CN105182268A - Method and device for monitoring operating state of capacitor voltage transformer - Google Patents

Method and device for monitoring operating state of capacitor voltage transformer Download PDF

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Publication number
CN105182268A
CN105182268A CN201410234857.XA CN201410234857A CN105182268A CN 105182268 A CN105182268 A CN 105182268A CN 201410234857 A CN201410234857 A CN 201410234857A CN 105182268 A CN105182268 A CN 105182268A
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CN
China
Prior art keywords
voltage
phase
potential transformer
obtains
phase voltage
Prior art date
Application number
CN201410234857.XA
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Chinese (zh)
Inventor
李艳鹏
马丽强
俞华
王志鹏
刘永鑫
高鹏
Original Assignee
国网山西省电力公司电力科学研究院
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Application filed by 国网山西省电力公司电力科学研究院 filed Critical 国网山西省电力公司电力科学研究院
Priority to CN201410234857.XA priority Critical patent/CN105182268A/en
Publication of CN105182268A publication Critical patent/CN105182268A/en

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Abstract

The invention discloses a method and device for monitoring the operating state of a capacitor voltage transformer, and the device comprises a three-phase voltage collector, a filter, a voltage comparator, and an alarm module, wherein the three-phase voltage collector, the filter, the voltage comparator and the alarm module are connected sequentially. The three-phase voltage collector is connected with a secondary side of the capacitor voltage transformer, and obtains a three-phase voltage from the secondary side of the capacitor voltage transformer. The filter obtains the three-phase voltage, and obtains a three-phase fundamental wave voltage according to the three-phase voltage. The voltage comparator obtains the three-phase fundamental wave voltage, and obtains the difference between effective values of any two phase voltages according to the three-phase fundamental wave voltage. The alarm module obtains the difference between effective values of any two phase voltages. If the difference between effective values of any two phase voltages is greater than a preset threshold value, the state of the corresponding capacitor voltage transformer is abnormal, and the change rate of a secondary voltage is obtained. The capacitance change rate is determined according to the change rate of the secondary voltage, and the breakdown number of capacitors is determined.

