CN103499777B - A kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system - Google Patents
A kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system Download PDFInfo
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- CN103499777B CN103499777B CN201310447186.0A CN201310447186A CN103499777B CN 103499777 B CN103499777 B CN 103499777B CN 201310447186 A CN201310447186 A CN 201310447186A CN 103499777 B CN103499777 B CN 103499777B
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Abstract
The invention discloses a kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system, the method is: newly lay or ruuning situation according to cable line, determines the power cable needing to carry out insulating property assessment; The electrical equipment at this section of cable line and two ends is disconnected, and carries out safety practice; Diagnosed and positioning system by ultralow frequency cable partial discharge, ultralow frequency Partial Discharge Detection is carried out to cable line; By comparison cable trace and intermediate head position laying state, systematic analysis is carried out to Partial Discharge Detection result, Efficient Evaluation is made to the insulating property of cable line; This system is: testing power supply, wave filter, coupling capacitance and detection impedance, Partial discharge detector.The present invention is by carrying out the actual measurement of ultralow frequency shelf depreciation to cable, effectively find the installation quality of cable and understand its insulation status, decrease the generation of cable fault, the potential faults of energy Timeliness coverage cable line, to the safe and reliable operation important in inhibiting ensureing electrical network.
Description
Technical field
The invention belongs to power cable maintenance technology field, particularly relate to a kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system.
Background technology
Because power cable is widely used in urban distribution network, the failure rate of cable directly has influence on the power supply reliability of electrical network, and As time goes on, the insulation ag(e)ing of cable can aggravate further, the electric network fault caused therefrom will be more frequent, and this is by the safe operation of serious threat electrical network.
Long-term practice proves, shelf depreciation is the main cause causing power cable insulation to destroy, and therefore assesses by the insulating property of effective appraisal procedure to power cable, Timeliness coverage potential faults, is the important means ensureing its reliability service.
Existingly lack the method that the insulating property of power cable are assessed, be unfavorable for the reliability service of electrical network.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system, is intended to solve the existing problem lacked the method that the insulating property of power cable are assessed.
The embodiment of the present invention is achieved in that a kind of appraisal procedure based on ultralow frequency Partial Discharge Detection, should comprise the following steps based on the appraisal procedure of ultralow frequency Partial Discharge Detection:
Step one, newly lays or ruuning situation according to cable line, there is the power cable of insulation defect to suspecting, in conjunction with the test arrangement before putting into operation or the interruption maintenance plan with the electrical equipment that is connected, arranges this section of cable line to carry out ultralow frequency Partial Discharge Detection;
Step 2, disconnects the electrical equipment at this section of cable line and two ends, and carries out safety practice, guarantees, with the safe distance of contiguous electrical equipment, to establish special messenger to guard simultaneously, prevents the person from getting an electric shock;
Step 3, by the diagnosis of ultralow frequency cable partial discharge and the positioning system of 0.1Hz, carries out ultralow frequency Partial Discharge Detection to cable line;
Step 4, by detecting data to cable line partial discharge quantity size and generating unit and the actual laying state of cable trace and intermediate head position is compared, simultaneously with reference to existing country, Technical specifications, to determine the general level of the health of cable line, Efficient Evaluation is made to insulating property.
Further, in step 3, the diagnosis of ultralow frequency cable partial discharge and positioning system utilize 0.1Hz pure sine wave testing power supply to excite shelf depreciation, and the office of measuring cable high-volume, carries out pinpoint to cable partial discharge defective locations.
Another object of the embodiment of the present invention is to provide a kind of system based on ultralow frequency Partial Discharge Detection, should comprise based on system of ultralow frequency Partial Discharge Detection: testing power supply, wave filter, coupling capacitance and detection impedance, Partial discharge detector;
For sending the testing power supply of 0.1Hz pure sine wave;
Be connected with testing power supply, for the wave filter of elimination power supply and other coupled interference;
Be connected with wave filter, for coupling capacitance and the detection impedance of the local discharge signal of the test product that is coupled;
With coupling capacitance with detect impedance and be connected Partial discharge detector for the size and location detecting local discharge signal.
