GB1334403A - Input circuit for three-phase over-current relays - Google Patents
Input circuit for three-phase over-current relaysInfo
- Publication number
- GB1334403A GB1334403A GB2402571A GB2402571A GB1334403A GB 1334403 A GB1334403 A GB 1334403A GB 2402571 A GB2402571 A GB 2402571A GB 2402571 A GB2402571 A GB 2402571A GB 1334403 A GB1334403 A GB 1334403A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- input circuit
- phase
- inductance
- direct current
- 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
- H02H3/08—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 excess current
- H02H3/083—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 excess current for three-phase systems
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
1334403 Protective arrangements ALLMANNA SVENSKA ELEKTRISKA AB 19 April 1971 [16 March 1970] 24025/71 Heading H2K An input circuit for a three-phase overcurrent relay comprises for each phase R, S, T a current transformer TR, TS, TT with a rectifier bridge LR, LS, LT connected to its secondary winding, the rectifier bridges being series-connected on the D.C. side to output terminals 4, 5. An inductance 1 and a series resistor 2 are connected across the output terminals and are so dimensioned that the sum of the voltage arising across the resistor due to the direct current output of the bridges and the voltage arising across the inductance and the resistor due to the alternating voltage component superimposed on the direct current is substantially the same for a single phase fault and a three-phase fault of the same magnitude. A further resistor 3 may be used to facilitate adjustment and high ohmic impedances RR, RS, RT may be connected across the secondary windings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE341670A SE351087B (en) | 1970-03-16 | 1970-03-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1334403A true GB1334403A (en) | 1973-10-17 |
Family
ID=20262081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2402571A Expired GB1334403A (en) | 1970-03-16 | 1971-04-19 | Input circuit for three-phase over-current relays |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH520427A (en) |
| DE (1) | DE2110505B2 (en) |
| GB (1) | GB1334403A (en) |
| SE (1) | SE351087B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2841856C3 (en) * | 1978-09-26 | 1983-02-24 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for recording the actual current value of converters in a three-phase bridge circuit |
| DE4016075A1 (en) * | 1990-05-18 | 1991-11-28 | Kloeckner Moeller Gmbh | Circuit detecting phase currents in multiphase system - uses one measurement resistance and signal processing circuit fed by controlled switching for reduced costs |
-
1970
- 1970-03-16 SE SE341670A patent/SE351087B/xx unknown
-
1971
- 1971-03-05 DE DE19712110505 patent/DE2110505B2/en active Granted
- 1971-03-10 CH CH361971A patent/CH520427A/en not_active IP Right Cessation
- 1971-04-19 GB GB2402571A patent/GB1334403A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH520427A (en) | 1972-03-15 |
| DE2110505C3 (en) | 1973-10-11 |
| SE351087B (en) | 1972-11-13 |
| DE2110505A1 (en) | 1971-09-30 |
| DE2110505B2 (en) | 1973-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PCNP | Patent ceased through non-payment of renewal fee |