CN106655122A - Multilevel differential protection system and method of power distribution overhead-cable mixed lines - Google Patents
Multilevel differential protection system and method of power distribution overhead-cable mixed lines Download PDFInfo
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- CN106655122A CN106655122A CN201611147567.7A CN201611147567A CN106655122A CN 106655122 A CN106655122 A CN 106655122A CN 201611147567 A CN201611147567 A CN 201611147567A CN 106655122 A CN106655122 A CN 106655122A
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- switch
- branch
- permanent
- line
- electrode difference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a permanent magnet switch-based multilevel differential protection system and method of power distribution overhead-cable mixed lines. According to the method, multiple electromagnetic switches are arranged on a main line, branch lines and load branch circuits to form multiple protection levels; and when one branch circuit is in a fault, only the electromagnetic switch corresponding to a branch on which the branch circuit is located acts to form multilevel differential protection through adjusting the action breaking time of various electromagnetic switches. According to the permanent magnet switch-based multilevel differential protection configuration strategy, the short interruption times caused by a transient fault in a power distribution network can be effectively reduced; the fault of a user can be kept indoors; the condition of a power failure of the whole line caused by the fault of a user side is prevented; and the power supply reliability of the power distribution network is improved.
Description
Technical field
The present invention relates to a kind of built on stilts multistage electrode difference protection system of cable hybrid line of distribution based on permanent-magnetic switching and side
Method.
Background technology
Power distribution network is the end link for ensureing customer power supply reliability, and transient fault is in the great majority in power distribution network, is to affect
The principal element of the quality of power supply and power supply reliability.At present, in China's power distribution network, especially Shandong power distribution network, typical to adopt
User demarcation load switch or breaker carry out user-isolated failure, and these switch operation mechanisms are similar with circuit wire-outgoing breaker,
Equally adopt pull operation mechanism.When user side breaks down, even if employing demarcation circuit breaker, also can move because switching instantaneous quick-break
Making the time is generally slower than transformer station's wire-outgoing breaker actuation time, and cannot form Graded coordination, therefore user's branch line failure
Frequently result in whole piece line outage.
In recent years, existing a small amount of pilot application at home is started using the breaker of permanent-magnet manipulating mechanism.Permanent-magnetic switching with
Quick action, after especially user side is mounted with, user malfunction guarantees to stay indoor, and has both reduced line outage, reduces again
Other users have a power failure, and and protect circuit other operation equipment.But, permanent-magnetic switching technology is used as a kind of novel switched skill
Art, in Shandong, the application of power distribution network is at present still in space state.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of built on stilts cable hybrid line of distribution based on permanent-magnetic switching is more
Level electrode difference protection system and method, this method is used for the relay of 20kV and the built on stilts cable hybrid line of following electric pressure power distribution network
In relaying configuration.This method is, based on the multistage electrode difference protection configuration strategy of permanent-magnetic switching, can effectively to reduce wink in power distribution network
When failure caused by transient-power failure number of times, it is also possible to guarantee that user malfunction is stayed indoor, prevent user side failure from causing completely to have a power failure
The occurrence of, improve the power supply reliability of power distribution network.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of distribution based on permanent-magnetic switching multistage electrode difference protection system of built on stilts cable hybrid line, including multiple levels
Controlling switch, by the action opening time for arranging different controlling switches, when making certain line fault, branch only residing for the circuit
Corresponding level controlling switch action, form multistage electrode difference protection.
The controlling switch is electromagnetic switch, is the vacuum circuit breaker using permanent-magnet manipulating mechanism and contactless actuation techniques
Device.
Specifically, including built on stilts part and cable section protective loop, the protective loop of the built on stilts part include with
The on-load switch of transformer station's outlet switch connection, the on-load switch controls the break-make of some branch roads, by feedback on each branch road
If line branch switch controls main line user's branch road, user's branch road is demarcated using different user demarcation switches；
The protective loop of the cable section includes the block switch being segmented to ring main unit branch road and and block switch
Multiple ring main unit outlet switchs of connection；
By arranging transformer station's outlet switch, feeder branch switch, user demarcation switch, block switch and ring main unit
The action opening time of outlet switch, forms multistage electrode difference protection.
Transformer station's outlet switch is to be arranged in transformer station the switch with the junction of backbone.
