GB258961A - Improvements in or relating to protective apparatus for alternating current electriccircuits - Google Patents

Improvements in or relating to protective apparatus for alternating current electriccircuits

Info

Publication number
GB258961A
GB258961A GB1721225A GB1721225A GB258961A GB 258961 A GB258961 A GB 258961A GB 1721225 A GB1721225 A GB 1721225A GB 1721225 A GB1721225 A GB 1721225A GB 258961 A GB258961 A GB 258961A
Authority
GB
United Kingdom
Prior art keywords
relay
contact
circuit
coil
overload
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
GB1721225A
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and Co Ltd
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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB1721225A priority Critical patent/GB258961A/en
Publication of GB258961A publication Critical patent/GB258961A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency 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

Landscapes

  • Breakers (AREA)

Abstract

258,961. Reyrolle & Co., Ltd., A., and Biles, R. W. July 4, 1925. Cut-out arrangements; induction relays.-The tripping-coil C<2>, Fig. 1, of an overload circuit-breaker is energized from the secondary B' of a current transformer in the circuit to be protected through a relay A so that, normally, the relay alone is in circuit with the secondary winding but, when an overload or other disturbance occurs, the tripping coil is connected with the secondary winding and the relay is cut out of circuit. As shown in Fig. 1, on overload &c. the relay contact-member A<1> is carried over from contact A<3> to A<2> to effect the desired connections. In order to ensure that the current in the relay coil is not broken until it has effected the necessary switching action, the contact-member A may be provided with two springy contacts one of which does not leave the contact A<3> until the other has reached the contact A<2>. Alternatively the fixed contacts may be close together and a broad movable contact-member used to ensure the same result. The contact-member may be automatically retained in its displaced position by a hand-released detent F<4>, Fig. 2. In the arrangement shown in Fig. 2, an induction relay is employed and operates the contact-member by winding up a cord E<3> so that a time-lag is introduced into the action. The contact-member switches the supply from the transformer secondary H<1> over from the relay coil D to the tripping coil H. The relay may normally short-circuit the tripping coil and, on overload, remove the short-circuit and then short-circuit the relay. As applied to a balanced protective system of the Merz-Price type the relays T, Fig. 7, are in the pilot wire circuit and serve to connect the tripping coils S across the reverse-delta-connected transformers R, R<1>, R<2>.
GB1721225A 1925-07-04 1925-07-04 Improvements in or relating to protective apparatus for alternating current electriccircuits Expired GB258961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1721225A GB258961A (en) 1925-07-04 1925-07-04 Improvements in or relating to protective apparatus for alternating current electriccircuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1721225A GB258961A (en) 1925-07-04 1925-07-04 Improvements in or relating to protective apparatus for alternating current electriccircuits

Publications (1)

Publication Number Publication Date
GB258961A true GB258961A (en) 1926-10-04

Family

ID=10091174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1721225A Expired GB258961A (en) 1925-07-04 1925-07-04 Improvements in or relating to protective apparatus for alternating current electriccircuits

Country Status (1)

Country Link
GB (1) GB258961A (en)

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