CN203312808U - Shunt reactor compensation circuit - Google Patents
Shunt reactor compensation circuit Download PDFInfo
- Publication number
- CN203312808U CN203312808U CN2013203080668U CN201320308066U CN203312808U CN 203312808 U CN203312808 U CN 203312808U CN 2013203080668 U CN2013203080668 U CN 2013203080668U CN 201320308066 U CN201320308066 U CN 201320308066U CN 203312808 U CN203312808 U CN 203312808U
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- phase
- shunt reactor
- breaker
- vacuum circuit
- circuit
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Abstract
The utility model discloses a shunt reactor compensation circuit. The compensation circuit comprises a busbar. The busbar is connected with a three-phase mechanism independent control vacuum circuit breaker which is connected with a shunt reactor. According to the utility model, the three-phase mechanism independent control vacuum circuit breaker is used, and the current interruption process adopts a control strategy in which the first pole to clear is broken after zero-crossing, and the other two poles are broken with delay so as to achieve the maximization of the arcing time of the first pole to clear and the contact spacing in arc extinguishing, thereby preventing the re-arcing of the first pole and equivalent chopping of the other two poles, and effectively preventing the overvoltage phenomenon occurred while the shunt reactor is switched by the vacuum circuit breaker.
Description
Technical field
The utility model relates to a kind of shunt reactor compensation circuit, relates in particular to a kind of separating brake phase control technology, belongs to the defeated change distribution technique of electric power system field.
Background technology
For regulation voltage and idle, China's electrical network generally, at the 35kV of 220kV transformer station side configuration shunt reactor, adopts the vacuum circuit-breaker switching, and shunt reactor is connected by cable with vacuum circuit-breaker.
When vacuum circuit-breaker cut-offs 35kV isolated neutral system shunt reactor, due to freely shaking of load-side, while normally cut-offfing, first open the phase fracture recovery voltage rate of climb and be far longer than arc control device fracture dielectric strength growth rate, in overwhelming majority arcing time scopes, first open and mutually resume combustion all will occur and puncture.
After first opening and mutually resume combustion occurring, owing to there being the overvoltage effect, resume combustion is recurred, intensity constantly strengthens, the transient current that resume combustion causes is added to due to three alternate interaction couplings on rear biphase current, causes that rear biphase current equivalence dams, and causes strong equivalent cut-off overvoltage, cause the Continuous Breakdown of circuit breaker three-phase fracture, affect circuit breaker both sides all devices.
Simulation Evaluation shows, vacuum circuit-breaker cut-offs 35kV shunt reactor switching overvoltage, and relatively overvoltage is in the 100kV left and right for the reactor side, and alternate overvoltage is in 200 kV left and right, and reactor turn-to-turn overvoltage is in 150 kV left and right; When system was the aircraft carrier line without circuit, relatively overvoltage was in the 100kV left and right for bus bar side, and alternate overvoltage is in 180 kV left and right.
Field measurement shows, vacuum circuit-breaker cut-offs the 35kV shunt reactor, first opens 90% left and right mutually and there will be resume combustion, and 80% left and right shows as and first opens resume combustion continuously → rear two equivalent mutually and dam, and causes strong overvoltage.First opening mutually that resume combustion → rear two equivalent are dammed continuously is that vacuum circuit-breaker cut-offs the topmost overvoltage form of expression of 35kV shunt reactor, all can cause reactor side lightning arrestor movement, is and anti-switching overvoltage accident or abnormal root.When system was the aircraft carrier line without circuit, because bus bar side system direct-to-ground capacitance is very little, the Continuous Breakdown of circuit breaker produced strong impact to bus bar side simultaneously.
Actual motion shows, vacuum circuit-breaker cut-offs 35kV shunt reactor switching overvoltage phenomenon ubiquity, frequently cause shunt reactor turn-to-turn short circuit damage, and the aircraft carrier line cut-offs and resists the typical fault such as cause that bus bar side institute loss on transmission is ruined, especially aircraft carrier line switching anti-bus bar side are formed to special risk, have a strong impact on normal operation and the system safety of 35kV anti-device, in the urgent need to administering.
The actual measurement and the assessment show, conventional vacuum circuit-breaker performance has been in mature and stable, the resume combustion phenomenon of cut-offfing the 35kV shunt reactor is unavoidable.The improvement methods such as the conventional reactor side installing RC rc absorber adopted, overvoltage protection device all are not enough to effectively administer vacuum circuit-breaker and cut-off 35kV shunt reactor switching overvoltage.
The utility model content
For addressing the above problem, the purpose of this utility model is to provide a kind of shunt reactor compensation circuit, the vacuum circuit-breaker that adopts three-phase mechanism independently to control, the separating brake process is adopted to the control strategy first open separating brake after the phase zero passage, rear two phase delay separating brakes, when realization first opened phase arcing time and blow-out, fracture was opened the maximization of distance, thereby avoid first opening the phase resume combustion and rear two equivalent are dammed, effectively administer the generation that vacuum circuit-breaker cut-offs the shunt reactor switching overvoltage.
The utility model, for achieving the above object, adopts following technical scheme:
A kind of shunt reactor compensation circuit, comprise bus, and described bus is connected with the vacuum circuit-breaker that three-phase mechanism independently controls; The vacuum circuit-breaker that described three-phase mechanism independently controls is connected with shunt reactor.
Between the vacuum circuit-breaker that described three-phase mechanism independently controls and shunt reactor, current inductor is installed, described current inductor secondary circuit is connected with controller; Described controller is connected with the vacuum circuit-breaker control loop that three-phase mechanism independently controls.
On described bus, voltage sensor is installed, described voltage sensor secondary circuit is connected with controller.
The beneficial effects of the utility model are: the utility model provides a kind of shunt reactor compensation circuit, employing first opens the control strategy of separating brake after the phase zero passage, rear two phase delay separating brakes to the separating brake process to adopt vacuum circuit-breaker that three-phase mechanism independently controls, when realization first opened phase arcing time and blow-out, fracture was opened the maximization of distance, thereby avoid first opening the phase resume combustion and rear two equivalent are dammed, effectively administer the generation that vacuum circuit-breaker cut-offs the shunt reactor switching overvoltage.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 first opens separating brake after the phase zero passage, rear two phase delay opening time control principle drawings.
Embodiment
As shown in Figure 1, the present embodiment provides a kind of shunt reactor compensation circuit, comprises bus 1, and described bus 1 is connected with the vacuum circuit-breaker 2 that three-phase mechanism independently controls; The vacuum circuit-breaker 2 that described three-phase mechanism independently controls is connected with shunt reactor 4, described shunt reactor 4 other end neutral grounds.Between the vacuum circuit-breaker 2 that described three-phase mechanism independently controls and shunt reactor 4, current transformer 3 is installed, described current inductor 3 secondary circuits are connected with controller 5, and described controller 5 is connected with vacuum circuit-breaker 2 control loops that three-phase mechanism independently controls.On described bus 1, voltage transformer 6 is installed, described voltage sensor 6 secondary circuits are connected with controller 5.
A kind of switching overvoltage improvement method of shunt reactor compensation circuit, comprise the steps: vacuum circuit-breaker 2 "on" positions that three-phase mechanism at first independently controls, and shunt reactor 4 normally moves.After controller 5 was received the separating brake instruction, controller 5 detected current transformer 3 current signals or voltage transformer 6 voltage signals, current value or magnitude of voltage one being made as mutually and first opening phase of zero crossing at first in the vacuum circuit-breaker 2 that three-phase mechanism independently controls.Controller 5 sends by the phase delay time that first opens of setting vacuum circuit-breaker 2 that three-phase mechanism independently controls and first opens the instruction of phase separating brake and make vacuum circuit-breaker 2 that three-phase mechanism independently controls first open after the phase current zero crossing separating brake immediately.With Time Controller 5 by with respect to first opening phase separating brake instruction time delay, being more than or equal to for 1/3rd system power supply cycles, send the instruction of rear two-phase separating brake, the rear two phase delay separating brakes of vacuum circuit-breaker 2 that three-phase mechanism is independently controlled, thus avoid vacuum circuit-breaker to cut-off the generation of shunt reactor switching overvoltage.
As shown in Figure 2, Ia, Ib, Ic are respectively the inductive load electric currents such as three-phase shunt reactor, and point 1, point 4 are to first open phase A phase current zero crossing, and point 2, point 3 are C phase, B phase current zero crossing successively, and T is the supply frequency cycle, t
aFor first opening the firm branch of phase contact, t
BcFor the firm branch of BC phase contact; BC is with respect to A phase retardation separating brake, t
△ For first opening phase zero crossing 1 and the firm branch t of contact
aTime difference, (t
Bc-t
a) for the BC phase with first open the phase A phase retardation time.