Description

Capacitance type potential transformer method for monitoring operation states and device
Technical field
The present invention relates to power domain, particularly relate to a kind of capacitance type potential transformer method for monitoring operation states and device.
Background technology
Capacitance type potential transformer is the voltage conversion device of current electric system widespread use, and high-voltage variable is changed to low-voltage for measurement and protection by it.In electric system in operational process, if breakdown accident appears in capacitance type potential transformer electric capacity, bring hidden danger can to the safe and reliable operation of electrical network.
At present to the method mainly infrared imaging diagnosis of capacitance type potential transformer condition diagnosing, but infrared imaging diagnosis is subject to the impact of heat transfer path insensitive to defect qualitative due to the focus detected, and easily causes wrong diagnosis.
Summary of the invention
The invention provides a kind of capacitance type potential transformer method for monitoring operation states and device, can realize the reliable early warning of capacitance type potential transformer defect.
The embodiment of the present invention adopts following technical scheme:
A kind of capacitance type potential transformer method for monitoring operation states, comprising:
Detect the secondary side voltage of threephase potential transformer, obtain three-phase voltage effective value;
Determine the difference of three-phase voltage effective value;
If the difference of three-phase voltage effective value is greater than pre-set threshold value, then determines corresponding capacitance type potential transformer abnormal state, and obtain secondary voltage rate of change, according to secondary voltage rate of change determination rate of change of capacitance, determine that electric capacity punctures quantity.
Optionally, described pre-set threshold value defining method is, when capacitance type potential transformer capacitance change is 1%, calculate secondary voltage rate of change, rate of change is multiplied with secondary voltage and obtains pre-set threshold value.
A kind of capacitance type potential transformer monitoring running state device, comprising: the three-phase voltage collector, wave filter, voltage comparator, the alarm module that connect successively;
Three-phase voltage collector connects capacitance type potential transformer secondary side, obtains three-phase voltage from capacitance type potential transformer secondary side;
Wave filter obtains three-phase voltage, obtains three-phase fundamental voltage according to three-phase voltage;
Voltage comparator obtains three-phase fundamental voltage, must take office the difference of two-phase voltage effective value according to three-phase fundamental voltage;
Alarm module obtains the difference of appointing two-phase voltage effective value, if appoint the difference existing in the difference of two-phase voltage effective value and reach pre-set threshold value, then reports to the police.
Based on technique scheme, the embodiment of the present invention is for the threephase potential transformer run, the secondary side of threephase potential transformer can be obtained three-phase voltage effective value, by calculating the difference of three-phase voltage effective value, the difference of three-phase voltage effective value exceedes threshold values, then determine corresponding capacitance type potential transformer abnormal state, and can according to secondary voltage rate of change determination rate of change of capacitance, and then obtain electric capacity and puncture quantity, thus capacitance type potential transformer state is assessed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the capacitance type potential transformer method for monitoring operation states of the embodiment of the present invention;
Fig. 2 is that the 500kV capacitance type potential transformer capacitor cell of the embodiment of the present invention punctures the relation schematic diagram counted with secondary voltage rate of change, rate of change of capacitance;
The structural representation of the capacitance type potential transformer monitoring running state device that Fig. 3 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of capacitance type potential transformer method for monitoring operation states, comprising:
11, detect the secondary side voltage of threephase potential transformer, obtain three-phase voltage effective value;
12, the difference of three-phase voltage effective value is determined;
If the difference of 13 three-phase voltage effective values is greater than pre-set threshold value, then determines corresponding capacitance type potential transformer abnormal state, and obtain secondary voltage rate of change, according to secondary voltage rate of change determination rate of change of capacitance, determine that electric capacity punctures quantity.
Described pre-set threshold value defining method is, when capacitance type potential transformer capacitance change is 1%, calculate secondary voltage rate of change, rate of change is multiplied with secondary voltage and obtains pre-set threshold value.
Particularly, the embodiment of the present invention, for the threephase potential transformer run, can obtain three-phase voltage effective value Ua from the secondary side of threephase potential transformer, Ub, Uc, by calculating the difference U1=Ua-Ub of three-phase voltage effective value, U2=Ub-Uc, U3=Uc-Ua, if U1, U2 and U3 exceed the threshold values of regulation, then provide the early warning of corresponding capacitance type potential transformer abnormal state, and according to secondary voltage rate of change determination rate of change of capacitance, and then obtain electric capacity and puncture quantity.
Such as, for 500kV capacitance type potential transformer, by each elementary cell electric capacity identical calculations, high-voltage capacitance C1 is when puncturing a capacitor cell, and electric capacity increases 0.228%, and secondary voltage raises 0.217%; When puncturing 5 unit, electric capacity increases 1.14%, and secondary voltage raises 1.116%, and main Secondary Winding value can be elevated to 58.38V from 57.74V, and difference is 0.64.So when monitoring from secondary voltage, when magnitude of voltage raises 0.6V, just should arouse attention.Therefore, determine that pre-set threshold value is 0.6V.Certainly, determine according to pre-set threshold value defining method in other embodiments of the invention.
Fig. 2 is that 500kV capacitance type potential transformer capacitor cell punctures the relation schematic diagram counted with secondary voltage rate of change, rate of change of capacitance.
The embodiment of the present invention is for the threephase potential transformer run, three-phase voltage effective value can be obtained from the secondary side of threephase potential transformer, by calculating the difference of three-phase voltage effective value, the difference of three-phase voltage effective value exceedes threshold values, then determine the early warning of corresponding capacitance type potential transformer abnormal state, and according to secondary voltage rate of change determination rate of change of capacitance, and then obtain electric capacity and puncture quantity.
As shown in Figure 3, the embodiment of the present invention provides a kind of capacitance type potential transformer monitoring running state device, comprising: the three-phase voltage collector 1 connected successively, wave filter 2, voltage comparator 3, alarm module 4;
Three-phase voltage collector 1 connects capacitance type potential transformer secondary side, obtains three-phase voltage from capacitance type potential transformer secondary side;
Wave filter 2 obtains three-phase voltage, obtains three-phase fundamental voltage according to three-phase voltage;
Voltage comparator 3 obtains three-phase fundamental voltage, must take office the difference of two-phase voltage effective value according to three-phase fundamental voltage;
Alarm module 4 obtains the difference of appointing two-phase voltage effective value, if appoint the difference existing in the difference of two-phase voltage effective value and reach pre-set threshold value, then reports to the police.
Wherein, pre-set threshold value is 0.6V.
Particularly, three-phase voltage collector 1, wave filter 2, voltage comparator 3 and alarm module 4, three-phase voltage collector 1 obtains three-phase voltage from capacitance type potential transformer secondary side, three-phase voltage is device 2 after filtering, obtain three-phase fundamental voltage, input voltage comparer 3 must take office the difference of two-phase voltage effective value, and by three the voltage difference input warning devices 4 obtained, any one voltage difference reaches the threshold value then trigger alarm of setting.
The embodiment of the present invention is for the threephase potential transformer run, three-phase voltage effective value can be obtained from the secondary side of threephase potential transformer, by calculating the difference of three-phase voltage effective value, the difference of three-phase voltage effective value exceedes threshold values, determine corresponding capacitance type potential transformer abnormal state, and can according to secondary voltage rate of change determination rate of change of capacitance, and then obtain electric capacity and puncture quantity, assessment is made to capacitance type potential transformer state.
Those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (3)

1. a capacitance type potential transformer method for monitoring operation states, is characterized in that, comprising:
Detect the secondary side voltage of threephase potential transformer, obtain three-phase voltage effective value;
Determine the difference of three-phase voltage effective value;
If the difference of three-phase voltage effective value is greater than pre-set threshold value, then determines corresponding capacitance type potential transformer abnormal state, and obtain secondary voltage rate of change, according to secondary voltage rate of change determination rate of change of capacitance, determine that electric capacity punctures quantity.
2. method according to claim 1, is characterized in that, described pre-set threshold value defining method is, when capacitance type potential transformer capacitance change is 1%, calculate secondary voltage rate of change, rate of change is multiplied with secondary voltage and obtains pre-set threshold value.
3. a capacitance type potential transformer monitoring running state device, is characterized in that, comprising: the three-phase voltage collector, wave filter, voltage comparator, the alarm module that connect successively;
Three-phase voltage collector connects capacitance type potential transformer secondary side, obtains three-phase voltage from capacitance type potential transformer secondary side;
Wave filter obtains three-phase voltage, obtains three-phase fundamental voltage according to three-phase voltage;
Voltage comparator obtains three-phase fundamental voltage, must take office the difference of two-phase voltage effective value according to three-phase fundamental voltage;
Alarm module obtains the difference of appointing two-phase voltage effective value, if appoint the difference existing in the difference of two-phase voltage effective value and reach pre-set threshold value, then reports to the police.
CN201410234857.XA 2014-05-29 2014-05-29 Method and device for monitoring operating state of capacitor voltage transformer CN105182268A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105548943A (en) * 2016-01-25 2016-05-04 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitor online monitoring method based on CVT secondary voltage monitoring
CN106990380A (en) * 2017-05-31 2017-07-28 国网河南省电力公司平顶山供电公司 Live capacitance type potential transformer fault detection method
CN107607764A (en) * 2017-05-17 2018-01-19 广东电网有限责任公司佛山供电局 A kind of multichannel capacitance type potential transformer real-time detection method and device
CN111208396A (en) * 2020-02-19 2020-05-29 中国南方电网有限责任公司超高压输电公司柳州局 Method for detecting capacitance breakdown number of capacitance voltage transformer

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CN202886456U (en) * 2012-09-17 2013-04-17 浙江省电力公司电力科学研究院 Capacitor voltage transformer fault monitoring instrument
CN103454517A (en) * 2013-06-26 2013-12-18 广东电网公司佛山供电局 Method for online monitoring capacitive voltage transformers
CN203396935U (en) * 2013-07-08 2014-01-15 广东电网公司佛山供电局 Fault simulation test device for capacitance type potential transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1023658A (en) * 1996-07-02 1998-01-23 Nichicon Corp Fault-detecting device for three-phase capacitor
JP2002296313A (en) * 2001-03-30 2002-10-09 Takamisawa Cybernetics Co Ltd Capacitor-testing device
CN1786721A (en) * 2005-11-11 2006-06-14 四川电力试验研究院 On line detecting system with double Y connection wire power capacitor set
CN101620262A (en) * 2009-06-29 2010-01-06 江苏省电力公司苏州供电公司 Fault monitoring method of operating capacitive voltage transformer
CN202886456U (en) * 2012-09-17 2013-04-17 浙江省电力公司电力科学研究院 Capacitor voltage transformer fault monitoring instrument
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CN203396935U (en) * 2013-07-08 2014-01-15 广东电网公司佛山供电局 Fault simulation test device for capacitance type potential transformer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105548943A (en) * 2016-01-25 2016-05-04 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitor online monitoring method based on CVT secondary voltage monitoring
CN105548943B (en) * 2016-01-25 2018-06-19 中国南方电网有限责任公司超高压输电公司梧州局 A kind of CVT capacitance on-line monitoring methods based on the monitoring of CVT secondary voltages
CN107607764A (en) * 2017-05-17 2018-01-19 广东电网有限责任公司佛山供电局 A kind of multichannel capacitance type potential transformer real-time detection method and device
CN106990380A (en) * 2017-05-31 2017-07-28 国网河南省电力公司平顶山供电公司 Live capacitance type potential transformer fault detection method
CN111208396A (en) * 2020-02-19 2020-05-29 中国南方电网有限责任公司超高压输电公司柳州局 Method for detecting capacitance breakdown number of capacitance voltage transformer

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Application publication date: 20151223