CN201373905Y - Safety detecting evaluation system of power cable - Google Patents
Safety detecting evaluation system of power cable Download PDFInfo
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- CN201373905Y CN201373905Y CN200920137012U CN200920137012U CN201373905Y CN 201373905 Y CN201373905 Y CN 201373905Y CN 200920137012 U CN200920137012 U CN 200920137012U CN 200920137012 U CN200920137012 U CN 200920137012U CN 201373905 Y CN201373905 Y CN 201373905Y
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Abstract
The utility model relates to a cable safety detecting evaluation system, which mainly consists of an alternating current pressure-resistant testing system and a partial discharging measurement system. The alternating current pressure-resistant testing system comprises a variable-frequency power source, an exciting transformer, a resonance reactor and a capacitive divider. The partial discharging measurement system comprises detecting impedance, a standard calibrator, an impulsator, a signal conditioning circuit, an oscilloscope and a computer. The cable safety detecting evaluation system can perform pressure-resistant tests through applying alternating current testing voltage to power cables with 110kV and voltage levels under 110kV, and detects and evaluates insulating conditions by being combined with the testing technique, the partial discharging detecting technique and the positioning technique.
Description
Technical field
The utility model relates to a kind of off-line system that can carry out safety detection and assessment to 110kV and following electric pressure power cable insulation situation, be mainly used in power cable to 110kV and following electric pressure and apply ac test voltage and carry out withstand voltage test, its shelf depreciation situation is detected and assesses.
Background technology
The common detection method of power cable insulation situation comprises: megger test, dielectric loss measurement, DC voltage withstand test, Ultra-low frequency voltage endurance test, power frequency or the withstand voltage test of class industrial frequency AC.All there is certain shortcoming in said method: although megger test and dielectric loss measurement are simple, can't effectively detect the fault of locality, slight type, can't provide early warning to insulation fault; DC voltage withstand test not only can't effectively detect the Insulation Problems that XLPE exists, and may cause serious Fault of Insulating Breakdown; Though Ultra-low frequency voltage endurance test belongs to AC voltage withstand test, and can reduce the testing equipment capacity greatly, the trial voltage of output is generally less than 40kV, can not satisfy the on-the-spot withstand voltage test requirement of domestic increasing 110kV twisted polyethylene cable.Power frequency or the withstand voltage test of class industrial frequency AC be the actual motion condition of dummycable correctly, the validity of test findings is better, but too high trial voltage not only has damage to insulation, and can't locate the weak link of insulation, often cause shortcomings such as maintenance workload is excessive, the part cable excessively overhauls, renewal cost height.
At present in conjunction with experimental technique, the power cable of Partial Discharge Detecting Technology and location technology detects apparatus for evaluating and exists following shortcoming: based on such device of ultralow frequency experimental technique, the electric pressure that is suitable for is lower, can not satisfy the needs of domestic electric power industry development; Based on such device of damped oscillation wave technology, because stable trial voltage can't be provided, partial discharge phenomenon can not stably reproduce, and test findings does not have versatility.
The utility model content
The purpose of this utility model be to provide a kind of can be in conjunction with exchanging the measurement result of resonance pressure-resistant test with shelf depreciation, the off-line system of the power cable insulation situation of 110kV and following electric pressure being carried out safety detection and assessment.
A kind of power cable safety detection evaluating system mainly is made up of AC voltage withstand test system and measurement of partial discharge system, and this AC voltage withstand test system comprises variable-frequency power sources, exciting transformer, resonance reactor and condenser divider; This measurement of partial discharge system comprises detection impedance, standard calibration device, pulse producer, signal conditioning circuit, oscillograph and computing machine;
Described variable-frequency power sources makes the distributed capacitance of resonance reactor and tested power cable produce resonance by frequency adjustment, obtains the test high voltage on tested power cable;
Described exciting transformer is used for the rated output voltage of variable-frequency power sources is carried out pre-loading, under the condition of resonance, on tested power cable, can obtain the trial voltage of input voltage several times, make the weak link generation shelf depreciation of tested power cable or its joint;
Described condenser divider be used to be coupled high-frequency current that shelf depreciation produces and detecting the voltage signal that produces certain amplitude in the impedance;
It is interior trial voltage and high frequency partial discharge signal of 30～300Hz that described detection impedance can effectively detect frequency simultaneously, and can make the approximate undamped of close and high frequency partial discharge signal of gaining that decay under the different tests frequency of trial voltage in 30～300Hz scope, help follow-up signal Processing and analysis;
Described standard calibration device is used for to tested power cable injected pulse, adjusts the enlargement factor of measuring equipment according to the master scale of professional software measurement result on the computing machine and standard calibration device, to obtain uniform measurement result;
Described pulse producer is mainly used in the length of measuring tested power cable, and the professional software on the coupled computer is used for the location of shelf depreciation;
The output signal that described signal conditioning circuit is used for detecting impedance is divided into low frequency trial voltage signal and high frequency partial discharge signal two-way is handled, and low frequency trial voltage signal is carried out filtering, and the high frequency partial discharge signal is carried out filtering, isolates and amplifies.
Described oscillograph is used for showing in real time low frequency trial voltage signal and high frequency partial discharge signal and signal is transferred to computing machine with digital form;
Described computing machine can be handled digitized local discharge signal sequential analysis, obtains the amplitude of signal after the data of collection are handled through digital noise reduction, with two dimension, the three-dimensional collection of illustrative plates of graphic form demonstration discharge signal, the two-dimensional space information of discharge position; Introduce the trial voltage signal simultaneously, be used to monitor the intermediate data of withstand voltage test, the initial sum extinction voltage of cable discharge, the phase measurement of local discharge signal.
The utlity model has following advantage:
One, can satisfy the requirement of existing each big grid company power cable handing-over and preventive trial rules.
Two, can the insulation status of 110kV power cable be detected and assess.
Three, trial voltage is stable, can stably reproduce partial discharge phenomenon, and testing result has versatility.
Four, set Partial Discharge Detection and location technology are carried out statistical study with the collection of illustrative plates mode to shelf depreciation, with the weak link of graphics mode indication cable insulation, for the programmed replacement of cable provides foundation, reduce labour intensity, reduce recondition expense, improve overhaul efficiency.
Description of drawings
Fig. 1 is a principle of work block scheme of the present utility model.
The utility model is described in further detail below in conjunction with specific embodiment.
Embodiment
A kind of power cable safety detection of the utility model evaluating system mainly is made up of AC voltage withstand test system 1 and measurement of partial discharge system 2.
This AC voltage withstand test system 1 comprises variable-frequency power sources 11, exciting transformer 12, resonance reactor 13 and condenser divider 14;
This measurement of partial discharge system 2 comprises detection impedance 21, standard calibration device 22, pulse producer 23, signal conditioning circuit 24, oscillograph 25 and computing machine 26;
Described variable-frequency power sources 11 makes the resonance reactor 13 and the distributed capacitance of tested cable 3 produce resonance by frequency adjustment, obtains the trial voltage of Pass Test requirement, makes tested cable 3 or its joint generation shelf depreciation; The high-frequency current that this shelf depreciation produces detects the voltage signal that produces certain amplitude in the impedance 21 through being coupling in of condenser divider 15;
Described exciting transformer 12 is used for the rated output voltage of variable-frequency power sources is carried out pre-loading, under the condition of resonance, on tested power cable 3, can obtain input voltage several times trial voltage, make the weak link generation shelf depreciation of tested power cable 3 and joint thereof;
Described condenser divider 14 be used to be coupled high-frequency current that shelf depreciation produces and detecting the voltage signal that produces certain amplitude in the impedance 21;
It is trial voltage and high frequency partial discharge signal under 30～300Hz that described detection impedance 21 can effectively detect simultaneously the trial voltage frequency, and can make the approximate undamped of close and high frequency partial discharge signal that under the different tests frequency, decay of trial voltage in 30～300Hz scope, help follow-up signal Processing and analysis;
Described standard calibration device 22 is to tested power cable 3 injected pulses, adjusts the enlargement factor of measuring equipment according to the master scale of professional software measurement result on the computing machine 26 and standard calibration device 22, to obtain uniform measurement result;
Described pulse producer 23 is to tested power cable 3 injected pulses, and according to the length that the time of return and the velocity of propagation of pulse are calculated tested cable, the professional software on the coupled computer 26 is used for the location of shelf depreciation;
The output signal that described signal conditioning circuit 24 is used for detecting impedance is divided into low frequency trial voltage signal and high frequency partial discharge signal two-way is handled, and low frequency trial voltage signal is carried out filtering, and the high frequency partial discharge signal is carried out filtering, isolates and amplifies.
Described oscillograph 25 is used for showing in real time low frequency trial voltage signal and high frequency partial discharge signal and signal is transferred to computing machine 26 with digital form;
Described computing machine 26 can be handled digitized local discharge signal sequential analysis, obtains the amplitude of signal after the data of collection are handled through digital noise reduction, shows two dimension, the three-dimensional collection of illustrative plates of discharge signal with graphic form;
When the part discharge takes place, office puts pulse and propagates to the power cable both sides from point of discharge, direct have mistiming to the direct pulse that measuring junction is propagated and the reflected impulse arrival detection impedance 21 that is reflected in the other direction after propagating, computing machine 26 can be analyzed definite discharge position to direct pulse, reflected impulse and the two mistiming, and shows the two-dimensional space information of discharge position with graphic form;
Computing machine 26 is introduced the detection and the analysis of trial voltage signal simultaneously, is used to monitor the intermediate data of withstand voltage test, the initial sum extinction voltage of cable discharge, the phase measurement of local discharge signal;
The local discharge signal of 26 pairs of collections of computing machine is saved in database and manages and support data report generation and printing.
Claims (1)
1, a kind of power cable safety detection evaluating system is characterized in that: mainly be made up of AC voltage withstand test system and measurement of partial discharge system, this AC voltage withstand test system comprises variable-frequency power sources, exciting transformer, resonance reactor and condenser divider; This measurement of partial discharge system comprises detection impedance, standard calibration device, pulse producer, signal conditioning circuit, oscillograph and computing machine;
Described variable-frequency power sources makes the distributed capacitance of resonance reactor and tested power cable produce resonance by frequency adjustment, obtains trial voltage on tested power cable;
Described exciting transformer is used for the rated output voltage of variable-frequency power sources is carried out pre-loading, under the condition of resonance, can obtain input voltage several times trial voltage on tested power cable, makes the weak link generation shelf depreciation of tested power cable or its joint;
The high-frequency current that described condenser divider coupling shelf depreciation produces is also detecting the voltage signal that produces certain amplitude in the impedance;
It is trial voltage and high frequency partial discharge signal under 30～300Hz that described detection impedance can effectively detect simultaneously the trial voltage frequency, and can make the approximate undamped of close and high frequency partial discharge signal that under the different tests frequency, decay of trial voltage in 30～300Hz scope, help follow-up signal Processing and analysis;
Described standard calibration device is used for to tested power cable injected pulse, adjusts the enlargement factor of measuring equipment according to the master scale of professional software measurement result on the computing machine and standard calibration device, to obtain uniform measurement result;
Described pulse producer is mainly used in the length of measuring tested power cable, and the professional software on the coupled computer is used for the location of shelf depreciation;
The output signal that described signal conditioning circuit is used for detecting impedance is divided into low frequency trial voltage signal and high frequency partial discharge signal two-way is handled, and low frequency trial voltage signal is carried out filtering, and the high frequency partial discharge signal is carried out filtering, isolates and amplifies;
Described oscillograph is used for showing in real time low frequency trial voltage signal and high frequency partial discharge signal and signal is transferred to computing machine with digital form;
Described computing machine can be handled digitized local discharge signal sequential analysis, obtains the amplitude of signal after the data of collection are handled through digital noise reduction, with two dimension, the three-dimensional collection of illustrative plates of graphic form demonstration discharge signal, the two-dimensional space information of discharge position; Introduce the trial voltage signal simultaneously, be used to monitor the intermediate data of withstand voltage test, the initial sum extinction voltage of cable discharge, the phase measurement of local discharge signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920137012U CN201373905Y (en) | 2009-03-04 | 2009-03-04 | Safety detecting evaluation system of power cable |
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| CN200920137012U CN201373905Y (en) | 2009-03-04 | 2009-03-04 | Safety detecting evaluation system of power cable |
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| CN102156788A (en) * | 2011-04-25 | 2011-08-17 | 武汉大学 | Method for simulating transmission property of partial discharge signal in power cable |
| CN102368089A (en) * | 2011-11-17 | 2012-03-07 | 江苏省电力公司南京供电公司 | Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test |
| CN102412739A (en) * | 2011-12-08 | 2012-04-11 | 大连理工大学 | Ultra low frequency high-voltage power supply |
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| CN103499778A (en) * | 2013-09-26 | 2014-01-08 | 国家电网公司 | Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV |
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| CN103592586A (en) * | 2013-11-27 | 2014-02-19 | 国家电网公司 | Power cable insulation monitoring system |
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| CN108051716A (en) * | 2018-02-01 | 2018-05-18 | 清华大学 | A kind of detection method for local discharge based on frequency dividing sampling |
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