GB1348494A - Switching apparatus - Google Patents
Switching apparatusInfo
- Publication number
- GB1348494A GB1348494A GB1348494DA GB1348494A GB 1348494 A GB1348494 A GB 1348494A GB 1348494D A GB1348494D A GB 1348494DA GB 1348494 A GB1348494 A GB 1348494A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- switching means
- contacts
- switch
- firing
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
1348494 Protective arrangements; supply systems for consuming apparatus WESTING- HOUSE BRAKE & SIGNAL CO Ltd 20 Oct 1971 [18 Nov 1970] 54780/70 Headings H2K and H2H A polyphase static switching arrangement comprises a plurality of switching means 4 ... 9 connected between input terminals 1 ... 3 and output terminals for a load 10, an impedance network 18 ... 20 connected across the output terminals, and fault detecting means 21 connected between a point in that network and a reference point 25, the points normally having the same potential. In the three phase arrangement shown, the switching means comprise inverse-parallel semi-conductor controlled rectifiers with firing circuits 11 ... 16, and the reference point 25 is a neutral point provided by a further impedance network 22 ... 24. To switch on, a start switch 26 is momentarily closed to cause the firing circuit 11 to render only the rectifier 4 conducting. The resulting simulated fault causes the relay 21 to close the contacts shown to energize a relay 29. The relay 29 closes its contacts in series with a normally closed stop switch 27 to complete a holding circuit for itself and to energize the firing circuits 12 ... 16. Providing no fault exists the relay 21 releases and the firing circuit 11 is maintained energized through an isolating diode 30. The relay 21 has contacts (not shown) in an indicating or alarm circuit. An override switch 28 enables the arrangement to be used in the event of a defective relay 21. In an alternative arrange - ment the switching means 4, 6 and 8 are diodes, only the switching means 5, 7 and 9 being controlled rectifiers.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5478070 | 1970-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1348494A true GB1348494A (en) | 1974-03-20 |
Family
ID=10472059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1348494D Expired GB1348494A (en) | 1970-11-18 | 1971-10-20 | Switching apparatus |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU3517171A (en) |
| GB (1) | GB1348494A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279976A (en) * | 2021-03-12 | 2021-08-20 | 机械工业第九设计研究院有限公司 | Control method for directly starting fire-fighting water pump by pressure switch of alarm valve set |
-
1971
- 1971-10-20 GB GB1348494D patent/GB1348494A/en not_active Expired
- 1971-10-29 AU AU35171/71A patent/AU3517171A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279976A (en) * | 2021-03-12 | 2021-08-20 | 机械工业第九设计研究院有限公司 | Control method for directly starting fire-fighting water pump by pressure switch of alarm valve set |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3517171A (en) | 1973-05-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |