JPS54142548A - Protective relay system for transformer - Google Patents

Protective relay system for transformer

Info

Publication number
JPS54142548A
JPS54142548A JP4999878A JP4999878A JPS54142548A JP S54142548 A JPS54142548 A JP S54142548A JP 4999878 A JP4999878 A JP 4999878A JP 4999878 A JP4999878 A JP 4999878A JP S54142548 A JPS54142548 A JP S54142548A
Authority
JP
Japan
Prior art keywords
circuit
output
working
winding
internal trouble
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
JP4999878A
Other languages
Japanese (ja)
Other versions
JPS5838054B2 (en
Inventor
Hiroshi Sasaki
Yoshiteru Miki
Yoshinobu Miyazaki
Yasuro Akisawa
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 JP4999878A priority Critical patent/JPS5838054B2/en
Publication of JPS54142548A publication Critical patent/JPS54142548A/en
Publication of JPS5838054B2 publication Critical patent/JPS5838054B2/en
Expired legal-status Critical Current

Links

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  • Protection Of Transformers (AREA)

Abstract

PURPOSE:To decide an operation of the breaker by both forces such as the working force of the vectors sum of three-winding pass current and the suppressing force by two-winding pass current except a winding overcurrent connected to the variable power supply with the static capacitor. CONSTITUTION:The fundamental wave pass circuit 34 and the second harmonic pass circuit 35 are provided, the absolute values of respective outputs are compared with each other by the comparator 36. When the output of circuit 34 is greater than that of the circuit 35 a specific quantity, the possibility of an internal trouble of the transformer is considered and the working output is provided. Also an output of the second differential circuit 32 is a working quantity of the ratio differential element to select an internal trouble exactly, and is a signal output by which the ratio differential element is made a scalar suppressing quantity. When the absolute value of the differential circuit 32 is greater than that of the scalar detecting circuit 33 a specific quantity, the comparator 37 decides that an internal trouble occurs, and produces a working output. The coincidence gate 38 decides an internal trouble of the protected transformer according to only the condition of coincidence of both outputs of the comparators 36 and 37, and gives a cut-off command to the breaker (3P--3T).
JP4999878A 1978-04-28 1978-04-28 Transformer protection relay method Expired JPS5838054B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4999878A JPS5838054B2 (en) 1978-04-28 1978-04-28 Transformer protection relay method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4999878A JPS5838054B2 (en) 1978-04-28 1978-04-28 Transformer protection relay method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP15648178A Division JPS54143848A (en) 1978-12-20 1978-12-20 Transformer protective relaying system

Publications (2)

Publication Number Publication Date
JPS54142548A true JPS54142548A (en) 1979-11-06
JPS5838054B2 JPS5838054B2 (en) 1983-08-20

Family

ID=12846666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4999878A Expired JPS5838054B2 (en) 1978-04-28 1978-04-28 Transformer protection relay method

Country Status (1)

Country Link
JP (1) JPS5838054B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6116448U (en) * 1984-07-03 1986-01-30 株式会社クボタ Double bite prevention mechanism for hydraulically operated gear transmissions

Also Published As

Publication number Publication date
JPS5838054B2 (en) 1983-08-20

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