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1. 发明专利

JPH068837B2 失效
公开(公告)号：JPH068837B2
公开(公告)日：1994-02-02
申请号：JP29146887
申请日：1987-11-18
申请人： KANSAI ELECTRIC POWER CO
发明人： RYOMAN AKIRA , MATSUI SHINJI , KOINE TOMONORI
IPC分类号： G01R31/02 , G01R29/18 , H02J3/00

2. 发明专利

JP2000055961A WIRELESS PHASE ROTATION INDICATOR 失效
公开(公告)号：JP2000055961A
公开(公告)日：2000-02-25
申请号：JP22291298
申请日：1998-08-06
申请人： KANSAI ELECTRIC POWER CO , KANSAI HENSEIKI KOGYO KK
发明人： MATSUI SHINJI , SEGA MAKOTO , TAKAHASHI SATORU , TAKENOUCHI HIDEAKI
IPC分类号： G01R29/18
摘要： PROBLEM TO BE SOLVED: To eliminate the need for the loading of a distribution line and the halting of a protective relay, etc., at the time of constituting a testing system, to improve reliability, and to achieve light weight and compact size by detecting a voltage waveform signal from a voltage transformer, converting it into a reference phase signal, performing comparison computation processing on a phase signal of each phase of a voltage system and the reference phase signal at a computing part, detecting and displaying the phase difference of each phase. SOLUTION: Transmission signals from phase rotation indicators 2a, 2b, and 2c are combined with the frequency of a carrier signal by the tuning circuit 29 of a receiving device 3 and are received by a detecting circuit 30 via antennas 27a, 27b, 27c. The received signal is demodulated into a reception phase signal at a demodulating circuit 32. The phase signals are transmitted to a phase rotation indicator 6 via a phase signal transmitting circuit 33 and a twisted cable 4. The signals are inputted to a phase difference detecting circuit 38 via a phase regulating circuit 37. On the other hand, a reference phase signal is detected from a VT 5 by a reference signal detecting circuit 36 and is inputted to the detecting circuit 38. The reception phase signal is compared with the reference phase signal to detect the time delay of phase differences with respect to the falling edge. A reference clock 39 for detecting phase differences is allotted to the time delay of phase differences, and its clock number is detected at a phase difference counting circuit 40.

3. 发明专利

JPH01132974A PHASE CHECKING APPARATUS FOR TRANSMISSION AND DISTRIBUTION LINE 失效
公开(公告)号：JPH01132974A
公开(公告)日：1989-05-25
申请号：JP29146887
申请日：1987-11-18
申请人： KANSAI ELECTRIC POWER CO
发明人： RIYOUMAN AKIRA , MATSUI SHINJI , KOINE TOMONORI
IPC分类号： G01R31/02 , G01R29/18 , H02J3/00
摘要： PURPOSE:To make it possible to perform phase checking work simply without removing a transmission line from electric equipment, by selecting and receiving a low frequency signal, which is applied to one end of a piece of transmission lines, with a BPF at the other end. CONSTITUTION:Low frequency signals are oscillated in oscillators 1, 2 and 3 and applied to the ends of transmission lines A3, B3 and C3. Said frequencies are represented by the product of a value, which is obtained by subtracting 1 from 2N (where N is a natural number), and values, which are 1/2 of the frequencies of the currents transmitted on the transmission lines A3, B3 and C3. The low frequency signals are selected and received with bandpass filters 11, 12 and 13 at the other ends of the transmission lines A3, B3 and C3 and displayed on level meters 16, 17 and 18. When the low frequency signal is applied to one end of a piece of the transmission lines, only the signal having that frequency is separated from the other signals and noises in the BPFs 11, 12 and 13 at the other ends. Thus the signal is detected.

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