JPS641422A - Ground fault protection relay - Google Patents

Ground fault protection relay

Info

Publication number
JPS641422A
JPS641422A JP15574587A JP15574587A JPS641422A JP S641422 A JPS641422 A JP S641422A JP 15574587 A JP15574587 A JP 15574587A JP 15574587 A JP15574587 A JP 15574587A JP S641422 A JPS641422 A JP S641422A
Authority
JP
Japan
Prior art keywords
phase
voltage
difference
zero
ground
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15574587A
Other languages
Japanese (ja)
Other versions
JP2600682B2 (en
JPH011422A (en
Inventor
Mitsuyasu Furuse
Takaaki Kai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP15574587A priority Critical patent/JP2600682B2/en
Publication of JPH011422A publication Critical patent/JPH011422A/en
Publication of JPS641422A publication Critical patent/JPS641422A/en
Application granted granted Critical
Publication of JP2600682B2 publication Critical patent/JP2600682B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To detect a ground fault accident feeder with high sensitivity and adequacy, by discriminating ground fault phase from the change width of zero- phase voltage and the sum of two-phase phase voltage, and by phase-comparing the voltage and zero-phase current with each other.
CONSTITUTION: At the same time as zero-phase voltage, VO is input-stored in a storage circuit 1, a difference ▵VO between a present value V0i and a value VO(i-1)before a fixed time is found by an arithmetic circuit 2, and the input to a first phase comparing circuit 3 is provided. The input of respective phase voltage VA, VB, VC to the first phase comparing circuit 3 is also provided, and respective voltage VB+VC, VA+VC, VB+VA and the difference ▵VO are phase-compared with each other, and when the voltage VB+VC and the difference ▵VO are within a constant phase difference, then it is discriminated that the voltage is for A-phase ground. In the same manner also in case of the difference ▵VO and the voltage VA+VC, VA+VB, it is discriminated that the voltage is for B-phase ground or for C-phase ground. As this comparison result, by a second phase comparing circuit 4, zero-phase current IO and the voltage VB+VC, VA+VC, VA+VB are phase-compared with each other, and as its result, an accident feeder can be selectively interrupted.
COPYRIGHT: (C)1989,JPO&Japio
JP15574587A 1987-06-23 1987-06-23 Ground fault protection relay Expired - Fee Related JP2600682B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15574587A JP2600682B2 (en) 1987-06-23 1987-06-23 Ground fault protection relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15574587A JP2600682B2 (en) 1987-06-23 1987-06-23 Ground fault protection relay

Publications (3)

Publication Number Publication Date
JPH011422A JPH011422A (en) 1989-01-05
JPS641422A true JPS641422A (en) 1989-01-05
JP2600682B2 JP2600682B2 (en) 1997-04-16

Family

ID=15612501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15574587A Expired - Fee Related JP2600682B2 (en) 1987-06-23 1987-06-23 Ground fault protection relay

Country Status (1)

Country Link
JP (1) JP2600682B2 (en)

Also Published As

Publication number Publication date
JP2600682B2 (en) 1997-04-16

Similar Documents

Publication Publication Date Title
DE3887958T2 (en) Protection relay.
EP0352951A3 (en) A.c. generator fault detector
JPS641422A (en) Ground fault protection relay
GB1525475A (en) Phase failure-and null current-detector especially for an electronic motor protection relay possessing current-dependent triggering
ES8103469A1 (en) Static instantaneous overcurrent relay with low transient overreach
JPS54115174A (en) Current detector
JPS5366548A (en) Grounding fault detector for dc circuit
JPS5471347A (en) State detector
JPS53135438A (en) Detection method of distance of short-circuit fault
JPS5679223A (en) Detecting system for instantaneous torque of ac motor
JPS52147748A (en) Phaseless voltage detector
JPS54106839A (en) Grounding detector
JPS54162150A (en) Power supply observer
JPS54162149A (en) Neutral grounding monitor of generator
JPS5496755A (en) Static relay
JPS5352901A (en) Detection and detector for fault point in motor
JPS54122844A (en) Earthing protection relay system
JPS5355757A (en) Power line protection
JPS5254932A (en) Relay system of detecting one line grounding accident
JPS54108247A (en) Static type protective relay
JPS547127A (en) Overcurrent detector for inverter
JPS52140842A (en) Defectiveness detecting system for differential protection relay system
JPS5332358A (en) Detuning protection for electrical power system
JPS54157245A (en) Bus bar selecting relay device
JPS5421550A (en) Protective relay system

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees