CN204559113U - Power distribution network multistage loop grid vertical connection phase segregated differential protection device - Google Patents
Power distribution network multistage loop grid vertical connection phase segregated differential protection device Download PDFInfo
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- CN204559113U CN204559113U CN201520276877.3U CN201520276877U CN204559113U CN 204559113 U CN204559113 U CN 204559113U CN 201520276877 U CN201520276877 U CN 201520276877U CN 204559113 U CN204559113 U CN 204559113U
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- 238000004891 communication Methods 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 3
- 230000004308 accommodation Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
Abstract
The utility model relates to a kind of power distribution network multistage loop grid vertical connection phase segregated differential protection device, and it, being provided with the mains side configuration side differential protection circuit of circuit breaker, is being provided with contact device in the middle of the configuration of on-load switch place; Side differential protection circuit comprises the first differential protection circuit and the second differential protection circuit; First differential protection circuit gathers the first differential protection information of place mains side, second differential protection circuit gathers the second differential protection information of place mains side, middle contact device can gather the intermediate differential protection information of position, described intermediate differential protection information can transfer in the first differential protection circuit and the second differential protection circuit by middle contact device respectively, and the second differential protection information in the first differential protection information of the first differential protection circuit and the second differential protection circuit exchanges by middle contact device; The utility model compact conformation, effectively can solve the protection under multi-section-line road, wide accommodation, safe and reliable.
Description
Technical field
The utility model relates to a kind of phase segregated differential protection device, and especially a kind of power distribution network multistage loop grid vertical connection phase segregated differential protection device, belongs to the technical field of relay protection of power system.
Background technology
At present, for solving absolutely selective problem during distribution network line fault, need to use optical fiber differential protective.Existing differential protection is arranged on circuit both sides, when detecting that line-internal has fault, and tripping circuit both sides circuit breaker.In power distribution network, there is on-load switch in a large number, only can manual operation deciliter load current, can not configuration protection.If need to apply differential protection, needing on-load switch to be replaced with circuit breaker could apply.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art, and provide a kind of power distribution network multistage loop grid vertical connection phase segregated differential protection device, its compact conformation, effectively can solve the protection under multi-section-line road, wide accommodation, safe and reliable.
According to the technical scheme that the utility model provides, described power distribution network multistage loop grid vertical connection phase segregated differential protection device, being provided with the mains side configuration side differential protection circuit of circuit breaker, is being provided with contact device in the middle of the configuration of on-load switch place; Side differential protection circuit comprises the first differential protection circuit for controlling the first circuit breaker switch state and the second differential protection circuit for controlling the second circuit breaker switch state, described first differential protection circuit, the second differential protection circuit are positioned at the both sides of middle contact device, with and the first differential protection circuit, the second differential protection circuit by optical fiber and middle contact device connecting communication;
First differential protection circuit gathers the first differential protection information of place mains side, second differential protection circuit gathers the second differential protection information of place mains side, middle contact device can gather the intermediate differential protection information of position, described intermediate differential protection information can transfer in the first differential protection circuit and the second differential protection circuit by middle contact device respectively, and the second differential protection information in the first differential protection information of the first differential protection circuit and the second differential protection circuit exchanges by middle contact device;
First differential protection circuit can control the on off state of the first circuit breaker according to the first differential protection information, intermediate differential protection information and the second differential protection information, the second differential protection circuit can control the on off state of the second circuit breaker according to the first differential protection information, intermediate differential protection information and the second differential protection information.
Described middle contact device comprises contact processor and contact device low pass filter, contact device low pass filter can carry out filtering to the line current collecting busbar voltage and on-load switch place circuit, contact device low pass filter is connected by the input of contact device A/D convertor circuit with contact processor, and contact device processor is also connected with two-way optical communication interface.
Described first differential protection circuit comprises conservation treatment device and protection low pass filter; described protection low pass filter can carry out filter to the line current of the busbar voltage collected and circuit breaker place circuit; protection low pass filter is connected with the input of conservation treatment device by protection A/D convertor circuit, and conservation treatment device is also connected with optical communication interface.
Advantage of the present utility model: be provided with the mains side configuration side differential protection circuit of circuit breaker, contact device in the middle of the configuration of on-load switch place is being installed, described side differential protection circuit is positioned at the both sides of middle contact device, and side differential protection circuit is by optical fiber and middle contact device connecting communication; Compact conformation, effectively can solve the protection under multi-section-line road, wide accommodation, safe and reliable.
Accompanying drawing explanation
Fig. 1 is the concrete implementing circuit schematic diagram of one of the present utility model.
Fig. 2 is the structured flowchart of the utility model side differential protection circuit.
Fig. 3 is the structured flowchart of contact device in the middle of the utility model.
Description of reference numerals: 1-first differential protection circuit, contact device in the middle of 2-, 3-second differential protector, 4-first circuit breaker, 5-second circuit breaker, 6-first voltage transformer, 7-second voltage transformer, 8-tertiary voltage instrument transformer, 9-first current sensor, 10-second current sensor, 11-the 3rd current sensor, 12-the 4th current sensor, 13-first on-load switch, 14-second on-load switch, 15-protects low pass filter, 16-protects A/D convertor circuit, 17-conservation treatment device, 18-optical communication interface, 19-first optical coupling isolation circuit, 20-contact device low pass filter, 21-contact device A/D convertor circuit, 22-gets in touch with processor, 23-second optical coupling isolation circuit and 24-two-way optical communication interface.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, in order to effectively solve the protection under multi-section-line road, the utility model, being provided with the mains side configuration side differential protection circuit of circuit breaker, is being provided with contact device 2 in the middle of the configuration of on-load switch place; Side differential protection circuit comprises the first differential protection circuit 1 for controlling the first circuit breaker 4 on off state and the second differential protection circuit 3 for controlling the second circuit breaker 5 on off state, described first differential protection circuit 1, second differential protection circuit 3 is positioned at the both sides of middle contact device 2, with and the first differential protection circuit 1, second differential protection circuit 3 by optical fiber and middle contact device 2 connecting communication;
First differential protection circuit 1 gathers the first differential protection information of place mains side, second differential protection circuit 3 gathers the second differential protection information of place mains side, middle contact device 2 can gather the intermediate differential protection information of position, described intermediate differential protection information can transfer in the first differential protection circuit 1 and the second differential protection circuit 3 by middle contact device 2 respectively, and the second differential protection information in the first differential protection information of the first differential protection circuit 1 and the second differential protection circuit 3 exchanges by middle contact device 2;
First differential protection circuit 1 can control the on off state of the first circuit breaker 4 according to the first differential protection information, intermediate differential protection information and the second differential protection information, the second differential protection circuit 3 can control the on off state of the second circuit breaker 5 according to the first differential protection information, intermediate differential protection information and the second differential protection information.
Particularly, the first circuit breaker 4 is set in a transformer station, the second circuit breaker 5 is set in another transformer station, between two transformer stations, there is switching station.The circuit at the first circuit breaker 4 place arranges the first current sensor 9, the line current I1 of the first circuit breaker 4 place circuit can be obtained by the first current sensor 9.Meanwhile, busbar voltage PT1 is gathered by the first voltage transformer 6.First differential protection circuit 1 receiving lines circuit I 1 and busbar voltage PT1, the output of the first differential protection circuit 1 is connected with the coil of the first circuit breaker 4, can control the on off state of the first circuit breaker 4.
One end that described on-load switch comprises the first on-load switch 13 and the second on-load switch 14, first on-load switch 13 is connected with the first circuit breaker 4, and one end of the second on-load switch 14 is connected with the second circuit breaker 5.The circuit at the first on-load switch 13 place arranges the second current sensor 10, to be obtained the line current I2 of the first on-load switch 13 place circuit by the second current sensor 10.The circuit at the second on-load switch 14 place arranges the 3rd current sensor 11, to be obtained the line current I3 of the second on-load switch 14 place circuit by the 3rd current sensor 11.Gathered the busbar voltage PT2 of switching station by the second voltage transformer 7, middle contact device 2 is receiving lines electric current I 2, line circuit I3 and busbar voltage PT2 simultaneously.Under normal circumstances, line current I2 is identical with line current I1.Middle contact device 2 is connected with the first on-load switch 13 and the second on-load switch 14, can control the on off state of the first on-load switch 13 and the second on-load switch 14.
