CN103293388A - Method for monitoring capacitance values of parallel capacitors in online manner - Google Patents
Method for monitoring capacitance values of parallel capacitors in online manner Download PDFInfo
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- CN103293388A CN103293388A CN2013101822653A CN201310182265A CN103293388A CN 103293388 A CN103293388 A CN 103293388A CN 2013101822653 A CN2013101822653 A CN 2013101822653A CN 201310182265 A CN201310182265 A CN 201310182265A CN 103293388 A CN103293388 A CN 103293388A
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Abstract
The invention relates to a method for monitoring capacitance values of parallel capacitors in an online manner. The method includes that a discharge coil and a current mutual inductance coil are respectively connected to two ends of each capacitor in three phases of a parallel capacitor bank in parallel, each discharge coil is connected with a voltage data preprocessing unit, each current mutual inductance coil is connected with a current data preprocessing unit, the voltage data preprocessing unit and the current data preprocessing units are respectively connected with a data processing unit, and a logic signal acquisition module, an encoder, a data importing module and a single chip microcomputer are arranged in the data processing unit. The method has the advantages that the capacitance values of the parallel capacitor bank are tested in real time in the online manner without changing the structure of equipment of a power grid or increasing extra measuring equipment, particularly, voltages at two ends of each capacitor are acquired in a normal running procedure of the parallel capacitor bank by the aid of secondary windings of the discharge coils, currents of the capacitors are acquired from current mutual inductors, and accordingly the capacitance values of the capacitor bank can be tested and computed in real time in the online manner.
Description
Technical field
The invention belongs to dynamo-electric checkout equipment monitoring equipment field, especially a kind of shnt capacitor capacitance on-line monitoring method.
Background technology
The capacitance of high-voltage parallel capacitor is the key index of reflection capacitor equipment state, the damage of the inner respective capacitances element of shnt capacitor can cause other elements to bear superpotential and punch through damage, and the damage meeting of internal capacitance element reflects in the condenser capacitance value.Measured capacitance value is the routine test project of capacitor at present, needs to have a power failure to carry out, and the cycle is longer, can not monitor in real time; Under many circumstances, owing to can not in time find shnt capacitor internal capacitance component breakdown situation, shnt capacitor is with regard to owing to the internal capacitance component breakdown breaks down before the test that has a power failure.
Some shnt capacitor online test method are also arranged at present, and the subject matter that these methods exist has: one, need to increase extra measuring equipment or change the mode of connection and electric network composition; Two, the accuracy of on-line testing, when utilizing busbar voltage and current data to calculate capacitance, need with the series reactance value in the Shunt Capacitor Unit circuit and resistance value as known quantity substitution find the solution, be subject to the influence of reactance and resistance parameter accuracy and data sampling precision, the accuracy of electric capacitance measurement test result is not high; Three, can not test the actual value of Shunt Capacitor Unit electric capacity; shnt capacitor on-line monitoring method based on differential voltage; be subjected to the restriction of shnt capacitor structure; can only be applied to the Shunt Capacitor Unit of differential voltage protection; and this method is based upon on the symmetrical fully basis of Shunt Capacitor Unit three-phase; test accuracy is limited, and can only detect the relative variation of capacitor group electric capacity.
By retrieval, find one piece of patent documentation relevant with the present patent application content, publication number is that the Chinese patent of 202903892U discloses a kind of transformer station's electric capacity on-Line Monitor Device based on wireless mode, the main composition: install the self-powered current measuring unit additional in the design of the high-pressure side of every electric capacity, install self-powered voltage measurement unit additional at each secondary side output terminal of organizing the discharge PT of shunt capacitance; The built-in computing machine of monitoring base station and wireless module: send capacitance voltage, electric current synchronized sampling startup conversion command, receive measurement data and storage administration, utilize spectrum analysis to calculate electric capacity and the dielectric loss of every electric capacity, result of calculation is sent to the remote monitoring center monitoring host computer and carries out the comprehensive assessment analysis, to the capacitor proposition fault warning of variable quantity greater than certain value.
Through contrast, this patent and the application have more different.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, a kind of simple in structure, reasonable in design, shnt capacitor capacitance on-line testing method of being easy to calculate is provided.
The technical solution used in the present invention is:
A kind of shnt capacitor capacitance on-line monitoring method the steps include:
⑴ Shunt Capacitor Unit circuit arranges:
Each capacitor two ends in the Shunt Capacitor Unit three-phase respectively and be connected to discharge coil and electric current mutual inductor, each discharge coil is connected to a voltage data pretreatment unit, each electric current mutual inductor connects a current data pretreatment unit respectively, the voltage data pretreatment unit is connected with a data processing unit respectively with the current data pretreatment unit, and this data processing unit is built-in with logical signal acquisition module, scrambler, data importing module, single-chip microcomputer;
⑵ obtaining of capacitor group both end voltage amount:
Above-mentioned each discharge coil is provided with Secondary Winding, with this discharge coil as voltage transformer (VT), obtain the voltage data at each phase capacitor two ends of Shunt Capacitor Unit by the Secondary Winding of discharge coil, voltage data is carried out filtering, sampling, analog to digital conversion and calculate the voltage value at each phase capacitance two ends by the voltage data pretreatment unit;
⑶ obtaining of the capacitor group magnitude of current:
The electric current of capacitor group each current transformer from the Shunt Capacitor Unit three-phase respectively obtains, at present, usually be provided with the secondary terminal that current transformer connects in the switch cubicle of capacitor group, in order to directly obtain the capacitor electrode flow data, this current data carried out filtering, sampling, analog to digital conversion by the current data pretreatment unit to current data and calculate the current values at each phase capacitance two ends;
⑷ the calculating of capacitance value:
The data importing module of data processing and control unit is connected with voltage data pretreatment unit, current data pretreatment unit respectively, and single-chip microcomputer carries out real-time testing and the calculating of condenser capacity according to capacitor voltage at both ends data and current data.
And described voltage data pretreatment unit and current data pretreatment unit are built-in with power supply, A/D conversion microprocessor and transport module respectively.
And, the auxiliary contact place is provided with sensor in the described Shunt Capacitor Unit position of the switch, this sensor links to each other by lead with data processing unit, after sensor is transferred to logical signal acquisition module in the data processing unit with logical signal, this logical signal is encoded by the scrambler in the data processing unit, the preset value of corresponding on off state amount when memory built-in has shnt capacitor out of service in the data processing unit, the preset value of the on off state amount in the logical signal behind the coding and this data processing unit, when being judged to be Shunt Capacitor Unit when out of service, Online Transaction Processing should the interrupt voltage data and the obtaining of current data, and stop the described capacitance value of step ⑷ and calculate.
And, also be equipped with storer and data in the described data processing unit and derive module, the capacitance that described single-chip microcomputer will obtain after will calculating is transferred in the storer, is connected with data on the storer and derives module, and this data derivation module is followed with external units such as industrial computer or data storage mediums and is connected.
Advantage of the present invention and good effect are:
1, the present invention is not changing the grid equipment structure and is increasing on the basis of extra measuring equipment, realized the real-time in-line testing to the Shunt Capacitor Unit capacitance, especially, the present invention has utilized the monitoring function of discharge coil Secondary Winding to voltage, in the Shunt Capacitor Unit normal course of operation, obtain the voltage at capacitor two ends, and obtain condenser current from current transformer, utilize the electric current and voltage data to realize real-time in-line testing and calculating to capacitor group electric capacity.
2, the present invention does not need additionally to increase equipment when voltage and current value are obtained in the shnt capacitor circuit in monitoring, test result accuracy height, in addition, can pass through data processing unit and manually-operated interface to storage and the query function of condenser capacitance value historical data, can damage Shunt Capacitor Unit internal capacitance component breakdown and carry out early warning.
Description of drawings
The logic diagram that Fig. 1 obtains and handles for data of the present invention;
The logic diagram that Fig. 2 connects for each unit of monitoring part, electrical equipment among the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and by specific embodiment, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of shnt capacitor capacitance on-line monitoring method referring to Fig. 1, the steps include:
⑴ Shunt Capacitor Unit circuit arranges:
Requirement according to the shnt capacitor design specifications, each capacitor two ends in the Shunt Capacitor Unit three-phase respectively and be connected to discharge coil and electric current mutual inductor, each discharge coil is connected to a voltage data pretreatment unit, each electric current mutual inductor connects a current data pretreatment unit respectively, the voltage data pretreatment unit is connected with a data processing unit respectively with the current data pretreatment unit, and this data processing unit is built-in with logical signal acquisition module, scrambler, data importing module, single-chip microcomputer, storer and data and derives module;
⑵ obtaining of capacitor group both end voltage amount:
Above-mentioned each discharge coil is provided with Secondary Winding, with this discharge coil as voltage transformer (VT), obtain the voltage data at each phase capacitor two ends of Shunt Capacitor Unit by the Secondary Winding of discharge coil, voltage data is carried out filtering, sampling, analog to digital conversion and calculate the voltage value at each phase capacitance two ends by the voltage data pretreatment unit, this voltage data pretreatment unit is built-in with power supply, A/D conversion microprocessor and transport module;
⑶ obtaining of the capacitor group magnitude of current:
The electric current of capacitor group each current transformer from the Shunt Capacitor Unit three-phase respectively obtains, at present, usually be provided with the secondary terminal that current transformer connects in the switch cubicle of capacitor group, in order to directly obtain the capacitor electrode flow data, this current data carried out filtering, sampling, analog to digital conversion by the current data pretreatment unit to current data and calculate the current values at each phase capacitance two ends, this current data pretreatment unit is built-in with power supply, A/D conversion microprocessor and transport module;
⑷ obtaining of on off state amount:
The auxiliary contact place is provided with sensor in the Shunt Capacitor Unit position of the switch, this sensor links to each other by lead with data processing unit, after sensor is transferred to logical signal acquisition module in the data processing unit with logical signal, this logical signal is encoded by the scrambler in the data processing unit, the preset value of corresponding on off state amount when memory built-in has shnt capacitor out of service in the data processing unit, the preset value of the on off state amount in the logical signal behind the coding and this data processing unit, when being judged to be Shunt Capacitor Unit when out of service, Online Transaction Processing should the interrupt voltage data and the obtaining of current data, and stop test and calculate;
⑸ the calculating of capacitance value:
The data importing module of data processing and control unit is connected with voltage data pretreatment unit, current data pretreatment unit respectively, single-chip microcomputer carries out the real-time testing of condenser capacity according on off state amount and capacitor voltage at both ends data and current data, and the calculation procedure of condenser capacity is as follows:
1. the calculating of correction coefficient:
Because discharge coil and current transformer have its progress of disease characteristic, in order more accurately to record the numerical value of condenser capacity, need proofread and correct the voltage and current that obtains capacitor, be the convenience that says something, be example with single-phase, the method for correction following (supposing that correction coefficient is r+jk):
In shnt capacitor commissioning test and routine test, record the accurate initial value C of condenser capacity
0, the acquisition methods with above-mentioned capacitor group both end voltage amount and the magnitude of current after capacitor puts into operation obtains voltage vector
And current vector
, then have,
By
,
，
Can calculate the mould value of correction coefficient according to following formula, this mould value is stored, use in order to subsequent calculations.
2. set online test period:
Setting voltage, current data sampling and the time interval of calculating, set comparatively reasonably time step according to the performance of data processing equipment with to the time requirement of electric capacity capacitance value data.In the sampling period, finish the calculating to the obtaining of voltage and current data, processing and power frequency vector;
2. capacity in line computation:
The correction coefficient that calculates is stored as calculating parameter, according to the relation between capacitor group both end voltage and the electric current | I|=wC|U|| (r+jk) |
⑹ storage, inquiry and the early warning of capacity measurement value:
The capacitance that single-chip microcomputer will obtain after will calculating is transferred in the storer, and connecting data on the storer derives module, and this data derivation module is followed with external units such as industrial computer or data storage mediums and is connected, and is convenient to the inquiry of capacitance thus.
