CN204349424U - Microcomputer transformer backup protection loop - Google Patents
Microcomputer transformer backup protection loop Download PDFInfo
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- CN204349424U CN204349424U CN201420705043.5U CN201420705043U CN204349424U CN 204349424 U CN204349424 U CN 204349424U CN 201420705043 U CN201420705043 U CN 201420705043U CN 204349424 U CN204349424 U CN 204349424U
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- 230000001681 protective effect Effects 0.000 abstract description 3
- 101100100125 Mus musculus Traip gene Proteins 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
A kind of microcomputer transformer backup protection loop, comprise for input main transformer low-pressure side negative sequence voltage signal and main transformer low-pressure side low voltage signal or door, or the output of door is connected to first and door, first presses locked end with another input of door again for removing main transformer, its special character is: be used for input main transformer low-pressure side voltage at the normally closed contact removing main transformer and press off again the available free main transformer secondary side switches of lock termination and exit signal, lock throwing first and the output of door and move back control switch by pressing off again and be connected to second and door, second is used for inputting main transformer high voltage side current signal with another input of door, second draws trip signal output with the output of door after delayer exports with tripping.The normally closed node access protective device that the utility model directly becomes two side switches by main transformer realizes low-pressure side and presses off automatically exiting of lock function again; operate without the need to operations staff; the backup protection tripping accident in dead band can be stopped, prevent main transformer from damaging and fault spread.
Description
Technical field
The utility model relates to a kind of microcomputer transformer backup protection loop.
Background technology
The overcurrent caused for reflection transformer external short circuit fault and the standby as longitudinal difference protection and protection, transformer should install the backup protection of the alternate or ground short circuit fault of reflection, is namely with the corresponding circuit breaker of time delay tripping.According to transformer capacity and protection sensitivity requirement, the overcurrent protection that transform er backup protection (compound voltage lockout overcurrent protection) should select overcurrent protection, composite voltage (negative sequence voltage and voltage between lines) starts or recombination current protection (current protection of negative-sequence current and single-phase type voltage starting).Overcurrent protection through pressing off lock again can reduce operating current, and sensitivity is higher, obtains general application in main transformer backup protection device.
Compound voltage lockout overcurrent protection is made up of composite voltage element, overcurrent element and time component; as the backup protection of main transformer and neighbouring device short trouble; the access electric current of this protection is main transformer side TA bis-three-phase currents, and access voltage is this side of main transformer or other sides TV bis-three-phase voltages.
Some transform er backup protection is only equipped with high-pressure side backup protection, and generally, access electric current is main transformer high-pressure side TA bis-three-phase currents, and access voltage is main transformer low-pressure side TV bis-three-phase voltages.When step down side voltage reduces, or when negative sequence voltage is greater than setting value and the startup of high-pressure side overcurrent, protection act excises transformer through time delay.
For the device only configuring high-pressure side backup protection, when press off again lock function drop into time, only low-pressure side bus voltage meet press off again lock open condition after, overcurrent protection could export tripping operation.
As shown in Figure 1,66KV transforming plant primary system has main transformer 2, and transformation grade is 66/10KV, 10KV is single-trunk segmental wiring.
This transformer station 66KV main transformer backup protection only configures high backup protection, and access electric current is main transformer 66KV side TA bis-three-phase currents, and access voltage is 10KV bus TV bis-three-phase voltages.Phase overcurrent I segment protect, phase overcurrent II segment protect drop into, and phase overcurrent I section presses off lock input again, phase overcurrent II section presses off lock again and drops into.Press off lock value low pressure again, negative phase-sequence overvoltage drops into.
When #1 main transformer stops transport maintenance, 10KV I section of bus is powered by #2 main transformer by 10KV bus connection switch.After #1 main transformer has overhauled, carry out power transmission and to put into operation operation, in the operating process of recovery #1 main transformer power transmission, between #1 main transformer secondary side CT and switch, there is a protection's dead-zone d1.If there is three phase short circuit fault in this dead band; the backup protection overcurrent protection of #1 main transformer high-pressure side starts, but because now 10KV I section of bus is normally charged, low-pressure side bus voltage is rated value; press off lock again through low-pressure side bus voltage, #1 main transformer backup protection is also failure to actuate.In standing, 66KV circuit does not install any protection, and now, this short trouble cannot excise, and needs the action after time delay of the route protection of higher level transformer station to excise this short trouble.Because excision is generally 3-5 second fault time, and the heat-stable time of general main transformer can not more than 2s, and the backup protection tripping accident in this dead band may cause main transformer to damage, expansion accident scope.
Utility model content
If the utility model will provide a kind of and be applicable to the microcomputer transformer backup protection loop that main transformer backup protection only configures high backup protection, this protective loop can stop the backup protection tripping accident in dead band, prevents main transformer from damaging and fault spread.
This microcomputer transformer backup protection loop, comprise for input main transformer low-pressure side negative sequence voltage signal and main transformer low-pressure side low voltage signal or door, or the output of door is connected to first and door, first presses locked end with another input of door again for removing main transformer, its special character is: be used for input main transformer low-pressure side voltage at the normally closed contact removing main transformer and press off again the available free main transformer secondary side switches of lock termination and exit signal, lock throwing first and the output of door and move back control word by pressing off again and be connected to second and door, second is used for inputting main transformer high voltage side current signal with another input of door, second draws trip signal output with the output of door and and trips and export after delayer.
The beneficial effects of the utility model are: structure is simple; reliable in function; utilize with door and or the combination of door; when main transformer secondary switch is when dividing position; the normally closed contact of main transformer secondary side switches is connected; removing main transformer presses locked end to obtain positive voltage signal again; first opens and low-pressure side is pressed off again lock function exit with door; after backup protection equipment detects that overcurrent starts; start second and door; export trip signal through delayer time delay, simultaneously tripping main transformer high-pressure side and low-side switch, thus realize without pressing off the directly exported tripping operation of lock again.When main transformer secondary switch is in co-bit, normally closed contact disconnects, and drops into and presses off lock function again.The utility model directly realizes low-pressure side by the normally closed contact access protective device of main transformer two side switch and presses off automatically exiting of lock function again; operate without the need to operations staff; the backup protection tripping accident in dead band can be stopped, prevent main transformer from damaging and fault spread.
Accompanying drawing explanation
Fig. 1 is 66KV transforming plant primary system schematic;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 2, this microcomputer transformer backup protection loop, comprise for input main transformer low-pressure side negative sequence voltage signal and main transformer low-pressure side low voltage signal or door, or the output of door is connected to first and door, first presses locked end with another input of door again for removing main transformer, be used for input main transformer low-pressure side voltage at the normally closed contact removing main transformer and press off again the available free main transformer secondary side switches of lock termination and exit signal, lock throwing first and the output of door and move back control switch by pressing off again and be connected to second and door, second is used for inputting main transformer high voltage side current signal with another input of door, second draws trip signal output with the output of door after delayer exports with tripping.
Claims (1)
1. a microcomputer transformer backup protection loop, comprise for input main transformer low-pressure side negative sequence voltage signal and main transformer low-pressure side low voltage signal or door, or the output of door is connected to first and door, first presses locked end with another input of door again for removing main transformer, it is characterized in that: be used for input main transformer low-pressure side voltage at the normally closed contact removing main transformer and press off again the available free main transformer secondary side switches of lock termination and exit signal, lock throwing first and the output of door and move back control switch by pressing off again and be connected to second and door, second is used for inputting main transformer high voltage side current signal with another input of door, second draws trip signal output with the output of door after delayer exports with tripping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420705043.5U CN204349424U (en) | 2014-11-22 | 2014-11-22 | Microcomputer transformer backup protection loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420705043.5U CN204349424U (en) | 2014-11-22 | 2014-11-22 | Microcomputer transformer backup protection loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349424U true CN204349424U (en) | 2015-05-20 |
Family
ID=53232667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420705043.5U Active CN204349424U (en) | 2014-11-22 | 2014-11-22 | Microcomputer transformer backup protection loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349424U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790218A (en) * | 2016-04-25 | 2016-07-20 | 国网江苏省电力公司无锡供电公司 | Main transformer backup protection combined voltage blocking system and method for preventing miss operation |
| CN108281944A (en) * | 2018-03-13 | 2018-07-13 | 中国电建集团北京勘测设计研究院有限公司 | A kind of differential protection suitable for single-trunk segmental wiring connects system and its Trip Logic method |
-
2014
- 2014-11-22 CN CN201420705043.5U patent/CN204349424U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790218A (en) * | 2016-04-25 | 2016-07-20 | 国网江苏省电力公司无锡供电公司 | Main transformer backup protection combined voltage blocking system and method for preventing miss operation |
| CN108281944A (en) * | 2018-03-13 | 2018-07-13 | 中国电建集团北京勘测设计研究院有限公司 | A kind of differential protection suitable for single-trunk segmental wiring connects system and its Trip Logic method |
| CN108281944B (en) * | 2018-03-13 | 2023-11-24 | 中国电建集团北京勘测设计研究院有限公司 | Differential protection connection system suitable for single bus sectionalized wiring and tripping logic method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |