Title:
DC HIGH VOLTAGE GROUND RELAY
Document Type and Number:
Japanese Patent JP2023035317
Kind Code:
A
Abstract:
To provide an erroneous detection prevention type DC voltage ground relay having a high reliability so as to prevent train operations from being affected without malfunction due to ground faults on a secondary side line of high-voltage distribution transformers installed in DC substations for electric railways, and so on.SOLUTION: A DC high voltage ground relay includes: a potential difference measurement unit 5 that is provided between a ground mat 3 and a return line 4 of a DC substation 2 for an electric railway and measures the potential difference; a DC ground fault determination output unit 6 that determines a DC ground fault using the potential difference and outputs a DC ground fault signal Fd; and a malfunction prevention unit 13 that prevents the DC ground fault determination output unit 6 from outputting the determination of the DC ground fault signal Fd when the potential difference occurred between the ground mat 3 and the return line 4 is due to a ground fault in an AC electric circuit 2A.SELECTED DRAWING: Figure 1
Inventors:
KAWAHARA TAKAHARU
NAGAMORI MASAKI
HATANAKA KAZUAKI
OGURA TAKESHI
YAMAZAKI YOSUKE
YOSHIO MINAKO
NAGAMORI MASAKI
HATANAKA KAZUAKI
OGURA TAKESHI
YAMAZAKI YOSUKE
YOSHIO MINAKO
Application Number:
JP2021142087A
Publication Date:
March 13, 2023
Filing Date:
September 01, 2021
Export Citation:
Assignee:
TSUDA ELECTRIC METERS CO LTD
International Classes:
H02H3/16; B60M3/00
Attorney, Agent or Firm:
Hideo Fujimoto
Eiji Fujimoto
Yukishiro Nishimura
Eiji Fujimoto
Yukishiro Nishimura