CN2454969Y - Machine card protection apparatus for automation system of transformer substation - Google Patents
Machine card protection apparatus for automation system of transformer substation Download PDFInfo
- Publication number
- CN2454969Y CN2454969Y CN 00256481 CN00256481U CN2454969Y CN 2454969 Y CN2454969 Y CN 2454969Y CN 00256481 CN00256481 CN 00256481 CN 00256481 U CN00256481 U CN 00256481U CN 2454969 Y CN2454969 Y CN 2454969Y
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- CN
- China
- Prior art keywords
- breaker
- microcomputer
- parallel
- protection unit
- machine card
- 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 - Fee Related
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Abstract
The utility model relates to a machine card protection apparatus for a microcomputer automation system of a transformer substation. Two pins A, B of the apparatus W are connected in parallel at both ends of a close contactor coil JH. When a fault of a breaker of a transformer substation that a mechanism is clamped occurs, an auxiliary contact DL of the breaker can not be disconnected, an operation circuit of the breaker can be safely cut off by a microcomputer protection unit relay, and the microcomputer protection unit relay and a skipping and closing coil of the breaker can not be damaged, which realizes the protection function for the machine card. A capacitor and a resistor are connected in series to be connected in parallel with a diode, which forms the apparatus of the utility model.
Description
The utility model relates to a kind of in transformer station's microcomputer automated system; under the situation of the stuck fault of breaker mechanism (auxiliary contact of circuit breaker broke not open in the time of should breaking); but Microcomputer Protection unit relay output contact is the operation circuit of safety cut-off circuit breaker still, and does not damage the device of Microcomputer Protection unit relay and circuit breaker tripping coil.The utility model belongs to transformer station microcomputer comprehensive automation field.
In transformer station's microcomputer automated system, usually the disconnection in breaker operator loop will rely on the auxiliary contact of circuit breaker, in case the mechanism blockage fault appears in circuit breaker, the operation circuit that auxiliary contact just can not cut-off breaker, the tripping coil of circuit breaker will damage.If during with Microcomputer Protection unit relay output contact rupturing operation loop, the electric arc conducting that the relay output contact will occur continuing.Electric arc can make the relay of Microcomputer Protection unit burn out even burn on the one hand; Owing to the existence of electric arc, the operation circuit of circuit breaker does not disconnect yet, still can damage tripping coil on the other hand.
It is under the auxiliary contact of the circuit breaker situation that can not disconnect in mechanism blockage that the purpose of this utility model provides a kind of, but the Microcomputer Protection unit relay output contact device in safety cut-off breaker operator loop is still realized machine card protection function.
The purpose of this utility model is achieved in that by following circuit and constitutes: after resistance and the capacitances in series again with the diode parallel connection, the two ends lead-out wire from parallel connection is connected in parallel on the closing contactor coil again.Work as mechanism blockage, when the output contact of Microcomputer Protection unit relay went to cut off the breaker operator loop, contactor coil can produce self induction voltage, but self induction voltage can be limited on its conduction voltage drop by diode; And the series connection of resistance and electric capacity can make the self induction voltage at contactor coil two ends not produce transition; the self induction voltage that so just suppresses contactor coil; make between Microcomputer Protection unit relay contact and do not produce high pressure; just can not produce electric arc between the contact, thereby make the output contact of Microcomputer Protection unit relay cut off the breaker operator loop safely.
When the stuck fault of breaker mechanism occurring; can not be used for the rupturing operation loop according to conventional Microcomputer Protection unit relay output contact; otherwise can cause sustained arc; and this device can be eliminated relay output contact arcing phenomenon effectively; be implemented in breaker mechanism when stuck; the function in Microcomputer Protection unit relay output contact safety cut-off breaker operator loop has been protected relay and tripping coil.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the microcomputer automation combined floodgate partial circuit figure of transformer station after the card protection of realization machine.The auxiliary contact DL of Microcomputer Protection unit relay output contact M, circuit breaker and closing contactor coil JH be connected on direct current operative power source of substation+220V ,-220V on.This device W is connected in parallel on the contactor coil JH by pin A, B.
Fig. 2 is the internal circuit of this device W.Device W by capacitor C 1 with constitute with diode D is in parallel again after resistance R is connected, from the two ends lead-out wire of parallel connection pin A, B as device W.
Fig. 3 is the outline drawing of this device W, and A, B are pin, and the two ends two pin A, the B of this device W are connected in parallel on closing contactor coil JH have just formed Fig. 1.
In preferred embodiment of the utility model, resistance R should be high-power type, and capacitor C 1 should be high pressure resistant type with diode D.
After adding this device W; work as mechanism blockage; when the output contact of Microcomputer Protection unit relay goes to cut off the breaker operator loop; the effect of diode and electric capacity has just suppressed the self induction voltage at contactor coil JH two ends; electric arc between Microcomputer Protection unit relay contact just can not produce like this; thereby but the operation circuit of Microcomputer Protection unit relay output contact safety cut-off circuit breaker is realized machine card protection function.
Claims (1)
1. transformer station's microcomputer automated system machine card protecting device, constitute by capacitor C, resistance R and diode D, pin A, the B of device W are connected in parallel on the closing contactor coil JH, closing contactor coil JH be connected on after the auxiliary contact DL of Microcomputer Protection unit relay output contact M and circuit breaker connects direct current operative power source of substation+220V ,-220V on, constituted the operation circuit of circuit breaker; It is characterized in that: in parallel with diode D again after capacitor C and the resistance R series connection, two ends in parallel are attempted by the two ends of closing contactor coil JH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256481 CN2454969Y (en) | 2000-11-22 | 2000-11-22 | Machine card protection apparatus for automation system of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256481 CN2454969Y (en) | 2000-11-22 | 2000-11-22 | Machine card protection apparatus for automation system of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2454969Y true CN2454969Y (en) | 2001-10-17 |
Family
ID=33613190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00256481 Expired - Fee Related CN2454969Y (en) | 2000-11-22 | 2000-11-22 | Machine card protection apparatus for automation system of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2454969Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100456593C (en) * | 2006-11-14 | 2009-01-28 | 北海银河高科技产业股份有限公司 | Control circuit for intelligent breaker loop protection |
-
2000
- 2000-11-22 CN CN 00256481 patent/CN2454969Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100456593C (en) * | 2006-11-14 | 2009-01-28 | 北海银河高科技产业股份有限公司 | Control circuit for intelligent breaker loop protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| DD01 | Delivery of document by public notice |
Addressee: Disheng Electronimcs Inst., Jinan Person in charge Document name: Notification that Application Deemed not to be Proposed |