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1. 发明专利

JP2001153912A METHOD FOR REMOVING EXTERNAL NOISE IN PARTIAL DISCHARGE SIGNAL OF POWER LINE 失效
公开(公告)号：JP2001153912A
公开(公告)日：2001-06-08
申请号：JP33797099
申请日：1999-11-29
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： GOTO TAKESHI , HORI YOSHIKATSU , TASHIRO TSUTOMU , IMAI TOMOAKI , ENDO TAKESHI
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To provide a method of removing external noise in the partial discharge signal of a power line which can take in and remove the external noise which does not exert a bad influence on the operation of a noise gate circuit, even if a partial discharge occurs from a joint. SOLUTION: To a joint 12 such as an insulated joint, an end joint, etc., of the power line 11, a signal detecting electrode 13a for detecting partial discharge of the power line and outputting a partial discharge signal is fitted. Besides, to the power line at a position being at a specified distance from the joint a noise detecting electrode 16 for detecting external noise is fitted. Namely, the specified distance for fitting the noise detecting electrode is set to a maximum distance which causes the gate circuit to be in a passing state, when the noise detecting electrode detects partial discharge generated at the joint. Consequently, the sensitivity for detection of a partial discharge signal can be improved.

2. 发明专利

JPH09236631A NOISE REMOVAL METHOD IN PARTIAL DISCHARGE MEASUREMENT 失效
公开(公告)号：JPH09236631A
公开(公告)日：1997-09-09
申请号：JP6730596
申请日：1996-02-28
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： NAKATOGAWA YUTAKA , SHIMODATE MASATO , ENDO TAKESHI , TASHIRO TSUTOMU
IPC分类号： G01R31/12 , G01R29/00
摘要： PROBLEM TO BE SOLVED: To perform partial discharge measurement with precision by effectively removing external noise relating to a high voltage power cable line. SOLUTION: A metal fail electrode 4 is installed to an insulation connection part 3 of a high voltage power cable line 1, for detecting partial discharge signal. The detected signal is sent to a partial discharge measuring device 5 for measurement. On both left and right sides approximate to a detection position of partial discharge, a high frequency iron core 6 attached to the power cable line 1 is assigned. At measurement, the partial discharge signal is propagated between an inner conductor and an outer sheath as reciprocating current, so that it is detected without affected by the high frequency iron core 6, but external noise is propagated while reciprocating between the power cable and ground, so that impedance rises at the place an which the high frequency iron care 6 is assigned, so that inflow of the noise to the partial discharge detecting part is suppressed.

3. 发明专利

JPH09211062A PARTIAL DISCHARGE MEASUREMENT METHOD 失效
公开(公告)号：JPH09211062A
公开(公告)日：1997-08-15
申请号：JP1304596
申请日：1996-01-29
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： NAKATOGAWA YUTAKA , SHIMODATE MASATO , ENDO TAKESHI , TASHIRO TSUTOMU , SUZUKI HIROSHI
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To detect partial discharge from a connection part with high sensitivity by removing a metal shielding layer in a specified width at both ends of a main edge cutting part for forming multiple detecting electrodes, and detecting partial discharge pulse from between these electrodes. SOLUTION: In a measuring system, a detection impedance is connected between metal foil electrodes 110a and 110b, and a partial discharge measuring part is connected to the detection impedance. And, another detection impedance is also connected to lead wires 111a and 111b connected to detecting electrodes 104a and 104b, and to the detection impedance, another partial discharge measuring part is connected. Thereby, a metal shielding layer 104 in a conductor connection part 102 is removed in circumferential direction for forming the two cylindrical detecting electrodes 104a and 104b, and partial discharge pulse is detected from between the two detecting electrodes, so that partial discharge from a reinforcing/insulating part where defect is apt to be caused is detected with high sensitivity.

