the edge flashing voltage on bushing shell for transformer, large size electro flow sensor needs to install monitoring away from sleeve pipe, even can not accept by field staff, and then cannot be practical.In addition, there is the position that two need sealing, that is, two of ground wire in the mode installing ground wire at end shield extension line additional, thus higher to the requirement of hermetically-sealed construction.
Summary of the invention
Content of the present invention proposes a kind of Transformer Bushing Tap ground wire current signal monitoring sensor, it is characterized in that: this sensor is made up of conducting rod 1, base 2, bottom waterproof grommet 3, coil 4, coil 5, coil 6, shell 7, tarpaulin 8, conductive disc 9, top waterproof grommet 10, BNC connector 11, BNC connector 12, BNC connector 13; Conducting rod 1 is cylindrical, and shell 7 is cylindrical shape, and both form concentric cylinder structure; Base 2 is right cylinder, forms concentric cylinder structure with conducting rod; Waterproof grommet 3,10 is arranged respectively at bottom shell 7 and top, and tarpaulin 8 is arranged on shell 7 top, and current sensor inside is by poured with epoxy resin embedding; Conducting rod 1 and base 2 are detachably changed.
The object of the present invention is to provide a kind of Transformer Bushing Tap ground wire current signal monitoring sensor, shell 7, base 2 and conducting rod 1 form concentric cylinder structure, can undistorted transmission 45Hz-55Hz power frequency Leakage Current signal, the local discharge signal of 20KHz-40MHz, the overvoltage signal of 1K-2MHz, frequency band range 45Hz-40MHz.Encapsulation process has been carried out at bottom shielding of bushing extension line two ends, can prevent bottom shielding of bushing interface from intaking.Sensor and end shield interface coupling portion and end shield cylinder coaxial extractor line can dismounting and change, can adapt to the end shield of different size.
The invention has the advantages that:
(1) conducting rod 1 is cylindrical, and shell 7 is cylindrical shape, and both form concentric cylinder structure; Base 2 is right cylinder, also forms concentric cylinder structure with conducting rod 1.Then sensor can undistorted power frequency Leakage Current signal, the local discharge signal of 20KHz-40MHz, the overvoltage signal of 1K-2MHz transmitting 45Hz-55Hz.
(2) conducting rod 1 two ends and sensor internal have carried out waterproof sealing process, can prevent bottom shielding of bushing interface and sensor internal water inlet.
(3) conducting rod 1 and base 2 are detachably replaced by different size, and be applicable to the bottom shielding of bushing extension line interface of different size, make sensor easy for installation, end shield extension line ground connection is reliable.
Accompanying drawing explanation
Fig. 1 is sensor diagrammatic cross-section of the present invention.
Embodiment
The present invention is described further for composition graphs 1.
As shown in Figure 1, a kind of Transformer Bushing Tap ground wire current signal monitoring sensor, on the whole aobvious concentric cylinder structure.Electric current enters conducting rod 1 from bottom shielding of bushing extension line, shell 7 and sensor firm banking 2 is flowed into by conductive disc 9, finally along the grounded part of base 2 inflow transformer bottom shielding of bushing extension line interface, the loop that conducting rod and conductive disc 9, shell 7 and base 2 are formed has the frequency band up to 100MHz, is convenient to also measure local discharge signal in the broad frequency range of 20KHz-40MHz.Coil 4, coil 5 and coil 6 are circular, are enclosed within side by side on conducting rod 1, and it is inner to be in shell 7, then conducting rod 1 is on the axis of sensor center, has ensured the accuracy at the phasing degree that power frequency Leakage Current is measured; Coil 4, coil 5 and coil 6 shares a shell 7, shares a conducting rod 1, makes overall sensor size little, and can monitor invasion wave impact current signal, local discharge signal and power frequency Leakage Current signal simultaneously, has multi-functional.
The diameter of conducting rod 1 and base 2 is depending on the diameter of Transformer Bushing Tap extension line interface, detachable replacing, and then be convenient to the bottom shielding of bushing extension line Interference fit with different-diameter, and other parts of sensor (such as, coil 4, coil 5, coil 6, shell 7, conductive disc 9, tarpaulin 8) can remain unchanged.
