CN202383209U - Parasitic parameter analysis circuit of power capacitor-reactor series loop - Google Patents
Parasitic parameter analysis circuit of power capacitor-reactor series loop Download PDFInfo
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- CN202383209U CN202383209U CN2011205627374U CN201120562737U CN202383209U CN 202383209 U CN202383209 U CN 202383209U CN 2011205627374 U CN2011205627374 U CN 2011205627374U CN 201120562737 U CN201120562737 U CN 201120562737U CN 202383209 U CN202383209 U CN 202383209U
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- 230000003071 parasitic effect Effects 0.000 title claims abstract description 28
- 238000004458 analytical method Methods 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 abstract description 10
- 230000009897 systematic effect Effects 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract 1
- 230000004936 stimulating effect Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 5
- 238000010219 correlation analysis Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012097 association analysis method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a parasitic parameter analysis circuit of a power capacitor-reactor series loop. The circuit is provided based on the condition that according to systematic analysis, a parasitic capacitor (also called ground capacitor or distributed capacitor) which exists in a power grid and is neglected by people for a long time is one of the technical reasons of causing the explosion of the circuit breaker of a power system capacitor. According to the analysis circuit disclosed by the utility model, the problems existing in parameter configuration that the capacity of a capacitor in a power distribution network is 1000-12000KVAR and a series reactor is 1-12% through directly stimulating current and voltage distribution rules in the mechanical movement process and electrical process of the breaker can be calculated and analyzed, hereby, a basic strategy capable of avoiding such influence is provided and a reliable foundation is established for improving the safe operation of the power grid.
Description
Technical field
The utility model relates to a kind of power capacitor, the reactor series loop parasitic parameter association analysis method to switching overvoltage.
Background technology
Internal short-circuit takes place and bursts accident in 10 kilovolts of capacitors of transformer station, reactor loop in operating process for a long time.The application unit is through a large amount of instance investigation, analysis; Find that through experiment 10 kilovolts of power capacitors of transformer station, reactor series loop parasitic parameter are very big for the amplitude influence of switching overvoltage again, the isolating switch cabinet scaling loss that has an accident is all relevant with parasitic parameter.
The simulation study that the making process of the vacuum circuit breaker through system for distribution network of power being disposed capacitor loops carries out; Found that long-term existence is in electrical network and to be ignored stray capacitance (also claiming ground capacitance or distributed capacitance) by people for a long time be to cause one of major reason that electric system capacitor loops isolating switch bursts; To the theoretical simulation result; Field wiring mode through the simulation electric system; The correlation parameter of the electric system actual operating that configuration is relevant has carried out measured test to this kind phenomenon, and applying unit has confirmed the outwardness of this stray capacitance through actual measurement.
In view of this, be necessary according to simulation analysis and measured result, propose a kind of new analysis circuit, can be used for the current and power supply regularity of distribution of the operating process of system-computed analysis or analogue simulation isolating switch, assessing for the short-circuit risks of transformer station provides foundation.
Summary of the invention
In view of this, the purpose of the utility model power capacitor-reactor series loop parasitic parameter analysis circuit of providing a kind of compact conformation, being easy to use.
The purpose of the utility model realizes through following technical scheme:
This circuit comprises substation bus bar three-phase supply loop;
Substation bus bar three-phase supply loop links with three-phase power capacitor-reactor series loop respectively through three-phase breaker; Wherein the power output end of A phase is A phase parasitic loop between the isolating switch with A mutually; A phase parasitic loop comprises resistance R ak, capacitor C amo, inductance L amo; Wherein capacitor C amo is with after inductance L cmo is parallelly connected, and an end inserts A phase power output end and the A common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said A phase power capacitor-reactor series loop comprises resistance R ax, reactance Lax and the capacitor C ax that is cascaded successively, and the common junction of said A phase isolating switch and resistance R ax is through capacitor C ao ground connection;
The power output end of B phase is B phase parasitic loop between the isolating switch with B mutually; B phase parasitic loop comprises resistance R bk, capacitor C bmo, inductance L bmo; Wherein capacitor C bmo is with after inductance L bmo is parallelly connected; One end inserts B phase power output end and the B common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said B phase power capacitor-reactor series loop comprises resistance R bx, reactance Lbx and the capacitor C bx that is cascaded successively, and the common junction of said B phase isolating switch and resistance R bx is through capacitor C bo ground connection;
The power output end of C phase is C phase parasitic loop between the isolating switch with C mutually; C phase parasitic loop comprises resistance R ck, capacitor C cmo, inductance L cmo; Wherein capacitor C cmo is with after inductance L cmo is parallelly connected; One end inserts C phase power output end and the C common junction between the isolating switch mutually, other end ground connection through resistance R ck; Said C phase power capacitor-reactor series loop comprises resistance R cx, reactance Lcx and the capacitor C cx that is cascaded successively, and the common junction of said C phase isolating switch and resistance R cx is through capacitor C co ground connection;
The other end of said capacitor C ax, Cbx and Ccx is through capacitor C zo ground connection.