4. 发明专利

JPH08285918A PARTIAL-DISCHARGE MEASURING METHOD 失效
公开(公告)号：JPH08285918A
公开(公告)日：1996-11-01
申请号：JP8545195
申请日：1995-04-11
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TOTANI ATSUSHI , GOTO TAKESHI , ENDO TAKESHI
IPC分类号： G01R31/12
摘要： PURPOSE: To obtain a partial-discharge measuring method which can select an optimum frequency which is hardly affected by a noise. CONSTITUTION: A signal detection impedance 4, a spectrum analyzer 5 and a noise gate circuit 6 which is used to exclude an external noise are connected in series with an insulating connection part 2, and a processing part 11 is connected to the noise gate circuit 6. Then, a frequency spectrum is found by the spectrum analyzer 5 at a time when calibration pulses are injected into a cable line 1, to be tested, by a calibration pulse oscillator 12 and at a time when the calibration pulses are not injected. Two kinds of frequency spectrums are passed through the noise gate circuit 6, and the S/N is computed by the processing part 11 on the basis of the two frequency spectrums.

5. 发明专利

JPH0843476A METHOD OF MEASURING PARTIAL DISCHARGE 失效
公开(公告)号：JPH0843476A
公开(公告)日：1996-02-16
申请号：JP18243894
申请日：1994-08-03
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TOTANI ATSUSHI , GOTO TAKESHI , SUZUKI HIROSHI , ENDO TAKESHI
IPC分类号： G01R31/12 , H02H5/00
摘要： PURPOSE:To measure a partial discharge with high sensitivity even when a detection place is away from the generated place of the partial discharge by a method wherein a frequency at which a computed value by a specific expression becomes maximum is found on the basis of a level at every frequency in a frequency spectrum. CONSTITUTION:A partial discharge which is generated in the common connection part 2 of a power cable line 1 is measured in an insulating connection part 3 which is away at a distance L. That is to say, a pulse oscillator 5 is operated, and a calibration pulse is injected from the connection part 3. The injected calibration pulse is measured by a spectrum analyzer 7, and a first frequency spectrum is found. Then, the oscillator 5 is stopped, a noise is measured in a state that the calibration pulse is not injected, and a second frequency spectrum is found. Levels at respective frequencies of the first and second frequency spectrums are designated respectively as S (w), N (w), and an attenuation constant at the respective frequencies is designated as d(w). Then, an expression of S (w).[-L.alpha(w)]/N(w) is computed. A frequency at which a computed value becomes maximum is used as a partial-discharge measuring frequency.

6. 发明专利

JPH07333290A INTERVAL VOLTAGE APPLYING APPARATUS AND PARTIAL DISCHARGE MEASURING METHOD UTILIZING THE SAME 失效
公开(公告)号：JPH07333290A
公开(公告)日：1995-12-22
申请号：JP15415594
申请日：1994-06-13
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TSUCHIYA SHINICHI , YOKOYAMA KAZUNOBU , SUDO YOSHIJI , IKEDA TADAYOSHI , ENDO TAKESHI
IPC分类号： G01R31/12 , G01R31/14
摘要： PURPOSE:To reduce the cost of a power source by switching the AC voltage in a zero-cross phase, and generating the AC voltage of an arbitrary cycle. CONSTITUTION:The AC voltage from an AC power source 1 is applied to the primary winding 6 side of a transformer 5. In this case, the phase information of the AC voltage from the power source 1 is sent to a controller 12. At the time of the zero-phase of the AC voltage, a thyristor TR1 3 is turned ON by the control signal from the controller 12, and the output of the control signal is stopped after an arbitrary cycle is elapsed. Then, the output from the power source 1 is cut OFF in the next zero-cross phase. Thus, the AC voltage is generated at a secondary winding 7 side, i.e., in a power cable. Then, after an arbitrary interval, a thyristor TR2 4 is similarly turned ON, the AC voltage is generated to obtain an interval wave. The voltage generated across the detected impedance 10 connected to the insulator Cx 9 of the cable by utilizing it is detected by a partial discharge measuring unit 11, thereby measuring the partial discharge.