Appraisal procedure based on ultralow frequency Partial Discharge Detection provided by the invention and system, by carrying out the actual measurement of ultralow frequency (VLF) shelf depreciation to cable, effectively find the installation quality of cable and understand its insulation status, to assess insulating performance of cable; The diagnosis of ultralow frequency (VLF) cable partial discharge and positioning system utilize 0.1Hz pure sine wave testing power supply to excite shelf depreciation, and the office of measuring cable high-volume, carries out pinpoint to cable partial discharge defective locations.The present invention puts detection and defect location by office, the insulation defect existed in Timeliness coverage cable major insulation, intermediate head and terminal, and puts detection for the office of new cabling, decreases the generation of cable fault.In addition, the present invention is for checking the installation quality of power cable and annex thereof, and assessment runs the health status of cable line, and the potential faults of energy Timeliness coverage cable line, to the safe and reliable operation important in inhibiting ensureing electrical network.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the appraisal procedure based on ultralow frequency Partial Discharge Detection that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the system based on ultralow frequency Partial Discharge Detection that the embodiment of the present invention provides;
In figure: 1, testing power supply; 2, wave filter; 3, coupling capacitance and detection impedance; 4, Partial discharge detector.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the appraisal procedure based on ultralow frequency Partial Discharge Detection of the embodiment of the present invention comprises the following steps:
, there is the power cable of insulation defect to suspecting in S101: newly lay or ruuning situation according to cable line, in conjunction with the test arrangement before putting into operation or the interruption maintenance plan with the electrical equipment that is connected, arranges this section of cable line to carry out ultralow frequency Partial Discharge Detection;
S102: disconnected by the electrical equipment at this section of cable line and two ends, and carry out safety practice, guarantees, with the safe distance of contiguous electrical equipment, to establish special messenger to guard simultaneously, prevents the person from getting an electric shock;
S103: by the diagnosis of ultralow frequency cable partial discharge and the positioning system of 0.1Hz, ultralow frequency Partial Discharge Detection is carried out to cable line;
S104: by detecting data to cable line partial discharge quantity size and generating unit and the actual laying state of cable trace and intermediate head position is compared, simultaneously with reference to existing country, Technical specifications, to determine the general level of the health of cable line, Efficient Evaluation is made to insulating property.
In step s 103, the diagnosis of ultralow frequency cable partial discharge and positioning system utilize 0.1Hz pure sine wave testing power supply to excite shelf depreciation, and the office of measuring cable high-volume, carries out pinpoint to cable partial discharge defective locations.
As shown in Figure 2, the system based on ultralow frequency Partial Discharge Detection of the embodiment of the present invention is primarily of: testing power supply 1, wave filter 2, coupling capacitance and detection impedance 3, Partial discharge detector 4;
For sending the testing power supply 1 of 0.1Hz pure sine wave;
Be connected with testing power supply 1, for the wave filter 2 of elimination power supply and other coupled interference;
Be connected with wave filter 2, for coupling capacitance and the detection impedance 3 of the local discharge signal of the test product that is coupled;
With coupling capacitance with detect the Partial discharge detector 4 that impedance 3 is connected size for detecting local discharge signal and location.
