GB104571A - Creación de Inventos y Patentes con Inteligencia Artificial

GB104571A – Protective Devices for Alternating Current Electric Systems.
– Google Patents

GB104571A – Protective Devices for Alternating Current Electric Systems.
– Google Patents
Protective Devices for Alternating Current Electric Systems.

Info

Publication number
GB104571A

GB104571A
GB473316A
GB473316A
GB104571A
GB 104571 A
GB104571 A
GB 104571A
GB 473316 A
GB473316 A
GB 473316A
GB 473316 A
GB473316 A
GB 473316A
GB 104571 A
GB104571 A
GB 104571A
Authority
GB
United Kingdom
Prior art keywords
transformer
current
relay
transformers
fault
Prior art date
1916-03-31
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
GB473316A
Inventor
Albert Edward Mccoll
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.)

Individual

Original Assignee
Individual
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.)
1916-03-31
Filing date
1916-03-31
Publication date
1917-03-15

1916-03-31
Application filed by Individual
filed
Critical
Individual

1916-03-31
Priority to GB473316A
priority
Critical
patent/GB104571A/en

1917-03-15
Publication of GB104571A
publication
Critical
patent/GB104571A/en

Status
Expired
legal-status
Critical
Current

Links

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Classifications

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS

H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions

H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured

H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires

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

H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents

H02H3/28—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus

Abstract

104,571. McColl, A. E. March 31, 1916. Protective arrangements.–In the protection of transformers, generators, and feeders for singlephase or polyphase systems, a biassed or restrained reverse-current relay R<1>, Fig. 1, is employed of which the elements E<1>, E<2> are energized from the secondaries of series transformers T’, T<2> having different characteristics and connected in the two sides or ends of the protected apparatus or circuit, so that on fault development, the fault current must have a value which is a predetermined percentage of the load current before the restraint is overcome and the relay becomes operative, whereas if the apparatus or circuit remains healthy and abnormal currents flow therein, the restraint is still further increased and additional stability given to the protective means by reason of the difference in the characteristics of the transformers. In the arrangement shown in Fig. 1 for the protection of a transformer A, B, the current transformer T’ in the primary side has 5 per cent. less capacity than the transformer T<2> in the secondary side, and the transformers are connected to the relay as shown so that the 5 per cent. excess current from the transformer T<2> flows through the element E’ in a direction to restrain the relay, while the element E<2> is held at relatively constant polarity by the current from the transformer T’. Should a fault develop when the transformer is supplying load alone, it is necessary for the fault current to exceed 5 per cent. of the load before the transformer T<1>, sending its excess current through the element E’ in the reverse direction, causes the relay to operate and open switches S<1>, S<2>. On the flow of excessive currents, the transformer T<1> fails to maintain its ratio, whereas the transformer T<2> does maintain its ratio, the transformers being designed with these different characteristics. Consequently, with very large currents contributed by the healthy apparatus to a fault beyond its terminals, the relatively increased current supplied to the relay by the transformer T<2> increases the percentage restraint of the relay. A fuse F’ affords time-element overload protection on sustained overload by diverting the current from the transformer T<1> through the element E<1>. In the case of a star-connected generator, the transformers corresponding to T’ are placed in each phase at the star-point end of the generator. The application to a single feeder is shown in Fig. 3, in which the biassed reverse-current relay is placed at the supply end Y of the feeder and serves to open switches at both ends, that at the far end being actuated by means of a pilot wire. Arrangements are also described in which, instead of obtaining the restraint by an unbalanced circulating- current system, the current transformer circuits are separated and the bias of the relay afforded by providing the relay with a third or restraining element. The Provisional Specification describes also systems for the protection of parallel feeders by means of mechanical balance or by wattmetertype relays. Specification 104,518 is referred to.

GB473316A
1916-03-31
1916-03-31
Protective Devices for Alternating Current Electric Systems.

Expired

GB104571A
(en)

Priority Applications (1)

Application Number
Priority Date
Filing Date
Title

GB473316A

GB104571A
(en)

1916-03-31
1916-03-31
Protective Devices for Alternating Current Electric Systems.

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB473316A

GB104571A
(en)

1916-03-31
1916-03-31
Protective Devices for Alternating Current Electric Systems.

Publications (1)

Publication Number
Publication Date

GB104571A
true

GB104571A
(en)

1917-03-15

Family
ID=32245138
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB473316A
Expired

GB104571A
(en)

1916-03-31
1916-03-31
Protective Devices for Alternating Current Electric Systems.

Country Status (1)

Country
Link

GB
(1)

GB104571A
(en)

1916

1916-03-31
GB
GB473316A
patent/GB104571A/en
not_active
Expired

Información de contacto