7. 发明专利

JPH04331381A CALIBRATING METHOD OF PARTIAL DISCHARGE MEASUREMENT 失效
公开(公告)号：JPH04331381A
公开(公告)日：1992-11-19
申请号：JP4136991
申请日：1991-01-10
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： KATSUTA GINZO , TOTANI ATSUSHI , ENDO TAKESHI , SUZUKI HIROSHI , IMAI TOMOAKI , HAGITANI MIKIO
IPC分类号： G01R31/12
摘要： PURPOSE:To perform correctly the calibration of the partial discharge measurement of a power cable in hot-line state by injecting a calibration pulse into a direct detection system, detecting the calibration pulse by a measurement system, and making not affected by the attenuation of the calibration pulse. CONSTITUTION:A partial discharge measurement equipment 25 is connected into the grounding cable 23 of a sheath 22 of a power cable 20. A calibration pulse oscillator 27 is conneted parallel to the measurement equipment 25, and the detecting sensitivity of the calibration pulse is found by the measurement system containing several impedances of a characteristic impedance 26 between a high voltage conductor 21 of the cable 20 and the sheath 22, a ground impedance 28 between the grounded sheath 22 and the ground, and a coupling impedance 27 between the high voltage conductor 21 and the ground. The calibration of a partial discharge measurement of the power cable 20 is very correctly performed without being affected by the attinuation of the pulse occurring when the calibration pulse is propagated through the power cable 20, by connecting the calibration pulse oscillator 27 parallel to a detection system, injecting the calibration pulse into the direct detection system, and detecting the calibration pulse by the measurement system.

8. 发明专利

JPS61243679A CABLE CONDUCTOR INDUCTION HEATING 失效
公开(公告)号：JPS61243679A
公开(公告)日：1986-10-29
申请号：JP8471885
申请日：1985-04-19
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： NAKAHASAMI TOSHIAKI , ENDO TAKESHI , SHIRAI HISAYA
IPC分类号： H01R43/00 , H02G1/14 , H05B6/10

9. 发明专利

JP2002062331A DIAGNOSTIC METHOD FOR DETERIORATION IN WATER TREE OF POWER CABLE 失效
公开(公告)号：JP2002062331A
公开(公告)日：2002-02-28
申请号：JP2000248798
申请日：2000-08-18
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： NAKADE MASAHIKO , INOUE DAISUKE , MURATA YOSHINAO , ENDO TAKESHI
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To provide a diagnostic method for deterioration in a water tree of a power cable, which enables diagnosing of deterioration in the water tree which is clearly distinguished from harmonic components, based on the noise- oriented harmonic components and the deterioration in the water tree which a power source or the like contains. SOLUTION: A first circuit 1, in which a sample capacitor (Cx) made up of an insulating body of a CV cable is connected in series with a variable resistance 3 (R3) via a midpoint a, is connected in parallel to a second circuit 4, in which a parallel connection circuit 8 of a variable capacitor 6 (C4) and a fixed resistance 7 (R4) is connected in series with a standard capacitor 5 (Cs) via a midpoint b to form a sharing bridge circuit 9 and an isolation differential amplifier 10, a band-pass filter 11, an amplifier 12 and an oscilloscope 13 are connected sequentially to the midpoints a and b, to form a measuring circuit. Generation of deterioration in the water tree is diagnosed, by confirming harmonic components which are contained in boss current, while the ratio of the respective fundamental wave components of voltages thereto is constant at the different values thereof.

10. 发明专利

JPH07225253A PARTIAL DISCHARGE MEASURING SYSTEM 失效
公开(公告)号：JPH07225253A
公开(公告)日：1995-08-22
申请号：JP3913394
申请日：1994-02-14
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TOTANI ATSUSHI , GOTO TAKESHI , ENDO TAKESHI , SUZUKI HIROSHI , EJIMA HIROTAKA
IPC分类号： G01R31/12
摘要： PURPOSE:To improve the detection of partial discharge and measuring accuracy and provide an inexpensive system therefor by discriminating a partial discharge signal and noise or removing only a noise component mixing in the partial discharge signal. CONSTITUTION:This system is equipped with a plurality of signal detecting parts 24 which are provided along a long cable line 70 in order to detect partial discharge signals of the line 70 and noises in the vicinity thereof, a plurality of transmitting stations 25 for sending the detection signals of the parts 24 as reception signal, a plurality of receiving stations 26 for receiving the transmitting signals sent from the stations 25 as reception signal, and a plurality of judging parts 27 which process the reception signals of the stations 26 based on at least one parameter out of simultaneously detected noise, phase of phase voltage corresponding to the long cable line, and the continuity and level of a signal that is considered to be a partial discharge suspected signal and generate the partial discharge suspected signal.

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