CN115541973A - Method and device for monitoring signal redundancy of high-voltage bus of transformer substation - Google Patents

Method and device for monitoring signal redundancy of high-voltage bus of transformer substation Download PDF

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CN115541973A
CN115541973A CN202211524485.5A CN202211524485A CN115541973A CN 115541973 A CN115541973 A CN 115541973A CN 202211524485 A CN202211524485 A CN 202211524485A CN 115541973 A CN115541973 A CN 115541973A
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redundancy
voltage
transformer
sequence
monitoring
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CN115541973B (en
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汤博
赵言涛
刘宇轩
徐虎
王建忠
刘名成
汪龙峰
汪攀
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Wasion Group Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/02—Measuring effective values, i.e. root-mean-square values
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention discloses a method for monitoring signal redundancy of a high-voltage bus of a transformer substation, which comprises the following steps of: synchronously acquiring secondary side voltage signals of all transformers in the transformer substation, and calculating effective values of the secondary side voltage signals of the transformers; calculating the difference value of effective values between any two transformer sampling channels according to the effective values of the secondary side voltage signals of the transformers to obtain a voltage difference value time sequence; calculating a deviation accumulation index of the voltage difference time sequence; and calculating a redundancy confidence index corresponding to the voltage difference value time sequence according to the deviation accumulation index, and judging the redundancy among the sampling channels of the mutual inductor to obtain a redundancy matrix among the sampling channels of the mutual inductor. The invention also discloses a device for monitoring the signal redundancy of the high-voltage bus of the transformer substation. The invention solves the technical problem of accurately and quickly detecting the signal redundancy of the high-voltage bus of the transformer substation and outputting the result.

Description

Method and device for monitoring signal redundancy of high-voltage bus of transformer substation
Technical Field
The invention relates to the technical field of power system monitoring, in particular to a method and a device for monitoring signal redundancy of a high-voltage bus of a transformer substation.
Background
While power transformers, especially Capacitive Voltage Transformers (CVTs), are widely used in power grid systems, the current power transformers have low operating error stability, and are very prone to have an out-of-tolerance phenomenon in the actual operating process, that is, the error level exceeds the normal level. With continuous progress of metering technology and innovation of management modes, requirements for online monitoring and state evaluation of power transformers are increasingly enhanced, and how to extract abnormal quantities from redundant information of power transformer clusters in a transformer substation is a key for online monitoring and state evaluation of the transformers.
Disclosure of Invention
The invention mainly aims to provide a method and a device for monitoring signal redundancy of a high-voltage bus of a transformer substation, and solves the technical problem of accurately and quickly detecting the signal redundancy of the high-voltage bus of the transformer substation and outputting a result.
In order to achieve the purpose, the invention provides a method for monitoring signal redundancy of a high-voltage bus of a transformer substation, wherein the method comprises the following steps of:
s1, synchronously acquiring secondary side voltage signals of all transformers in a transformer substation, and calculating effective values of the secondary side voltage signals of the transformers;
s2, calculating the difference value of effective values between any two transformer sampling channels according to the effective values of the voltage signals of the secondary sides of the transformers to obtain a voltage difference value time sequence;
s3, solving a deviation accumulation index of the voltage difference time sequence;
and S4, calculating a redundancy confidence index corresponding to the voltage difference value time sequence according to the deviation accumulation index, and judging the redundancy among the sampling channels of the mutual inductor to obtain a redundancy matrix among the sampling channels of the mutual inductor.
In one preferable embodiment, the effective value of the secondary side voltage signal of the transformer calculated in step S1 is:
Figure 431848DEST_PATH_IMAGE001
wherein U is an effective value of the voltage signal, U is the voltage signal,
Figure 370986DEST_PATH_IMAGE002
is the nth sampling moment, and N is the number of sampling points.
In a preferred embodiment, the step S2 of calculating the difference between the sampling channels of the transformers is as follows:
Figure 507569DEST_PATH_IMAGE003
wherein C is the difference between channels in the transformer cluster, m is the number of the channels of each transformer, and m is more than or equal to 2.
In one preferred embodiment, the step S3 of calculating the deviation accumulation indicator of the voltage difference time series includes the specific steps of:
s31, calculating the mean value of the voltage difference time sequence;
s32, calculating to obtain a deviation accumulation sequence according to the mean value of the voltage difference time sequence;
and S33, obtaining a deviation accumulation index according to the deviation accumulation sequence.