In the present embodiment, the industrial computer that data derivation module and has human-computer interaction interface connects, can inquire about historical data and the variation tendency of the calculating of electric capacity by human-computer interaction interface thus, set Shunt Capacitor Unit electric capacity alarm threshold by industrial computer simultaneously, the correction coefficient of Online Transaction Processing is safeguarded.
Claims (4)
1. a shnt capacitor capacitance on-line monitoring method is characterized in that: the steps include:
⑴ Shunt Capacitor Unit circuit arranges:
Each capacitor two ends in the Shunt Capacitor Unit three-phase respectively and be connected to discharge coil and electric current mutual inductor, each discharge coil is connected to a voltage data pretreatment unit, each electric current mutual inductor connects a current data pretreatment unit respectively, the voltage data pretreatment unit is connected with a data processing unit respectively with the current data pretreatment unit, and this data processing unit is built-in with logical signal acquisition module, scrambler, data importing module, single-chip microcomputer;
⑵ obtaining of capacitor group both end voltage amount:
Above-mentioned each discharge coil is provided with Secondary Winding, with this discharge coil as voltage transformer (VT), obtain the voltage data at each phase capacitor two ends of Shunt Capacitor Unit by the Secondary Winding of discharge coil, voltage data is carried out filtering, sampling, analog to digital conversion and calculate the voltage value at each phase capacitance two ends by the voltage data pretreatment unit;
⑶ obtaining of the capacitor group magnitude of current:
The electric current of capacitor group each current transformer from the Shunt Capacitor Unit three-phase respectively obtains, at present, usually be provided with the secondary terminal that current transformer connects in the switch cubicle of capacitor group, in order to directly obtain the capacitor electrode flow data, this current data carried out filtering, sampling, analog to digital conversion by the current data pretreatment unit to current data and calculate the current values at each phase capacitance two ends;
⑷ the calculating of capacitance value:
The data importing module of data processing and control unit is connected with voltage data pretreatment unit, current data pretreatment unit respectively, and single-chip microcomputer carries out real-time testing and the calculating of condenser capacity according to capacitor voltage at both ends data and current data.
2. shnt capacitor capacitance on-line monitoring method according to claim 1 is characterized in that: described voltage data pretreatment unit and current data pretreatment unit are built-in with power supply, A/D conversion microprocessor and transport module respectively.
3. shnt capacitor capacitance on-line monitoring method according to claim 1, it is characterized in that: the auxiliary contact place is provided with sensor in the described Shunt Capacitor Unit position of the switch, this sensor links to each other by lead with data processing unit, after sensor is transferred to logical signal acquisition module in the data processing unit with logical signal, this logical signal is encoded by the scrambler in the data processing unit, the preset value of corresponding on off state amount when memory built-in has shnt capacitor out of service in the data processing unit, the preset value of the on off state amount in the logical signal behind the coding and this data processing unit, when being judged to be Shunt Capacitor Unit when out of service, Online Transaction Processing should the interrupt voltage data and the obtaining of current data, and stop the described capacitance value of step ⑷ and calculate.
