CN201955439U - Online partial discharge detection system - Google Patents

Online partial discharge detection system Download PDF

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Publication number
CN201955439U
CN201955439U CN 201120046681 CN201120046681U CN201955439U CN 201955439 U CN201955439 U CN 201955439U CN 201120046681 CN201120046681 CN 201120046681 CN 201120046681 U CN201120046681 U CN 201120046681U CN 201955439 U CN201955439 U CN 201955439U
Authority
CN
China
Prior art keywords
cable
partial discharge
data acquisition
acquisition unit
measurement system
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
CN 201120046681
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Chinese (zh)
Inventor
刘锦英
张新敬
董啸
颜彦
徐斌
李靖强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
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 Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority to CN 201120046681 priority Critical patent/CN201955439U/en
Application granted granted Critical
Publication of CN201955439U publication Critical patent/CN201955439U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an online partial discharge detection system, which comprises a current transformer for detecting a medium/high-voltage cable. The output end of the current transformer are respectively connected with the input ends of an amplification module and a phase detection module, the output ends of the amplification module and the phase detection module are respectively connected with the input end of a data acquisition unit, and the output end of the data acquisition unit is connected with a computer terminal. By adopting the system, different defects of the cable can be detected, various types of interference from outside cable connectors can be effectively eliminated or suppressed, and partial discharge signals in the connectors can be actually measured. Characteristics of partial discharge can be accumulated into a 'knowledge base' based on research and analysis of characteristics and laws of the partial discharge under conditions with different cable defects, so as to provide valid reference for assessment of insulation of the cable connectors.

Description

PD On-Line Measurement System
Technical field
The utility model relates to a kind of PD On-Line Measurement System.
Background technology
Along with the development of urban and rural power grids, the use of power cable increases day by day, requires also progressively to improve.The method of preventive trial of insulating after the former reliable regular power failure can not reflect the state of insulation of cable under service condition really.Method that adopted or more promising employing has local discharge on-line detection methods such as dc superposition method, direct current composition method, cable insulation dielectric loss method both at home and abroad at present.In the local discharge on-line detection method, the survey frequency of traditional electromagnetic coupled method is generally tens KHZ to hundreds of KHZ, is difficult to satisfy cable office and puts Testing requirement.
The utility model content
For remedying the deficiencies in the prior art, the utility model is on original electromagnetic coupled method basis, and utilization digital collection technology and the data processing discharge signal of playing a game is monitored and handled.
For achieving the above object, the utility model adopts following technical scheme: PD On-Line Measurement System, and it comprises the current sensor that medium and high voltage cable is detected; The output terminal of described current sensor is connected with the input end of amplification module and phase detecting module respectively, and the output terminal of amplification module and phase detecting module is connected with the data acquisition unit input end respectively, and the data acquisition unit output terminal is connected with terminal.
Described current sensor is a Rogowsky coil type sensor.
Described amplification module is a signal preamplifier.
Described phase detecting module comprises low-pass active filter, and low-pass active filter is connected with the power frequency zero-crossing comparator.
Described data acquisition unit adopts the PCI5112 data collecting card.
Utilize the principle of current sensor senses cable local discharge to be: Rogowsky coil is installed on the ground wire of cable termination screen layer, the office of crossing cable shield by induced flow puts the pulse current office of detection and puts.Because it is small and exquisite flexibly that wide band magnetic coupling method has operating equipment, handling safety, anti-interference is stronger, can reflect advantages such as pulse waveform more truly.
Beneficial effect: but the various interference from the cable splice outside can effectively be rejected or suppress to the different defect situation of the utility model detection streamer, records the inner local discharge signal of joint really.By researching and analysing the feature and the rule thereof of shelf depreciation under the different defect situation of cable, the feature of shelf depreciation is accumulated as one " knowledge base ", for the insulation status of assessment cable splice provides effective reference.System realizes accurate location to the cable local discharge source according to mistiming of detectable signal, waveform character etc.; Detection system can in time be grasped the cable operation conditions, accurately locatees the Partial Discharge Sources of cable inside, and bearing accuracy can be lower than 1%, has saved manpower greatly, has reduced the probability that accident takes place, to being significant of prevention major accident.
Description of drawings
Fig. 1 the utility model fundamental block diagram.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
The cable local discharge on-line detecting system mainly is divided into following components: current sensor, signal preamplifier, phase detecting module, data acquisition unit and terminal, the fundamental block diagram of system as shown in Figure 1, it comprises the current sensor that medium and high voltage cable is detected; The output terminal of described current sensor is connected with the input end of amplification module and phase detecting module respectively, and the output terminal of amplification module and phase detecting module is connected with the data acquisition unit input end respectively, and the data acquisition unit output terminal is connected with terminal.Described current sensor is a Rogowsky coil type sensor.
Described amplification module is a signal preamplifier.
Described phase detecting module comprises low-pass active filter, and low-pass active filter is connected with the power frequency zero-crossing comparator.
Described data acquisition unit adopts the PCI5112 data collecting card.
Wherein, the magnetic-coupled method of current sensor electricity consumption is come the electric current in the detection streamer.
Signal preamplifier is mainly used in the high-frequency band pass filtering of current signal and amplifies, and makes sampled signal can reach the desired level range of metering circuit, and guarantees that tangible distortion and delay phenomenon do not appear in signal; Because the power cables capacitance amount is bigger, be not less than 50pC and can survey the partial discharge quantity requirement to system, so its discharge amplitude very little (in μ V level), requirement can be carried out anti-interference to shelf depreciation again simultaneously, this has proposed very high requirement with regard to pair amplifier, the measurement frequency band that should have broad has higher enlargement factor and very low own ship's noise again.According to the requirement to cable and annex Partial Discharge Detection thereof, we adopt amplifier band to be wider than 200k~20MHz, and enlargement factor can reach 1000 times.It mainly comprises decay and amplifies two parts.Selecting attenuation units for use mainly is to consider different discharge levels, needs different enlargement factors.In addition, the power unit of amplifier and extraneous power supply are isolated, and through Filtering Processing, with the disturbing effect amplifier performance that prevents that extraneous power supply from bringing.
The signal phase detection module is mainly used in the phase place of sensed current signal, wherein low-pass active filter can carry out the power frequency component that low-pass filtering obtains being fit to sampled signal, the power frequency zero-crossing comparator then with this power frequency component analysis is relatively judged the phase relation of discharge signal; For local discharge signal, except discharge amplitude size, the phase place of the moment that discharge takes place with respect to power-frequency voltage also is a very important parameter, and this helps the identification to electric discharge type.We adopt following method to obtain the phase place of discharge signal: introduce a power frequency supply from the outside, because the power-frequency voltage constant phase difference in the cable of this supply voltage and on-line operation, so can detect the phase place that obtains the discharge signal that sensors coupled goes out by phase place to this power frequency supply.
The signal of data acquisition unit after with analyzing and processing carries out complete collection, is uploaded in the host computer, carried out the final processing of local discharge signal by backstage analytic centre.Data acquisition unit partly and between the numerical portion plays a part bridge in the simulation of the online detector for partial discharge of cable splice, because the uniqueness of measurement of partial discharge, not only require data acquisition to meet nyquist sampling theorem (Nyquist Theorem), and will satisfy the requirement of measurement of partial discharge.According to nyquist sampling law (Nyquist Theorem), the sampling rate of acquisition system minimum must be the twice of measurand maximum frequency, just is unlikely to the frequency of occurrences and mixes repeatedly.And sampling rate is high more, and digital display circuit is recovered out to such an extent that waveform is true more, and is quantitatively accurate more.The Partial Discharge Detection of cable splice not only will be finished the collection to single discharge waveform, also wants simultaneously to record the phase place of single discharge waveform in its place power frequency period accurately, for later spectrum analysis is prepared.Therefore the data acquisition unit of this pick-up unit not only will have higher sampling rate, and darker storage depth (can gather the data of a power frequency period at least) also will be arranged.Through market study, the PCI5112 data collecting card that can adopt American National instrument company to produce.

Claims (5)

1. PD On-Line Measurement System is characterized in that, it comprises the current sensor that medium and high voltage cable is detected; The output terminal of described current sensor is connected with the input end of amplification module and phase detecting module respectively, and the output terminal of amplification module and phase detecting module is connected with the data acquisition unit input end respectively, and the data acquisition unit output terminal is connected with terminal.
2. PD On-Line Measurement System as claimed in claim 1 is characterized in that, described current sensor is a Rogowsky coil type sensor.
3. PD On-Line Measurement System as claimed in claim 1 is characterized in that, described amplification module is a signal preamplifier.
4. PD On-Line Measurement System as claimed in claim 1 is characterized in that described phase detecting module comprises low-pass active filter, and low-pass active filter is connected with the power frequency zero-crossing comparator.
5. PD On-Line Measurement System as claimed in claim 1 is characterized in that, described data acquisition unit adopts the PCI5112 data collecting card.
CN 201120046681 2011-02-24 2011-02-24 Online partial discharge detection system Expired - Fee Related CN201955439U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201120046681 CN201955439U (en) 2011-02-24 2011-02-24 Online partial discharge detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201120046681 CN201955439U (en) 2011-02-24 2011-02-24 Online partial discharge detection system

Publications (1)

Publication Number Publication Date
CN201955439U true CN201955439U (en) 2011-08-31

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Application Number Title Priority Date Filing Date
CN 201120046681 Expired - Fee Related CN201955439U (en) 2011-02-24 2011-02-24 Online partial discharge detection system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849626A (en) * 2015-04-10 2015-08-19 北京兴迪仪器有限责任公司 Power-frequency signal acquiring device for high-voltage power equipment
CN108107270A (en) * 2017-12-04 2018-06-01 囯网河北省电力有限公司电力科学研究院 A kind of synchronous sensor for identifying transformer induction field ionization source phase
CN109342814A (en) * 2018-09-05 2019-02-15 苏州光格设备有限公司 For determining the method, apparatus and storage medium of cable partial discharge operating frequency phase frequency

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849626A (en) * 2015-04-10 2015-08-19 北京兴迪仪器有限责任公司 Power-frequency signal acquiring device for high-voltage power equipment
CN108107270A (en) * 2017-12-04 2018-06-01 囯网河北省电力有限公司电力科学研究院 A kind of synchronous sensor for identifying transformer induction field ionization source phase
CN109342814A (en) * 2018-09-05 2019-02-15 苏州光格设备有限公司 For determining the method, apparatus and storage medium of cable partial discharge operating frequency phase frequency

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: STATE GRID CORPORATION OF CHINA

Effective date: 20121122

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20121122

Address after: 272129 torch No. 28, Shizhong District, Shandong City, Jining Province

Patentee after: Jining Power Supply Company of Shandong Electric Power Group Company

Patentee after: State Grid Corporation of China

Address before: 272129 torch No. 28, Shizhong District, Shandong City, Jining Province

Patentee before: Jining Power Supply Company of Shandong Electric Power Group Company

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110831

Termination date: 20160224