CN202221921U - Transformer station standby power automatic switching system having open-phase protection function - Google Patents
Transformer station standby power automatic switching system having open-phase protection function Download PDFInfo
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- CN202221921U CN202221921U CN201120353247.3U CN201120353247U CN202221921U CN 202221921 U CN202221921 U CN 202221921U CN 201120353247 U CN201120353247 U CN 201120353247U CN 202221921 U CN202221921 U CN 202221921U
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- standby power
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Abstract
The utility model relates to a transformer station standby power automatic switching system having an open-phase protection function. The transformer station standby power automatic switching system includes a central control module; a breaker state sensor connecting with the central control module and used for detecting switching states of a first breaker to a fifth breaker in a transformer station power supply system; a breaker switching driving circuit used for control the first breaker to the fifth breaker in corresponding states when an automatic standby power automatic switching action is taken; and a first voltage mutual inductor group and a second voltage mutual inductor group connecting with the central control module respectively and used for detecting voltages on a bus I and a bus II of a high-voltage side respectively. The central control module is provide with a phase voltage signal detecting terminal used for detecting voltages on a bus I and a bus II of a low-voltage side. When conditions of the system meet requirements of allowing a standby power automatic switching device to switch in, a charging state of the standby power automatic switching device is arranged to be 1. Only when the standby power automatic switching device is fully charged and a system fault appears, a standby power source can be switched in. After the standby power source is switched in, the standby power automatic switching device discharges automatically. The standby power automatic switching device continues to charge until the fault is cleared and the conditions of the system meet requirements of allowing a standby power automatic switching device to switch in again.
Description
Technical field
The utility model relates to the technical field of prepared auto restart system of transformer station, specifically be the power supply of a kind of two-way inlet wire, electric power system is the prepared auto restart system of transformer station of small current neutral grounding system, and the action logic of this inlet wire prepared auto restart.
Background technology
Belong to internal bridge for transformer station, and adopt the supply power mode of two main transformers of a 35kV inlet wire band, as shown in Figure 1.The primary connection of this transformer station comprises: two 35kV inlet wires (being inlet wire 1, inlet wire 2); Inlet wire 1 is connected on the on high-tension side I bus input with the 1# main transformer through the first circuit breaker 1DL, and the output of 1# main transformer is connected on the I bus of low-pressure side through the 4th circuit breaker 4DL; Inlet wire 2 is connected on the on high-tension side II bus input with the 2# main transformer through the second circuit breaker 2DL, and the output of 2# main transformer is connected on the II bus of low-pressure side through the 5th circuit breaker 5DL.Be connected with the 3rd circuit breaker 3DL between on high-tension side I, the II bus.
35kV inlet wire circuit adopts overhead wire to set up, and during operate as normal, said 1DL, 3DL, 4DL and 5DL are "on" position, and 2DL is tripped condition; When the broken string ground fault takes place in C phase circuit, adopt the backup auto-activating device in the existing 110KV electric power system can not move, the circuit breaker of inlet wire 1 both sides still closes the position operation.Surveillance center finds that the busbar voltage of this transformer station is unusual after 1 hour, and Surveillance center manually controls circuit breaker 1DL and breaks off, and circuit breaker 2DL is dropped into, and transformer station's service restoration is normal.
Accident analysis: for small current neutral grounding system, when the single-phase wire break ground fault took place, the line voltage of supply side still kept symmetry.According to relevant rules, allow to continue power supply 2～3 hours.This transformer station is in and receives electric side, is that D/YN11 is an example with the connection group of transformer, and three-phase institute on-load is symmetry basically.When on high-tension side C phase circuit took place by broken string ground connection, this electric power system equivalence was Fig. 3.Its polar plot is as shown in Figure 4.
Adopt voltage transformer pt to detect on high-tension side each line voltage, can know that by Fig. 4 the line voltage of converting the secondary side of voltage transformer pt has: UAC=UBC=50V, UAB=100V.
Directly detect each phase voltage of low-pressure side, each phase voltage is respectively: Ua=231V, Ub=115V, Uc=115V.