4. shnt capacitor capacitance on-line monitoring method according to claim 1, it is characterized in that: also be equipped with storer and data in the described data processing unit and derive module, the capacitance that described single-chip microcomputer will obtain after will calculating is transferred in the storer, be connected with data on the storer and derive module, this data derivation module is followed with external units such as industrial computer or data storage mediums and is connected.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155900A (en) * | 2014-08-07 | 2014-11-19 | 安徽富煌电控设备有限公司 | Capacitor on-line monitoring control device for high pressure power distribution system |
| CN104569615A (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | Capacitor bank fault detection system |
| CN108594022A (en) * | 2018-05-25 | 2018-09-28 | 杭州得诚电力科技股份有限公司 | A kind of intelligent capacitor automatization test system and method |
| CN109406883A (en) * | 2018-12-27 | 2019-03-01 | 日新电机（无锡）有限公司 | A kind of Assembled high-voltage shunted capacitor device and power equipment |
| CN109449887A (en) * | 2018-10-26 | 2019-03-08 | 杭州沃伦森电气有限公司 | Capacitor group branch impedance performance monitoring systems |
| CN110675003A (en) * | 2019-10-11 | 2020-01-10 | 浙江南德电气有限公司 | Intelligent capacitor early warning method and early warning system thereof |
| CN110829384A (en) * | 2019-10-31 | 2020-02-21 | 西安欣东源电气有限公司 | Parallel capacitor protection method |
| CN111509733A (en) * | 2020-04-28 | 2020-08-07 | 安徽航睿电子科技有限公司 | Modularized capacitance capacity expansion system |
| RU2734541C1 (en) * | 2020-04-16 | 2020-10-20 | Общество с ограниченной ответственностью "Уральский завод новых технологий" | Communication capacitors state monitoring system |
| RU2734542C1 (en) * | 2020-04-16 | 2020-10-20 | Общество с ограниченной ответственностью "Уральский завод новых технологий" | Communication capacitors state monitoring system |
| CN112748273A (en) * | 2020-12-29 | 2021-05-04 | 广东电网有限责任公司电力科学研究院 | Real-time voltage monitoring circuit for discharge coil of high-voltage parallel capacitor bank |
| CN115980458A (en) * | 2023-03-21 | 2023-04-18 | 广东电网有限责任公司广州供电局 | Method, device, system, equipment and medium for detecting capacity of platform area capacitor |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104155900A (en) * | 2014-08-07 | 2014-11-19 | 安徽富煌电控设备有限公司 | Capacitor on-line monitoring control device for high pressure power distribution system |
| CN104569615A (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | Capacitor bank fault detection system |
| CN108594022A (en) * | 2018-05-25 | 2018-09-28 | 杭州得诚电力科技股份有限公司 | A kind of intelligent capacitor automatization test system and method |
| CN109449887A (en) * | 2018-10-26 | 2019-03-08 | 杭州沃伦森电气有限公司 | Capacitor group branch impedance performance monitoring systems |
| CN109406883A (en) * | 2018-12-27 | 2019-03-01 | 日新电机（无锡）有限公司 | A kind of Assembled high-voltage shunted capacitor device and power equipment |
| CN110675003B (en) * | 2019-10-11 | 2022-08-23 | 浙江南德电气有限公司 | Intelligent capacitor early warning method and early warning system thereof |
| CN110675003A (en) * | 2019-10-11 | 2020-01-10 | 浙江南德电气有限公司 | Intelligent capacitor early warning method and early warning system thereof |
| CN110829384A (en) * | 2019-10-31 | 2020-02-21 | 西安欣东源电气有限公司 | Parallel capacitor protection method |
| RU2734541C1 (en) * | 2020-04-16 | 2020-10-20 | Общество с ограниченной ответственностью "Уральский завод новых технологий" | Communication capacitors state monitoring system |
| RU2734542C1 (en) * | 2020-04-16 | 2020-10-20 | Общество с ограниченной ответственностью "Уральский завод новых технологий" | Communication capacitors state monitoring system |
| CN111509733B (en) * | 2020-04-28 | 2021-09-17 | 安徽航睿电子科技有限公司 | Modularized capacitance capacity expansion system |
| CN111509733A (en) * | 2020-04-28 | 2020-08-07 | 安徽航睿电子科技有限公司 | Modularized capacitance capacity expansion system |
| CN112748273A (en) * | 2020-12-29 | 2021-05-04 | 广东电网有限责任公司电力科学研究院 | Real-time voltage monitoring circuit for discharge coil of high-voltage parallel capacitor bank |
| CN115980458A (en) * | 2023-03-21 | 2023-04-18 | 广东电网有限责任公司广州供电局 | Method, device, system, equipment and medium for detecting capacity of platform area capacitor |
| CN115980458B (en) * | 2023-03-21 | 2023-08-25 | 广东电网有限责任公司广州供电局 | Method, device, system, equipment and medium for detecting capacity of capacitor in transformer area |
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Application publication date: 20130911 |