User demarcation switch is arranged at distribution line T interfaces, can effective user-isolated boundary's internal fault region, with
The normal operation of protection non-fault line.
The ring main unit outlet switch is the switch for being arranged at backbone or branch line and the junction of ring main unit.
The feeder branch switch is the switch for being arranged at backbone and the junction of branch line.
The feeder line section switch are for the switch of segmentation in backbone.
A kind of distribution based on permanent-magnetic switching multistage electrode difference protection method of built on stilts cable hybrid line, is opened using multiple electromagnetism
Close, be positioned on backbone, branch line and load branch circuit, form multiple protection levels, by adjusting each electromagnetic switch
Action opening time, when making certain branch trouble, the corresponding electromagnetic switch action of branch only residing for the branch road is formed multistage differential
Protection.
The protection act delay adjustmentses of electromagnetic switch are 100～150ms.
Beneficial effects of the present invention are：
The present invention is based on permanent-magnetic switching, the distribution multistage electrode difference protection of built on stilts cable hybrid line is formed, using novel permanent magnetic
Switchgear and multistage electrode difference protection configuring technical realize in reduction power distribution network transient-power failure number of times caused by transient fault
Target, can effectively prevent user side failure from causing the generation of all fronts power-off condition, improve the power supply reliability of power distribution network.Together
When, the multistage electrode difference protection collocation method is specifically designed for the built on stilts cable hybrid line of distribution, it is adaptable to which urban aerial cable mixes
The distribution line of structure.
Description of the drawings
Fig. 1 is the built on stilts cable hybrid line structural representation of the distribution based on permanent-magnetic switching of the present invention.
Specific embodiment：
Below in conjunction with the accompanying drawings the invention will be further described with embodiment.
Fig. 1 is the built on stilts cable hybrid line structural representation of the distribution based on permanent-magnetic switching of the present invention, as depicted
The built on stilts cable hybrid line structure of distribution based on permanent-magnetic switching, including overhead transmission line, cable run, block switch, feeder line point
Zhi Kaiguan, user demarcation switch and ring main unit etc..
Shown in Fig. 1, user demarcation switch B1～B4It is permanent-magnetic switching, protection act delay adjustmentses are 0s；Ring main unit outlet is opened
Close B5～B16It is permanent-magnetic switching, protection act time delay is also set to 0s；Feeder branch switchs A4、A5It is permanent-magnetic switching, protection act
Delay adjustmentses are 100～150ms；Block switch A3、A8It is permanent-magnetic switching, protection act time delay is also set to 100～150ms；Become
Power station 10kV outlet switch S1Protection act delay adjustmentses are 250～300ms.A1、A2、A6Deng for on-load switch.Matched somebody with somebody using this
When putting strategy, user and branched line failure and ring main unit outlet switch and using the looped network cabinet wire switch of permanent-magnetic switching after
The line fault in face will not cause whole piece line tripping.
The collocation method also includes：On the premise of higher level's protection cooperation is not affected, moved by adjusting permanent-magnetic switchings at different levels
Make the time, increase to level Four and above electrode difference protection coordinates.
Permanent-magnetic switching is realized most important for power distribution network Cooperation with Relay, and the actuation time of permanent-magnetic switching directly closes
It is the differential quantity of protection cooperation, Cooperation with Relay can effectively reduce the transient-power failure number of times that transient fault is caused, improves
The power supply reliability of power distribution network.
The distribution based on permanent-magnetic switching of the present invention multistage electrode difference protection collocation method of built on stilts cable hybrid line, using new
Type permanent-magnetic switching equipment and multistage electrode difference protection configuring technical realize of short duration caused by transient fault in reduction power distribution network stopping
The target of electric number of times, can effectively prevent user side failure from causing the generation of all fronts power-off condition, and the power supply for improving power distribution network can
By property.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of multistage electrode difference protection system of the built on stilts cable hybrid line of distribution based on permanent-magnetic switching, is characterized in that：Including many
The controlling switch of individual level, by the action opening time for arranging different controlling switches, when making certain line fault, the only circuit
The corresponding level controlling switch action of residing branch, forms multistage electrode difference protection.
2. a kind of distribution based on permanent-magnetic switching as claimed in claim 1 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：The controlling switch is electromagnetic switch, is to be broken using the vacuum of permanent-magnet manipulating mechanism and contactless actuation techniques
Road device.
