GB2016833A - Protection of electrical power supply systems - Google Patents

Protection of electrical power supply systems

Info

Publication number
GB2016833A
GB2016833A GB7906879A GB7906879A GB2016833A GB 2016833 A GB2016833 A GB 2016833A GB 7906879 A GB7906879 A GB 7906879A GB 7906879 A GB7906879 A GB 7906879A GB 2016833 A GB2016833 A GB 2016833A
Authority
GB
United Kingdom
Prior art keywords
phase
protection
power supply
electrical power
impedance
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
GB7906879A
Other versions
GB2016833B (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB7906879A priority Critical patent/GB2016833B/en
Publication of GB2016833A publication Critical patent/GB2016833A/en
Application granted granted Critical
Publication of GB2016833B publication Critical patent/GB2016833B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/40—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to ratio of voltage and current

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

A distance relay determines the impedance of a line section by effectively calculating the ratio of the Fourier transforms (evaluated for a particular time interval T1-T2 and frequency omega e) of (i) the line voltage Vr and (ii) the current that would flow if the line voltage were equal to Vr during the interval T1-T2 and equal to zero at all other times. This second quantity cannot be sensed directly but can be derived from the Fourier transform of the actual line current Ir. The digital relay described separately evaluates the resistive and reactive components of the impedance for both phase-phase and phase-earth faults, repeating the evaluation continuously for new periods T1-Y2.
GB7906879A 1978-02-28 1979-02-27 Protection of electrical power supply systems Expired GB2016833B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7906879A GB2016833B (en) 1978-02-28 1979-02-27 Protection of electrical power supply systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB781078 1978-02-28
GB7906879A GB2016833B (en) 1978-02-28 1979-02-27 Protection of electrical power supply systems

Publications (2)

Publication Number Publication Date
GB2016833A true GB2016833A (en) 1979-09-26
GB2016833B GB2016833B (en) 1982-07-07

Family

ID=26241683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7906879A Expired GB2016833B (en) 1978-02-28 1979-02-27 Protection of electrical power supply systems

Country Status (1)

Country Link
GB (1) GB2016833B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284546A1 (en) * 1987-03-23 1988-09-28 Siemens Aktiengesellschaft Method of testing assemblies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284546A1 (en) * 1987-03-23 1988-09-28 Siemens Aktiengesellschaft Method of testing assemblies

Also Published As

Publication number Publication date
GB2016833B (en) 1982-07-07

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19990226