CN102437574A - Association analysis method using parasitic parameters of capacitor-reactor series circuit - Google Patents
Association analysis method using parasitic parameters of capacitor-reactor series circuit Download PDFInfo
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- CN102437574A CN102437574A CN201110450575XA CN201110450575A CN102437574A CN 102437574 A CN102437574 A CN 102437574A CN 201110450575X A CN201110450575X A CN 201110450575XA CN 201110450575 A CN201110450575 A CN 201110450575A CN 102437574 A CN102437574 A CN 102437574A
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- 230000003071 parasitic effect Effects 0.000 title claims abstract description 38
- 238000012097 association analysis method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000010219 correlation analysis Methods 0.000 claims description 6
- 238000012098 association analyses Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012502 risk assessment Methods 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003012 network analysis Methods 0.000 description 2
- 238000010205 computational analysis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The invention discloses an association analysis method using parasitic parameters of a capacitor-reactor series circuit. The association analysis method comprises the following steps: 1. establishing an equivalent circuit model for technical analysis of the switching on-off operation process of the power capacitor-reactor series circuit; 2. solidifying the circuit model in a software manner to enter a hardware computer so as to form an association analysis system; and 3. inputting related parameters which need to be analyzed into the association analysis system so as to complete short-circuit risk analysis in the case of operating over-voltage. The association analysis method has the beneficial effects that the current and voltage distribution regularity during the mechanical movement process and the power cut-out process of a circuit breaker can be directly calculated, analyzed and simulated by the circuit model so as to calculate and analyze problems in parameter configuration such as capacity of a capacitor of an electric distribution network of 1000-12000KVAR and the reactance ratio of a series reactor of 1-12% and further put forward evasion strategies, which provides a new way and method for eliminating circuit operation accidents due to poor law factor of the electric distribution network and lays a reliable foundation for improving operation safety of the electric distribution network.
Description
Technical field
The present invention relates to a kind of power capacitor-reactor series loop parasitic parameter that used switching overvoltage is carried out association analysis, thus the method for judgement transformer station short-circuit risks.
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 circuit breaker 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 parasitic capacitance (also claiming direct-to-ground capacitance or distributed capacitance) by people for a long time be to cause one of major reason that electric power system capacitor loops circuit breaker bursts; To the theoretical simulation result; Field connection mode through the simulation electric power system; The relevant parameter of the electric power system actual operating that configuration is relevant has carried out measured test to this kind phenomenon, and applying unit has confirmed the objective reality of this parasitic capacitance through actual measurement.
In view of this; Be necessary according to simulation analysis and measured result; Propose a kind of new method, can the network analysis parasitic capacitance participate in circuit breaker branch-group photo Operations Analyst circuit, the current and power supply regularity of distribution in the operating process of computational analysis or analogue simulation circuit breaker.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of association analysis method that uses power capacitor-reactor series loop parasitic parameter.Thereby for eliminating the low rule factor loop of distribution (power capacitor, reactor compensation) operating accident new approaches and methods is provided, for reliable basis is established in the safe operation that improves electrical network.
The objective of the invention is to realize through following technical scheme:
The association analysis method that this has utilized capacitor-reactor series loop parasitic parameter said method comprising the steps of:
Step 1: set up power capacitor, reactor series loop to close-the sub-switching operation process technology analyzes equivalent-circuit model;
Step 2: the foregoing circuit model is solidified in the bare machine through form of software, form correlation analysis system;
Step 3: with the relevant parameter input correlation analysis system of circuit model, the superpotential short-circuit risks analysis of complete operation.
Further, said power capacitor, reactor series loop close-the sub-switching operation process technology analyzes equivalent-circuit model and comprises substation bus bar three phase mains loop;
Substation bus bar three phase mains 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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.
Further, in the said step 3), the relevant parameter that needs to analyze comprises resistance R ax, reactance Lax, capacitor C ax, the value of resistance R bx, reactance Lbx and capacitor C bx, resistance R cx, reactance Lcx, capacitor C cx, Czo, Cao, Cbo, Cco; The relevant parameter that also comprises substation bus bar three phase mains loop, said relevant parameter are meant and adopt the existing △ type or the relevant parameter of the formed circuit model of wye connection, belong to the common practise category.
The invention has the beneficial effects as follows:
The present invention is through network analysis; Discovery period be present in electrical network in and the existence of the parasitic capacitance ignored by people for a long time (also in couples certainly or distributed capacitance) be to cause one of technical reason that electric power system capacitor loops circuit breaker bursts; And propose to comprise original papers such as power distribution network power supply, parasitic capacitance, circuit breaker at interior circuit model with this; Method of the present invention through the utilization circuit model can direct technology, analyze, simulate 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 series reactor problem place from 1～12% parameter configuration, and proposed evasion tactics with this; For eliminating the low rule factor loop of distribution (power capacitor, reactor compensation) operating accident new approaches and methods is provided, for reliable basis is established in the safe operation that improves electrical network.