Like Fig. 2, the logic of the prepared auto restart equipment that existing 110KV electric power system adopts, when the voltage of the high and low pressure side that adopts main transformer carried out logic determines, the prepared auto restart action need be under the situation that relevant control word allows, and four side voltage components all are judged to decompression, that is:
1), the decompression of high-pressure side I bus: U
AB1＜no compression set value, U
BC1＜no compression set value, U
CA1＜no compression set value;
2), the voltage of high-pressure side II bus: U
AB2＜no compression set value, U
BC2＜no compression set value, U
CA2＜no compression set value;
3), the decompression of low-pressure side I bus: UL
1＜no compression set value;
4), the voltage of low-pressure side II bus: UL
2＜no compression set value;
And under the situation that the 1# main transformer does not break down, said backup auto-activating device just can move.
In the existing backup auto-activating device; The voltage definite value of high-voltage side bus decompression is that 30V (that is: detects the voltage of high-pressure side I, II bus through voltage transformer pt; If the line voltage＜30V of voltage transformer pt secondary side (being the output of voltage transformer pt) then is judged as the high-voltage side bus decompression).Because the line voltage of the secondary side of PT has: UAC=UBC=50V, UAB=100V, so high-voltage side bus decompression element can not move, backup auto-activating device just can not move yet.
Therefore, how when the broken string ground fault takes place circuit, realizing the prepared auto restart system of transformer station that backup auto-activating device moves through a kind of, is the technical problem that this area will solve.
The utility model content
The technical problem that the utility model will solve provides a kind of simple in structure, prepared auto restart system of transformer station with open-phase protection function that automaticity is higher.
In order to solve the problems of the technologies described above, the utility model provides a kind of prepared auto restart system of transformer station with open-phase protection function, and it comprises: central control unit; The circuit-breaker status transducer links to each other with central control unit, is used for detecting the breaker tripping and closing state of the first, second, third, fourth and the 5th circuit breaker of transformer station's electric power system; Circuit breaker breaker tripping and closing drive circuit links to each other with central control unit, is used for when implementing the backup auto-activating device action, controlling the said first, second, third, fourth and the 5th circuit breaker and being in corresponding state; First, second voltage transformer group links to each other with central control unit respectively, is used for detecting respectively each the line voltage on high-pressure side I, the II bus; Said central control unit has the phase voltage signal test side that is used to detect each phase voltage on low-pressure side I, the II bus.
The method of work of this prepared auto restart system of transformer station comprises: central control unit records said the first, the 3rd, the 4th and the 5th circuit breaker through said circuit-breaker status transducer and is in "on" position; And second circuit breaker is in tripped condition, judges that then " inlet wire is hauled oneself willingly into mode 1 charging " state of the prepared auto restart system of transformer station of this moment is 1; If one of each line voltage U AB1, UAC1 and UBC1 on the I bus of high-pressure side are less than the first no compression set value; One of each line voltage U AB2, UAC2 and UBC2 on the II bus of high-pressure side is less than the first no compression set value; One of each phase voltage Ua1, Ub1 and Uc1 on the low-pressure side I bus is less than the second no compression set value; One of each phase voltage Ua2, Ub2 and Uc2 on the low-pressure side II bus is less than the second no compression set value, and " no BZT locking ", and after state continuance one preset time t of above-mentioned each Rule of judgment; Central control unit is controlled said first via device tripping operation through said circuit breaker breaker tripping and closing drive circuit; Behind the time-delay 500ms, if recording said first via device through said circuit-breaker status transducer is tripped condition, then central control unit is controlled said No. the second device combined floodgate through said circuit breaker breaker tripping and closing drive circuit.
The technique scheme of the utility model is compared prior art and is had the following advantages: the prepared auto restart system of transformer station of (1) the utility model in use, automatic bus can move when four side voltages all are judged to decompression.Inlet wire prepared auto restart logic such as Fig. 6; When this fault case takes place, the definite value of high-voltage side bus decompression element is brought up to greater than 50V, less than 100V,, then haul oneself willingly into and be contained in high-pressure side decompression element ability correct operation under this fault case like 60V.And under the normal operating condition, high-voltage side bus pressure-wire voltage two sub-values reach 100V, and the bus loss of pressure element can malfunction.Be provided with greater than 115V less than 230V for the secondary voltage definite value of two sections buses of low-pressure side,, then haul oneself willingly into and be contained in that low-pressure side decompression element just can correct operation under this fault case like 150V.(2) in the utility model, when system's terms and conditions satisfies prepared auto restart and allow to drop into, make that the prepared auto restart charged state is 1.Have only chargedly, stand-by power supply could drop into when the system failure, and after the stand-by power supply input, prepared auto restart discharges automatically, eliminates up to fault, satisfies to haul oneself willingly into condition next time and just can continue charging.So just reach prepared auto restart and can only move purpose once.
