GB892816A - Protective means for three-phase systems - Google Patents
Protective means for three-phase systemsInfo
- Publication number
- GB892816A GB892816A GB1153358A GB1153358A GB892816A GB 892816 A GB892816 A GB 892816A GB 1153358 A GB1153358 A GB 1153358A GB 1153358 A GB1153358 A GB 1153358A GB 892816 A GB892816 A GB 892816A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- resistors
- relay
- capacitor
- circuit
- 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
- H02H3/32—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
- H02H3/353—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 involving comparison of phase voltages
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
892,816. Protective cut-out arrangements. ROTAX Ltd. July 10, 1959 [April 11, 1958], No. 11533/58. Class 38 (5). An arrangement for protecting a three-phase motor comprises a capacitor Y and a pair of resistors R1, R2 connected in series between two phases, a rectifier MR1 connected between the star point N of the motor and the point S between the resistors, and a relay RL1 connected across the rectifier. The values of the capacitor and resistors are such that under normal conditions S and N are equipotential points, but in the event of an open circuit, short-circuit, phase reversal or earth fault, a potential difference occurs between the points and the relay RL1 is operated. The rectifier may be a full-wave rectifier, Fig. 2 (not shown). If the supply is earthed, the capacitor Y may be connected to a terminal K1 so that an earth fault can be detected. The relay RL1 may close the circuit for a warning device or automatic control means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1153358A GB892816A (en) | 1958-04-11 | 1958-04-11 | Protective means for three-phase systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1153358A GB892816A (en) | 1958-04-11 | 1958-04-11 | Protective means for three-phase systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB892816A true GB892816A (en) | 1962-03-28 |
Family
ID=9987984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1153358A Expired GB892816A (en) | 1958-04-11 | 1958-04-11 | Protective means for three-phase systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB892816A (en) |
-
1958
- 1958-04-11 GB GB1153358A patent/GB892816A/en not_active Expired
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