JPS5457141A - Carrier protecting relay unit - Google Patents

Carrier protecting relay unit

Info

Publication number
JPS5457141A
JPS5457141A JP12374477A JP12374477A JPS5457141A JP S5457141 A JPS5457141 A JP S5457141A JP 12374477 A JP12374477 A JP 12374477A JP 12374477 A JP12374477 A JP 12374477A JP S5457141 A JPS5457141 A JP S5457141A
Authority
JP
Japan
Prior art keywords
output
current
produces
zero phase
sampling
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
JP12374477A
Other languages
Japanese (ja)
Other versions
JPS5944850B2 (en
Inventor
Shinichi Azuma
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP52123744A priority Critical patent/JPS5944850B2/en
Publication of JPS5457141A publication Critical patent/JPS5457141A/en
Publication of JPS5944850B2 publication Critical patent/JPS5944850B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To pervent an erroneous trip of a carrier protecting relay unit by resetting a proportional gain limiting timer for producing its output at zero phase current flowing time according to the output of a discriminator even if the accident mode varies during the accident to abruptly alter the current.
CONSTITUTION: Sampling pulses 22A, 22B are produced at 90° and 270° of zero phase voltage Vo 21 to sample zero phase current Io 23. Accordingly, a sampling- hold circuit 24 produces a negative voltage output, which increases in negative direction after the current abruptly alters. On the other hand, a sampling-hold circuit 25 produces a positive voltage output, which increases in positive direction after the current abruptly alters. The output voltages of the circuits 24, 25 are summed in an arithmetic circuit 26. When the circuit 26 produces the output voltage higher than predetermined value, a discriminator 27 detects it to produce its output signal, which resets a proportional gain limiting timer. Thus, it prevents the erroneous trip
COPYRIGHT: (C)1979,JPO&Japio
JP52123744A 1977-10-14 1977-10-14 Transport protection relay device Expired JPS5944850B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52123744A JPS5944850B2 (en) 1977-10-14 1977-10-14 Transport protection relay device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52123744A JPS5944850B2 (en) 1977-10-14 1977-10-14 Transport protection relay device

Publications (2)

Publication Number Publication Date
JPS5457141A true JPS5457141A (en) 1979-05-08
JPS5944850B2 JPS5944850B2 (en) 1984-11-01

Family

ID=14868245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52123744A Expired JPS5944850B2 (en) 1977-10-14 1977-10-14 Transport protection relay device

Country Status (1)

Country Link
JP (1) JPS5944850B2 (en)

Also Published As

Publication number Publication date
JPS5944850B2 (en) 1984-11-01

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