CN102981106B - Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge - Google Patents
Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge Download PDFInfo
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- CN102981106B CN102981106B CN201210452043.4A CN201210452043A CN102981106B CN 102981106 B CN102981106 B CN 102981106B CN 201210452043 A CN201210452043 A CN 201210452043A CN 102981106 B CN102981106 B CN 102981106B
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Abstract
The invention relates to an online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge. The online inspection method of the three-phase cross interconnected electric cable intermediate head partial discharge comprises the following steps of (1) connecting three capacitive sensors with bolts, (2) connecting the three capacitive sensors with cable cores, (3) connecting the cable cores with detecting impedance, (4) connecting three pieces of detecting impedance and the outer skin of sensor electric cables and connecting the three pieces of detecting impedance and the outer skin of the sensor electric cables with the ground, (5) connecting the three pieces of detecting impedance with protective gaps in parallel, (6) connecting the detecting impedance with bayonet nut connectors (BNC), (7) connecting the BNC connectors with a oscilloscope, and (8) judging whether the electric cables have partial discharge through the oscilloscope. The online inspection method of the three-phase cross interconnected electric cables intermediate head partial discharge has the advantages of being used in detection when the electric cables run online, free from influences on power supply of a circuit, enabling the capacitive sensors and the detecting impedance to be installed in a interconnection box, only three measuring electric cables to be led out of the BNC connectors on the outer wall of the interconnection box in measurement and the measurement to be convenient, being safe and reliable, enabling a user to observe graphic information of detection signals directly through the oscilloscope and being capable of judging whether the electric cables have the partial discharge.
Description
Technical field
The present invention relates to the online test method of the cross interconnected cable intermediate head partial discharge of a kind of three-phase, refer more particularly to the method for the cross interconnected cable intermediate head partial discharge of a kind of capacitive transducer on-line checkingi three-phase.
Background technology
At present, both at home and abroad the shelf depreciation on-line checkingi of cable has been developed into the VHF(very high frequency(VHF) of today from traditional IEC60270 detection method) frequency band is even to UHF(superfrequency) detection of frequency band, particularly VHF(very high frequency(VHF)) detection well applied, but be all based on the detection of impulse current measurement coil near cable splice.For plow-in cable, due to cross interconnected case is only exposed on ground, far apart from cable splice, also there is no good detection method.
Capacitive transducer detection method is also never applied to some extent on the on-line checkingi of cable.
Summary of the invention
The object of this invention is to provide the online test method of the cross interconnected cable intermediate head partial discharge of a kind of three-phase, detect the shortcoming that can not detect plow-in cable shelf depreciation by cable local discharge at present to overcome.
The object of the invention is to be achieved through the following technical solutions:
An online test method for the cross interconnected cable intermediate head partial discharge of three-phase, comprises the following steps:
1) bolt of the high-pressure side of three capacitive transducers (1) by cable any side of interior three the cross connection busbars of case (2) cross interconnected with three-phase is respectively connected;
2) low pressure end of described three capacitive transducers (1) is connected with one end of three sensor cable (3) cores respectively;
3) other end of described three sensor cable (3) cores is detected respectively impedance (5) one end with three to be connected;
4) other end described three being detected impedance (5) is connected and ground connection with the crust of three sensor cables (3);
5) by portable protective gaps (4) in the two ends parallel connection of described three detections impedance (5);
6) one end that described three detections impedance (5) are connected with three sensor cables is connected with the BNC head (6) of three on cross interconnected tank wall;
7) described three BNC heads (6) are passed through in the outside of the cross interconnected case of three-phase (2) measure cable (7) expanding channels corresponding with oscillograph (8) respectively;
8) oscillograph (8) is connected with power supply, judges cable whether shelf depreciation by the graphical information of the upper display of oscillograph (8).
Described capacitive transducer is the capacitor of 80pF; alternating current-direct current withstand voltage is consistent with the withstand voltage of the cable alternating layers protector in the cross interconnected case of relevant voltage grade; without shelf depreciation under interchange 15kV; dielectric loss angle of loss measurement range under 1kHz frequency is 0 ~ 0.25%, and insulation resistance is measured as 100G Ω under direct current 100V.
Described sensor cable is preferably the concentric cable of 50 Ω.
Described detection impedance is preferably the detection resistance of 680 Ω.
