GB388454A - Improvements in or relating to protective gear for alternating current systems - Google Patents
Improvements in or relating to protective gear for alternating current systemsInfo
- Publication number
- GB388454A GB388454A GB2558531A GB2558531A GB388454A GB 388454 A GB388454 A GB 388454A GB 2558531 A GB2558531 A GB 2558531A GB 2558531 A GB2558531 A GB 2558531A GB 388454 A GB388454 A GB 388454A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lines
- transformers
- bus
- line
- auxiliary
- 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
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
- H02H3/28—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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Cable Accessories (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
388,454. Protective cut-out systems. ROSS, T. W., 10, Broadoaks Road, Sale, Cheshire, and ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Crown House, Aldwych, London. Sept. 11, 1931, No. 25585. [Class 38 (v).] Protection of bus-bars S to which incoming or outgoing lines A, B, C or generators or transformers are connected is afforded by means of an induction relay, as 2a, associated with, and controlling the connection of, each line. Each relay has a field winding 3a energized by current transformers 6a in its particular line so as to be responsive to residual current in that line, and an operating winding 4a connected across the secondary of an auxiliary transformer, the primary of which is in series with the field winding 3a. The secondaries of the auxiliary transformers 8a, 8b, 8c are connected in a closed pilot circuit P, in which normally no current flows, but on the occurrence of a fault on the bus-bars producing a residual current in one or more lines, the auxiliary transformer appropriate to that line or lines will energize all the operating windings 4a over the pilot circuit P, and the relays of which the field windings 3a receive residual current will cut out the appropriate lines. With an external fault the currents induced in the circuit P cancel one another out so that the relays do not operate. Preferably relays of the " Translay " type are used so as to provide restraint by means of their biasing windings on the field magnets, and prevent creeping. Turn ratios for the transformers 6a, 8a, &c. are given in the Specification, which refers also to the use of instrument transformers existing in the lines and to tappings for the auxiliary transformers. The invention is also described in its application to a duplicate bus-bar system, Fig. 2 (not shown), in which two sources and four lines are selectively connectable to the bus-bars and each has a protective arrangement similar to that of each line of Fig. 1. In order, however, to meet the case where different lines &c. may be connected to different busbars, the pilot circuit is duplicated, each pilot circuit being associated with its own bus-bar, and tha connection of the auxiliary transformers thereto is dependent on the position of the selector switch of the line pertaining to that transformer. In addition, the bus-bar-coupler circuit-breaker is provided on either side with a similar protective arrangement so as to be included in the protected area.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2558531A GB388454A (en) | 1931-09-11 | 1931-09-11 | Improvements in or relating to protective gear for alternating current systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2558531A GB388454A (en) | 1931-09-11 | 1931-09-11 | Improvements in or relating to protective gear for alternating current systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB388454A true GB388454A (en) | 1933-03-02 |
Family
ID=10230053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2558531A Expired GB388454A (en) | 1931-09-11 | 1931-09-11 | Improvements in or relating to protective gear for alternating current systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB388454A (en) |
-
1931
- 1931-09-11 GB GB2558531A patent/GB388454A/en not_active Expired
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