The beneficial effect of the utility model is:
The utility model is according to systematic analysis; Found long-term existence in electrical network and the existence of the stray capacitance of being ignored by people for a long time (also in couples certainly or distributed capacitance) be cause one of technical reason that electric system capacitor loops isolating switch bursts; The analysis circuit that proposes according to this; The analysis circuit of the utility model can be directly through simulating the current/voltage regularity of distribution in breaker mechanical motion process and the electric process; Thereby calculate, analyze the power distribution network condenser capacity from 1000～12000KVAR, the current-limiting reactor problem place from 1～12% parameter configuration; Propose to avoid the elementary tactics of this influence in view of the above, for reliable basis is established in the safe operation that improves electrical network.
Other advantages, target and the characteristic of the utility model will be set forth in instructions subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from the practice of the utility model, obtain instruction to investigating of hereinafter.The target of the utility model and other advantages can realize and obtain through following instructions and claims.
Description of drawings
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done further to describe in detail below, wherein:
Fig. 1 is the circuit model structural representation of the utility model;
Fig. 2 connects synoptic diagram for the utility model adopts the substation bus bar three-phase supply loop of delta connection.
Embodiment
Below will be with reference to accompanying drawing, the preferred embodiment of the utility model is carried out detailed description.Should be appreciated that preferred embodiment has been merely explanation the utility model, rather than in order to limit the protection domain of the utility model.
As shown in the figure, the analysis equivalent electrical circuit of the utility model comprises substation bus bar three-phase supply loop, and substation bus bar three-phase supply loop links with three-phase power capacitor-reactor series loop respectively through three-phase breaker;
Wherein the power output end of A phase is A phase parasitic loop between the isolating switch with A mutually; A phase parasitic loop comprises resistance R ak, capacitor C amo, inductance L amo; Wherein capacitor C amo is with after inductance L cmo is parallelly connected; One end inserts A phase power output end and the A common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said A phase power capacitor-reactor series loop comprises resistance R ax, reactance Lax and the capacitor C ax that is cascaded successively, and the common junction of said A phase isolating switch and resistance R ax is through capacitor C ao ground connection;
The power output end of B phase is B phase parasitic loop between the isolating switch with B mutually; B phase parasitic loop comprises resistance R bk, capacitor C bmo, inductance L bmo; Wherein capacitor C bmo is with after inductance L bmo is parallelly connected; One end inserts B phase power output end and the B common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said B phase power capacitor-reactor series loop comprises resistance R bx, reactance Lbx and the capacitor C bx that is cascaded successively, and the common junction of said B phase isolating switch and resistance R bx is through capacitor C bo ground connection;
The power output end of C phase is C phase parasitic loop between the isolating switch with C mutually; C phase parasitic loop comprises resistance R ck, capacitor C cmo, inductance L cmo; Wherein capacitor C cmo is with after inductance L cmo is parallelly connected; One end inserts C phase power output end and the C common junction between the isolating switch mutually, other end ground connection through resistance R ck; Said C phase power capacitor-reactor series loop comprises resistance R cx, reactance Lcx and the capacitor C cx that is cascaded successively, and the common junction of said C phase isolating switch and resistance R cx is through capacitor C co ground connection;
The other end of said capacitor C ax, Cbx and Ccx is through capacitor C zo ground connection.
