GB1415534A - Safety devices in electrical appliances - Google Patents

Safety devices in electrical appliances

Info

Publication number
GB1415534A
GB1415534A GB5545972A GB5545972A GB1415534A GB 1415534 A GB1415534 A GB 1415534A GB 5545972 A GB5545972 A GB 5545972A GB 5545972 A GB5545972 A GB 5545972A GB 1415534 A GB1415534 A GB 1415534A
Authority
GB
United Kingdom
Prior art keywords
phase
high voltage
circuit breaker
voltage dependent
earthed neutral
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.)
Expired
Application number
GB5545972A
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.)
Waurick Associates Pty Ltd B G
Original Assignee
Waurick Associates Pty Ltd B G
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 Waurick Associates Pty Ltd B G filed Critical Waurick Associates Pty Ltd B G
Publication of GB1415534A publication Critical patent/GB1415534A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

1415534 Protective apparatus B G WAURICK & ASSOCIATES PTY Ltd 30 Nov 1972 [9 Dec 1971] 55459/72 Heading H2H Apparatus for preventing damage to electrical circuit elements by high voltage surges which occur when circuit breakers are opened after a fault occurs comprises the parallel combination of a negative coefficient voltage dependent resistor and a surge arrestor. A three phase star connected alternator 7 having an earthed neutral is connected to a power supply system by way of a circuit breaker 6. Each of the phase lines is connected to the earthed neutral by means of a parallel connected combination of a negative coefficient voltage dependent resistor 2 and a surge arrestor device 3. If a phase to earth fault occurs in the system beyond the circuit breaker 6, the circuit breaker will open and a high voltage will be developed at the alternator terminals due to the inductances in the circuit elements. This high voltage will cause the arrestor devices 3 to respond and dissipate the excess voltages should the voltage dependent resistors 2 be insufficient to dissipate such voltages. The parallel combination of the devices 2, 3 may also be connected between phases to protect the system from phase-tophase faults. The elements 2, 3 may be encapsulated in a body of epoxy resin and provided with terminals 4, 5. A second embodiment is described for use with a system without an earthed neutral.
GB5545972A 1971-12-29 1972-11-30 Safety devices in electrical appliances Expired GB1415534A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA718249A ZA718249B (en) 1971-12-29 1971-12-29 Improvements in and relating to safety devices in electrical appliances

Publications (1)

Publication Number Publication Date
GB1415534A true GB1415534A (en) 1975-11-26

Family

ID=25564248

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5545972A Expired GB1415534A (en) 1971-12-29 1972-11-30 Safety devices in electrical appliances

Country Status (3)

Country Link
DE (1) DE2259530A1 (en)
GB (1) GB1415534A (en)
ZA (1) ZA718249B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172453A (en) * 1985-03-11 1986-09-17 Dubilier Beswick Div Overvoltage protection arrangements
EP3747100B1 (en) * 2018-01-30 2022-03-16 Hitachi Energy Switzerland AG Surge arrestor dimensioning in a dc power transmission system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089032A (en) * 1976-09-08 1978-05-09 William Dell Orfano Plug-type transient surge suppressor
US4068279A (en) * 1976-10-28 1978-01-10 Byrnes Gerald J Power monitor
JPS54124242A (en) * 1978-03-18 1979-09-27 Mitsubishi Electric Corp Arrester for transmission line
US4455586A (en) * 1980-10-24 1984-06-19 Oneac Corporation High voltage filtering and protection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172453A (en) * 1985-03-11 1986-09-17 Dubilier Beswick Div Overvoltage protection arrangements
GB2172453B (en) * 1985-03-11 1989-05-10 Dubilier Beswick Div Overvoltage protection arrangements
EP3747100B1 (en) * 2018-01-30 2022-03-16 Hitachi Energy Switzerland AG Surge arrestor dimensioning in a dc power transmission system

Also Published As

Publication number Publication date
ZA718249B (en) 1973-02-28
DE2259530A1 (en) 1973-06-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee