CN104502821B - Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method - Google Patents

Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method Download PDF

Info

Publication number
CN104502821B
CN104502821B CN201410837141.9A CN201410837141A CN104502821B CN 104502821 B CN104502821 B CN 104502821B CN 201410837141 A CN201410837141 A CN 201410837141A CN 104502821 B CN104502821 B CN 104502821B
Authority
CN
China
Prior art keywords
circuit
phases
partial discharge
phase
capacitance sensor
Prior art date
Application number
CN201410837141.9A
Other languages
Chinese (zh)
Other versions
CN104502821A (en
Inventor
宋佳佳
张金波
张博
Original Assignee
河海大学常州校区
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 河海大学常州校区 filed Critical 河海大学常州校区
Priority to CN201410837141.9A priority Critical patent/CN104502821B/en
Publication of CN104502821A publication Critical patent/CN104502821A/en
Application granted granted Critical
Publication of CN104502821B publication Critical patent/CN104502821B/en

Links

Abstract

The invention discloses one kind to be based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method, including A phase induction types capacitance sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, the powered display circuit of A phases, the powered display circuit of B phases, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;Using induction type capacitance sensor, potential indicator nuclear phase hole takes partial discharge monitoring signals from switch cubicle, judge that switch cubicle produces partial discharge degree using pulse current method and Spectrum Method, realize the on-line monitoring of switch cabinet partial discharge, so that the acquisition of Partial discharge signal becomes simple and easy, and measuring instrument installation is simple, cost is low, it is not necessary to high sensor, is easy to partial discharge on-line monitoring to promote.

