CN106093769B - A kind of analysis method of arc-extinguishing chamber of circuit breaker electric life - Google Patents
A kind of analysis method of arc-extinguishing chamber of circuit breaker electric life Download PDFInfo
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- CN106093769B CN106093769B CN201610503378.2A CN201610503378A CN106093769B CN 106093769 B CN106093769 B CN 106093769B CN 201610503378 A CN201610503378 A CN 201610503378A CN 106093769 B CN106093769 B CN 106093769B
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- extinguishing chamber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- Arc-Extinguishing Devices That Are Switches (AREA)
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Abstract
The invention discloses a kind of analysis methods of arc-extinguishing chamber of circuit breaker electric life, the following steps are included: in the operating process of arc-extinguishing chamber of circuit breaker bearing load or fault current, the prebreakdown current waveform in arc-extinguishing chamber of circuit breaker making process and the drop-out current waveform during arcing time and separating brake and arcing time are monitored and record, to determine the energy indexes in switch closing and switch opening operating process；The ablation state for determining arc-extinguishing chamber of circuit breaker key position is analyzed according to energy indexes, and then flow field characteristic index is determined according to ablation state analysis；Finally, passing through the comparison of flow field characteristic index and given threshold value, so that the electric life to arc-extinguishing chamber of circuit breaker is analyzed.
Description
Technical field:
The present invention relates to the analysis of arc-extinguishing chamber of circuit breaker electric life and evaluation areas, a kind of point of arc-extinguishing chamber of circuit breaker electric life
Analysis method.
Background technique:
Breaker plays control and protective effect as a kind of power transmission and transforming equipment in power grid, it is in the power system not
It can or lack.With the raising of voltage class, the status of breaker is also more crucial.The reliability of breaker, to whole system
Stability is particularly important.
Breaker generally carries the short circuit current of system in its action process, and during short circuit interruption, electric arc
Extinguishing be breaker top priority.The ablation of electric arc will cause the permanent damage of critical component in arc-chutes, to influence
To the service life of breaker itself, when ablation is serious, the disabler of breaker may cause, bring to electric system very big
Harm, the electric life of arc-extinguishing chamber of circuit breaker has become an important research content in breaker use process.
In view of the above problems, current research is generally concentrated at two aspects, it is on the one hand to improve critical component in arc-chutes
Resistance to ablation ability and arc-chutes itself arc-rupturing capacity, from design end solve the problems, such as this；It on the other hand is according to breaker
Experimental data and actual operating data assess the remaining electric life of breaker, solve the problems, such as this from operation end.
For current arc-extinguishing chamber of circuit breaker electric life assessment technology, characterized mostly using contact head abrasive loss.Touching
Head abrasion loss is evaluated with drop-out current summation, or is evaluated with the variation degree of arc loop contact resistance.This few class assessment side
Case is often limited to the tip type of arc-chutes, and the practical arcing time of breaker in the process of running can not accurately calculate, only
Electric life situation of the arc-extinguishing chamber of circuit breaker in type approval test can be combined roughly, provide the relative surplus amount an of electric life.
As it can be seen that the analysis and assessment of arc-extinguishing chamber of circuit breaker electric life, temporarily not the shadow of arc-chutes fracture key components and parts
The factor of sound takes into account, if it is possible to consider arc-extinguishing chamber of circuit breaker design data, and rise in conjunction with experimental data and operation data
Come, then the analysis and the accuracy of assessment and the stability of assessment result of existing arc-extinguishing chamber of circuit breaker electric life can be improved.
Summary of the invention:
The purpose of the present invention is to provide a kind of analysis method of high-voltage breaker explosion chamber electric life, this method will be used for
In the assessment of high-voltage circuitbreaker service life, fully taking into account to cut-off with breaker has the typical component index of correlation directly contacted,
Improve the precision and stability of existing life assessment method.
