CN204732872U - A kind of three bridge difference power capacitor apparatus - Google Patents
A kind of three bridge difference power capacitor apparatus Download PDFInfo
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- CN204732872U CN204732872U CN201520416279.1U CN201520416279U CN204732872U CN 204732872 U CN204732872 U CN 204732872U CN 201520416279 U CN201520416279 U CN 201520416279U CN 204732872 U CN204732872 U CN 204732872U
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Abstract
The utility model discloses a kind of three bridge difference power capacitor apparatus, comprise multiple Capacitor banks that phase-splitting is arranged, the Capacitor banks of every phase adopts three bridge differential lines, namely the Capacitor banks of every phase is arranged by the requirement of three electric bridges, each electric bridge includes four capacitor brachium pontis, be connected with current transformer at each electric bridge close to intermediate potential place, the balanced balanced current that Capacitor banks flows through each current transformer in normal state goes to zero.A kind of three bridge difference power capacitor apparatus; when holding element allows overvoltage multiple constant; by a phase one dividing into three of Capacitor banks, effectively the component population reduced in a Gratz connection makes setting value significantly improve, thus the reliability of unbalance protection is significantly improved.Meanwhile, Capacitor banks one is divided into three pylons mutually, reduces Capacitor banks height, effectively improve its shock resistance.
Description
Technical field
The utility model belongs to power capacitor device technical field, relates to a kind of three bridge difference power capacitor apparatus.
Background technology
Positive and negative 1000kV extra-high voltage direct-current transmission engineering is that the highest grade, transmission capacity is maximum in the world, send distance DC transmission engineering farthest, also will become the new height of world's technology of transmission of electricity.Positive and negative 1000kV extra-high voltage direct-current transmission rated direct current in State Grid Corporation of China's planning is 4500A ~ 5000A, capacity will up to 9.5GW ~ 10GW, its operational reliability is most important to power network safety operation, and this has higher requirement to the application level of large-scale capacitor device group.
Along with the development of positive and negative 1000kV extra-high voltage direct-current transmission engineering, on the one hand, make capacitor list group total capacity larger, required capacitor number of units also increases thereupon, and capacitor element quantity is huge especially.Thus, improving high sensitivity and the high reliability of large-scale inner fuse capacitor group unbalance protection, is one of primary condition ensureing large-scale capacitor device group safe and reliable operation; Another side, the Capacitor banks number of plies is got more and more, and device is more and more higher, and again because some area of China is earthquake-prone region, the harm that earthquake brings to electric device loss is inestimable.Thus Capacitor banks height is effectively reduced of equal importance.The single bridge difference unbalance protection of the many employings of capacitance present device group device or Double-bridge difference unbalance protection, based on the reason of above-mentioned two aspects, now propose a kind of three bridge difference power capacitor apparatus.
Utility model content
The purpose of this utility model is to provide a kind of three bridge difference power capacitor apparatus, improves sensitivity and the reliability of Capacitor banks unbalance protection.
The technical scheme that the utility model adopts is: a kind of three bridge difference power capacitor apparatus, comprise multiple Capacitor banks that phase-splitting is arranged, the Capacitor banks of every phase adopts three bridge differential lines, namely the Capacitor banks of every phase is arranged by the requirement of three electric bridges, each electric bridge includes four capacitor brachium pontis, be connected with current transformer at each electric bridge close to intermediate potential place, the balanced balanced current that Capacitor banks flows through each current transformer in normal state goes to zero.
Feature of the present utility model is also:
Three electric bridges are connected between power inleting terminal and neutral point.
Three electric bridges adopt three H type structural configuration.
Three bridge arrangement are on ground.
Current transformer is arranged in pylon outside.
The beneficial effects of the utility model are: a kind of three bridge difference power capacitor apparatus of the utility model; when holding element allows overvoltage multiple constant; by a phase one dividing into three of Capacitor banks; component population in effective minimizing Gratz connection makes setting value significantly improve, thus the reliability of unbalance protection is significantly improved.Meanwhile, Capacitor banks one is divided into three pylons mutually, reduces Capacitor banks height, effectively improve its shock resistance.
Accompanying drawing explanation
Fig. 1 is the single-phase schematic diagram of a kind of three bridge difference power capacitor apparatus of the utility model;
Fig. 2 is the phase structure figure of a kind of three bridge difference power capacitor apparatus of the utility model.
In figure, 1. pedestal column, 2. current transformer a, 3. inner fuse capacitor, 4. framework, 5. interlayer pillar, 6. current transformer b, 7. current transformer c, tower 8., tower 9., tower 10..
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
The structure of a kind of three bridge difference power capacitor apparatus of the utility model, as shown in Figure 1, comprise multiple Capacitor banks that phase-splitting is arranged, the Capacitor banks of every phase adopts three bridge differential lines, namely the Capacitor banks of every phase is arranged by the requirement of three electric bridges, each electric bridge includes four capacitor brachium pontis, current transformer is connected with close to intermediate potential place at each electric bridge, the balanced balanced current that Capacitor banks flows through each current transformer in normal state goes to zero, three electric bridges are connected between power inleting terminal and neutral point, three electric bridges adopt three H type structural configuration, three bridge arrangement are on ground, current transformer is arranged in pylon outside.
