CN106646319A - Electronic voltage transformer anomaly identification method based on in-station joint measurement - Google Patents

Electronic voltage transformer anomaly identification method based on in-station joint measurement Download PDF

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Publication number
CN106646319A
CN106646319A CN201610880977.6A CN201610880977A CN106646319A CN 106646319 A CN106646319 A CN 106646319A CN 201610880977 A CN201610880977 A CN 201610880977A CN 106646319 A CN106646319 A CN 106646319A
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China
Prior art keywords
electronic type
voltage transformer
type voltage
time window
mean value
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CN201610880977.6A
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CN106646319B (en
Inventor
杨世海
卢树峰
陈铭明
赵双双
周赣
李志新
陈刚
符旺
徐敏锐
陆子刚
吴桥
尧赣东
王少华
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State Grid Corp of China SGCC
Southeast University
Jiangsu Electric Power Research Institute
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State Grid Corp of China SGCC
Southeast University
Jiangsu Electric Power Research Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/02Testing or calibrating of apparatus covered by the preceding groups of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

The invention discloses an electronic voltage transformer anomaly identification method based on in-station joint measurement. On the premise of not adding any device, the anomaly state of the electronic voltage transformer can be accurately identified, a method support is provided for long-term error stability and reliability evaluation on a digital metering system in a complicated operation environment, and finally, development of the new-generation intelligent substation and the technical progress and popularization and application of the digital metering system are promoted.

Description

Electronic type voltage transformer exception discrimination method based on combined measurement in station
Technical field
The present invention relates to a kind of electronic type voltage transformer exception discrimination method based on combined measurement in station, belongs to numeral Change transformer station's technical field.
Background technology
Intelligent grid is the important directions of China's power network development, and intelligent substation is the important step that intelligent grid is built, It is the strong point of the of paramount importance basic operation parameters collection point of electrical network, management and control execution point and following intelligent grid, its development is built If directly influencing the aggregate level that China's intelligent grid is built.Unify strong intelligent grid according to State Grid Corporation of China's construction China will build 110kV and above intelligent substation 6100 during planning, " 12 ".Digital metering system is intelligent change The important component part in power station, is made up of electronic mutual inductor, combining unit and digitalized electrical energy meter, its stability and reliability Sexual intercourse is to the fair and just of trade settlement.
As the pilot of many intelligent substations puts into operation, existing a large amount of electronic type voltage transformers have been obtained promoting and answered With.Electronic type voltage transformer is the key equipment of digital metering system, and its conversion accuracy, stability are in whole metering system Play a leading role in control errors.But as a result of novel sensor and electronic unit, however it remains following problem:Electronic type Voltage transformer before installation and operation by all kinds of type approval tests, but electronic type voltage transformer under complex environment at the scene Easily affected by extraneous factors such as electromagnetic environment, humiture, vibrations;Electronic type voltage transformer kinematic error is overproof under complex environment Or failure often occurs under the cross action of various external interference sources, cannot be complete only by the method for single loading interference source in short-term Face assessment electronics formula voltage transformer performance, lacks electronic type voltage transformer theoretical modeling and test under various typical interference sources Technical research.Further, since network message of the input of digital electricity meter based on IEC61850 agreements, such as network-impacting, electricity Extremely wait and can all cause large effect to digital electricity meter in source.Therefore, digital metering system is generally deposited in intelligent substation The problems such as accuracy, stability, digital metering system is caused still to be independently used for the trade settlement of electric energy tariff point.Mesh Before, using the redundancy of two sets of system paired runnings of traditional electric power meter and digital metering device in some intelligent substations Design, to same stoichiometric point matching measurement each other, this transition mode significantly increases cost of building a station to two sets of systems, and not Meet the demand for development of intelligent substation.
In sum, the technological progress of the development need digital metering system of New Generation of Intelligent transformer station, intelligent power transformation Stand firm the full on-line operation in Dingan County and digital metering system secular error Stability and dependability it is closely bound up.Digital meter The raising of the secular error stability, reliability and metering confidence level of amount system, contributes to lifting the water of digital metering system It is flat, its digitlization, intellectualized technology advantage is given full play to, it is that technical support is carried out in intelligent grid construction, with huge economy Benefit and social benefit.It would therefore be highly desirable to solve the above problems.
The content of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of electronic type voltage mutual inductance based on combined measurement in station Device exception discrimination method.
In order to achieve the above object, the technical solution adopted in the present invention is:
Based on the electronic type voltage transformer exception discrimination method of combined measurement in station, comprise the following steps,
Step 1, if two alternate being provided with N number of electronic type voltage transformer altogether on the bus of certain electric pressure;
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage;
Step 3, calculates in time window certain, and the characteristic quantity for calculating each electronic type voltage transformer output voltage is put down Average, calculates the mean value and variance of N number of characteristic quantity mean value;
Step 4, contrasts N number of electronic type voltage transformer in time scale, if the spy of certain electronic type voltage transformer There is duration exception compared with remaining electronic type voltage transformer in the amount of levying, then it is assumed that the electronic type voltage transformer may go out It is now abnormal;Otherwise return to step 2.
Electronic type voltage transformer output voltage is centrifugal pump.
In step 2, the characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phase placeWherein, I=1,2 ..., N, UiFor i-th electronic type voltage transformer output voltage virtual value,For i-th electronic type voltage transformer Output voltage phase place.
In step 3, calculating has M common frequency cycle in time window, is calculating in time window, i-th electronic type voltage The mean value of transformer output voltage virtual value isThe mean value of i-th electronic type voltage transformer output voltage phase place isThe mean value and variance of N number of virtual value mean value is respectivelyAnd DU, the mean value of N number of phase average It is respectively with variance
The detailed process of step 4 is,
The scope for defining time scale is T, then exist in T timeIndividual calculating time window;Wherein, M Represent the common frequency cycle in time window;
In T time, each D calculated in time window is observedUWithIf certain is calculated in time window,AndSet up, then in the calculating time window, by i-thεIndividual electronic type voltage Transformer is marked, wherein, iε=max (Ui-XU) orMax is to take max function;
If having more than S in T time to calculate i-th in time windowεIndividual electronic type voltage transformer is labeled, then it is assumed that I-thεThere is duration exception in individual electronic type voltage transformer;
The beneficial effect that the present invention is reached:The present invention being capable of accurate recognition electronics on the premise of without any equipment The abnormality of formula voltage transformer, is digital metering system secular error stability, the reliability under complicated running environment Assessment offer method is supported, it is final promote the development of New Generation of Intelligent transformer station and the technological progress of digital metering system and Popularization and application.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described.Following examples are only used for clearly illustrating the present invention Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, the electronic type voltage transformer exception discrimination method based on combined measurement in station, including following step Suddenly:
Step 1, if two alternate being provided with N number of electronic type voltage transformer altogether on the bus of certain electric pressure.
Here two-phase can be for AB is alternate, BC is alternate or AC is alternate, and electronic type voltage transformer output voltage is discrete Value, acceptable sampled point frequency range is fs=1kHz~4kHz.
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage.
The characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phase placeWherein, i=1, 2 ..., N, UiFor i-th electronic type voltage transformer output voltage virtual value,For i-th electronic type voltage transformer output Voltage-phase.
Step 3, calculates in time window certain, and the characteristic quantity for calculating each electronic type voltage transformer output voltage is put down Average, calculates the mean value and variance of N number of characteristic quantity mean value.
Calculating has M common frequency cycle in time window, the span of M is 50~100, and each calculates time window and includes The sample size for having voltage dispersion value is Ns=fs/50×M;Calculating in time window, i-th electronic type voltage transformer is defeated The mean value for going out voltage effective value isThe mean value of i-th electronic type voltage transformer output voltage phase place isIt is N number of The mean value and variance of virtual value mean value is respectivelyAnd DU, the mean value and variance of N number of phase average Respectively
Step 4, contrasts N number of electronic type voltage transformer in time scale, if the spy of certain electronic type voltage transformer There is duration exception compared with remaining electronic type voltage transformer in the amount of levying, then it is assumed that the electronic type voltage transformer may go out It is now abnormal;Otherwise return to step 2.
Detailed process is as follows:
The scope for defining time scale is T, and unit is the second, then exist in T timeIndividual calculating time window Mouthful;Wherein, M represents the common frequency cycle in time window;
In T time, each D calculated in time window is observedUWithIf certain is calculated in time window,AndSet up, then in the calculating time window, by i-thεIndividual electronic type voltage Transformer is marked, wherein, iε=max (Ui-XU) orMax is to take max function;
If having more than S in T time to calculate i-th in time windowεIndividual electronic type voltage transformer is labeled, then it is assumed that I-thεThere is duration exception in individual electronic type voltage transformer;S is general, and value is
Lift example below and further illustrate said method:
4 electronic type voltage transformers are installed AB is alternate, the sample frequency of electronic type voltage transformer is 2kHz, when Between yardstick scope be T=30min × 60=1800 seconds, in 30min exist 900 calculating time windows, S=450, such as table One and table two reflect the D in 30min respectivelyUWithBoth situations.
D in the 30min of table oneUWithThe first situation
In Table 1,900 in 30min calculate the D in time windowUWithIt is satisfied byThen judge each electronic type voltage transformer normal operation.
D in the 30min of table twoUWithSecond situation
In table two, 200 D calculated in time window are there are aboutUWithMeet Separately there are 700 D calculated in time windowUWithMeet And in each window be labeled be i-thε=2 electronic type voltage transformers, then it is assumed that the electricity Minor voltage transformer is likely to occur exception.
Said method is capable of the abnormal shape of accurate recognition electronic type voltage transformer on the premise of without any equipment State, provides method and supports, finally for the digital metering system secular error stability under complicated running environment, reliability assessment Promote the development of New Generation of Intelligent transformer station and the technological progress and popularization and application of digital metering system.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, on the premise of without departing from the technology of the present invention principle, some improvement and deformation can also be made, these improve and deform Also should be regarded as protection scope of the present invention.