Base 2 is installed fixing by internal thread and Transformer Bushing Tap extension line Interference fit; Bottom shell 7 and top adds waterproof grommet 3,10; Shell 7 is by bottom screw firm banking 2; Conducting rod 1 penetrates from center sensor, and is connected with Transformer Bushing Tap tap; Again conductive disc 9 is screwed in from conducting rod 1 top, and contact with sensor outer housing, by screw, conductive disc 9 and shell 7 are connected and fixed, complete installation.
In the present embodiment:
Conducting rod 1 is a cylindrical bar, and be highly 97mm, maximum gauge is 12mm; Base 2 is highly 28mm, and maximum gauge is 68mm; Shell 7 is cylinders, and be highly 72mm, maximum gauge is 72mm; Conductive disc 9 is disks, and be highly 5mm, diameter is 36mm.
Coil 4 number of turn is 80 circles, and integrating resistor is 0.5 Ω, and Observational frequency band is 1KHz-2MHz, and for monitoring dash current signal, signal exports from BNC connector 13; Coil 5 number of turn is 30 circles, and integrating resistor is 50 Ω, and Observational frequency band is 20KHz-40MHz, and for monitoring local discharge signal, signal exports from BNC connector 12; Coil 6 number of turn is 150 circles, and integrating resistor is 20 Ω, and Observational frequency band is 45Hz-55Hz, and for monitoring power frequency Leakage Current, signal exports from BNC connector 11.
Base 2, shell 7, tarpaulin 8, conductive disc 9 adopt conductivity to be 9.71x10
-8the iron material of Ω m zinc-plated process.Conducting rod 1 adopts conductivity to be 1.678x10
-8the copper material of Ω m.The non-crystalline material that the core material of coil 4, coil 5 and coil 6 adopts relative permeability to be greater than 10000.The material of bottom waterproof grommet 3 and top waterproof grommet 10 is fluororubber material.
Claims (4)
1. a Transformer Bushing Tap ground wire current signal monitoring sensor, is characterized in that: this sensor is made up of (as shown in Figure 1) conducting rod 1, base 2, bottom waterproof grommet 3, coil 4, coil 5, coil 6, shell 7, tarpaulin 8, conductive disc 9, top waterproof grommet 10, BNC connector 11, BNC connector 12, BNC connector 13.
2. Transformer Bushing Tap ground wire current signal monitoring sensor according to claim 1, is characterized in that: conducting rod 1 is for cylindrical, and shell 7 is cylindrical shape, and both form concentric cylinder structure; Base 2 is right cylinder, forms concentric cylinder structure with conducting rod.
3. Transformer Bushing Tap ground wire current signal monitoring sensor according to claim 2, it is characterized in that: waterproof grommet 3,10 is arranged respectively at bottom shell 7 and top, tarpaulin 8 is arranged on shell 7 top, and current sensor inside is by poured with epoxy resin embedding.
4. Transformer Bushing Tap ground wire current signal monitoring sensor according to claim 3, is characterized in that: conducting rod 1 and base 2 are detachably changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510515525.3A CN105137152A (en) | 2015-08-21 | 2015-08-21 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510515525.3A CN105137152A (en) | 2015-08-21 | 2015-08-21 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
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| CN105137152A true CN105137152A (en) | 2015-12-09 |
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| CN201510515525.3A Pending CN105137152A (en) | 2015-08-21 | 2015-08-21 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841869A (en) * | 2017-02-13 | 2017-06-13 | 河北智恒电力科技有限公司 | Bushing sensor and its test method |
| CN107422231A (en) * | 2017-06-14 | 2017-12-01 | 西安交通大学 | A kind of transformer superfrequency local discharge detection device |
| CN107464654A (en) * | 2017-09-27 | 2017-12-12 | 广州赛宝计量检测中心服务有限公司 | A kind of broadband high stable inductor in high frequency |
| CN107589356A (en) * | 2017-10-19 | 2018-01-16 | 桂林师范高等专科学校 | Transformer insulated property detection means |
| CN107807311A (en) * | 2017-09-26 | 2018-03-16 | 杭州西湖电子研究所 | A kind of capacitive sleeve pipe high frequency partial discharge signal detection device |
| CN107831410A (en) * | 2017-09-26 | 2018-03-23 | 杭州西湖电子研究所 | A kind of capacitive bottom shielding of bushing signal supervisory instrument |
