CN103499777A - Ultralow frequency partial discharge detection-based evaluation method and system - Google Patents
Ultralow frequency partial discharge detection-based evaluation method and system Download PDFInfo
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- CN103499777A CN103499777A CN201310447186.0A CN201310447186A CN103499777A CN 103499777 A CN103499777 A CN 103499777A CN 201310447186 A CN201310447186 A CN 201310447186A CN 103499777 A CN103499777 A CN 103499777A
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Abstract
The invention discloses an ultralow frequency partial discharge detection-based evaluation method and an ultralow frequency partial discharge detection-based evaluation system. The method comprises the following steps: determining a power cable on which insulation performance evaluation is required to be performed according to the new laying or operation condition of a cable line; disconnecting the section of cable line with electric equipment at the two ends and taking a safety measure; performing ultralow frequency partial discharge detection on the cable line through an ultralow frequency cable partial discharge diagnosis and positioning system; performing symmetrical analysis on a partial discharge detection result by comparing the laying conditions at a cable path and a middle joint position so as to make effective evaluation on the insulation performance of the cable line. The system comprises a testing power supply, a filter, a coupling capacitor, an impedance detector and a partial discharge detector. According to the method and the system, by performing ultralow frequency partial discharge actual measurement on the cable, the mounting quality of the cable is effectively discovered, and the insulation situation of the cable is learnt, the faults of the cable are reduced, the hidden faults of the cable line can be timely discovered, and the method and system have great significance to safe and reliable operation of a power grid.
Description
Technical field
The invention belongs to power cable maintenance technology field, relate in particular to a kind of appraisal procedure and system based on the ultralow frequency Partial Discharge Detection.
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 meeting of cable further aggravates, 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 that causes power cable insulation to destroy, and therefore to by effective appraisal procedure, the insulating property of power cable being assessed, finds in time potential faults, is the important means that ensures its reliability service.
Have now and 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 purpose of the embodiment of the present invention is to provide a kind of appraisal procedure and system based on the ultralow frequency Partial Discharge Detection, is intended to solve the existing problem that lacks 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 the ultralow frequency Partial Discharge Detection, should the appraisal procedure based on the ultralow frequency Partial Discharge Detection comprise the following steps:
Step 1, newly lay or ruuning situation according to cable line, suspection existed to the power cable of insulation defect, in conjunction with the test arrangement before putting into operation or with the interruption maintenance plan of the electrical equipment that links, arrange this section cable line to carry out the ultralow frequency Partial Discharge Detection;
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, measure the office of cable high-volume, and the cable partial discharge defective locations is carried out to pinpoint.
Another purpose of the embodiment of the present invention is to provide a kind of system based on the ultralow frequency Partial Discharge Detection, should the system based on the ultralow frequency Partial Discharge Detection comprise: 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;
With testing power supply, be connected, for the wave filter of elimination power supply and other coupled interference;
With wave filter, be connected, for the coupling capacitance of the local discharge signal of the test product that is coupled with detect impedance;
With coupling capacitance, with the detection impedance, be connected for detection of the size of local discharge signal and the Partial discharge detector of location.
Appraisal procedure and system based on the ultralow frequency Partial Discharge Detection provided by the invention, by cable being carried out to the actual measurement of ultralow frequency (VLF) shelf depreciation, effectively find the installation quality of cable and understand its insulation status, so that insulating performance of cable is assessed; 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, measure the office of cable high-volume, and the cable partial discharge defective locations is carried out to pinpoint.The present invention is put and is detected and defect location by office, finds in time the insulation defect existed in cable major insulation, intermediate head and terminal, and puts detection for the office of new cabling, has reduced the generation of cable fault.In addition, the present invention is for checking the installation quality of power cable and annex thereof, and assessment moves the health status of cable line, can find in time the potential faults of cable line, to guaranteeing the safe and reliable operation important in inhibiting of electrical network.