Description of drawings
For the content that makes the utility model is more clearly understood, below basis specific embodiment and combine accompanying drawing, the utility model is done further detailed explanation, wherein
Fig. 1 be among the embodiment two main transformers of 35kV inlet wire band, by the transforming plant primary wiring of inlet wire prepared auto restart control;
Fig. 2 is the action logic figure of the inlet wire backup auto-activating device that the 110KV electric power system adopts in the prior art;
When Fig. 3 is the high-pressure side C phase circuit generation broken string ground connection in the transforming plant primary wiring among Fig. 1, the isoboles of this electric power system;
When Fig. 4 is the high-pressure side C phase dead electricity in the transforming plant primary wiring among Fig. 1, the vectogram of this electric power system;
Fig. 5 is the circuit structure block diagram based on the prepared auto restart system of transformer station among Fig. 1;
Fig. 6 is the action logic figure of the inlet wire prepared auto restart among the embodiment.
Embodiment
See Fig. 1,5-6, the prepared auto restart system of transformer station with open-phase protection function of present embodiment, it comprises: central control unit; The circuit-breaker status transducer links to each other with central control unit, is used for detecting the breaker tripping and closing state of the first, second, third, fourth and the 5th circuit breaker of transformer station's electric power system; Circuit breaker breaker tripping and closing drive circuit links to each other with central control unit, is used for when implementing the backup auto-activating device action, controlling the said first, second, third, fourth and the 5th circuit breaker and being in corresponding state; First, second voltage transformer group links to each other with central control unit respectively, is used for detecting respectively each the line voltage on high-pressure side I, the II bus; Said central control unit has the phase voltage signal test side that is used to detect each phase voltage on low-pressure side I, the II bus.
The method of work of prepared auto restart system of said transformer station comprises: said central control unit records said the first, the 3rd, the 4th and the 5th circuit breaker through said circuit-breaker status transducer and is in "on" position; And second circuit breaker is in tripped condition, judges that then " inlet wire is hauled oneself willingly into mode 1 charging " state of the prepared auto restart system of transformer station of this moment is 1; If one of each line voltage U AB1, UAC1 and UBC1 on the I bus of high-pressure side are less than the first no compression set value; One of each line voltage U AB2, UAC2 and UBC2 on the II bus of high-pressure side is less than the first no compression set value; One of each phase voltage Ua1, Ub1 and Uc1 on the low-pressure side I bus is less than the second no compression set value; One of each phase voltage Ua2, Ub2 and Uc2 on the low-pressure side II bus is less than the second no compression set value, and " no BZT locking ", and after state continuance one preset time t of above-mentioned each Rule of judgment; Central control unit is controlled said first via device tripping operation through said circuit breaker breaker tripping and closing drive circuit; Behind the time-delay 500ms, if recording said first via device through said circuit-breaker status transducer is tripped condition, then central control unit is controlled said No. the second device combined floodgate through said circuit breaker breaker tripping and closing drive circuit.
The value of the above-mentioned first no compression set value is between 50V and the 100V, preferred 60V; The value of the second no compression set value is between 115V and the 230V, preferred 150V.
The value of above-mentioned preset time t is between the 1-5S, preferred 2S.
" BZT locking " is meant: when the fault (for example: 1# main transformer break down etc.) of locking prepared auto restart system needing to appear in system, the prepared auto restart system realized locking, and promptly this prepared auto restart system is failure to actuate all the time.The fault of locking prepared auto restart system needing not to appear in said " the no BZT locking " system of being meant.
Obviously, the foregoing description only be for explain clearly that the utility model does for example, and be not to be qualification to the execution mode of the utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all execution modes.And conspicuous variation that these spirit that belong to the utility model are extended out or change still are among the protection range of the utility model.
Claims (1)
1. prepared auto restart system of transformer station with open-phase protection function is characterized in that comprising:
Central control unit;
The circuit-breaker status transducer links to each other with central control unit, is used for detecting the breaker tripping and closing state of the first, second, third, fourth and the 5th circuit breaker of transformer station's electric power system;
Circuit breaker breaker tripping and closing drive circuit links to each other with central control unit, is used for when implementing the backup auto-activating device action, controlling the said first, second, third, fourth and the 5th circuit breaker and being in corresponding state;
First, second voltage transformer group links to each other with central control unit respectively, is used for detecting respectively each the line voltage on high-pressure side I, the II bus;
Said central control unit has the phase voltage signal test side that is used to detect each phase voltage on low-pressure side I, the II bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120353247.3U CN202221921U (en) | 2011-09-20 | 2011-09-20 | Transformer station standby power automatic switching system having open-phase protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120353247.3U CN202221921U (en) | 2011-09-20 | 2011-09-20 | Transformer station standby power automatic switching system having open-phase protection function |
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| CN202221921U true CN202221921U (en) | 2012-05-16 |
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|---|---|---|---|
| CN201120353247.3U Expired - Lifetime CN202221921U (en) | 2011-09-20 | 2011-09-20 | Transformer station standby power automatic switching system having open-phase protection function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340171A (en) * | 2011-09-20 | 2012-02-01 | 江苏省电力公司常州供电公司 | Transformer substation spare power automatic switching system with default-phase protection function and working method thereof |
| CN106684839A (en) * | 2016-12-31 | 2017-05-17 | 国网冀北电力有限公司技能培训中心 | Boundary switch protection system based on combination of PLC and fault indicator |
| CN109324286A (en) * | 2018-09-29 | 2019-02-12 | 国家电网有限公司 | Intelligent multifunction switching device for mechanical characteristic of high-voltage circuit breaker test |
| CN111579927A (en) * | 2020-05-22 | 2020-08-25 | 南京南瑞继保电气有限公司 | Disconnection protection judgment method and device suitable for single-side power transmission line |
| CN113783284A (en) * | 2021-07-26 | 2021-12-10 | 国网江苏省电力有限公司淮安供电分公司 | Cross-voltage-class self-adaptive locking spare power automatic switching implementation method |
-
2011
- 2011-09-20 CN CN201120353247.3U patent/CN202221921U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340171A (en) * | 2011-09-20 | 2012-02-01 | 江苏省电力公司常州供电公司 | Transformer substation spare power automatic switching system with default-phase protection function and working method thereof |
| CN106684839A (en) * | 2016-12-31 | 2017-05-17 | 国网冀北电力有限公司技能培训中心 | Boundary switch protection system based on combination of PLC and fault indicator |
| CN106684839B (en) * | 2016-12-31 | 2019-03-15 | 国网冀北电力有限公司技能培训中心 | A kind of demarcation switch protection system combined based on PLC and fault detector |
| CN109324286A (en) * | 2018-09-29 | 2019-02-12 | 国家电网有限公司 | Intelligent multifunction switching device for mechanical characteristic of high-voltage circuit breaker test |
| CN111579927A (en) * | 2020-05-22 | 2020-08-25 | 南京南瑞继保电气有限公司 | Disconnection protection judgment method and device suitable for single-side power transmission line |
| CN113783284A (en) * | 2021-07-26 | 2021-12-10 | 国网江苏省电力有限公司淮安供电分公司 | Cross-voltage-class self-adaptive locking spare power automatic switching implementation method |
| CN113783284B (en) * | 2021-07-26 | 2023-09-29 | 国网江苏省电力有限公司淮安供电分公司 | Cross-voltage-class self-adaptive blocking standby power automatic switching implementation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20120918 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 213000 CHANGZHOU, JIANGSU PROVINCE TO: 213003 CHANGZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120918 Address after: 213003 Jiangsu province Changzhou City Tianning District Bureau Street No. 27 Patentee after: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee before: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120516 Effective date of abandoning: 20140319 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20120516 Effective date of abandoning: 20140319 |