FR2457556A1 - Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating - Google Patents

Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating

Info

Publication number
FR2457556A1
FR2457556A1 FR7913714A FR7913714A FR2457556A1 FR 2457556 A1 FR2457556 A1 FR 2457556A1 FR 7913714 A FR7913714 A FR 7913714A FR 7913714 A FR7913714 A FR 7913714A FR 2457556 A1 FR2457556 A1 FR 2457556A1
Authority
FR
France
Prior art keywords
starting
relay
circuit
thermal
supply
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
FR7913714A
Other languages
French (fr)
Other versions
FR2457556B1 (en
Inventor
Gilles Baurand
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.)
Telemecanique SA
Original Assignee
Telemecanique Electrique SA
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 Telemecanique Electrique SA filed Critical Telemecanique Electrique SA
Priority to FR7913714A priority Critical patent/FR2457556A1/en
Publication of FR2457556A1 publication Critical patent/FR2457556A1/en
Application granted granted Critical
Publication of FR2457556B1 publication Critical patent/FR2457556B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Motor And Converter Starters (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

A bi-metallic strip thermal overload relay is suited to the protection of the starting resistances of induction motors which undergo frequent starting and has its operating temperature adjustable by varying the current in the bimetallic strip (26). This is achieved by setting, via external terminals (35,36), parallel paths comprising resistors (31) or diodes across the fixed series dropping resistor (32) in the supply to the bi-metal. The contact (25) of the thermal relay is in series with the operating coil (6) of a contactor which switches the incoming AC supply (3,4,5). The supply to the thermal relay is connected only while the starting resistances (8,9,10) are in circuit, so protecting against unnecessarily long starting procedures. The thermal inertia of the relay protects against overheating due to excessively frequent starting.
FR7913714A 1979-05-21 1979-05-21 Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating Granted FR2457556A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7913714A FR2457556A1 (en) 1979-05-21 1979-05-21 Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7913714A FR2457556A1 (en) 1979-05-21 1979-05-21 Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating

Publications (2)

Publication Number Publication Date
FR2457556A1 true FR2457556A1 (en) 1980-12-19
FR2457556B1 FR2457556B1 (en) 1981-10-02

Family

ID=9225987

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7913714A Granted FR2457556A1 (en) 1979-05-21 1979-05-21 Thermal overload protection relay - uses bimetallic strip across AC line while starting resistors are in circuit to protect them against overheating

Country Status (1)

Country Link
FR (1) FR2457556A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1549088A (en) * 1967-12-21 1968-12-06

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1549088A (en) * 1967-12-21 1968-12-06

Also Published As

Publication number Publication date
FR2457556B1 (en) 1981-10-02

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