Described gap protection threshold value is preferably 5V.
Described oscillograph is preferably the digital oscilloscope of triple channel high speed acquisition.
Beneficial effect of the present invention is: be detection during cable on-line operation, line powering is not affected, capacitance type transducers and detection impedance are fixedly mounted in interconnected case, BNC head only from interconnected box outer wall during measurement is drawn three measurement cables and is measured, make to measure conveniently, safe and reliable, the graphical information of detection signal can be seen by oscillograph intuitively, can judge whether cable has shelf depreciation according to criterion.
Accompanying drawing explanation
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is the connection layout that the online test method of the cross interconnected cable intermediate head partial discharge of three-phase described in the embodiment of the present invention uses equipment;
Fig. 2 is the process flow diagram of the online test method of the cross interconnected cable intermediate head partial discharge of three-phase described in the embodiment of the present invention;
Fig. 3 is the Partial Discharge figure of the A phase that the oscillograph described in the embodiment of the present invention shows;
Fig. 4 is the Partial Discharge figure of the B phase that the oscillograph described in the embodiment of the present invention shows;
Fig. 5 is the Partial Discharge figure of the C phase that the oscillograph described in the embodiment of the present invention shows;
Fig. 6 is the process flow diagram of the online test method of the cross interconnected cable intermediate head partial discharge of three-phase described in the embodiment of the present invention.
In figure:
1, capacitive transducer; 2, the cross interconnected case of three-phase; 3, sensor cable; 4, portable protective gaps; 5, impedance is detected; 6, BNC head; 7, cable is measured; 8, oscillograph; 9, far-end local discharge signal; 10, far-end corona signal; 11, lubricating cup; 12, high-field electrode; 13, the inner Partial discharge signal of GIS.
Embodiment
As shown in Figure 1; the online test method of the cross interconnected cable intermediate head partial discharge of a kind of three-phase described in the embodiment of the present invention; the bolt of cross connection busbar in the cross interconnected case 2 of three-phase is connected respectively with capacitive transducer 1; pulse signal is put through sensor cable 3 and detection impedance 5 in the office that capacitive transducer 1 is coupled to; portable protective gaps 4 in detection impedance 5 two ends parallel connection simultaneously; this signal caused interconnected case through BNC 6 outside; and connecting oscillograph 8 by measuring cable 7, oscillograph 8 shows the result detecting impedance 5 and detect.
When detecting shelf depreciation in the electric system of actual motion, have the interference reached from ground wire and space etc. cross interconnected line everywhere, the detection of shelf depreciation is impacted, even judge by accident, dominant interferer comprises: the undesired signal scurried into from ground wire and the large class of signal two scurried into from cable body far-end.Therefore, in the cross interconnected system of the three-phase in laboratory, inject the various interference of simulated field, utilize inner Partial discharge signal 13 and lubricating cup 11 inner high voltage electrode 12 produce with the cross interconnected system of three-phase GIS altogether atmospherical discharges signal to simulate the interference of radiation in interference on ground wire and air; The far-end local discharge signal 9 in the far-end corona signal 10 of the cross interconnected system terminal end of three-phase and terminal is utilized to simulate the interference transmitted from cable far-end, as shown in Figure 6, utilize capacitive transducer 1 to detect undesired signal at the same position place of the cross interconnected case 2 of three-phase, have found the characteristics of signals that undesired signal is different from the shelf depreciation in cross interconnected place cable splice.
A) from the far-end local discharge signal 9 that cable far-end produces, detect at three the signal polarity that impedance 5 detects identical, initial peak amplitude attenuation is severe, from the initial peak of very small magnitude, after several Sasser, reach mxm., Sasser is below decayed gradually, whole waveform diamondwise shape.
B) distally reach the far-end corona signal 10 of detection system, three detect signal polarity that impedances 3 detect just as, initial peak signal amplitude is larger.
C) when the disruptive discharge signal (discharging between lubricating cup 11 inner high voltage electrode 12) in air gap reaches detection system through air or earth mat, the signal polarity that impedance 5 detects is detected identical at three, initial peak amplitude attenuation is severe, from the initial peak of very small magnitude, mxm. is reached after several Sasser, Sasser is below decayed gradually, whole waveform diamondwise shape.
D) when reaching detection system from the inner Partial discharge signal 13 of GIS by earth mat, detect at three the signal polarity that impedance 5 detects identical, initial peak amplitude is larger.
In sum, if have a phase generation shelf depreciation in detected cable splice, the polarity that oscillograph 8 shows this phase cable signal oscillogram is contrary with the polarity of other two-phase cable signal waveforms, as in Figure 3-5, there is obvious distinguishing characteristics with other undesired signals, judge that this phase cable intermediate joint exists shelf depreciation by this criterion accordingly.
Described capacitive transducer is the capacitor of 80pF, alternating current-direct current withstand voltage should be consistent with the withstand voltage of the cable alternating layers protector in the cross interconnected case of relevant voltage grade, without shelf depreciation under interchange 15kV, dielectric loss angle of loss measurement range under 1kHz frequency is 0 ~ 0.25%, and insulation resistance is measured as 100G Ω under direct current 100V; Sensor cable is preferably the concentric cable of 50 Ω; Described detection impedance is preferably the detection resistance of 680 Ω; Described measurement cable 7 is concentric cable; Described oscillograph 8 is digital oscilloscope.
As shown in Figure 2, the online test method of the cross interconnected cable intermediate head partial discharge of a kind of three-phase described in the embodiment of the present invention, comprises the following steps:
1) bolt of the high-pressure side of three capacitive transducers 1 by cable any side of interior three the cross connection busbars of case 2 cross interconnected with three-phase is respectively connected;
2) low pressure end of described three capacitive transducers 1 is connected with one end of three sensor cable 3 cores respectively;
3) other end of described three sensor cable 3 cores is detected respectively impedance 5 one end with three to be connected;
4) other end described three being detected impedance 5 is connected and ground connection with the crust of three sensor cables 3;
5) by portable protective gaps 4 in the two ends parallel connection of described three detection impedances 5;
6) described three are detected one end of being connected with three sensor cables of impedances 5 and the BNC of three on cross interconnected tank wall 6 to be connected;
7) by described three BNC 6 in the outside of the cross interconnected case of three-phase 2 by measuring cable 7 expanding channels corresponding with oscillograph 8 respectively;
8) oscillograph 8 is connected with power supply, judges cable whether shelf depreciation by the graphical information of display on oscillograph 8.
During concrete use, whether the detection system comprising the capacitive transducer of access can the normal operation of influential system; When cable system is short-circuited fault, whether detection system can be affected, this is emulated the cross interconnected cable system having accessed detection system by EMTP_ATP electric analog software, simulates cable system when normally running, cable sheath earth fault, major insulation ground short circuit fault and sheath and major insulation respectively and the situation such as to break down simultaneously.Simulation result shows that detection system can not affect the normal operation of cable system, cable normally run and be short-circuited fault time, the voltage and current that detection system is born all can meet the requirement of detection system safe operation.
Detection system does not need power-off when detection is installed, by three capacitive transducers 1, three are detected impedance 5, portable protective gaps 4 in parallel is built in cross interconnected case 2, then draw wire respectively with three capacitive transducers 1 from the bolt of the intersection busbar in cross interconnected case 2 to be connected, again three capacitive transducers 1 are connect one respectively by three sensor cables 3 and detect impedance 5, the output terminal again three being detected impedances 5 is connected by coaxial shielding transmission line one end with three BNC on interconnected tank wall 6, whole detection system only draws one end of three BNC 6 in interconnected case, three are only needed to measure cable 7 during detection, the BNC that one termination extracts in interconnected case 6, the other end is connected on respectively on the different passage of three of oscillograph 8 and shows, when there is shelf depreciation in cable, the signal of detection is transferred to through sensor cable 3 and detects in impedance 5 by capacitive transducer 1, signal is transformed into voltage signal and is transferred on oscillograph 8 by detection impedance 5, the signal of each phase cable detected is demonstrated by the display structure on oscillograph, as in Figure 3-5, when polarity and other two phase voltages (A phases of the voltage of the B item cable detected, C phase) polarity contrary time, then B phase cable generation shelf depreciation.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection scope of the present invention.
Claims (1)
1. an online test method for the cross interconnected cable intermediate head partial discharge of three-phase, comprises the following steps:
1) bolt of the high-pressure side of three capacitive transducers (1) by cable any side of interior three the cross connection busbars of case (2) cross interconnected with three-phase is respectively connected;
2) low pressure end of described three capacitive transducers (1) is connected with one end of three sensor cable (3) cores respectively;
3) other end of described three sensor cable (3) cores is detected respectively impedance (5) one end with three to be connected;
4) other end described three being detected impedance (5) is connected and ground connection with the crust of three sensor cables (3);
5) by portable protective gaps (4) in the two ends parallel connection of described three detections impedance (5);
6) one end that described three detections impedance (5) are connected with three sensor cables is connected with the BNC head (6) of three on cross interconnected tank wall;
7) described three BNC heads (6) are passed through in the outside of the cross interconnected case of three-phase (2) measure cable (7) expanding channels corresponding with oscillograph (8) respectively;
8) oscillograph (8) is connected with power supply, judges cable whether shelf depreciation by the graphical information of the upper display of oscillograph (8);
It is characterized in that: the capacitor that described three capacitive transducers (1) are 80pF, alternating current-direct current withstand voltage is consistent with the withstand voltage of the cable alternating layers protector in the cross interconnected case of relevant voltage grade, without shelf depreciation under interchange 15kV, dielectric loss angle of loss measurement range under 1kHz frequency is 0 ~ 0.25%, and insulation resistance is measured as 100G Ω under direct current 100V; The threshold value of described portable protective gaps (4) is that 5V is to protect the safety detecting impedance and measuring oscilloscope; Described three sensor cables (3) are the cable of 50 Ω; Described three are detected the detection resistance that impedance (5) is 680 Ω; Described oscillograph (8) is triple channel high speed acquisition digital oscilloscope;
Described online test method
Power-off is not needed when detection is installed, by three capacitive transducers (1), three are detected impedance (5), portable protective gaps (4) in parallel is built in cross interconnected case (2), then draw wire respectively with three capacitive transducers (1) from the bolt of the intersection busbar in cross interconnected case (2) to be connected, again three capacitive transducers (1) are connect one respectively by three sensor cables (3) and detect impedance (5), the output terminal again three being detected impedance (5) is connected with one end of three BNC (6) heads on interconnected tank wall by coaxial shielding transmission line, one end of three BNC (6) is only drawn in interconnected case, three are only needed to measure cable (7) during detection, the BNC(6 that one termination extracts in interconnected case) head, the other end is connected on respectively on the different passage of three of oscillograph (8) and shows, when there is shelf depreciation in cable, the signal detected is transferred to three through three sensor cables (3) and detects in impedance (5) by three capacitive transducers (1), signal is transformed into voltage signal and is transferred on oscillograph (8) by three detections impedance (5), the signal of each phase cable detected is demonstrated by the display structure on oscillograph.
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| CN103308832B (en) * | 2013-05-31 | 2016-05-04 | 国家电网公司 | A kind of high-voltage cable insulating transition joint local discharge test device and using method |
| CN103344889B (en) * | 2013-07-02 | 2015-08-05 | 华北电力大学 | The method of cable local discharge measured by a kind of electric capacity wire jumper |
| CN104459492B (en) * | 2014-12-12 | 2018-01-05 | 国家电网公司 | Power cable pressure test local discharge detection device and detection method |
| CN104950231B (en) * | 2015-05-29 | 2018-01-23 | 广西电网有限责任公司电力科学研究院 | Cable insulation shelf depreciation defect and state of insulation resistance test method and device |
| CN106872860B (en) * | 2015-12-14 | 2020-07-21 | 中国电力科学研究院 | Cable line partial discharge signal identification and phase judgment method |
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| CN108680815A (en) * | 2018-03-28 | 2018-10-19 | 国网天津市电力公司 | Electrification capacity checking device for the cross interconnected system of high-tension cable grounding box |
| CN109782137A (en) * | 2018-12-06 | 2019-05-21 | 安徽凯川电力保护设备有限公司 | A kind of insulation line monitoring device and method |
| CN110308368A (en) * | 2019-07-05 | 2019-10-08 | 哈尔滨理工大学 | A kind of cable intermediate head partial discharge on-Line Monitor Device |
| CN112462199A (en) * | 2020-11-26 | 2021-03-09 | 国网上海市电力公司 | Partial discharge detection device and method based on cross-connection box |
| CN113917372B (en) * | 2021-10-18 | 2023-09-15 | 国网江苏省电力有限公司无锡供电分公司 | Method and device for checking cross interconnection system without unpacking |
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