In order to achieve the above objectives, the present invention adopts the following technical scheme that realize:
A kind of analysis method of arc-extinguishing chamber of circuit breaker electric life, comprising the following steps:
1) it in the operating process of arc-extinguishing chamber of circuit breaker bearing load or fault current, monitors and records arc-extinguishing chamber of circuit breaker
Prebreakdown current waveform and arcing time T in making processmakeWith during separating brake drop-out current waveform and the arcing time
Topen, to determine the energy indexes Q in switch closing and switch opening operating process；
2) it according to the current waveform and arcing time data in the operating process of the arc-extinguishing chamber of circuit breaker, analyzes and obtains
To the ablation state of arc-extinguishing chamber of circuit breaker key position, ablation state is by the variation of spout critical size parameter M come quantitatively characterizing；
3) it according to the ablation state of the arc-extinguishing chamber of circuit breaker, the i.e. variation of spout critical size parameter M, analyzes and obtains
Obtain the flow field characteristic index B of spout specific position；
It 4) is to sentence with given threshold value C according to the flow field characteristic index B of the spout specific position of the arc-extinguishing chamber of circuit breaker
Calibration is quasi-, and analysis obtains the electric life situation of arc-extinguishing chamber of circuit breaker, wherein flow field characteristic index B breaks closer to given threshold value C
The remaining life of road device arc-chutes electric life is fewer.
A further improvement of the present invention lies in that the drop-out current during prebreakdown current and separating brake in making process,
Characterizes and analyzed with virtual value I；Energy indexes Q in the operation of arc-extinguishing chamber of circuit breaker switch closing and switch opening is with Q=I2× t table
Sign, the energy indexes Q are obtained by actual measurement, and form the first discrete parameter collection Q { Q1, Q2... ..., Qn}；Wherein, virtual value I is
The drop-out current during prebreakdown current and separating brake in making process；For making process, t represents prebreakdown arc current
Duration；For separating brake process, t represents the arc current duration in interrupting process.
A further improvement of the present invention lies in that the variation of spout critical size parameter is characterized with percents, by testing
Mode obtains, and the measured value of spout critical size parameter forms the second discrete parameter collection M { M1, M2... ..., Mn}；First is discrete
Parameter set Q { Q1, Q2... ..., QnAnd the second discrete parameter collection M { M1, M2... ..., MnIn discrete parameter correspond.
A further improvement of the present invention lies in that the second discrete parameter collection M { M1, M2... ..., MnAnd the first discrete ginseng
Manifold Q { Q1, Q2... ..., QnBetween mathematical relationship by first function M=f (Q) quantitative description.
A further improvement of the present invention lies in that the quantitative expression of first function M=f (Q) is based on probability analysis
Two discrete parameter collection M { M1, M2... ..., MnAnd the first discrete parameter collection Q { Q1, Q2... ..., QnBetween numerical fitting relationship
Formula.
A further improvement of the present invention lies in that flow field characteristic index is the flow velocity or flow parameter of spout specific position, institute
Stating flow field characteristic index can be by surveying or emulating acquisition, and forms third discrete parameter collection B { B1, B2... ..., Bn}；Third from
Dissipate parameter set B { B1, B2... ..., BnAnd the second discrete parameter collection M { M1, M2... ..., MnIn discrete parameter correspond.
A further improvement of the present invention lies in that the second discrete parameter collection M { M1, M2... ..., MnAnd the discrete ginseng of third
Manifold B { B1, B2... ..., BnBetween mathematical relationship by second function B=g (M) quantitative description.
A further improvement of the present invention lies in that the quantitative expression of second function B=g (M) is based on probability analysis
Three discrete parameter collection B { B1, B2... ..., BnAnd the second discrete parameter collection M { M1, M2... ..., MnBetween numerical fitting relationship
Formula.
A further improvement of the present invention lies in that the flow field that threshold value C is set as the spout specific position of arc-extinguishing chamber of circuit breaker is special
Property index B0Percentage.
Compared with the existing technology, the present invention has the advantage that:
1, in the present invention, evaluation index introduces the jet size parameter and flow field parameter two fingers of arc-extinguishing chamber of circuit breaker
Mark, evaluation index more horn of plenty；
2, using transmission function mode, the correspondence model of circuit breaker electric parameter and physical parameter is established, so that input and output
Relationship is clear, and characterizing method is more direct effective；
3, it realizes the comparison of breaker experiment and result data and design value, improves what circuit breaker electrical endurance analysed and evaluated
Accuracy is conducive to preferably assess breaker remaining life in the O&M stage.
Detailed description of the invention:
Fig. 1 is arc-chutes spout schematic diagram of the present invention；
Fig. 2 is implementation flow chart of the present invention.