The accompanying drawing explanation
Fig. 1 is the process flow diagram of the appraisal procedure based on the ultralow frequency Partial Discharge Detection that provides of the embodiment of the present invention;
Fig. 2 is the structural representation of the system based on the ultralow frequency Partial Discharge Detection that provides of the embodiment of the present invention;
In figure: 1, testing power supply; 2, wave filter; 3, coupling capacitance and detection impedance; 4, Partial discharge detector.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is 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 the ultralow frequency Partial Discharge Detection of the embodiment of the present invention comprises the following steps:
S101: newly lay or ruuning situation according to cable line, suspection existed to the power cable of insulation defect, in conjunction with the test arrangement before putting into operation or with the interruption maintenance plan of the electrical equipment that links, arrange this section cable line to carry out the ultralow frequency Partial Discharge Detection;
S102: the electrical equipment at this section cable line and two ends is disconnected, and carry out safety practice, guarantee and the safe distance of contiguous electrical equipment, establish special messenger's monitoring simultaneously, prevent that the person from getting an electric shock;
S103: by the diagnosis of ultralow frequency cable partial discharge and the positioning system of 0.1Hz, cable line is carried out to the ultralow frequency Partial Discharge Detection;
S104: by cable line partial discharge quantity size and produce the location detection data 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, insulating property are made to Efficient Evaluation.
In step S103, 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 office of cable high-volume, and the cable partial discharge defective locations is carried out to pinpoint.
As shown in Figure 2, the system based on the ultralow frequency Partial Discharge Detection of the embodiment of the present invention is mainly by 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;
With testing power supply 1, be connected, for the wave filter 2 of elimination power supply and other coupled interference;
With wave filter 2, be connected, for the coupling capacitance of the local discharge signal of the test product that is coupled with detect impedance 3;
With coupling capacitance, with detection impedance 3, be connected for detection of the size of local discharge signal and the Partial discharge detector 4 of location.
The present invention can effectively find the installation quality of cable and understand its insulation status, so that insulating performance of cable is assessed.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the appraisal procedure based on the ultralow frequency Partial Discharge Detection, is characterized in that, should the appraisal procedure based on the ultralow frequency Partial Discharge Detection comprise the following steps:
Step 1, newly lay or ruuning situation according to cable line, suspection existed to the power cable of insulation defect, in conjunction with the test arrangement before putting into operation or with the interruption maintenance plan of the electrical equipment that links, arrange this section cable line to carry out the ultralow frequency Partial Discharge Detection;
Step 2, disconnect the electrical equipment at this section cable line and two ends, and carry out safety practice, guarantees and the safe distance of contiguous electrical equipment, establishes special messenger's monitoring simultaneously, prevents that 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, carry out the ultralow frequency Partial Discharge Detection to cable line;
Step 4, by to cable line partial discharge quantity size and produce the location detection data 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, insulating property are made to Efficient Evaluation.
2. the appraisal procedure based on the ultralow frequency Partial Discharge Detection as claimed in claim 1, it is characterized in that, 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 office of cable high-volume, the cable partial discharge defective locations is carried out to pinpoint.
3. the evaluating system based on the ultralow frequency Partial Discharge Detection, is characterized in that, should comprise by the evaluating system based on the 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;
With testing power supply, be connected, for the wave filter of elimination power supply and other coupled interference;
With wave filter, be connected, for the coupling capacitance of the local discharge signal of the test product that is coupled with detect impedance;
With coupling capacitance, with the detection impedance, be connected for detection of the size of local discharge signal and the Partial discharge detector of location.
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Cited By (6)
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CN104865500A (en) * | 2015-05-22 | 2015-08-26 | 华南理工大学 | High voltage cable outer sheath differentiation insulation defect evaluation method |
CN105589015A (en) * | 2014-10-21 | 2016-05-18 | 国家电网公司 | Cable oscillation wave partial discharge detection fault judgment standard building method |
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 |
CN111289837A (en) * | 2020-02-06 | 2020-06-16 | 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 |
CN112924823A (en) * | 2021-01-28 | 2021-06-08 | 国网山东省电力公司淄博供电公司 | Power cable partial discharge quantity measuring method and system |
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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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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105589015A (en) * | 2014-10-21 | 2016-05-18 | 国家电网公司 | Cable oscillation wave partial discharge detection fault judgment standard building method |
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 |
CN104865500A (en) * | 2015-05-22 | 2015-08-26 | 华南理工大学 | High voltage cable outer sheath differentiation insulation defect evaluation method |
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 |
CN111289837A (en) * | 2020-02-06 | 2020-06-16 | 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 |
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 |
CN112924823A (en) * | 2021-01-28 | 2021-06-08 | 国网山东省电力公司淄博供电公司 | Power cable partial discharge quantity measuring method and system |
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 |
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