In one preferable embodiment, the step S31 of calculating the mean value of the time series of voltage difference values is:
Figure 707606DEST_PATH_IMAGE004
wherein the content of the first and second substances,
Figure 874539DEST_PATH_IMAGE005
in the form of a time series of voltage difference values,
Figure 300972DEST_PATH_IMAGE006
is the ith data point and n is the total number of data points.
In a preferred embodiment, the accumulated sequence of deviations is:
Figure 569142DEST_PATH_IMAGE007
wherein the content of the first and second substances,
Figure 499052DEST_PATH_IMAGE008
=0，
Figure 725634DEST_PATH_IMAGE009
is a sequence of accumulated deviations.
In a preferred embodiment, the cumulative index of deviation:
Figure 108205DEST_PATH_IMAGE010
wherein the content of the first and second substances,
Figure 180066DEST_PATH_IMAGE011
in order to be an index of accumulated deviation,
Figure 994176DEST_PATH_IMAGE012
is the maximum value of the cumulative sequence of deviations,
Figure 1446DEST_PATH_IMAGE013
is the minimum of the cumulative sequence of deviations.
In one preferred embodiment, the redundancy judgment between sampling channels of each transformer in step S4 specifically includes:
if the redundancy confidence index is smaller than a first threshold value, judging that a transformer sampling channel corresponding to the current voltage difference value is in a redundancy state;
and if the redundancy confidence index is larger than a first threshold, judging that the transformer sampling channel corresponding to the current voltage difference value is in a normal state.
The invention provides a device for monitoring signal redundancy of a high-voltage bus of a transformer substation, which comprises a storage unit and a processing unit, wherein a computer program which can run on the processing unit is stored in the storage unit; when the processing unit executes the computer program, the method for monitoring the signal redundancy of the high-voltage bus of the transformer substation is realized.
In the technical scheme of the invention, the method for monitoring the signal redundancy of the high-voltage bus of the transformer substation comprises the following steps: synchronously acquiring secondary side voltage signals of all transformers in the transformer substation, and calculating effective values of the secondary side voltage signals of the transformers; calculating the difference value of effective values between any two transformer sampling channels according to the effective values of the secondary side voltage signals of the transformers to obtain a voltage difference value time sequence; calculating a deviation accumulation index of the voltage difference time sequence; and calculating a redundancy confidence index corresponding to the voltage difference value time sequence according to the deviation accumulation index, and performing redundancy judgment among the transformer sampling channels to obtain a redundancy matrix among the transformer sampling channels. The invention solves the technical problem of accurately and quickly detecting the signal redundancy of the high-voltage bus of the transformer substation and outputting the result.
In the invention, the effective value sequence is obtained by collecting the voltage signal of the secondary side of each transformer and performing data conversion, and the sampling difference value of the secondary side voltage of the transformer is obtained according to the effective value, so that the reduction of redundancy caused by the offset of a small offset signal can be effectively monitored, and the sensitivity is high; and judging the redundancy among sampling channels of the mutual inductors according to the redundancy confidence index to obtain a redundancy matrix among the channels of the current mutual inductor, so as to extract abnormal quantity from the redundancy information of the mutual inductor cluster in the transformer substation and monitor the signal redundancy of the high-voltage bus.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a first flow chart of a method for monitoring signal redundancy of a high-voltage bus of a substation according to an embodiment of the present invention;
fig. 2 is a second process schematic diagram of a method for monitoring signal redundancy of a high-voltage bus of a substation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sequence of effective values of a secondary side voltage signal of a transformer according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a difference data sequence between every two sampling channels of a transformer according to an embodiment of the present invention;
FIG. 5 is a diagram of an offset accumulation sequence according to an embodiment of the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination of the technical solutions should not be considered to exist, and is not within the protection scope claimed by the present invention.
Example 1:
referring to fig. 1-2, according to an aspect of the present invention, the present invention provides a method for monitoring signal redundancy of a high voltage bus of a substation, wherein the method comprises the following steps:
s1, synchronously acquiring secondary side voltage signals of all transformers in a transformer substation, and calculating effective values of the secondary side voltage signals of the transformers;
s2, calculating the difference of effective values between sampling channels of any two transformers according to the effective values of the voltage signals of the secondary sides of the transformers to obtain a voltage difference time sequence;
s3, solving a deviation accumulation index of the voltage difference time sequence;
and S4, calculating a redundancy confidence index corresponding to the voltage difference time sequence according to the deviation accumulation index, and judging the redundancy among the sampling channels of the mutual inductor to obtain a redundancy matrix among the sampling channels of the mutual inductor.