Fig. 2 is the view of the phase Capacitor banks in positive and negative 1000kV extra-high voltage direct-current transmission engineering in HP12/24C1 capacitor device, and this phase Capacitor banks corresponds to the single-phase schematic diagram of three bridge differential line capacitor groups in Fig. 1, and it can be implemented by mode below:
Three electric bridges are in series with between high pressure end of incoming cables and low-pressure line-outgoing end, three electric bridges are connected to front tower 8 in turn, in middle tower 9 and rear tower 10, front tower 8, middle tower 9 and rear tower 10 all comprise pedestal column 1, pedestal column 1 is arranged two-layer or two-layer with upper frame 4, framework 4 is provided with some inner fuse capacitors 3, form Capacitor banks, be connected and fixed by interlayer pillar 5 between adjacent framework 4, the intermediate potential place of three electric bridges is connected to current transformer a2, current transformer b6 summation current transformer c7, capacitor component two row lies on one's side and is arranged on framework 4, current transformer a2, current transformer b6 summation current transformer c7 is arranged in front tower 8, the outside of middle tower 9 and rear tower 10,
Upper 5 layer capacitor groups on front side of front tower form Capacitor banks Cl, and the lower 3 layer capacitor groups on front side of front tower form Capacitor banks C3; Upper 5 layer capacitor groups on rear side of front tower form Capacitor banks C2, and the lower 3 layer capacitor groups on rear side of front tower form Capacitor banks C4.Upper 5 layer capacitor groups on front side of middle tower form Capacitor banks C5, and the lower 3 layer capacitor groups on front side of middle tower form Capacitor banks C7; Upper 5 layer capacitor groups on rear side of middle tower form Capacitor banks C6, and the lower 3 layer capacitor groups on rear side of middle tower form Capacitor banks C8.Upper 4 layer capacitor groups on front side of rear tower form Capacitor banks C9, and the lower 3 layer capacitor groups on front side of rear tower form Capacitor banks C11; Upper 4 layer capacitor groups on rear side of rear tower form Capacitor banks C10, and the lower 3 layer capacitor groups on rear side of rear tower form Capacitor banks C12;
Three electric bridges are connected between A1 and A2, each electric bridge comprises four brachium pontis that Capacitor banks is formed, namely Capacitor banks Cl, C2, C3, C4 forms first electric bridge, and Capacitor banks C5, C6, C7, C8 form second electric bridge, and Capacitor banks C7, C8, C9, C10 form the 3rd electric bridge.Be connected with current transformer at the intermediate potential place of each electric bridge, the balanced balanced current that Capacitor banks flows through each current transformer in normal state goes to zero.
A kind of three bridge difference power capacitor apparatus; when holding element allows overvoltage multiple constant; by a phase one dividing into three of Capacitor banks, effectively the component population reduced in a Gratz connection makes setting value significantly improve, thus the reliability of unbalance protection is significantly improved.Meanwhile, Capacitor banks one is divided into three pylons mutually, reduces Capacitor banks height, effectively improve its shock resistance.
Claims (5)
1. a bridge difference power capacitor apparatus, comprise multiple Capacitor banks that phase-splitting is arranged, it is characterized in that, the Capacitor banks of every phase adopts three bridge differential lines, namely the Capacitor banks of every phase is arranged by the requirement of three electric bridges, each electric bridge includes four capacitor brachium pontis, is connected with current transformer at each electric bridge close to intermediate potential place, and the balanced balanced current that Capacitor banks flows through each current transformer in normal state goes to zero.
2. a kind of three bridge difference power capacitor apparatus according to claim 1, it is characterized in that, described three electric bridges are connected between power inleting terminal and neutral point.
3. a kind of three bridge difference power capacitor apparatus according to claim 1, it is characterized in that, described three electric bridges adopt three H type structural configuration.
4. a kind of three bridge difference power capacitor apparatus according to claim 1, it is characterized in that, described three bridge arrangement are on ground.
5. a kind of three bridge difference power capacitor apparatus according to claim 1, it is characterized in that, described current transformer is arranged in pylon outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416279.1U CN204732872U (en) | 2015-06-17 | 2015-06-17 | A kind of three bridge difference power capacitor apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416279.1U CN204732872U (en) | 2015-06-17 | 2015-06-17 | A kind of three bridge difference power capacitor apparatus |
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| CN204732872U true CN204732872U (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520416279.1U Active CN204732872U (en) | 2015-06-17 | 2015-06-17 | A kind of three bridge difference power capacitor apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707102A (en) * | 2016-12-09 | 2017-05-24 | 中国西电电气股份有限公司 | Capacitor bank main wiring structure and fault judgment method |
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2015
- 2015-06-17 CN CN201520416279.1U patent/CN204732872U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707102A (en) * | 2016-12-09 | 2017-05-24 | 中国西电电气股份有限公司 | Capacitor bank main wiring structure and fault judgment method |
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