The present invention effectively can find the installation quality of cable and understand its insulation status, to assess insulating performance of cable.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. based on an appraisal procedure for ultralow frequency Partial Discharge Detection, it is characterized in that, should comprise the following steps based on the appraisal procedure of ultralow frequency Partial Discharge Detection:
Step one, newly lays or ruuning situation according to cable line, there is the power cable of insulation defect to suspecting, in conjunction with the test arrangement before putting into operation or the interruption maintenance plan with the electrical equipment that is connected, arranges this section of cable line to carry out ultralow frequency Partial Discharge Detection;
Step 2, disconnects the electrical equipment at this section of cable line and two ends, and carries out safety practice, guarantees, with the safe distance of contiguous electrical equipment, to establish special messenger to guard simultaneously, prevents the person from getting an electric shock;
Step 3, by the diagnosis of ultralow frequency cable partial discharge and the positioning system of 0.1Hz, carries out ultralow frequency Partial Discharge Detection to cable line;
Step 4, by detecting data to cable line partial discharge quantity size and generating unit and the actual laying state of cable trace and intermediate head position is compared, simultaneously with reference to existing country, Technical specifications, to determine the general level of the health of cable line, Efficient Evaluation is made to insulating property;
In step 3, the diagnosis of ultralow frequency cable partial discharge and positioning system utilize 0.1Hz pure sine wave testing power supply to excite shelf depreciation, measure the partial enlargement amount of cable, carry out pinpoint to cable partial discharge defective locations;
The evaluating system that should use based on the appraisal procedure of ultralow frequency Partial Discharge Detection comprises: testing power supply, wave filter, coupling capacitance and detection impedance, Partial discharge detector;
For sending the testing power supply of 0.1Hz pure sine wave;
Be connected with testing power supply, for the wave filter of elimination power supply and other coupled interference;
Be connected with wave filter, for coupling capacitance and the detection impedance of the local discharge signal of the test product that is coupled;
With coupling capacitance with detect impedance and be connected Partial discharge detector for the size and location detecting local discharge signal.
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| CN201310447186.0A CN103499777B (en) | 2013-09-26 | 2013-09-26 | A kind of appraisal procedure based on ultralow frequency Partial Discharge Detection and system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105589015B (en) * | 2014-10-21 | 2019-01-25 | 国家电网公司 | A kind of method for building up of cable oscillatory wave partial discharge detection failure criterion |
| CN104865500B (en) * | 2015-05-22 | 2018-06-22 | 华南理工大学 | A kind of evaluation method of high-tension cable outer jacket differentiation insulation defect |
| CN110927542A (en) * | 2019-12-17 | 2020-03-27 | 国网辽宁省电力有限公司电力科学研究院 | Cable joint partial discharge detection device |
| CN111289837B (en) * | 2020-02-06 | 2022-04-08 | 云南电网有限责任公司电力科学研究院 | Method and system for evaluating latent fault of power distribution network equipment |
| CN112578223A (en) * | 2020-12-07 | 2021-03-30 | 国网北京市电力公司 | Method and device for determining fault position, storage medium and electronic device |
| CN112924823B (en) * | 2021-01-28 | 2022-06-17 | 国网山东省电力公司淄博供电公司 | Power cable partial discharge quantity measuring method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749558A (en) * | 2012-06-20 | 2012-10-24 | 西安博源电气有限公司 | Device and method for detecting cable oscillatory wave partial discharge and fault location |
| CN102914733A (en) * | 2012-11-16 | 2013-02-06 | 中国电力科学研究院 | In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable |
| CN202770953U (en) * | 2012-07-24 | 2013-03-06 | 江苏省电力公司电力科学研究院 | Partial discharge detector for oscillating wave of crosslinked cable |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749558A (en) * | 2012-06-20 | 2012-10-24 | 西安博源电气有限公司 | Device and method for detecting cable oscillatory wave partial discharge and fault location |
| CN202770953U (en) * | 2012-07-24 | 2013-03-06 | 江苏省电力公司电力科学研究院 | Partial discharge detector for oscillating wave of crosslinked cable |
| CN102914733A (en) * | 2012-11-16 | 2013-02-06 | 中国电力科学研究院 | In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable |
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| Title |
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| 0.1Hz和50Hz电压下XLPE电缆局部放电比对试验;罗俊华等;《高电压技术》;20100831;第36卷(第8期);2000-2004 * |
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