GB1436861A - Circuit arrangement for monitoring the heating-up of a device to be protected through which current flows - Google Patents

Circuit arrangement for monitoring the heating-up of a device to be protected through which current flows

Info

Publication number
GB1436861A
GB1436861A GB4357473A GB4357473A GB1436861A GB 1436861 A GB1436861 A GB 1436861A GB 4357473 A GB4357473 A GB 4357473A GB 4357473 A GB4357473 A GB 4357473A GB 1436861 A GB1436861 A GB 1436861A
Authority
GB
United Kingdom
Prior art keywords
frequency
pulses
converter
counter
generator
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
GB4357473A
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.)
ABB Training Center GmbH and Co KG
Original Assignee
Hartmann and Braun AG
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
Priority claimed from DE19722245605 external-priority patent/DE2245605C3/en
Priority claimed from DE19722258174 external-priority patent/DE2258174C3/en
Priority claimed from DE19732337372 external-priority patent/DE2337372C3/en
Application filed by Hartmann and Braun AG filed Critical Hartmann and Braun AG
Publication of GB1436861A publication Critical patent/GB1436861A/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
    • H02H3/093—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 with timing means
    • H02H3/0935—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 with timing means the timing being determined by numerical means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images
    • H02H6/005—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images using digital thermal images

Abstract

1436861 Overcurrent protective systems HARTMANN & BRAUN AG 17 Sept 1973 [16 Sept 1972 28 Nov 1972 23 July 1973] 43574/73 Heading H2K An overcurrent protective system particularly for preventing overheating of motors M, transformers or cables, has current transformers 2 coupled to further current transformers 3 with resistors 4 arranged to provide voltage signals proportional to the currents in the lines 1, 1<SP>1</SP> 1<SP>11</SP> and a rectifier 5 arranged to feed a voltage-frequency converter 6 which has a characteristic such as to provide pulses at a frequency related to the square of the voltage input. The pulses are fed to a forwards-backwards counter 27 with output terminals 11-18 which are pulsed in turn as forward pulses are received until after all have been pulsed a supply interrupting circuit 19, 20 is operated. The terminals 11 to 18 are connected to an OR gate 26 which drives a generator pulse 10 having a set frequency and providing backward pulses to the counter 27. As long as the frequency of the pulses of the convertor 6 is smaller than the frequency of the generator 10 a constant on/off condition arises at the terminal 11 and the other terminals 12-18 are not energized. When the frequency of the converter 6 exceeds that of the generator 10 the terminals 12-18 are energized in turn at a rate dependent on the frequency difference until as terminal 18 is pulsed the circuit 19-20 is operated and a restoring arrangement 21, 8, 23 resets the converter 27. A position indicator (Fig. 2, not shown) may be connected to the counter 27 and a threshold trigger device may be provided to switch off the device at a set overcurrent value. The counter 27 may receive the operating pulses from both the converter 6 and generator 10 at the same terminal (7<SP>1</SP>) if a direction signal is provided at a further terminal (9<SP>1</SP> Figs. 3, 4, not shown). The OR gate 26 may be replaced by a stepped value resistor.
GB4357473A 1972-09-16 1973-09-17 Circuit arrangement for monitoring the heating-up of a device to be protected through which current flows Expired GB1436861A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19722245605 DE2245605C3 (en) 1972-09-16 Circuit arrangement for monitoring the heating of current-carrying protégés
DE19722258174 DE2258174C3 (en) 1972-11-28 1972-11-28 Circuit arrangement for monitoring the heating of current-carrying protégés
DE19732337372 DE2337372C3 (en) 1973-07-23 1973-07-23 Circuit arrangement for monitoring the heating of current-carrying protégés

Publications (1)

Publication Number Publication Date
GB1436861A true GB1436861A (en) 1976-05-26

Family

ID=27184713

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4357473A Expired GB1436861A (en) 1972-09-16 1973-09-17 Circuit arrangement for monitoring the heating-up of a device to be protected through which current flows

Country Status (4)

Country Link
JP (1) JPS4992534A (en)
FR (1) FR2200657B1 (en)
GB (1) GB1436861A (en)
SE (1) SE396855B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442472A (en) * 1982-03-26 1984-04-10 Siemens-Allis, Inc. Solid state trip circuit with digital timer
GB2135146A (en) * 1983-01-31 1984-08-22 Gen Electric I2t protection systems
GB2140633A (en) * 1983-04-29 1984-11-28 Plessey Co Plc Load tripping circuits
US4605982A (en) * 1983-06-22 1986-08-12 S&C Electric Company Control circuit for a circuit interrupter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH591776A5 (en) * 1975-11-14 1977-09-30 Bbc Brown Boveri & Cie

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019372A (en) * 1955-01-12 1962-01-30 Vickers Electrical Co Ltd Overheat electrical protection device
CH375071A (en) * 1960-02-03 1964-02-15 Bbc Brown Boveri & Cie A protective circuit for an electrical device that represents a thermal image
FR2029881A5 (en) * 1969-01-29 1970-10-23 Comp Generale Electricite
US3601586A (en) * 1969-02-28 1971-08-24 Intelligent Instr Inc Thermal calculator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442472A (en) * 1982-03-26 1984-04-10 Siemens-Allis, Inc. Solid state trip circuit with digital timer
GB2135146A (en) * 1983-01-31 1984-08-22 Gen Electric I2t protection systems
GB2140633A (en) * 1983-04-29 1984-11-28 Plessey Co Plc Load tripping circuits
US4605982A (en) * 1983-06-22 1986-08-12 S&C Electric Company Control circuit for a circuit interrupter

Also Published As

Publication number Publication date
FR2200657B1 (en) 1978-01-13
FR2200657A1 (en) 1974-04-19
SE396855B (en) 1977-10-03
JPS4992534A (en) 1974-09-04

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Legal Events

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