JPS54125448A - Pilot wire protective relay device - Google Patents

Pilot wire protective relay device

Info

Publication number
JPS54125448A
JPS54125448A JP3309578A JP3309578A JPS54125448A JP S54125448 A JPS54125448 A JP S54125448A JP 3309578 A JP3309578 A JP 3309578A JP 3309578 A JP3309578 A JP 3309578A JP S54125448 A JPS54125448 A JP S54125448A
Authority
JP
Japan
Prior art keywords
switching
pilot wire
insulating
danger
high voltage
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
JP3309578A
Other languages
Japanese (ja)
Inventor
Kiwamu Ito
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.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi 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 Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP3309578A priority Critical patent/JPS54125448A/en
Publication of JPS54125448A publication Critical patent/JPS54125448A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To cut off the insulating current transformer to be excluded from pilot wire, by switching pilot wire with a switch through the insulating current transformer without danger of high voltage invasion.
CONSTITUTION: A switching device which is composed of contact points 53,54 for switcing to switch on and off pilot wire 20, relay 5 for switching to operate contact points for switching, and an insulating transformers 6, 7 for giving switching instruction to switching relay is provided, and selecting terminal to be stopped and terminal to be used, stopped condition or used condition is switched. Pilot wire with danger of high voltage invasion can be switched by pilot wire switching device through an insulating transformer without danger of high voltage invasion, and also, the insulating current transformer T to be excluded can be cut off from pilot wire. Still, switching condition can be maintained even at stoppage of electric source for switching.
COPYRIGHT: (C)1979,JPO&Japio
JP3309578A 1978-03-24 1978-03-24 Pilot wire protective relay device Pending JPS54125448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3309578A JPS54125448A (en) 1978-03-24 1978-03-24 Pilot wire protective relay device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3309578A JPS54125448A (en) 1978-03-24 1978-03-24 Pilot wire protective relay device

Publications (1)

Publication Number Publication Date
JPS54125448A true JPS54125448A (en) 1979-09-28

Family

ID=12377096

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3309578A Pending JPS54125448A (en) 1978-03-24 1978-03-24 Pilot wire protective relay device

Country Status (1)

Country Link
JP (1) JPS54125448A (en)

Similar Documents

Publication Publication Date Title
BR8200555A (en) ELECTRIC CIRCUIT SWITCH
ES2032840T3 (en) ELECTRIC CIRCUIT BREAKER WITH SELF-EXPANSION AND WITH ROTATING ARC.
ATE63655T1 (en) ARC FLUSHING DEVICE FOR ELECTRICAL SWITCHES.
ATE41263T1 (en) SWITCHING DEVICE PROTECTED AGAINST SHORT-CIRCUIT CURRENT.
JPS54125448A (en) Pilot wire protective relay device
SE8704180L (en) circuit breaker
JPS5235569A (en) Semiconductor switch device
DK0398213T3 (en) Medium voltage switch for high rated current
JPS5395562A (en) Switch
JPS5472439A (en) Uniform-pressure underwater switchboard
JPS52149953A (en) Transistor switch circuit
EP0212136A3 (en) Earthing switch disposition for high-tension installations
HU185780B (en) Method for switching off the short-circuit current of high-voltage apparatuses, furthermore apparatus for implementing thereof
JPS5310039A (en) Leak breaker operation indicating device with protective lamp
JPS524036A (en) Starting circuit of the stabilized converter
JPS5466271A (en) Electric insect killer
JPS5436496A (en) Electric source device for fusion unit
JPS52155041A (en) Ac power relay circuit
JPS5317923A (en) Electric current source opening device of direct current chopper
GB2048599A (en) Control circuitry for gated diode switches
JPS54134347A (en) Power circuit
ES470053A1 (en) Protection system for arc welding machines (Machine-translation by Google Translate, not legally binding)
JPS5267745A (en) Switching protective device
GB882004A (en) Automatic breaking of arc in arc welding
GB1492369A (en) Heated-tool welding device