Title:
【発明の名称】送電線の短絡故障区間検出方法
Document Type and Number:
Japanese Patent JPH07106023
Kind Code:
B2
Abstract:
PURPOSE:To detect a short-circuit trouble zone without information transmitting means between iron towers by discriminating the direction of the short-circuit trouble point of both end power source system by a sensor mounted near a power line of specific phase of the tower or a support. CONSTITUTION:A voltage sensor K, a current sensor P are provided near 3-phase AC power lines A, B, C, the output of the sensor P is input to the comparator 2 of a phase comparator 1, and when it is larger than a reference voltage, a zero-cross comparator 4 is operated. The comparator 4 waveform- shapes the waveforms of the sensors P, K at a zero-cross point. An AND circuit 6 compares the phases of both, and operates an indicator 9 by an integrator 7, a display circuit 8 if both are in phase.
Inventors:
Kondo Minoru
Kazunori Sugimachi
Kazunori Sugimachi
Application Number:
JP17430388A
Publication Date:
November 13, 1995
Filing Date:
July 12, 1988
Export Citation:
Assignee:
Nishim Electronics Co., Ltd.
International Classes:
H02H3/353; G01R25/00; G01R31/08; (IPC1-7): H02H3/353; G01R31/08
Domestic Patent References:
| JP59188327A |
Attorney, Agent or Firm:
Masashi Kobori (1 person outside)