Description

Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method
Technical field
The present invention relates to one kind to be based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method, belongs to electric power skill Art field.
Background technology
In recent years, switch cubicle application is more and more wider in power system, the deficiency of switch cubicle field testing procedure and puts into operation Electric power accident quantity caused by the deterioration of switch cubicle insulation characterisitic rises year by year, and serious threat the safe operation of power system, most Power supply quality and power supply reliability are influenceed eventually.
According to statistics, cause in the factor that switch cubicle insulation characterisitic deteriorates, the deterioration as caused by shelf depreciation accounts for 85%.Cause How this, effectively find the shelf depreciation of switch cubicle, detects that potential insulation fault turns into power monitoring department increasingly in time It is concerned about simultaneously urgent problem to be solved, and currently associated mechanism and the focus of scientific and technical personnel's research.
In switch cubicle insulation system, the electric-field intensity at each position has differences, and the electric-field intensity in some region once reaches During to its disruptive field intensity, the region will Discharge Phenomena, but through whole between applying alive two conductors Discharge process, that is, discharge and do not puncture insulation system, this phenomenon is shelf depreciation.
Shelf depreciation is a kind of pulse phenomenon, and the process of shelf depreciation is except the transfer and the loss of electric energy along with electric charge Outside, it can also produce electromagnetic radiation, ultrasound, light, generate heat and occur new product etc..Ultrasonic measurement and transient state low-voltage Measure the measurement method for being namely based on these attendant phenomenons and summing up.
Transient state low-voltage method:In order to reduce equipment size, make structure compacter, switch cubicle manufacturing firm is switching at present Substantial amounts of insulating materials is employed in the manufacture of cabinet, CT, PT, stationary contact head cartridge, wall bushing such as poured with epoxy resin and alternate Dividing plate etc., if shelf depreciation be present inside these insulating materials, influenceed by skin effect, often instrument concentrates on current traveling wave The inner surface of metal cabinet, without being directed through metal cabinet, the seam crossing or gas-insulated that fraction passes through metal shell The pad of switch blazes abroad, while produces an instantaneous voltage-to-ground, passes to ground by the metal shell outer surface of equipment Go down.The change of transient state voltage-to-ground can induce high frequency electric on the metal polar plate of sensor on switch cabinet shell body, to passing The high frequency electric of sensor output is handled, and can obtain the intensity and frequency of shelf depreciation indirectly.This detection method is to arteries and veins The pace of change of punching is more sensitive, is relatively adapted to the electric discharge of detection media interior.
Because electric discharge is moment, therefore partial discharge waveform is the pulse of a single, after electric discharge terminates, due to impurity electricity The charge and discharge electro ultrafiltration of appearance, the vibration that waveform can pass through short time tend to be flat again, propose that one kind is based on electric capacity for this present invention Sensor type switch cabinet partial discharge on-line monitoring system, the system uses obtains partial discharge letter at switch cabinet electrified indicator nuclear phase hole Number, as long as partial discharge phenomenon occurs for a certain phase in switch cubicle, capacitance sensor will be coupled out partial discharge discharge current signal, pass through core Phase hole can takes out the partial discharge discharge current signal of coupling indirectly, and now discharge pulse occurs in discharge current, utilizes pulse Current method, and current spectrum method is combined, it can be diagnosed to be whether this mutually occurs partial discharge exactly, and the degree of partial discharge occurs, A kind of Novel switch cabinet partial discharge on-Line Monitor Device feature is:So that the acquisition of Partial discharge signal becomes simple and easy, and measuring instrument Device installation is simple, cost is low, it is not necessary to high sensor, is easy to partial discharge on-line monitoring to promote.
The content of the invention
The technical problems to be solved by the invention are, how using induction type capacitance sensor, the powered finger from switch cubicle Show that device nuclear phase hole takes partial discharge monitoring signals, judge that switch cubicle produces partial discharge degree using pulse current method and Spectrum Method, realization is opened The on-line monitoring of cabinet partial discharge is closed, to ensure that switch cubicle health and safety are run.
In order to solve the above technical problems, monitored on-line the invention provides one kind based on capacitance sensor type switch cabinet partial discharge System, including A phase induction types capacitance sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, A phases are powered Display circuit, the powered display circuit of B phases, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;The A phases are felt Formula capacitance sensor, B phase induction types capacitance sensor, C phase induction type capacitance sensors is answered to be installed in switch cabinet outlet end, A Phase induction type capacitance sensor, B phase induction types capacitance sensor, C phase induction type capacitance sensors output end respectively with A facies tracts The input connection of electric display circuit, the powered display circuit of B phases, the powered display circuit of C phases, the powered display circuit of A phases, B facies tracts Electric display circuit, the powered display circuit of C phases are arranged on the cabinet door-plate of switch cubicle;The powered display circuit of the A phases, B facies tracts Electric display circuit, the nuclear phase hole of the powered display circuit of C phases are connected with concentrated collection device input respectively, and concentrated collection device is arranged on On the cabinet door-plate of switch cubicle;The concentrated collection device is transmitted data by wired or wireless way with cloud service Surveillance center and believed Breath, the cloud service Surveillance center are received and come from concentrated collection device partial discharge data, and the data of reception are analyzed, store, united Meter, draws partial discharge spectrum curve, forms all kinds of statistical report forms.
Above-mentioned concentrated collection device includes A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit, deposited Storing up electricity road, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock circuit, communication interface Circuit;Partial discharge signal in the A phase signals modulate circuit is derived from A phase nuclear phases hole;Partial discharge signal in B phase signals modulate circuits It is derived from B phase nuclear phases hole;Partial discharge signal in C phase signals modulate circuits is derived from C phase nuclear phases hole;The A phase signals modulate circuit, B The input of phase signals modulate circuit, the output end of C phase signals modulate circuits respectively with high speed microprocessor circuit is connected;Storage The output end of circuit is connected with the I/O mouths of high speed microprocessor circuit;The input of display circuit and high speed microprocessor circuit I/O mouths connection;The input of warning circuit is connected with the I/O mouths of high speed microprocessor circuit;The output end of keyboard circuit with The I/O mouths connection of high speed microprocessor circuit;The output end of clock circuit is connected with the I/O mouths of high speed microprocessor circuit;Electricity The output end of source circuit is connected with the power end of high speed microprocessor circuit;Communication interface circuit and high speed microprocessor circuit Port connects.
Above-mentioned display circuit includes electrification indicating circuit and A phase nuclear phases hole on powered display circuit, B phase nuclear phases Hole, C phase nuclear phases hole, only need to be by inside three corresponding nuclear phase holes of measurement terminals insertion during measurement, so that it may obtain the partial discharge of tested phase Current signal, due to being mounted on display circuit on switch cubicle, induction type capacitance sensor is as standard configuration device, so in office Induction type capacitance sensor need not be separately installed when putting monitoring, the partial discharge letter of collection is directly obtained from display circuit nuclear phase hole Number.
One kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, as follows using above-mentioned system, step:
(1), high speed microprocessor circuit the partial discharge information collected is handled using induction type capacitance sensor, obtain Obtain the pulse current and pulse current spectrogram when partial discharge occurs;
(2), according to caused by whether pulse current method and pulse current Spectrum Method comprehensive descision occur partial discharge and partial discharge Degree;
(3), when in switch cubicle somewhere occur partial discharge when, to low potential point produce continuous discharge phenomenon, so make originally mark Accurate sinusoidal current signal is distorted, and is formed pulse current, and the current signal containing different frequency in electric current, is passed through analysis Spectrogram frequency range, so that it may determine degree caused by inside switch cabinet partial discharge indirectly.
This kind of method directly obtains partial discharge measurement signal in the alive circuit nuclear phase hole due to utilizing high-tension switch cabinet installation, With installing, simple, cost is low, it is not necessary to high sensor, the promotion and application for being easy to partial discharge to monitor on-line.
The beneficial effect that the present invention is reached:
System combines the actual conditions of China's switch cabinet partial discharge monitoring, using induction type capacitance sensor, from switch cubicle Upper potential indicator nuclear phase hole takes partial discharge monitoring signals, judges that switch cubicle produces partial discharge journey using pulse current method and Spectrum Method Degree, realize the on-line monitoring of switch cabinet partial discharge so that the acquisition of Partial discharge signal becomes simple and easy, and measuring instrument installation letter List, cost are low, it is not necessary to high sensor, are easy to partial discharge on-line monitoring to promote.
Brief description of the drawings
Fig. 1 is the structural representation of present system;
Fig. 2 is the structural representation of concentrated collection device in Fig. 1.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, a kind of be based on capacitance sensor type switch cabinet partial discharge on-line monitoring system, including A phases induction type electricity Hold sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, the powered display circuit of A phases, the powered display of B phases Circuit, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;The A phases induction type capacitance sensor, B phases are felt Formula capacitance sensor, C phase induction type capacitance sensors is answered to be installed in switch cabinet outlet end, A phase induction types capacitance sensor, B Phase induction type capacitance sensor, display circuit powered with A phases, B phases are powered aobvious respectively for the output end of C phase induction type capacitance sensors Show the input connection of circuit, the powered display circuit of C phases, the powered display circuit of A phases, the powered display circuit of B phases, C phases are powered aobvious Show that circuit is arranged on the cabinet door-plate of switch cubicle;The powered display circuit of the A phases, the powered display circuit of B phases, C phases are powered aobvious Show that the nuclear phase hole of circuit is connected with concentrated collection device input respectively, concentrated collection device is arranged on the cabinet door-plate of switch cubicle; The concentrated collection device and cloud service Surveillance center are by wired or wireless way transfer data information, in the cloud service monitoring The heart is received and comes from concentrated collection device partial discharge data, and the data of reception are analyzed, store, counted, draw partial discharge spectrum curve, Form all kinds of statistical report forms.
Adjusted as shown in Fig. 2 above-mentioned concentrated collection device includes A phase signals modulate circuit, B phase signals modulate circuit, C phase signals Manage circuit, storage circuit, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock electricity Road, communication interface circuit;Partial discharge signal in the A phase signals modulate circuit is derived from A phase nuclear phases hole;B phase signals modulate circuits In Partial discharge signal be derived from B phase nuclear phases hole;Partial discharge signal in C phase signals modulate circuits is derived from C phase nuclear phases hole;The A believes Number modulate circuit, B phase signals modulate circuit, the output end of C phase signals modulate circuits are defeated with high speed microprocessor circuit respectively Enter end connection;The output end of storage circuit is connected with the I/O mouths of high speed microprocessor circuit;The input of display circuit and high speed The I/O mouths connection of microcontroller circuit;The input of warning circuit is connected with the I/O mouths of high speed microprocessor circuit;Keyboard electricity The output end on road is connected with the I/O mouths of high speed microprocessor circuit;The output end of clock circuit and high speed microprocessor circuit I/O mouths connect;The output end of power circuit is connected with the power end of high speed microprocessor circuit;Communication interface circuit is micro- with high speed The port connection of processor circuit.
Above-mentioned display circuit includes electrification indicating circuit and A phase nuclear phases hole on powered display circuit, B phase nuclear phases Hole, C phase nuclear phases hole, only need to be by inside three corresponding nuclear phase holes of measurement terminals insertion during measurement, so that it may obtain the partial discharge of tested phase Current signal, due to being mounted on display circuit on switch cubicle, induction type capacitance sensor is as standard configuration device, so in office Induction type capacitance sensor need not be separately installed when putting monitoring, the partial discharge letter of collection is directly obtained from display circuit nuclear phase hole Number.
One kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, as follows using above-mentioned system, step:
(1), high speed microprocessor circuit the partial discharge information collected is handled using induction type capacitance sensor, obtain Obtain the pulse current and pulse current spectrogram when partial discharge occurs;
(2), according to caused by whether pulse current method and pulse current Spectrum Method comprehensive descision occur partial discharge and partial discharge Degree;
(3), when in switch cubicle somewhere occur partial discharge when, to low potential point produce continuous discharge phenomenon, so make originally mark Accurate sinusoidal current signal is distorted, and is formed pulse current, and the current signal containing different frequency in electric current, is passed through analysis Spectrogram frequency range, so that it may determine degree caused by inside switch cabinet partial discharge indirectly.
This kind of method directly obtains partial discharge measurement signal in the alive circuit nuclear phase hole due to utilizing high-tension switch cabinet installation, With installing, simple, cost is low, it is not necessary to high sensor, the promotion and application for being easy to partial discharge to monitor on-line.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation Also it should be regarded as protection scope of the present invention.