3. a kind of distribution based on permanent-magnetic switching as claimed in claim 1 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：Including built on stilts part and the protective loop of cable section, the protective loop of the built on stilts part includes and power transformation
The on-load switch of outlet switch of standing connection, the on-load switch controls the break-make of some branch roads, by feeder line point on each branch road
If switch control rule main line user's branch road, user's branch road is demarcated using different user demarcation switches；
The protective loop of the cable section includes the block switch being segmented to ring main unit branch road and is connected with block switch
Multiple ring main unit outlet switchs；
By arranging transformer station's outlet switch, feeder branch switch, user demarcation switch, block switch and ring main unit outlet
The action opening time of switch, forms multistage electrode difference protection.
4. a kind of distribution based on permanent-magnetic switching as claimed in claim 3 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：Transformer station's outlet switch is to be arranged in transformer station the switch with the junction of backbone.
5. a kind of distribution based on permanent-magnetic switching as claimed in claim 3 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：User demarcation switch is arranged at distribution line T interfaces, can effective user-isolated boundary's internal fault area
Domain, to protect the normal operation of non-fault line.
6. a kind of distribution based on permanent-magnetic switching as claimed in claim 3 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：The ring main unit outlet switch is the switch for being arranged at backbone or branch line and the junction of ring main unit.
7. a kind of distribution based on permanent-magnetic switching as claimed in claim 3 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：The feeder branch switch is the switch for being arranged at backbone and the junction of branch line.
8. a kind of distribution based on permanent-magnetic switching as claimed in claim 3 makes somebody a mere figurehead the multistage electrode difference protection system of cable hybrid line
System, is characterized in that：The feeder line section switch are for the switch of segmentation in backbone.
9. a kind of multistage electrode difference protection method of the built on stilts cable hybrid line of distribution based on permanent-magnetic switching, is characterized in that：Using many
Individual electromagnetic switch, is positioned on backbone, branch line and load branch circuit, forms multiple protection levels, by adjusting each electricity
The action opening time of magnetic switch, when making certain branch trouble, the corresponding electromagnetic switch action of branch only residing for the branch road is formed
Multistage electrode difference protection.
10. a kind of distribution based on permanent-magnetic switching as claimed in claim 9 makes somebody a mere figurehead the multistage electrode difference protection side of cable hybrid line
Method, is characterized in that：The protection act delay adjustmentses of electromagnetic switch are 100～150ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611147567.7A CN106655122A (en) | 2016-12-13 | 2016-12-13 | Multilevel differential protection system and method of power distribution overhead-cable mixed lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611147567.7A CN106655122A (en) | 2016-12-13 | 2016-12-13 | Multilevel differential protection system and method of power distribution overhead-cable mixed lines |
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| CN106655122A true CN106655122A (en) | 2017-05-10 |
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| CN201611147567.7A Pending CN106655122A (en) | 2016-12-13 | 2016-12-13 | Multilevel differential protection system and method of power distribution overhead-cable mixed lines |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412124A (en) * | 2018-12-04 | 2019-03-01 | 山东理工大学 | A kind of distribution line phase fault relaying configuration and setting method |
| CN110098599A (en) * | 2019-04-23 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of fault handling method and system of overhead lines combined with cable |
| CN112952781A (en) * | 2021-02-03 | 2021-06-11 | 国网安徽省电力有限公司马鞍山供电公司 | Zero sequence protection setting configuration method for small current grounding system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412124A (en) * | 2018-12-04 | 2019-03-01 | 山东理工大学 | A kind of distribution line phase fault relaying configuration and setting method |
| CN110098599A (en) * | 2019-04-23 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of fault handling method and system of overhead lines combined with cable |
| CN110098599B (en) * | 2019-04-23 | 2024-03-15 | 中国电力科学研究院有限公司 | Fault processing method and system for overhead line-cable hybrid line |
| CN112952781A (en) * | 2021-02-03 | 2021-06-11 | 国网安徽省电力有限公司马鞍山供电公司 | Zero sequence protection setting configuration method for small current grounding system |
| CN112952781B (en) * | 2021-02-03 | 2023-07-04 | 国网安徽省电力有限公司马鞍山供电公司 | Zero-sequence protection setting configuration method for small-current grounding system |
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Application publication date: 20170510 |