Claims (5)

1. the abnormal discrimination method of electronic type voltage transformer based on combined measurement in station, it is characterised in that:Comprise the following steps,
Step 1, if two alternate being provided with N number of electronic type voltage transformer altogether on the bus of certain electric pressure;
Step 2, the synchronous characteristic quantity for reading N number of electronic type voltage transformer output voltage;
Step 3, calculates in time window certain, and the characteristic quantity for calculating each electronic type voltage transformer output voltage is average Value, calculates the mean value and variance of N number of characteristic quantity mean value;
Step 4, contrasts N number of electronic type voltage transformer in time scale, if the characteristic quantity of certain electronic type voltage transformer Occurs duration exception compared with remaining electronic type voltage transformer, then it is assumed that the electronic type voltage transformer is likely to occur different Often;Otherwise return to step 2.
2. the electronic type voltage transformer exception discrimination method based on combined measurement in station according to claim 1, it is special Levy and be:Electronic type voltage transformer output voltage is centrifugal pump.
3. the electronic type voltage transformer exception discrimination method based on combined measurement in station according to claim 1, it is special Levy and be:In step 2, the characteristic quantity of N number of electronic type voltage transformer output voltage includes virtual value UiAnd phase place
Wherein, i=1,2 ..., N, UiFor i-th electronic type voltage transformer output voltage virtual value,For i-th electronic type electricity Pressure transformer output voltage phase place.
4. the electronic type voltage transformer exception discrimination method based on combined measurement in station according to claim 3, it is special Levy and be:In step 3, calculating has M common frequency cycle in time window, calculating in time window, and i-th electronic type voltage is mutual The mean value of sensor output voltage virtual value isThe mean value of i-th electronic type voltage transformer output voltage phase place isThe mean value and variance of N number of virtual value mean value is respectivelyAnd DU, the mean value of N number of phase average It is respectively with varianceWith
5. the electronic type voltage transformer exception discrimination method based on combined measurement in station according to claim 4, it is special Levy and be:The detailed process of step 4 is,
The scope for defining time scale is T, then exist in T timeIndividual calculating time window;Wherein, when M is represented Between common frequency cycle in window;
In T time, each D calculated in time window is observedUWithIf certain is calculated in time window,AndSet up, then in the calculating time window, by i-thεIndividual electronic type voltage Transformer is marked, wherein, iε=max (Ui-XU) orMax is to take max function;
If having more than S in T time to calculate i-th in time windowεIndividual electronic type voltage transformer is labeled, then it is assumed that i-thε There is duration exception in individual electronic type voltage transformer;
CN201610880977.6A 2016-10-09 2016-10-09 Electronic type voltage transformer exception discrimination method based on combined measurement in standing Active CN106646319B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109116286A (en) * 2018-08-23 2019-01-01 国网福建省电力有限公司 A kind of measurement voltage mutual inductor on-line monitoring method
CN109284933A (en) * 2018-10-09 2019-01-29 国网江苏省电力有限公司电力科学研究院 A kind of electronic mutual inductor status assessing system and method based on mathematical statistics

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CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN104933012A (en) * 2015-05-08 2015-09-23 西南交通大学 Method for online identifying measurement deviation fault for traction substation instrument transformer
CN105785306A (en) * 2015-03-23 2016-07-20 国家电网公司 Voltage transformer on-line group calibration method and apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009186266A (en) * 2008-02-05 2009-08-20 Jfe Steel Corp Fine ground fault detector
CN202948123U (en) * 2012-09-26 2013-05-22 湖北省电力公司电力科学研究院 On-site voltage transformer error active calibrating device
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
JP5638729B1 (en) * 2014-03-12 2014-12-10 三菱電機株式会社 Anomaly diagnosis device for current transformer for Rogowski instrument
CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN105785306A (en) * 2015-03-23 2016-07-20 国家电网公司 Voltage transformer on-line group calibration method and apparatus
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109116286A (en) * 2018-08-23 2019-01-01 国网福建省电力有限公司 A kind of measurement voltage mutual inductor on-line monitoring method
CN109284933A (en) * 2018-10-09 2019-01-29 国网江苏省电力有限公司电力科学研究院 A kind of electronic mutual inductor status assessing system and method based on mathematical statistics

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