At the circuit at the second circuit breaker 5 place, the 4th current sensor 12 is set; to be obtained the line current I4 of the second circuit breaker 5 place circuit by the 4th current sensor 12; the busbar voltage PT3 of transformer station is gathered by tertiary voltage instrument transformer 8; second differential protection circuit 3 is receiving lines electric current I 4 and busbar voltage PT3 simultaneously; and the output of the second differential protection circuit 3 is connected with the coil of the second circuit breaker 5, so that the on off state of the second circuit breaker 5 can be controlled.
During work, the first differential protection circuit 1, middle contact device 2 coordinate with the second differential protection circuit 3, control the state of the first circuit breaker 4, second circuit breaker 5, first on-load switch 13 and the second on-load switch 14, to realize the protection to circuit.Particularly:
The decision logic broken down between first circuit breaker 4 and the first on-load switch 13: the cumulative sum that the accumulated value of line current I1 and line current I2 is greater than the first setting threshold, line current I1 and line current I4 is greater than the second setting threshold, then disconnect the first circuit breaker 4 by the first differential protection circuit 1 and disconnect the second circuit breaker 5 by the second differential protection circuit 3.When the first on-load switch 13 of switching station has been replaced by circuit breaker, tripping first circuit breaker 4 and the first on-load switch 13 are needed.The size of the first setting threshold, the second setting threshold is determined according to the operating state of circuit, and concrete assignment procedure, known by the art personnel, repeats no more herein.
The decision logic broken down between second circuit breaker 5 and the second on-load switch 14: the accumulated value that the cumulative sum of line current I3 and line current I4 is greater than the 3rd setting threshold, line current I1 and line current I4 is greater than the 4th setting threshold; then disconnect the first circuit breaker by the first differential protection circuit 1, disconnect the second circuit breaker 5 by the second differential protection circuit 3.When the second on-load switch 14 of switching station has been replaced by circuit breaker, tripping first circuit breaker 4 and the second on-load switch 14 are needed.The size of the 3rd setting threshold, the 4th setting threshold is determined according to the operating state of circuit, and concrete assignment procedure, known by the art personnel, repeats no more herein.
The Rule of judgment broken down in switching station: when the accumulated value that the accumulated value that the accumulated value of line current I1 and line current I2 is less than the 5th setting threshold, line current I3 and line current I4 is less than the 6th setting threshold, line current I2 and line current I3 is greater than the 7th setting threshold; then disconnect the first circuit breaker 4 by the first differential protection circuit 1, disconnect the second circuit breaker 5 by the second differential protection circuit 3.When the first on-load switch 13 of switching station and the second on-load switch 14 have been replaced by circuit breaker; pilot wire relays is the first circuit breaker 4 and the second circuit breaker 5 no longer, and implemented to disconnect protection by the first on-load switch 13 in switching station and the second on-load switch 14.The size of the 5th setting threshold, the 6th setting threshold and the 7th setting threshold is determined according to the operating state of circuit, and concrete assignment procedure, known by the art personnel, repeats no more herein.
As shown in Figure 3, described middle contact device 2 comprises contact processor 22 and contact device low pass filter 20, contact device low pass filter 20 can carry out filtering to the line current collecting busbar voltage and on-load switch place circuit, contact device low pass filter 20 is connected by the input of contact device A/D convertor circuit 21 with contact processor 22, and contact device processor 22 is also connected with two-way optical communication interface 24.
In the utility model embodiment; contact processor 22 can adopt conventional microprocessor; contact device low pass filter 20 and contact device A/D convertor circuit 21 all can adopt conventional circuit structure; data after contact device low pass filter 20 and contact device A/D convertor circuit 21 process can identify by contact processor 22, contact processor 22 can carry out optical-fibre communications with the side differential protection circuit of both sides by two-way optical communication interface 24 and optical fiber.Contact processor 22 also carrys out receiving key amount by the second optical coupling isolation circuit 23.
As shown in Figure 2; described first differential protection circuit 1 comprises conservation treatment device 17 and protection low pass filter 15; described protection low pass filter 15 can carry out filter to the line current of the busbar voltage collected and circuit breaker place circuit; protection low pass filter 15 is connected with the input of conservation treatment device 17 by protection A/D convertor circuit 15, and conservation treatment device 17 is also connected with optical communication interface 18.
