JPS54115748A - Static protective relaying equipment - Google Patents

Static protective relaying equipment

Info

Publication number
JPS54115748A
JPS54115748A JP2212878A JP2212878A JPS54115748A JP S54115748 A JPS54115748 A JP S54115748A JP 2212878 A JP2212878 A JP 2212878A JP 2212878 A JP2212878 A JP 2212878A JP S54115748 A JPS54115748 A JP S54115748A
Authority
JP
Japan
Prior art keywords
voltage
circuit
output
constitution
modification
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
JP2212878A
Other languages
Japanese (ja)
Other versions
JPS6036687B2 (en
Inventor
Ichiro Watabe
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 Ltd
Original Assignee
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 Ltd filed Critical Hitachi Ltd
Priority to JP53022128A priority Critical patent/JPS6036687B2/en
Publication of JPS54115748A publication Critical patent/JPS54115748A/en
Publication of JPS6036687B2 publication Critical patent/JPS6036687B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Rectifiers (AREA)
  • Protection Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To facilitate the constitution or modification of a circuitry employing operational amplifiers, by connecting an AC circuit for producing the voltage signal and a DC circuit for rectifying the output from said AC circuit and performing the level detection to common potential.
CONSTITUTION: The input circuit I takes in the AC voltage through a current transformer 24 while the phase shifter J supplies a voltage 90° phase shifted from in-phase voltage to the rectifier K, which separates the voltage to positive and negative outputs then the positive output is inverted at the inverting amplifier L to negative output. Then it is supplied through the smoothing circuit M to the detecting level setter N to produce the functioning output for the protective relay. Here the AC side circuits I, J and the DC side circuits L, M are maintained through a signal line to common potential. Consequently such modification that a filter empolying an operational amplifier is inserted into AC side to take in specific frequency component can be made easily.
COPYRIGHT: (C)1979,JPO&Japio
JP53022128A 1978-03-01 1978-03-01 Static protective relay Expired JPS6036687B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53022128A JPS6036687B2 (en) 1978-03-01 1978-03-01 Static protective relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53022128A JPS6036687B2 (en) 1978-03-01 1978-03-01 Static protective relay

Publications (2)

Publication Number Publication Date
JPS54115748A true JPS54115748A (en) 1979-09-08
JPS6036687B2 JPS6036687B2 (en) 1985-08-22

Family

ID=12074240

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53022128A Expired JPS6036687B2 (en) 1978-03-01 1978-03-01 Static protective relay

Country Status (1)

Country Link
JP (1) JPS6036687B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60161388U (en) * 1984-04-04 1985-10-26 豊田合成株式会社 Automotive light emitting panel
JPH01133186U (en) * 1988-03-02 1989-09-11
JPH07210103A (en) * 1994-01-21 1995-08-11 Noda Denshi Kogyo Kk Spontaneously luminous name plate

Also Published As

Publication number Publication date
JPS6036687B2 (en) 1985-08-22

Similar Documents

Publication Publication Date Title
JPS5676637A (en) Phase synchronizing circuit
JPS57142568A (en) Earth trouble detecting device for dc power transmission system
JPS5570862A (en) Transfer paper separating device in electronic copier
JPS54115748A (en) Static protective relaying equipment
JPS5439843A (en) Ac power source
JPS5737907A (en) Fm wave detector
JPS5698984A (en) Phase inverting circuit
JPS54154057A (en) Phase comparison relay device
JPS5577210A (en) Detection circuit for differential amplifier
JPS54147442A (en) Relay inspection system for second harmonic detection
JPS54113842A (en) Anti-time eddy current relay
JPS5468940A (en) No-failure power source
JPS545771A (en) Current unbalance detecting system of antiparallel connected rectifier
JPS5465905A (en) Circuit for detecting loose contact
JPS5450368A (en) Watt meter
JPS55116220A (en) Processing of output of electromagnetic type flow meter
JPS5458845A (en) Step-out relay
JPS5518883A (en) Starter of frequecy converters
JPS5481062A (en) Relay
JPS54150655A (en) Detecting trouble of induction motor
JPS54119646A (en) Ac voltage abnormality detector
JPS5368289A (en) Minute current detector
JPS5465347A (en) Pd fault detective relay
JPS54115744A (en) Leakage detector
JPS54143847A (en) Transformer protective relaying system