| CN108565101A (en) * | 2018-03-30 | 2018-09-21 | 中国人民解放军国防科技大学 | All-solid-state light 100 kV-level pulse transformer and manufacturing method thereof |
| CN108710005A (en) * | 2018-06-12 | 2018-10-26 | 广州供电局有限公司 | Dielectric loss partial discharge sensor structure and capacitive high-voltage electrical equipment testing agency |
| CN109448971A (en) * | 2018-12-11 | 2019-03-08 | 国网山西省电力公司临汾供电公司 | Distribution transforming connector is quickly disconnected for distribution transformer |
| CN110196350A (en) * | 2019-05-17 | 2019-09-03 | 国网陕西省电力公司电力科学研究院 | Bottom shielding of bushing earthing or grounding means, leakage current collection system and method |
| RU195641U1 (en) * | 2019-09-17 | 2020-02-03 | Акционерное общество энергетики и электрификации "Тюменьэнерго" (АО "Тюменьэнерго") | Device for monitoring the state of insulation of a high voltage input |
| CN112731075A (en) * | 2020-12-17 | 2021-04-30 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent sleeve with integrated structure built in sensor |
| CN113109654A (en) * | 2021-04-15 | 2021-07-13 | 广东电网有限责任公司 | Wiring sleeve and switch cabinet |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
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| CN203630191U (en) * | 2013-10-26 | 2014-06-04 | 国家电网公司 | Current sampling device used for transformer bushing end screen |
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| CN202583336U (en) * | 2011-12-05 | 2012-12-05 | 宁波理工监测科技股份有限公司 | Transformer end screen grounding detection device |
| CN102540034A (en) * | 2012-03-16 | 2012-07-04 | 甘肃电力科学研究院 | High-voltage transformer bushing tap grounding on-line monitoring device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841869A (en) * | 2017-02-13 | 2017-06-13 | 河北智恒电力科技有限公司 | Bushing sensor and its test method |
| CN107422231A (en) * | 2017-06-14 | 2017-12-01 | 西安交通大学 | A kind of transformer superfrequency local discharge detection device |
| CN107807311A (en) * | 2017-09-26 | 2018-03-16 | 杭州西湖电子研究所 | A kind of capacitive sleeve pipe high frequency partial discharge signal detection device |
| CN107831410A (en) * | 2017-09-26 | 2018-03-23 | 杭州西湖电子研究所 | A kind of capacitive bottom shielding of bushing signal supervisory instrument |
| CN107464654A (en) * | 2017-09-27 | 2017-12-12 | 广州赛宝计量检测中心服务有限公司 | A kind of broadband high stable inductor in high frequency |
| CN107589356A (en) * | 2017-10-19 | 2018-01-16 | 桂林师范高等专科学校 | Transformer insulated property detection means |
| CN108565101A (en) * | 2018-03-30 | 2018-09-21 | 中国人民解放军国防科技大学 | All-solid-state light 100 kV-level pulse transformer and manufacturing method thereof |
| CN108710005A (en) * | 2018-06-12 | 2018-10-26 | 广州供电局有限公司 | Dielectric loss partial discharge sensor structure and capacitive high-voltage electrical equipment testing agency |
| CN109448971A (en) * | 2018-12-11 | 2019-03-08 | 国网山西省电力公司临汾供电公司 | Distribution transforming connector is quickly disconnected for distribution transformer |
| CN109448971B (en) * | 2018-12-11 | 2024-02-06 | 国网山西省电力公司临汾供电公司 | Quick-dismantling and assembling transformer joint for distribution transformer |
| CN110196350A (en) * | 2019-05-17 | 2019-09-03 | 国网陕西省电力公司电力科学研究院 | Bottom shielding of bushing earthing or grounding means, leakage current collection system and method |
| RU195641U1 (en) * | 2019-09-17 | 2020-02-03 | Акционерное общество энергетики и электрификации "Тюменьэнерго" (АО "Тюменьэнерго") | Device for monitoring the state of insulation of a high voltage input |
| CN112731075A (en) * | 2020-12-17 | 2021-04-30 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent sleeve with integrated structure built in sensor |
| CN112731075B (en) * | 2020-12-17 | 2022-04-29 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent sleeve with integrated structure built in sensor |
| CN113109654A (en) * | 2021-04-15 | 2021-07-13 | 广东电网有限责任公司 | Wiring sleeve and switch cabinet |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
| CN114167184B (en) * | 2021-12-06 | 2024-01-23 | 国网新疆电力有限公司电力科学研究院 | Sleeve and transformer end screen online monitoring networking system and method based on Internet of things |
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