GB234153A - Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current - Google Patents

Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current

Info

Publication number
GB234153A
GB234153A GB3219423A GB3219423A GB234153A GB 234153 A GB234153 A GB 234153A GB 3219423 A GB3219423 A GB 3219423A GB 3219423 A GB3219423 A GB 3219423A GB 234153 A GB234153 A GB 234153A
Authority
GB
United Kingdom
Prior art keywords
phase
current
windings
equilibrium
relating
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
GB3219423A
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.)
EMILE NICAISE
Original Assignee
EMILE NICAISE
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 EMILE NICAISE filed Critical EMILE NICAISE
Priority to GB3219423A priority Critical patent/GB234153A/en
Publication of GB234153A publication Critical patent/GB234153A/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
    • H02H3/26—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
    • H02H3/32—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

234,153. Nicaise, E. Dec. 22, 1923. Drawings to Specification. Cut-out arrangements.-Relates to the protection of polyphase circuits by means of current transformers in each phase the effects of which are compounded by connecting them separately to windings on a single transformer or to separate transformers the secondaries of which are connected together in series through a protective relay. In order to render the protection effective in the case of balanced overloads on all the phases as well as in the case of unbalanced overload due to faulty conditions, one of the windings has a different number of ampere-turns from the other two. The number of windings supplied from each phase, may be different one from another. To deal with faulty conditions when the circuit is open but under tension, resistances or capacities may be switched in between the phases to supply current to energize the protective current transformers and isolate the system when the voltage fails.
GB3219423A 1923-12-22 1923-12-22 Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current Expired GB234153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3219423A GB234153A (en) 1923-12-22 1923-12-22 Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3219423A GB234153A (en) 1923-12-22 1923-12-22 Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current

Publications (1)

Publication Number Publication Date
GB234153A true GB234153A (en) 1925-05-22

Family

ID=10334747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3219423A Expired GB234153A (en) 1923-12-22 1923-12-22 Improvements in or relating to protecting electric circuits and alternating current machines, from material disturbance of equilibrium of phase and excessive strength of current

Country Status (1)

Country Link
GB (1) GB234153A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298018A1 (en) * 1987-06-29 1989-01-04 Siemens Aktiengesellschaft Excess current releasing device with accelerated release

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298018A1 (en) * 1987-06-29 1989-01-04 Siemens Aktiengesellschaft Excess current releasing device with accelerated release
US4930038A (en) * 1987-06-29 1990-05-29 Siemens Aktiengesellschaft Current overload tripping device with leading tripping action

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