GB555328A - Improvements in or relating to protective arrangements for three-phase a.c. distribution system - Google Patents

Improvements in or relating to protective arrangements for three-phase a.c. distribution system

Info

Publication number
GB555328A
GB555328A GB188742A GB188742A GB555328A GB 555328 A GB555328 A GB 555328A GB 188742 A GB188742 A GB 188742A GB 188742 A GB188742 A GB 188742A GB 555328 A GB555328 A GB 555328A
Authority
GB
United Kingdom
Prior art keywords
breaker
fuses
fuse
open
trip
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
GB188742A
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.)
JAMES ALFRED HARLE
A Reyrolle and Co Ltd
Original Assignee
JAMES ALFRED HARLE
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 JAMES ALFRED HARLE, A Reyrolle and Co Ltd filed Critical JAMES ALFRED HARLE
Priority to GB188742A priority Critical patent/GB555328A/en
Publication of GB555328A publication Critical patent/GB555328A/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
    • H02H3/12—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 underload or no-load
    • H02H3/13—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 underload or no-load for multiphase applications, e.g. phase interruption

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

555,328. Protective cut-out arrangements. REYROLLE & CO., Ltd., A.. and HARLE, J. A. Feb. 12, 1942, No. 1887. [Class 38 (v)] An arrangement for protecting a three-phase circuit against overload and single-phasing comprises, in each phase, a high-breaking capacity fuse C<SP>1</SP> ... C<SP>3</SP>, and a normal trip coil E<SP>1</SP> ... E<SP>3</SP> operative on trip mechanism D of a low-breaking capacity circuit-breaker B having its contacts in series with the respective fuses, the operating times being such that the breaker deals with overloads up to, say, ten times normal load, whereas the fuses open overloads in excess of that figure. When a fuse blows, single-phasing is prevented by an auxiliary trip coil F<SP>1</SP> ... F' in shunt therewith operating the mechanism D to clear the circuit. The shunt impedance is such that each coil is inoperative while the fuse is intact, but operates with the minimum voltage likely after blowing of the fuse The fuses may be withdrawable for isolating the breaker, the trip circuits being also isolated at contacts H<SP>1</SP> ... H<SP>3</SP>. Switch mechanism interlocking with lids. The circuit-breaker B and fuses C are mounted in cases L. M. Fig 3, containing the auxiliary trip coils (not shown). When the handle G is lowered to open the breaker, the rod Q disengages a lug Q<SP>2</SP> on door M<SP>1</SP>, so allowing access to the fuses. A rod O carried on arms O<SP>1</SP> is rotatable clockwise for permitting removal of all the fuse holders N, and is then urged by spring O<SP>2</SP> into a position in which rod P frees a lug P' on door L<SP>1</SP>, so enabling inspection of the breaker itself. Thus the fuses cannot be removed until the breaker is open and the breaker cannot be inspected until isolated at the fuses. The shape of lugs P<SP>2</SP>, Q<SP>2</SP> prevents movement of P, Q while the doors are open. Lugs P', Q' on the casing walls guide the rods P, Q. The Specification refers to oil-immersion of the apparatus and to other modifications of details, and to Specification 549,376.
GB188742A 1942-02-12 1942-02-12 Improvements in or relating to protective arrangements for three-phase a.c. distribution system Expired GB555328A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB188742A GB555328A (en) 1942-02-12 1942-02-12 Improvements in or relating to protective arrangements for three-phase a.c. distribution system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB188742A GB555328A (en) 1942-02-12 1942-02-12 Improvements in or relating to protective arrangements for three-phase a.c. distribution system

Publications (1)

Publication Number Publication Date
GB555328A true GB555328A (en) 1943-08-17

Family

ID=9729797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB188742A Expired GB555328A (en) 1942-02-12 1942-02-12 Improvements in or relating to protective arrangements for three-phase a.c. distribution system

Country Status (1)

Country Link
GB (1) GB555328A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548617A (en) * 1948-08-18 1951-04-10 Purpura Liborio Circuit breaker
FR2465341A1 (en) * 1979-09-11 1981-03-20 Walton John APPARATUS AND METHOD FOR PROTECTING AN ELECTRIC MOTOR

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548617A (en) * 1948-08-18 1951-04-10 Purpura Liborio Circuit breaker
FR2465341A1 (en) * 1979-09-11 1981-03-20 Walton John APPARATUS AND METHOD FOR PROTECTING AN ELECTRIC MOTOR
US4354214A (en) 1979-09-11 1982-10-12 Walton John F Motor protection circuit

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