Three-phase supply loop as shown in Figure 2, that the bus power supply of transformer station can adopt the △ type to connect, wherein A phase electric power loop comprises resistance R an and reactance Lan and the power supply Ua that is cascaded, the contact between Ran and the reactance Lan is through capacitor C yao ground connection; B comprises resistance R bn, reactance Lbn and the power supply Ub that is cascaded mutually, and the contact between resistance R bn, the reactance Lbn is through capacitor C ybo ground connection; C comprises resistance R cn, reactance Lcn and the power supply Uc that is cascaded mutually, and the contact between resistance R cn, the reactance Lcn is through capacitor C yco ground connection.Certainly, the three-phase supply loop that also can adopt the Y type to connect, its connecting mode belongs to the common practise of this area, repeats no more at this;
This analysis circuit can advance in the bare machine through software solidification through the form of realistic model, forms correlation analysis system; During use; The correlation parameter that needs are analyzed is imported correlation analysis system; Can obtain the correlation circumstance of parasitic parameter; Thereby analyze the current/voltage regularity of distribution in breaker mechanical motion process and the electric process, thereby calculated, analyzed the power distribution network condenser capacity from 1000～12000KVAR, the current-limiting reactor problem place from 1～12% parameter configuration, the superpotential short-circuit risks analysis of complete operation.
The utility model overcome the technological prejudice of existing monitoring technology, fully realized the harm that stray capacitance produces, and for supplying the monitoring in time of distribution enterprise and handling the substation bus bar short-circuit risks a kind of practical and analytical model safely and efficiently is provided.
Explanation is at last; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Although with reference to preferred embodiment the utility model is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical scheme of the utility model; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the utility model.
Claims (1)
1. power capacitor-reactor series loop parasitic parameter analysis circuit, it is characterized in that: said circuit comprises substation bus bar three-phase supply loop;
Substation bus bar three-phase supply loop links with three-phase power capacitor-reactor series loop respectively through three-phase breaker; Wherein the power output end of A phase is A phase parasitic loop between the isolating switch with A mutually; A phase parasitic loop comprises resistance R ak, capacitor C amo, inductance L amo; Wherein capacitor C amo is with after inductance L cmo is parallelly connected, and an end inserts A phase power output end and the A common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said A phase power capacitor-reactor series loop comprises resistance R ax, reactance Lax and the capacitor C ax that is cascaded successively, and the common junction of said A phase isolating switch and resistance R ax is through capacitor C ao ground connection;
The power output end of B phase is B phase parasitic loop between the isolating switch with B mutually; B phase parasitic loop comprises resistance R bk, capacitor C bmo, inductance L bmo; Wherein capacitor C bmo is with after inductance L bmo is parallelly connected; One end inserts B phase power output end and the B common junction between the isolating switch mutually, other end ground connection through resistance R ak; Said B phase power capacitor-reactor series loop comprises resistance R bx, reactance Lbx and the capacitor C bx that is cascaded successively, and the common junction of said B phase isolating switch and resistance R bx is through capacitor C bo ground connection;
The power output end of C phase is C phase parasitic loop between the isolating switch with C mutually; C phase parasitic loop comprises resistance R ck, capacitor C cmo, inductance L cmo; Wherein capacitor C cmo is with after inductance L cmo is parallelly connected; One end inserts C phase power output end and the C common junction between the isolating switch mutually, other end ground connection through resistance R ck; Said C phase power capacitor-reactor series loop comprises resistance R cx, reactance Lcx and the capacitor C cx that is cascaded successively, and the common junction of said C phase isolating switch and resistance R cx is through capacitor C co ground connection;
The other end of said capacitor C ax, Cbx and Ccx is through capacitor C zo ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205627374U CN202383209U (en) | 2011-12-29 | 2011-12-29 | Parasitic parameter analysis circuit of power capacitor-reactor series loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205627374U CN202383209U (en) | 2011-12-29 | 2011-12-29 | Parasitic parameter analysis circuit of power capacitor-reactor series loop |
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| CN202383209U true CN202383209U (en) | 2012-08-15 |
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| CN2011205627374U Expired - Lifetime CN202383209U (en) | 2011-12-29 | 2011-12-29 | Parasitic parameter analysis circuit of power capacitor-reactor series loop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675469A (en) * | 2013-12-31 | 2014-03-26 | 西安兴汇电力科技有限公司 | Distributed capacitance measurement device and measurement method for high-voltage line |
-
2011
- 2011-12-29 CN CN2011205627374U patent/CN202383209U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675469A (en) * | 2013-12-31 | 2014-03-26 | 西安兴汇电力科技有限公司 | Distributed capacitance measurement device and measurement method for high-voltage line |
| CN103675469B (en) * | 2013-12-31 | 2016-04-13 | 西安兴汇电力科技有限公司 | A kind of high-tension line distributed capacitance measurement mechanism and measuring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121206 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121206 Address after: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee after: Qinan Power Supply Bureau of Chongqing Power Co. Patentee after: State Grid Corporation of China Address before: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Patentee before: Qinan Power Supply Bureau of Chongqing Power Co. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120815 |