Claims (2)

1. one kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring system, it is characterised in that:Including A phase induction type electric capacity The powered display electricity of sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, the powered display circuit of A phases, B phases Road, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;The A phases induction type capacitance sensor, B phases sense Formula capacitance sensor, C phase induction type capacitance sensors are installed in switch cabinet outlet end, A phase induction types capacitance sensor, B phases Output end display circuit powered with A phases, the powered display of B phases respectively of induction type capacitance sensor, C phase induction type capacitance sensors The input connection of circuit, the powered display circuit of C phases, the powered display circuit of A phases, the powered display circuit of B phases, the powered display of C phases Circuit is arranged on the cabinet door-plate of switch cubicle;The powered display circuit of the A phases, the powered display circuit of B phases, the powered display of C phases The nuclear phase hole of circuit is connected with concentrated collection device input respectively, and concentrated collection device is arranged on the cabinet door-plate of switch cubicle;Institute State concentrated collection device and pass through wired or wireless way transfer data information, the cloud service Surveillance center with cloud service Surveillance center Reception comes from concentrated collection device partial discharge data, and the data of reception are analyzed, store, counted, draw partial discharge spectrum curve, shape Into all kinds of statistical report forms;
The concentrated collection device includes A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit, storage electricity Road, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock circuit, communication interface electricity Road;Partial discharge signal in the A phase signals modulate circuit is derived from A phase nuclear phases hole;Partial discharge signal in B phase signals modulate circuits takes From B phase nuclear phases hole;Partial discharge signal in C phase signals modulate circuits is derived from C phase nuclear phases hole;The A phase signals modulate circuit, B phases The input of signal conditioning circuit, the output end of C phase signals modulate circuits respectively with high speed microprocessor circuit is connected;Storage electricity The output end on road is connected with the I/O mouths of high speed microprocessor circuit;The input of display circuit and high speed microprocessor circuit I/O mouths connect;The input of warning circuit is connected with the I/O mouths of high speed microprocessor circuit;The output end of keyboard circuit and height The I/O mouths connection of fast microcontroller circuit;The output end of clock circuit is connected with the I/O mouths of high speed microprocessor circuit;Power supply The output end of circuit is connected with the power end of high speed microprocessor circuit;Communication interface circuit is logical with high speed microprocessor circuit Casually connect;
Display circuit in the concentrated collection device includes powered display circuit and the A phase nuclear phases on powered display circuit Hole, B phase nuclear phases hole, C phase nuclear phases hole, only need to be by inside three corresponding nuclear phase holes of measurement terminals insertion during measurement, so that it may obtain quilt The partial discharge current signal of phase is surveyed, due to being mounted on display circuit on switch cubicle, induction type capacitance sensor is as standard configuration device Part, induction type capacitance sensor so need not be separately installed when partial discharge monitors, directly be obtained from display circuit nuclear phase hole The Partial discharge signal of collection.
2. one kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, it is characterised in that using described in claim 1 System, step is as follows:
(1), high speed microprocessor circuit the partial discharge information collected is handled using induction type capacitance sensor, acquisition office Put the pulse current and pulse current spectrogram during generation;
(2), according to caused by whether pulse current method and pulse current Spectrum Method comprehensive descision occur partial discharge and partial discharge degree;
(3), when in switch cubicle somewhere occur partial discharge when, to low potential point produce continuous discharge phenomenon, so make script standard Sinusoidal current signal is distorted, and is formed pulse current, and the current signal containing different frequency in electric current, is passed through analysis spectrum Figure frequency range, so that it may determine degree caused by inside switch cabinet partial discharge indirectly.
CN201410837141.9A 2014-12-29 2014-12-29 Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method CN104502821B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410837141.9A CN104502821B (en) 2014-12-29 2014-12-29 Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410837141.9A CN104502821B (en) 2014-12-29 2014-12-29 Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method

Publications (2)

Publication Number Publication Date
CN104502821A CN104502821A (en) 2015-04-08
CN104502821B true CN104502821B (en) 2018-03-20

Family

ID=52944232

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410837141.9A CN104502821B (en) 2014-12-29 2014-12-29 Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method

Country Status (1)

Country Link
CN (1) CN104502821B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106814290B (en) * 2015-12-02 2019-11-08 中国电力科学研究院 A kind of 10kV switch cabinet state detection method
CN105372059B (en) * 2015-12-15 2018-07-27 河海大学常州校区 High voltage isolator mechanical property on-Line Monitor Device and its monitoring method
CN107271862A (en) * 2017-06-15 2017-10-20 国网河南省电力公司济源供电公司 A kind of high-tension switch cabinet partial discharge monitoring device
CN108427068A (en) * 2018-03-29 2018-08-21 云南电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear detection device and method
CN108445360A (en) * 2018-03-29 2018-08-24 云南电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear positioning device and method
CN109633395A (en) * 2019-01-24 2019-04-16 保定华创电气有限公司 A kind of measurement of local discharge signal and localization method
CN110161383B (en) * 2019-04-30 2020-07-28 云南电网有限责任公司电力科学研究院 Switch cabinet partial discharge detection device
CN110456245A (en) * 2019-08-20 2019-11-15 武汉科瑞新电气自动化有限公司 A kind of switchgear PD Online monitoring system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102298107A (en) * 2011-05-20 2011-12-28 华南理工大学 Portable ultrasonic wave and cloud detection apparatus for partial discharge
CN102539897A (en) * 2012-02-28 2012-07-04 苏州苏海亚电气有限公司 High-voltage charged display with nuclear phase function
KR101307319B1 (en) * 2012-04-13 2013-09-10 엘에스산전 주식회사 System for detecting partial dischargeand signal and method thereof
CN102749561B (en) * 2012-07-10 2015-03-11 广州安电测控技术有限公司 Cloud service-based partial discharge transient-stage earth electric wave cloud detection method and device
CN103163432A (en) * 2012-09-18 2013-06-19 天津学子电力设备科技有限公司 Switch cabinet partial discharge detecting device based on ultrasonic measuring method
CN103913679B (en) * 2014-03-03 2017-08-08 高海涛 High-tension switch cabinet partial discharge monitoring system
CN203773010U (en) * 2014-03-04 2014-08-13 国联思创(北京)科技有限公司 Partial discharge on-line monitoring instrument based on switch cabinet charge indicator

Also Published As

Publication number Publication date
CN104502821A (en) 2015-04-08

Similar Documents

Publication Publication Date Title
CN102749562B (en) Insulation monitoring device and monitoring method of power cell of electric vehicle
WO2014154164A1 (en) Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network
CN102937675A (en) Real-time data collecting and fault positioning system of power distribution network and working method thereof
CN104897983B (en) A kind of grounding net of transformer substation impacts characteristics of the dispersed flow test device
CN101943719B (en) Shared-frequency asynchronous phase-checking method
CN102426328B (en) Capacitive equipment insulation state real-time on-line monitoring method
CN106771870A (en) A kind of distribution net work earthing fault localization method and system
CN201909667U (en) Running status voice and local electro-discharge online monitoring and analyzing device of transformer
CN101459334A (en) Electrical power system failure information obtaining method
CN201886066U (en) Transformer core grounding current monitor
CN104749498A (en) Portable partial discharge detecting and diagnosing device
CN105467241B (en) A kind of distribution converter transformer DC magnetic bias detecting system and its detection method
CN202854252U (en) Real-time data acquisition and fault locating system of power distribution network
CN103592554A (en) On-line monitoring system and method of 35kV high voltage shunt capacitor
CN103424674B (en) A kind of power cable terminal local discharge detection device and method for early warning
CN102298107A (en) Portable ultrasonic wave and cloud detection apparatus for partial discharge
CN207096378U (en) A kind of acoustoelectric combined partial discharge detecting system of switch cubicle
US20140216157A1 (en) Method for Determining Arc Discharge as well as Failure of Mechanical Vibration and Abnormal Displacement in Power Equipment Using Acoustic Energy Feature
CN201965191U (en) Capacitor intelligentizing device
CN202975247U (en) GIS PD partial-discharge on-line monitoring device
CN103913679B (en) High-tension switch cabinet partial discharge monitoring system
CN104777420B (en) The test system and its test method of a kind of high-voltage switch contact
CN203773010U (en) Partial discharge on-line monitoring instrument based on switch cabinet charge indicator
CN204044292U (en) For the system of gas insulated metal enclosed swit chgear insulation defect partial discharge monitoring
CN202066932U (en) Potable partial-discharge ultrasonic cloud detection device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant