JPS648820A - Current-type differential relay - Google Patents

Current-type differential relay

Info

Publication number
JPS648820A
JPS648820A JP62160874A JP16087487A JPS648820A JP S648820 A JPS648820 A JP S648820A JP 62160874 A JP62160874 A JP 62160874A JP 16087487 A JP16087487 A JP 16087487A JP S648820 A JPS648820 A JP S648820A
Authority
JP
Japan
Prior art keywords
current
differential
relay
detecting means
sensitivity
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
JP62160874A
Other languages
Japanese (ja)
Inventor
Takao Fujisawa
Ryotaro Kondo
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
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 filed Critical Toshiba Corp
Priority to JP62160874A priority Critical patent/JPS648820A/en
Publication of JPS648820A publication Critical patent/JPS648820A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To enable the error output of a differential relay to be prevented from being generated, by detecting the change of the scale of difference current before compensating charging current, and by lowering differential detecting sensitivity in case that the scale of the difference current is of a specified value or lese. CONSTITUTION:A current-type differential relay 10 is composed of a charging current compensation quantity computing means 11, a differential current detecting means 12, a change component detecting means 13, and an arithmetic means 14. By the charging current compensation quantity computing means 11, the input of the voltage of a self end is provided and a compensation quantity for charging current is computed. By the differential current detecting means 12, the input of the current of a self end and a remote end is provided and difference current is detected, and it is detected by the detecting means 13 whether the change component of the difference current is of a specified value or more, or not, and according to its result, the sensitivity of the relay is changed. Without lowering the sensitivity of the relay, discrimination output may be locked.
JP62160874A 1987-06-30 1987-06-30 Current-type differential relay Pending JPS648820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62160874A JPS648820A (en) 1987-06-30 1987-06-30 Current-type differential relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62160874A JPS648820A (en) 1987-06-30 1987-06-30 Current-type differential relay

Publications (1)

Publication Number Publication Date
JPS648820A true JPS648820A (en) 1989-01-12

Family

ID=15724236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62160874A Pending JPS648820A (en) 1987-06-30 1987-06-30 Current-type differential relay

Country Status (1)

Country Link
JP (1) JPS648820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189589A (en) * 1989-09-25 1993-02-23 Bodenseewerk Geratetechnik Gmbh Power controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189589A (en) * 1989-09-25 1993-02-23 Bodenseewerk Geratetechnik Gmbh Power controller

Similar Documents

Publication Publication Date Title
GB1476209A (en) Electrical sensing apparatus for particle-analyzing device
EP0189589A3 (en) An electronic balance
US4201472A (en) Apparatus for converting light signals into digital electrical signals
JPS648820A (en) Current-type differential relay
MY106186A (en) Image signal average picture level detecting apparatus.
ES8608174A1 (en) Circuit for detecting the passage through zero of the signal generated by an electromagnetic sensor of the phonic wheel type.
GB1375556A (en)
JPS6466569A (en) Method for measuring partial discharge
GB2009947A (en) Bridge circuit
JPS55149028A (en) Load detector
JPS55110444A (en) Failure detection circuit
SE8504913L (en) METHOD AND DEVICE FOR EDGE DETECTION OF PROVOBJECT
JPS55134508A (en) Phase difference detecting circuit
JPS57125856A (en) Phase difference detecting device
JPS5595180A (en) Error correcting unit of integrator
SU961121A1 (en) Pulse width amplifier
JPS6423718A (en) Differential current relay
JPS5319873A (en) Automatic balance type measuring instrument
JPS6480842A (en) X-ray analyzer
JPS5774670A (en) Tester for construction work
JPS5714712A (en) Detector for physical quantity
SU674993A1 (en) Device for measuring magnetic susceptibility of iron ore material
JPS57135323A (en) Electronic balance
JPS5726717A (en) Scale
JPS6460223A (en) Excess current detector for motor