In the utility model embodiment; first differential protection circuit 1 adopts identical structure with the second differential protection circuit 3; conservation treatment device 17 can adopt conventional microprocessor; conservation treatment device 17 can carry out optical-fibre communications with middle contact device 2 by optical communication interface 18 and optical fiber, and conservation treatment device 17 connects receiving key amount by the first optical coupling isolation circuit 19.
The utility model is being provided with the mains side configuration side differential protection circuit of circuit breaker, contact device 2 in the middle of the configuration of on-load switch place is being installed, described side differential protection circuit is positioned at the both sides of middle contact device 2, and side differential protection circuit is by optical fiber and middle contact device 2 connecting communication; Compact conformation, effectively can solve the protection under multi-section-line road, wide accommodation, safe and reliable.
Claims (3)
1. a power distribution network multistage loop grid vertical connection phase segregated differential protection device, is characterized in that: being provided with the mains side configuration side differential protection circuit of circuit breaker, be provided with contact device (2) in the middle of the configuration of on-load switch place; Side differential protection circuit comprises the first differential protection circuit (1) for controlling the first circuit breaker (4) on off state and the second differential protection circuit (3) for controlling the second circuit breaker (5) on off state; described first differential protection circuit (1), the second differential protection circuit (3) are positioned at the both sides of middle contact device (2), with and the first differential protection circuit (1), the second differential protection circuit (3) by optical fiber and middle contact device (2) connecting communication.
2. power distribution network multistage loop grid according to claim 1 vertical connection phase segregated differential protection device; it is characterized in that: described middle contact device (2) comprises contact processor (22) and contact device low pass filter (20); contact device low pass filter (20) can carry out filtering to the line current collecting busbar voltage and on-load switch place circuit; contact device low pass filter (20) is connected by the input of contact device A/D convertor circuit (21) with contact processor (22), and contact device processor (22) is also connected with two-way optical communication interface (24).
3. power distribution network multistage loop grid according to claim 1 vertical connection phase segregated differential protection device; it is characterized in that: described first differential protection circuit (1) comprises conservation treatment device (17) and protection low pass filter (15); described protection low pass filter (15) can carry out filter to the line current of the busbar voltage collected and circuit breaker place circuit; protection low pass filter (15) is connected with the input of conservation treatment device (17) by protection A/D convertor circuit (15), and conservation treatment device (17) is also connected with optical communication interface (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520276877.3U CN204559113U (en) | 2015-04-30 | 2015-04-30 | Power distribution network multistage loop grid vertical connection phase segregated differential protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520276877.3U CN204559113U (en) | 2015-04-30 | 2015-04-30 | Power distribution network multistage loop grid vertical connection phase segregated differential protection device |
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| CN204559113U true CN204559113U (en) | 2015-08-12 |
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| CN201520276877.3U Active CN204559113U (en) | 2015-04-30 | 2015-04-30 | Power distribution network multistage loop grid vertical connection phase segregated differential protection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602525A (en) * | 2016-11-17 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | Differential protection system and method for power distribution network |
| CN107809106A (en) * | 2017-11-03 | 2018-03-16 | 济南历源实业有限责任公司 | A kind of distribution protection observing and controlling voltage x current data synchronization processing device and method |
| CN107819321A (en) * | 2017-11-03 | 2018-03-20 | 济南历源实业有限责任公司 | A kind of power distribution network distribution differential protecting method of on-load switch |
-
2015
- 2015-04-30 CN CN201520276877.3U patent/CN204559113U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602525A (en) * | 2016-11-17 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | Differential protection system and method for power distribution network |
| CN106602525B (en) * | 2016-11-17 | 2018-12-07 | 云南电网有限责任公司电力科学研究院 | Power distribution network differential protective system and method |
| CN107809106A (en) * | 2017-11-03 | 2018-03-16 | 济南历源实业有限责任公司 | A kind of distribution protection observing and controlling voltage x current data synchronization processing device and method |
| CN107819321A (en) * | 2017-11-03 | 2018-03-20 | 济南历源实业有限责任公司 | A kind of power distribution network distribution differential protecting method of on-load switch |
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| GR01 | Patent grant |