CN103904625A - Method for protecting branch line - Google Patents
Method for protecting branch line Download PDFInfo
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- CN103904625A CN103904625A CN201410024544.1A CN201410024544A CN103904625A CN 103904625 A CN103904625 A CN 103904625A CN 201410024544 A CN201410024544 A CN 201410024544A CN 103904625 A CN103904625 A CN 103904625A
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- branch line
- fault
- line switch
- switch
- reclosing
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Abstract
The invention relates to a method for protecting a branch line. In an ungrounded system or a system grounded through an arc suppression coil or a system grounded through a small resistor, a compatible branch line switch is a breaker or a load switch, different protection mechanisms are adopted for the short circuit fault and the single-phase grounding fault of different types, and therefore faults of the user branch line can be effectively isolated. The user branch line where faults of the power distribution network frequently occur is reasonably and effectively controlled, and therefore large-area power outrage of the power distribution network is avoided, complex fault point finding work is reduced, and power distribution reliability of the power distribution network is improved greatly.
Description
Technical field
The present invention relates to a kind of protection method of operating of branch line.
Background technology
10kV distribution line design feature is complicated and changeable, if any be user's special line, one, two users of a tape splicing, are similar to transmission line; Being of having is radial, and tens station power distribution transformer T even up to a hundred are connected in each branch of same circuit; Some circuits are the outlets of 35kV electric substation, and some circuits are the outlets of 110kV electric substation; Some circuits belong to final stage protection, and some circuits are provided with switchyard or have customer substation etc.User's branched line is the relative final stage of distribution line, the most various circuit again, and it is a kind of effective means of isolating distribution network failure that user's branched line is configured to independent protection.On user's branched line, configuration " house dog " is a kind of more general way at present, if but can not choose a kind of reasonable, unified motion mechanism to a large amount of " house dog ", not only can not reach user's branched line fault is carried out to the effectively original intention of isolation, even can run counter to desire.
Therefore, the inventor makes further research this, develops a kind of protection method of operating of branch line, and this case produces thus.
Summary of the invention
The object of the present invention is to provide a kind of protection method of operating of branch line, for the short trouble fault type different with single phase ground fault, adopt different protection motion mechanisms.
A kind of protection method of operating of branch line; at isolated neutral system, compensated distribution network or in small resistance grounding system; and can compatible branch line switch be circuit breaker or on-load switch; for the short trouble fault type different with single phase ground fault; adopt different protection motion mechanisms, can reach user's branched line fault is carried out to the effectively object of isolation.
Further, when branch line switch is circuit breaker, earthing mode is earth-free or in the time of extinguishing arc ground connection, when there is phase-to phase fault, its course of action is: transient fault, the success of branch line switch phase overcurrent tripping-> reclosing; Permanent fault, branch line switch phase overcurrent tripping-> reclosing-> branch line switch phase overcurrent tripping.
Further, when branch line switch is circuit breaker, earthing mode is earth-free or in the time of extinguishing arc ground connection, when there is single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence overcurrent tripping-> reclosing; Permanent fault, branch line switch zero sequence overcurrent tripping-> reclosing-> branch line switch zero sequence overcurrent tripping.
Further, when branch line switch is circuit breaker, earthing mode is through low resistance grounding, and when there is alternate or single phase ground fault, its course of action is all: transient fault, the success of branch line switch trip-> reclosing; Permanent fault, branch line switch trip-> reclosing-> branch line switch trip.
Further, when branch line switch is on-load switch, earthing mode is earth-free or in the time of extinguishing arc ground connection, when occurring phase-to phase fault, its course of action is: transient fault, the success of the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing; Permanent fault, the outlet switch tripping operation-> of transformer station branch line switch phase overcurrent tripping-> reclosing-> outlet switch Accelerated trip-> of transformer station branch line switch phase overcurrent tripping.
Further, when branch line switch is on-load switch, earthing mode is earth-free or in the time of extinguishing arc ground connection, when there is single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence overcurrent tripping-> reclosing; Permanent fault, branch line switch zero sequence overcurrent tripping-> reclosing-> branch line switch zero sequence overcurrent tripping.
Further, when branch line switch is on-load switch, earthing mode is through low resistance grounding, when occurring phase-to phase fault, its course of action is: transient fault, the success of the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing; Permanent fault, the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing-> outlet switch Accelerated trip-> of transformer station branch line switch trip.
Further, when branch line switch is on-load switch, earthing mode is through low resistance grounding, and when there is single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence tripping operation-> reclosing; Permanent fault, branch line switch zero sequence tripping operation-> reclosing-> branch line switch trip.
Adopt after such scheme, the present invention compared with prior art, has the following advantages:
User's branch line at the multiple place of distribution network failure is obtained rationally, effectively control, thereby avoid power distribution network to have a power failure on a large scale, the searching work that reduces the fault point loaded down with trivial details, improves the power supply reliability of power distribution network greatly.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.
The protection method of operating of a kind of branch line that the present invention discloses; at isolated neutral system, compensated distribution network or in small resistance grounding system; and can compatible branch line switch be circuit breaker or on-load switch; for the short trouble fault type different with single phase ground fault; adopt different protection motion mechanisms, can reach user's branched line fault is effectively isolated.