Control first opens the t of phase A after current zero-crossing point 1
aContact just divides constantly, the t of BC after point 3
BcContact just divides constantly, the time delay separating brake.
Control t
aThe points of proximity 1 as far as possible, makes to first open the phase arcing time near maximum of T/2, thus the maximization of clearance between open contacts while realizing first opening the blow-out of phase zero passage.For the 50Hz system, T/2 is 10ms, considers that current permanent magnet mechanism opening time control precision is 2ms, can control t
△ ≈ 2 ms, make to first open mutually actual arcing time maximum average in the 8ms left and right.
Control BC phase retardation time (t
Bc-t
a)>=T/3, guarantee for frequency, to be the system of 50Hz point 3 latter firm minute, and T/3 is 6.7ms, and the preferred value of BC phase retardation time is 8～10ms;
The vacuum circuit-breaker of take cut-offs the 35kV shunt reactor and is example, apply above-mentioned separating brake phase control strategy, first open the phase A phase arcing time in the 8ms left and right, during blow-out, clearance between open contacts is more than 12mm, first open the phase fracture and can bear recovery voltage fully, avoid first opening and resume combustion occurs mutually, thereby also avoided rear two-phase to occur that equivalence dams fully, 35kV shunt reactor switching overvoltage has fundamentally obtained effective improvement.
The described a kind of shunt reactor switching overvoltage compensation circuit that cut-offs of the present embodiment, employing first opens the control strategy of separating brake after the phase zero passage, rear two phase delay separating brakes to the separating brake process to adopt vacuum circuit-breaker that three-phase mechanism independently controls, when realization first opened phase arcing time and blow-out, fracture was opened the maximization of distance, thereby avoid first opening the phase resume combustion and rear two equivalent are dammed, thoroughly administer the generation that vacuum circuit-breaker cut-offs the shunt reactor switching overvoltage.
Claims (3)
1. shunt reactor compensation circuit, it is characterized in that: comprise bus (1), described bus (1) is connected with the vacuum circuit-breaker (2) that three-phase mechanism independently controls; The vacuum circuit-breaker (2) that described three-phase mechanism independently controls is connected with shunt reactor (4).
2. a kind of shunt reactor compensation circuit according to claim 1, it is characterized in that: between the vacuum circuit-breaker (2) that described three-phase mechanism independently controls and shunt reactor (4), current inductor (3) is installed, described current inductor (3) secondary circuit is connected with controller (5); Described controller (5) is connected with vacuum circuit-breaker (2) control loop that three-phase mechanism independently controls.
3. a kind of shunt reactor compensation circuit according to claim 1, it is characterized in that: voltage sensor (6) is installed on described bus (1), and described voltage sensor (6) secondary circuit is connected with controller (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203080668U CN203312808U (en) | 2013-05-31 | 2013-05-31 | Shunt reactor compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203080668U CN203312808U (en) | 2013-05-31 | 2013-05-31 | Shunt reactor compensation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203312808U true CN203312808U (en) | 2013-11-27 |
Family
ID=49618983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203080668U Expired - Lifetime CN203312808U (en) | 2013-05-31 | 2013-05-31 | Shunt reactor compensation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203312808U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280801A (en) * | 2013-05-31 | 2013-09-04 | 国家电网公司 | Paralleling reactor compensation circuit and operation overvoltage managing method |
| CN109546628A (en) * | 2018-12-20 | 2019-03-29 | 大连理工大学 | A kind of shunt reactor phase selection cutoff method based on high-speed switch |
-
2013
- 2013-05-31 CN CN2013203080668U patent/CN203312808U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280801A (en) * | 2013-05-31 | 2013-09-04 | 国家电网公司 | Paralleling reactor compensation circuit and operation overvoltage managing method |
| CN103280801B (en) * | 2013-05-31 | 2015-05-06 | 国家电网公司 | Paralleling reactor compensation circuit and operation overvoltage managing method |
| CN109546628A (en) * | 2018-12-20 | 2019-03-29 | 大连理工大学 | A kind of shunt reactor phase selection cutoff method based on high-speed switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |