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1. 发明专利

JPS53121137A RESONANCE SUPPRESSING DEVICE 失效
公开(公告)号：JPS53121137A
公开(公告)日：1978-10-23
申请号：JP3576377
申请日：1977-03-30
申请人： TOKYO ELECTRIC POWER CO , MITSUBISHI ELECTRIC CORP
发明人： KATOU KOUICHI , SUZUKI HIROSHI , FUJIWARA RIYOUICHI
IPC分类号： H02H1/00 , H02H3/50 , H02J3/00 , H02J3/24
摘要： PURPOSE:To suppress low frequency resonance by providing reactor which is connected in parallel with series capacitor and thrown in parallel with the whole or portion of series capacitor only when low frequency resonance occurred.

2. 发明专利

JPS60131033A TRANSMITTING APPARATUS 失效
公开(公告)号：JPS60131033A
公开(公告)日：1985-07-12
申请号：JP23761883
申请日：1983-12-16
申请人： TOKYO ELECTRIC POWER CO , MITSUBISHI ELECTRIC CORP
发明人： KAWAHIRA HIROYOSHI , YOROZUYA TSURUO , SHIZAKI YASUHIDE , YOKOUCHI KAZUHIRO , SUZUKI HIROSHI
IPC分类号： H02J3/06 , H02B1/24

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

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.

5. 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.

6. 发明专利

JP2000002741A METHOD FOR REMOVING EXTERNAL NOISE 失效
公开(公告)号：JP2000002741A
公开(公告)日：2000-01-07
申请号：JP16661298
申请日：1998-06-15
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TOTANI ATSUSHI , TANAKA KENICHIRO , SUZUKI HIROSHI , SATO HIDEO , ENDO TAKESHI , EJIMA HIROTAKA
IPC分类号： G01R31/12 , G01R31/00
摘要： PROBLEM TO BE SOLVED: To realize a method for easily removing background noise in real time by outputting a data with added digital data having a prescribed time as a partial discharge signal when the digital data in the detecting time of a target to be measured exceeds a judgment level. SOLUTION: In a pulse waveform III, the differences of the signal maximum value of a section (j) from the signal maximum values of the sections before and after it are larger than a threshold Sa as shown by F in the drawing. The weighted average value of cycle (k-1) is smaller than a threshold Sa as shown by E in the drawing. Accordingly, a judgment level 13 corresponds to a value shown by the dotted line. Since a data exceeding the judgment level 13 is present in the position of G in the section (j), a sampling data including the digital data of G and having a prescribed time width before and after it (for example, the width β shown in the drawing) forms an output data 14, and the pulse waveform part is left as an effective signal without being removed.

7. 发明专利

JPH11160386A METHOD FOR AUTOMATICALLY JUDGING PARTIAL DISCHARGE 失效
公开(公告)号：JPH11160386A
公开(公告)日：1999-06-18
申请号：JP32894997
申请日：1997-11-28
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： TOTANI ATSUSHI , TANAKA KENICHIRO , SUZUKI HIROSHI , ENDO TAKESHI , SATO HIDEO , EJIMA HIROTAKA
IPC分类号： G01R31/12 , G01R31/08
摘要： PROBLEM TO BE SOLVED: To provide a method for automatic judgement of partial discharge which accurately discriminate partial discharge from an external noise and an induced signal, and can surely capture generation of partial discharge. SOLUTION: A first and a second power cable circuits 1, 2 in which partial discharge has been detected are separated from a current flowing circuit, partial discharge measurement is performed, and detection signals between and after the separation are compared. In the case of the cable circuit 2 in which partial discharge is not generated, the detected partial discharge is an induced signal caused by partial discharge in a defective part A of the cable circuit 1, so that signal level difference does not appear before and after the separation. In the case of the cable circuit 1, the detected partial discharge signal is caused by partial discharge in the defective part A of own inside, so that the partial discharge signal which has been generated before the separation vanishes after the separation where a voltage is not applied. When the states before and after the separation are compared, the state that difference is not present in the detected signals is judged to be due to an external noise or an induced signal, and the state that the detected signal has vanished or decreased is judged to be partial discharge.

8. 发明专利

JPH04215077A PARTIAL DISCHARGE MEASURING METHOD 失效
公开(公告)号：JPH04215077A
公开(公告)日：1992-08-05
申请号：JP41016990
申请日：1990-12-12
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： KATSUTA GINZO , TOTANI ATSUSHI , ENDO TAKESHI , SUZUKI HIROSHI , IMAI TOMOAKI
IPC分类号： G01R27/18 , G01R31/12
摘要： PURPOSE:To measure a partial discharge without exercising any influence on a power system in a live line state by determining the phase of an applied voltage through detection of the waveform of a current flowing through a sheath to an earthing line and comparing the phase with the phase of a measuring high frequency pulse. CONSTITUTION:The sheath of a single core power cable 11 is connected at a point 11a to an earth line 23, and a high frequency core 24 and a partial discharge measuring device 17 are connected to the earth line 23. A high frequency pulse detected by a measuring device 17 is fed to a CRT 15. Meanwhile, the charge current of the earth line 23 is detected by a current transformer 28, and after the charge current is converted into a waveform signal by means of a waveform converter 30, the waveform signal is fed to the CRT 15 and monitored simultaneously with monitoring of a high frequency pulse. The phase of a charge current responding to an applied voltage and a high frequency pulse are simultaneously monitored by means of the CRT 15. Since the frequency of the generation of a partial discharge pulse at a time when an applied voltage is in a specified phase is high, a pulse generated in the specified phase can be decided as a partial discharge pulse to measure a partial discharge.

9. 发明专利

JP2001116793A METHOD FOR REMOVING EXTERNAL NOISE 失效
公开(公告)号：JP2001116793A
公开(公告)日：2001-04-27
申请号：JP29360699
申请日：1999-10-15
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： GOTO TAKESHI , HORI YOSHIKATSU , SUZUKI HIROSHI , SATO HIDEO , ENDO TAKESHI , EJIMA HIROTAKA
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To provide a method for removing external noise capable of removing the noise in a real time by a simple method without distorting a signal waveform. SOLUTION: A measurement signal from a power cable line or the like is sampled by a predetermined sampling frequency to generate predetermined digital data 12 in a plurality of sections set to a measuring cycle, and a threshold value Vth is set to the cycle. The value Vth is set to Vth=A.Pa0k(j)+B, where A, B, C and D are constants by dividing a measuring cycle k (k=1, 2, 3,...) into sections j (j=1, 2, 3,...) of a predetermined time width, setting i-th digital data in the section j of k-th cycle to Pk (j.i), setting the weighted average of the data in the section j of the k-th cycle to Pa0k(j), setting the maximum value of the data in the section j of the k-th cycle to Pa1k(j), where it is set by Pa0k(j)=C.Pa0k-1(j)+D.Pa1k(j), and the data for satisfying Pk (j, i)>Vth is output as partial discharge signal.

10. 发明专利

JPH09178801A METHOD OF DETECTING PARTIAL DISCHARGE 失效
公开(公告)号：JPH09178801A
公开(公告)日：1997-07-11
申请号：JP34270895
申请日：1995-12-28
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： NAKATOGAWA YUTAKA , KURATA MAMORU , ENDO TAKESHI , TASHIRO TSUTOMU , SUZUKI HIROSHI , IMAI TOMOAKI
IPC分类号： G01R31/12
摘要： PROBLEM TO BE SOLVED: To improve the detecting sensitivity of partial discharge generated in a general connecting part by extracting a partial discharge signal through the metal shielding layer of the general connecting part having the edge-cut metal shielding layer formed on the circumference of an external semiconductive layer. SOLUTION: A general connecting part has a connecting sleeve 8, an extruded reinforcing insulating part 10, and an external semiconductive layer 12, and a metal shielding layer 14, and is constituted in such a manner that a high frequency iron core 20 is generally separated from a jumper wire 19, whereby copper pipes 16 on both sides of an insulating cylinder 18 are laid in short-circuited state, and the iron core 20 is installed to the jumper wire 19 in measurement, whereby the copper pipes 16 are laid in the insulated state to high frequency signal. In partial discharge measurement, the iron core 20 is installed to the jumper wire 19 to lay the copper pipes 16 into the insulated state to high frequency signal. When a partial discharge is generated in this state, the partial discharge pulse is guided between the copper pipes 16, and detected through a pair of metal foil electrodes 21. The potential difference generated in a detecting impedance 23 is synchronized and amplified with a highest S/N frequency by a partial discharge measuring instrument 23.

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