JPS54129342A - Ground-fault protective device - Google Patents

Ground-fault protective device

Info

Publication number
JPS54129342A
JPS54129342A JP3603578A JP3603578A JPS54129342A JP S54129342 A JPS54129342 A JP S54129342A JP 3603578 A JP3603578 A JP 3603578A JP 3603578 A JP3603578 A JP 3603578A JP S54129342 A JPS54129342 A JP S54129342A
Authority
JP
Japan
Prior art keywords
fault
ground
transformer
earth
section
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.)
Pending
Application number
JP3603578A
Other languages
Japanese (ja)
Inventor
Kihachirou Itou
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3603578A priority Critical patent/JPS54129342A/en
Publication of JPS54129342A publication Critical patent/JPS54129342A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To limit the section of power source disconnection to a minimum when in a ground-fault, by operating a disconnection for the section of ground-fault as well as by operating selectively a ground-fault detection at every secondary system of the transformer.
CONSTITUTION: With a ground-fault caused at a point F1, a closed circuit is constructed by a transformer 21, 22, the earth point F1 and an earth phase 26, 33, with an earth current flowing, and in an earth overcurrent relay 31 connected to the secondary side of a current transformer 32, flows a current doubled in a direction. And other relays 29, 30 of the same kind, though also working, firstly close operational contacts 29-a, 30-a, 31-a of each relay, causing a time limit operational timer 41 to be energized, with a bus MCB25 disconnected after elasped a prescribed length of time, the sound system side is separated from the fault system side. And the relays 30, 31 in the fault system side continue the operation, with a time limit operational timer 45 actuated after elasped a prescribed length of time, to disconnect a scondary MCB24 in a system of the transformer 22. In this way, the power source breaking section when in a ground-fault can be limited to a minimum range.
COPYRIGHT: (C)1979,JPO&Japio
JP3603578A 1978-03-30 1978-03-30 Ground-fault protective device Pending JPS54129342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3603578A JPS54129342A (en) 1978-03-30 1978-03-30 Ground-fault protective device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3603578A JPS54129342A (en) 1978-03-30 1978-03-30 Ground-fault protective device

Publications (1)

Publication Number Publication Date
JPS54129342A true JPS54129342A (en) 1979-10-06

Family

ID=12458449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3603578A Pending JPS54129342A (en) 1978-03-30 1978-03-30 Ground-fault protective device

Country Status (1)

Country Link
JP (1) JPS54129342A (en)

Similar Documents

Publication Publication Date Title
ES466743A1 (en) Protective relay circuit for interphase faults
ES447481A1 (en) Circuit interrupter with ground fault trip control
SE7906664L (en) EFFEKTBRYTARSYSTEM
JPS54129342A (en) Ground-fault protective device
EP0739072A3 (en) Earth leakage circuit breaker
GB1533931A (en) Method and arrangement for reducing mechanical stress of generator equipment
JPS5485365A (en) Protector for on-load tap changer
GB559422A (en) Improvements in and relating to protective arrangements for electric apparatus
JPS5472439A (en) Uniform-pressure underwater switchboard
JPS54132739A (en) Switching device of bus bar
SU705586A1 (en) Device for protecting against current leakage to the ground in insulated neutral three-phase network
JPS5454252A (en) Earthing protection device
JPS5296336A (en) Protection device for circuit breaker
JPS5458848A (en) Circuit protector
JPS54113045A (en) Protective relay
JPS54108245A (en) Protective relay system
JPS6477421A (en) Network incoming apparatus
JPS53147947A (en) Digital protective relay
JPS5447975A (en) Control circuit
JPS5457139A (en) Secondary winding shortage accident detector for network transformer
JPS5499951A (en) Device for interlocking electric apparatuses
CN2064954U (en) On-column loaded oil switch with grounded protection device
JPS5475050A (en) Carrier protective relay
SE8504396D0 (en) GROUND FAULT CURRENT INTERRUPTER CIRCUIT WITH OPEN NEUTRAL AND GROUND LEAD PROTECTION
JPS5468950A (en) Short-circuit protective relay system