GB1218074A - Over-current relay - Google Patents

Over-current relay

Info

Publication number
GB1218074A
GB1218074A GB4139/68A GB413968A GB1218074A GB 1218074 A GB1218074 A GB 1218074A GB 4139/68 A GB4139/68 A GB 4139/68A GB 413968 A GB413968 A GB 413968A GB 1218074 A GB1218074 A GB 1218074A
Authority
GB
United Kingdom
Prior art keywords
gate
inverter
level detector
output
input
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
GB4139/68A
Inventor
Hans Schnabel
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.)
STARKSON ANLAGENBAU ERFURT VEB
Original Assignee
STARKSON ANLAGENBAU ERFURT VEB
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 STARKSON ANLAGENBAU ERFURT VEB filed Critical STARKSON ANLAGENBAU ERFURT VEB
Priority to GB4139/68A priority Critical patent/GB1218074A/en
Publication of GB1218074A publication Critical patent/GB1218074A/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
    • H02H3/08—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 excess current
    • H02H3/081—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 excess current and depending on the direction
    • 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
    • H02H3/38—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 both voltage and current; responsive to phase angle between voltage and current
    • H02H3/382—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 both voltage and current; responsive to phase angle between voltage and current involving phase comparison between current and voltage or between values derived from current and voltage

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1,218,074. Protective systems. STARKSTROM-ANLAGENBAU ERFURT VEB. 26 Jan., 1968, No. 4139/68. Heading H2K. An electronic directional overcurrent relay arrangement comprises an AND gate 8 receiving one input from a current transformer 1 with load resistor 9 through an adjustable phase shifter 10 and a level detector 12. The other input to the AND gate is derived through a diode limiter 6 and a level detector 7 from opposing secondary windings of voltage transformers 2, 3, one of the voltage transformer primary windings being connected in series with Zener diodes 4, 5 across the other primary winding. The AND gate 8 provides an output when the current and voltage signals have predetermined magnitudes and have a predetermined phase relationship. A " compensation " device 13 is connected between the phase shifter 10 and the level detector 7, the device 13 reducing the response threshold of the detector 7 when high overcurrent conditions occur. The output from the AND gate 8 is applied to a pulse shaper 14 and from the shaper to a monostable multivibrator 16 and an inverter 19. When an OR-gate 18 receives no signal from either the multivibrator 16 or the inverter 19, an inverter 20 provides an output signal, e.g. for tripping a circuit-breaker.
GB4139/68A 1967-12-30 1968-01-26 Over-current relay Expired GB1218074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4139/68A GB1218074A (en) 1967-12-30 1968-01-26 Over-current relay

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEV0035136 1967-12-30
GB4139/68A GB1218074A (en) 1967-12-30 1968-01-26 Over-current relay

Publications (1)

Publication Number Publication Date
GB1218074A true GB1218074A (en) 1971-01-06

Family

ID=71083313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4139/68A Expired GB1218074A (en) 1967-12-30 1968-01-26 Over-current relay

Country Status (2)

Country Link
DE (1) DE1588932A1 (en)
GB (1) GB1218074A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2917398A1 (en) * 1979-04-28 1980-10-30 Bergwerksverband Gmbh SHORT CIRCUIT PROTECTION IN LOW VOLTAGE NETWORKS

Also Published As

Publication number Publication date
DE1588932A1 (en) 1971-02-18

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