Specific embodiment:
The invention will be described in further detail with reference to the accompanying drawing:
As shown in Figure 1, for the signal of arc-extinguishing chamber of circuit breaker main injection jet model described in the embodiment of the present invention.Select spout certain bits
Size is set as critical evaluation parameter, evaluates required discrete manifold M { M to constitute1, M2... ..., Mn}。
The selection of the location parameter is different because of structure design and evaluation needs, can be selected from specific position, can also
Multiple position construction parameters are selected, each parameter is assessed respectively, to determine the most weak factor for influencing electric life.
It is illustrated for convenience, the present embodiment selects arc-chutes spout key position diameter d as single evaluation parameter.
Diameter d calibration range: the diameter value in Fig. 1 in I~II section of dotted line confining spectrum, on the normal plane of any position.
The specific implementation method for carrying out the assessment of arc-chutes electric life using method provided by the present invention is as follows:
Step S101: setting electric life analyses and evaluates threshold value C, which selects arc-chutes spout specific position initial
Flow field characteristic index B0Percentage, the selection of specific position is as shown in Figure 1.
It should be noted that the selection of the position can be different with structure design and evaluation needs.
It monitors and records the prebreakdown current waveform and arcing time T during breaker closingmake。
Step S102: it monitors and records the arc current waveform and arcing time T during breaker open operationopen。
Step S103: utilize Q=I2× t calculates separately the arc energy during circuit-breaker switching on-off, determines energy indexes
Q forms the first discrete manifold Q { Q1, Q2... ..., Qn }.
Step S104: as shown in Figure 1, the ablation situation of analysis spout, measures spout key position size d, record and conduct
Size Evaluation parameter forms the second discrete manifold M { M1, M2... ..., Mn}。
It should be noted that the discrete parameter that the first discrete manifold and the second dispersion number are concentrated corresponds respectively, first
Transmission function is denoted as M=f (Q).
Step S105: according to spout key position ablation situation, emulate and site-test analysis its flow field characteristic, formed third from
Dissipate manifold B { B1, B2... ..., Bn, and one-to-one relationship is formed with the second discrete manifold, the second transmission function is denoted as B=g
(M)。
Step S106: according to threshold value C, state evaluation is carried out for function B, judges the electric life state of arc-chutes.If manifold
B{B1, B2... ..., BnDiscrete parameter and C value very close to or the mathematical distribution of function B level off to C, that, which can consider, goes out
Arc chamber ablation degree is serious, the deterioration of electric life state.
Furthermore, due to the coupling of the first transmission function and the second transmission function, which can make electricity
Arc energy and flow field characteristic connect each other, realize the diversification of status assessment, can be obtained by transfer function analysis flow field index and
The direct mathematical relationship of ablation index, so that evaluation result is more intuitive and reliable.
The implementation of the embodiments of the present invention has the following beneficial effects:
In embodiments of the present invention, evaluation index introduces the jet size parameter and flow field parameter two of arc-extinguishing chamber of circuit breaker
A index realizes the comparison of breaker experiment and result data and design value, to improve breaker using transmission function mode
The accuracy that electric life analyses and evaluates, is conducive to preferably assess breaker remaining life in the O&M stage.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (7)
1. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life, which comprises the following steps:
1) it in the operating process of arc-extinguishing chamber of circuit breaker bearing load or fault current, monitors and records arc-extinguishing chamber of circuit breaker combined floodgate
Prebreakdown current waveform and arcing time T in the processmakeWith the drop-out current waveform and arcing time T during separating brakeopen,
To determine the energy indexes Q in switch closing and switch opening operating process；It is specific as follows:
The drop-out current during prebreakdown current and separating brake in making process, is characterized and is analyzed with virtual value I；It is disconnected
Energy indexes Q in the operation of road device arc-chutes switch closing and switch opening is with Q=I2× t characterization, the energy indexes Q are obtained by actual measurement,
And form the first discrete parameter collection Q { Q1, Q2... ..., Qn}；Wherein, virtual value I for the prebreakdown current in making process and divides
Drop-out current during lock；For making process, t represents the prebreakdown arc current duration；For separating brake process, t generation
The arc current duration in table interrupting process；
2) it according to the current waveform and arcing time data in the operating process of the arc-extinguishing chamber of circuit breaker, analyzes and is broken
The ablation state of road device arc-chutes key position, ablation state is by the variation of spout critical size parameter M come quantitatively characterizing；Its
In, the variation of spout critical size parameter is characterized with percents, is obtained by experiment method, the reality of spout critical size parameter
It surveys numerical value and forms the second discrete parameter collection M { M1, M2... ..., Mn}；First discrete parameter collection Q { Q1, Q2... ..., QnAnd second from
Dissipate parameter set M { M1, M2... ..., MnIn discrete parameter correspond；
3) it according to the ablation state of the arc-extinguishing chamber of circuit breaker, the i.e. variation of spout critical size parameter M, analyzes and is sprayed
The flow field characteristic index B of mouth specific position；
It 4) is to determine mark with given threshold value C according to the flow field characteristic index B of the spout specific position of the arc-extinguishing chamber of circuit breaker
Standard, analysis obtain the electric life situation of arc-extinguishing chamber of circuit breaker, wherein flow field characteristic index B is closer to given threshold value C, breaker
The remaining life of arc-chutes electric life is fewer.
2. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 1, which is characterized in that described second
Discrete parameter collection M { M1, M2... ..., MnAnd the first discrete parameter collection Q { Q1, Q2... ..., QnBetween mathematical relationship by first
Function M=f (Q) quantitative description.
3. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 2, which is characterized in that first function
The quantitative expression of M=f (Q) is the second discrete parameter collection M { M based on probability analysis1, M2... ..., MnAnd the first discrete ginseng
Manifold Q { Q1, Q2... ..., QnBetween numerical fitting relational expression.
4. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 1, which is characterized in that flow field characteristic
Index is the flow velocity or flow parameter of spout specific position, and the flow field characteristic index can be by surveying or emulating acquisition, and shape
At third discrete parameter collection B { B1, B2... ..., Bn}；Third discrete parameter collection B { B1, B2... ..., BnAnd the second discrete parameter collection
M{M1, M2... ..., MnIn discrete parameter correspond.
5. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 4, which is characterized in that described second
Discrete parameter collection M { M1, M2... ..., MnAnd third discrete parameter collection B { B1, B2... ..., BnBetween mathematical relationship by second
Function B=g (M) quantitative description.
6. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 5, which is characterized in that second function
The quantitative expression of B=g (M) is the third discrete parameter collection B { B based on probability analysis1, B2... ..., BnAnd the second discrete ginseng
Manifold M { M1, M2... ..., MnBetween numerical fitting relational expression.
7. a kind of analysis method of arc-extinguishing chamber of circuit breaker electric life according to claim 1, which is characterized in that threshold value C is set
It is set to the flow field characteristic index B of the spout specific position of arc-extinguishing chamber of circuit breaker0Percentage.
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| US10332698B2 (en) * | 2016-12-21 | 2019-06-25 | Eaton Intelligent Power Limited | System and method for monitoring contact life of a circuit interrupter |
| CN107192941B (en) * | 2017-05-03 | 2021-02-05 | 广州供电局有限公司 | Analysis method and management method for dynamic load capacity of circuit breaker |
| CN109633423B (en) * | 2018-11-14 | 2020-09-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Circuit breaker spout ablation state evaluation system |
| CN111220641A (en) * | 2019-11-21 | 2020-06-02 | 河南平高电气股份有限公司 | Ablation resistance detection device, detection method and evaluation method for arc extinguishing nozzle |
| CN111505496B (en) * | 2020-05-08 | 2021-02-02 | 西安交通大学 | Vacuum circuit breaker electric service life evaluation method based on arc energy |
| CN111933459A (en) * | 2020-07-20 | 2020-11-13 | 西安热工研究院有限公司 | Method for detecting electrical wear state of breaker contact by utilizing arc power |
| CN114372379B (en) * | 2022-01-19 | 2024-02-02 | 西安交通大学 | Method, device and equipment for evaluating electrical life of contact of mechanical direct current breaker |
| CN115526540B (en) * | 2022-10-28 | 2024-02-23 | 苏州西门子电器有限公司 | Method and device for evaluating electric life, computer readable medium and electronic equipment |
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