Technical scheme:
Branch line protection configuration: " phase overcurrent protection ", is used for identifying phase fault; " zero sequence overcurrent protection ", is used for identifying single phase ground fault; " reclosing ", solves transient fault.The definite value title of each protection and being described as follows shown in table:
Protection action scheme in various situations is as shown in the table:
Note: in the time that fault current is greater than the non-breaking current definite value of switch, all trip protection outlets of locking.
The beneficial effect of this programme is: user's branch line at the multiple place of distribution network failure is obtained rationally, effectively control, thereby avoid power distribution network to have a power failure on a large scale, the searching work that reduces the fault point loaded down with trivial details, improves the power supply reliability of power distribution network greatly.
Claims (8)
1. the protection method of operating of a branch line; it is characterized in that: at isolated neutral system, compensated distribution network or in small resistance grounding system; and can compatible branch line switch be circuit breaker or on-load switch; for the short trouble fault type different with single phase ground fault; adopt different protection motion mechanisms, can reach user's branched line fault is carried out to the effectively object of isolation.
2. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is circuit breaker, earthing mode is earth-free or in the time of extinguishing arc ground connection, when occurring phase-to phase fault, its course of action is: transient fault, the success of branch line switch phase overcurrent tripping-> reclosing; Permanent fault, branch line switch phase overcurrent tripping-> reclosing-> branch line switch phase overcurrent tripping.
3. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is circuit breaker, earthing mode is earth-free or in the time of extinguishing arc ground connection, when occurring single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence overcurrent tripping-> reclosing; Permanent fault, branch line switch zero sequence overcurrent tripping-> reclosing-> branch line switch zero sequence overcurrent tripping.
4. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is circuit breaker, earthing mode is through low resistance grounding, when occurring alternate or single phase ground fault, its course of action is all: transient fault, the success of branch line switch trip-> reclosing; Permanent fault, branch line switch trip-> reclosing-> branch line switch trip.
5. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is on-load switch, earthing mode is earth-free or in the time of extinguishing arc ground connection, when occurring phase-to phase fault, its course of action is: transient fault, the success of the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing; Permanent fault, the outlet switch tripping operation-> of transformer station branch line switch phase overcurrent tripping-> reclosing-> outlet switch Accelerated trip-> of transformer station branch line switch phase overcurrent tripping.
6. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is on-load switch, earthing mode is earth-free or in the time of extinguishing arc ground connection, when occurring single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence overcurrent tripping-> reclosing; Permanent fault, branch line switch zero sequence overcurrent tripping-> reclosing-> branch line switch zero sequence overcurrent tripping.
7. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is on-load switch, earthing mode is through low resistance grounding, when occurring phase-to phase fault, its course of action is: transient fault, the success of the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing; Permanent fault, the outlet switch tripping operation-> of transformer station branch line switch trip-> reclosing-> outlet switch Accelerated trip-> of transformer station branch line switch trip.
8. the protection method of operating of a kind of branch line according to claim 1, it is characterized in that: when branch line switch is on-load switch, earthing mode is through low resistance grounding, when occurring single phase ground fault, its course of action is: transient fault, the success of branch line switch zero sequence tripping operation-> reclosing; Permanent fault, branch line switch zero sequence tripping operation-> reclosing-> branch line switch trip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024544.1A CN103904625B (en) | 2014-01-20 | 2014-01-20 | A kind of protection act method of branch line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024544.1A CN103904625B (en) | 2014-01-20 | 2014-01-20 | A kind of protection act method of branch line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103904625A true CN103904625A (en) | 2014-07-02 |
| CN103904625B CN103904625B (en) | 2018-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410024544.1A Active CN103904625B (en) | 2014-01-20 | 2014-01-20 | A kind of protection act method of branch line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026090A (en) * | 2016-07-14 | 2016-10-12 | 国网四川省电力公司电力科学研究院 | Urban distribution network hybrid grounding system load transfer method |
| CN108802569A (en) * | 2018-06-14 | 2018-11-13 | 贵州电网有限责任公司 | Distribution circuit single-phase earth fault positioning based on voltage and current type and partition method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0564355A (en) * | 1991-08-30 | 1993-03-12 | Toyoda Gosei Co Ltd | Reverse power protection method for network power distribution |
| CN102270835A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN102368612A (en) * | 2011-10-26 | 2012-03-07 | 浙江省电力公司 | Triple-double wiring way of medium-voltage electric distribution network |
| CN203071571U (en) * | 2013-01-10 | 2013-07-17 | 永康市供电局 | Intelligent monitoring device for distributed boundary switches |
-
2014
- 2014-01-20 CN CN201410024544.1A patent/CN103904625B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0564355A (en) * | 1991-08-30 | 1993-03-12 | Toyoda Gosei Co Ltd | Reverse power protection method for network power distribution |
| CN102270835A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN102368612A (en) * | 2011-10-26 | 2012-03-07 | 浙江省电力公司 | Triple-double wiring way of medium-voltage electric distribution network |
| CN203071571U (en) * | 2013-01-10 | 2013-07-17 | 永康市供电局 | Intelligent monitoring device for distributed boundary switches |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026090A (en) * | 2016-07-14 | 2016-10-12 | 国网四川省电力公司电力科学研究院 | Urban distribution network hybrid grounding system load transfer method |
| CN108802569A (en) * | 2018-06-14 | 2018-11-13 | 贵州电网有限责任公司 | Distribution circuit single-phase earth fault positioning based on voltage and current type and partition method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103904625B (en) | 2018-01-30 |
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