Other advantages of the present invention, target and characteristic will be set forth in specification subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following specification and claims.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is a circuit model structural representation of the present invention;
Fig. 2 connects sketch map for the present invention adopts the substation bus bar three phase mains loop of delta connection.
Embodiment
Below will carry out detailed description to the preferred embodiments of the present invention with reference to accompanying drawing.Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
The present invention proposes a kind of association analysis method that utilizes capacitor-reactor series loop parasitic parameter, assessing for the short-circuit risks of transformer station provides a kind of good method of operation.With the 10KV of transformer station bus is example, and this method may further comprise the steps:
Step 1: set up power capacitor, reactor series loop to close-the sub-switching operation process technology analyzes equivalent-circuit model; As shown in the figure; Said power capacitor, reactor series loop close-and the sub-switching operation process technology analyzes equivalent-circuit model and comprises substation bus bar three phase mains loop, and substation bus bar three phase mains 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 mains 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 mains 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;
Step 2: the foregoing circuit model is solidified in the bare machine through form of software, form correlation analysis system;
Step 3: the relevant parameter input correlation analysis system that will analyze, the superpotential short-circuit risks analysis of complete operation.Wherein, Relevant parameter comprises Ran, reactance Lan, power supply Ua, capacitor C yao, resistance R bn, reactance Lbn, power supply Ub, capacitor C ybo, resistance R cn, reactance Lcn, the power supply Uc among the figure;, capacitor C yco (above parameter when adopting the △ type to connect method; If employing wye connection; Then carry out value according to the parameter of wye connection), resistance R ax, reactance Lax, capacitor C ax, the value of resistance R bx, reactance Lbx and capacitor C bx, resistance R cx, reactance Lcx, capacitor C cx, Czo, Cao, Cbo, Cco is through bringing this circuit model into; Can obtain the correlation circumstance of parasitic parameter; Analyze the current/voltage regularity of distribution in breaker mechanical motion process and the electric process, thereby calculate, analyze the power distribution network condenser capacity, thereby judge the risk factor that is short-circuited from 1000～12000KVAR, the series reactor problem place from 1～12% parameter configuration.
The present invention overcome the technological prejudice of existing monitoring technology, fully realized the harm that parasitic 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 method safely and efficiently is provided.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; 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 present invention.
Claims (3)
1.
SharpUsed the association analysis method of capacitor-reactor series loop parasitic parameter, it is characterized in that: said method comprising the steps of:
Step 1: set up power capacitor, reactor series loop to close-the sub-switching operation process technology analyzes equivalent-circuit model, comprised parasitic loop in the model;
Step 2: the foregoing circuit model is solidified in the bare machine through form of software, form correlation analysis system;
Step 3: with the relevant parameter input correlation analysis system of circuit model, the superpotential short-circuit risks analysis of complete operation.
2. the association analysis method that utilizes capacitor-reactor series loop parasitic parameter according to claim 1 is characterized in that: and said power capacitor, reactor series loop close-and the sub-switching operation process technology analyzes equivalent-circuit model and comprises substation bus bar three phase mains loop;
Substation bus bar three phase mains 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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 circuit breaker 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.
3. the association analysis method that utilizes capacitor-reactor series loop parasitic parameter according to claim 2; It is characterized in that: in the said step 3); The relevant parameter that needs to analyze comprises resistance R ax, reactance Lax, capacitor C ax, the value of resistance R bx, reactance Lbx and capacitor C bx, resistance R cx, reactance Lcx, capacitor C cx, Czo, Cao, Cbo, Cco; The relevant parameter that also comprises substation bus bar three phase mains loop.
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| CN201110450575XA CN102437574B (en) | 2011-12-29 | 2011-12-29 | Association analysis method using parasitic parameters of capacitor-reactor series circuit |
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| CN201110450575XA CN102437574B (en) | 2011-12-29 | 2011-12-29 | Association analysis method using parasitic parameters of capacitor-reactor series circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070156358A1 (en) * | 2005-12-30 | 2007-07-05 | Abb Technology Ltd. | Method and device for fault location on three terminal power line |
| CN201576070U (en) * | 2009-12-25 | 2010-09-08 | 上海希明电气技术有限公司 | Integrated monitoring device for monitoring parasitic loops in DC system of transformer station |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070156358A1 (en) * | 2005-12-30 | 2007-07-05 | Abb Technology Ltd. | Method and device for fault location on three terminal power line |
| CN201576070U (en) * | 2009-12-25 | 2010-09-08 | 上海希明电气技术有限公司 | Integrated monitoring device for monitoring parasitic loops in DC system of transformer station |
Non-Patent Citations (1)
| Title |
|---|
| 康鸿飞等: "串抗耦合对10kV并联电容器组合闸暂态的影响分析", 《重庆电力高等专科学校学报》 * |
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Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121205 |
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Effective date of registration: 20121205 Address after: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Applicant after: Qinan Power Supply Bureau of Chongqing Power Co. Applicant after: State Grid Corporation of China Address before: Shuanglong road 401420 Chongqing city Qijiang County Gunan town No. 51 Applicant before: Qinan Power Supply Bureau of Chongqing Power Co. |
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