GB515341A - Improvements in and relating to protective systems for polyphase electric circuits - Google Patents
Improvements in and relating to protective systems for polyphase electric circuitsInfo
- Publication number
- GB515341A GB515341A GB1844938A GB1844938A GB515341A GB 515341 A GB515341 A GB 515341A GB 1844938 A GB1844938 A GB 1844938A GB 1844938 A GB1844938 A GB 1844938A GB 515341 A GB515341 A GB 515341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- motor
- line
- energized
- relay
- 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
- H02H3/12—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
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
515,341. Protective cut-out arrangements. BRITISH THOMSON-HOUSTON CO., Ltd., and BOURNE, S. N. June 21, 1938, No. 18449. [Class 38 (v)] A protective system for a two- or three-phase motor comprises the provision of voltage relays for determining whether the conditions are suitable for connecting the motor to the line, and preventing connection unless all phases of the line are energized, and series coil relays for disconnecting the motor if one phase becomes opencircuited while the motor is running. The invention is applicable to motors which are started automatically by means of tappet, float, or compressor switches. The supply L<1> ... L<3> is adapted to be connected to the motor terminals A ... C by a contactor 1, the closing coil K of which is energized, on closure of switch P, only if all the star connected voltage - relay coils D ... F are energized and their contacts d ... f thereby closed. Relay coils L ... N in the lines thereupon close their contacts l ... n and are adapted to maintain them closed with the minimum (magnetizing) line-current. If a line is opencircuited, the corresponding contact l, or m, or n opens and introduces into the circuit of coil K a heater H which, after a time-delay, opens the contact of a relay G and de-energizes the coil F. Contact f thereupon opens and de-energizes the coil K, so opening the contactor 1. The contacts of relay G are adapted to be latched open and reset manually or by a remote-controlled coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1844938A GB515341A (en) | 1938-06-21 | 1938-06-21 | Improvements in and relating to protective systems for polyphase electric circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1844938A GB515341A (en) | 1938-06-21 | 1938-06-21 | Improvements in and relating to protective systems for polyphase electric circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB515341A true GB515341A (en) | 1939-12-01 |
Family
ID=10112624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1844938A Expired GB515341A (en) | 1938-06-21 | 1938-06-21 | Improvements in and relating to protective systems for polyphase electric circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB515341A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4354214A (en) | 1979-09-11 | 1982-10-12 | Walton John F | Motor protection circuit |
-
1938
- 1938-06-21 GB GB1844938A patent/GB515341A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4354214A (en) | 1979-09-11 | 1982-10-12 | Walton John F | Motor protection circuit |
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