Specifically, in this embodiment, the effective value of the secondary side voltage signal of the transformer calculated in step S1 is:
Figure 261526DEST_PATH_IMAGE014
wherein U is an effective value of the voltage signal, U is the voltage signal,
Figure 746866DEST_PATH_IMAGE015
at the nth sampling moment, N is the number of sampling points;
as shown in fig. 3, a is a sequence of effective values of a secondary side voltage signal of any one transformer, and b is a sequence of effective values of a secondary side voltage signal of any another transformer, wherein the ordinate is a voltage value in volts, and the abscissa is a number of the effective values of the voltage signals; in the figure, voltage signals of the transformers in the sections a and b are signal scenes before and after the line switching of the transformer substation, wherein the redundancy of signals between the transformer channels in the first half part is high, and signals between the channels become irrelevant due to the line adjustment switching in the second half part.
Specifically, in this embodiment, the difference between the effective values of any two transformer sampling channels calculated in step S2 is:
Figure 776001DEST_PATH_IMAGE016
wherein C is the difference between channels in the transformer cluster, m is the number of each transformer channel, and m is more than or equal to 2;
randomly selecting two transformers, randomly selecting an effective value of a voltage signal from sampling channels of the two transformers for difference, and sequentially traversing difference value information of the sampling channels of all the transformers to obtain a voltage difference value time sequence; as shown in fig. 4, the effective values in the sampling channels of any two transformers are subtracted to obtain a difference data sequence of the two channels, where the ordinate is a voltage value, the unit is volt, and the abscissa is a difference data number.
Specifically, in this embodiment, the step S3 of obtaining the deviation accumulation index of the voltage difference time series specifically includes the following steps:
s31, calculating the mean value of the voltage difference time sequence; the mean value is:
Figure 688594DEST_PATH_IMAGE017
wherein the content of the first and second substances,
Figure 435970DEST_PATH_IMAGE018
in the form of a time series of voltage difference values,
Figure 480325DEST_PATH_IMAGE019
is the ith data point, and n is the total number of data points;
s32, calculating to obtain a deviation accumulation sequence according to the mean value of the voltage difference time sequence, wherein the deviation accumulation sequence is shown in figure 5; the deviation accumulation sequence is as follows:
Figure 239334DEST_PATH_IMAGE020
wherein, the first and the second end of the pipe are connected with each other,
Figure 713040DEST_PATH_IMAGE021
=0，
Figure 823079DEST_PATH_IMAGE022
in order to accumulate the sequence of deviations, it is,
Figure 774854DEST_PATH_IMAGE023
accumulating the sequence of the deviations of the first i-1 items;
s33, obtaining a deviation accumulation index according to the deviation accumulation sequence; the deviation accumulation index:
Figure 919528DEST_PATH_IMAGE024
wherein the content of the first and second substances,
Figure 672458DEST_PATH_IMAGE025
in order to be an index of the accumulation of the deviation,
Figure 128847DEST_PATH_IMAGE026
is the maximum value of the cumulative sequence of deviations,
Figure 759680DEST_PATH_IMAGE027
is the minimum of the cumulative sequence of deviations.
Specifically, in this embodiment, the step S4 of calculating a redundancy confidence index corresponding to the voltage difference time series according to the deviation accumulation index specifically includes:
randomly disordering the voltage difference time sequence D to obtain a first sequence
Figure 617914DEST_PATH_IMAGE028
The following steps are sequentially executed:
calculating the first sequence
Figure 574369DEST_PATH_IMAGE028
The first sequence of
Figure 518054DEST_PATH_IMAGE028
The mean value of (A) is:
Figure 686999DEST_PATH_IMAGE029
wherein the content of the first and second substances,
Figure 399740DEST_PATH_IMAGE030
is a first sequence
Figure 28561DEST_PATH_IMAGE031
The (c) th data point of (a),
Figure 334908DEST_PATH_IMAGE032
is a first sequence
Figure 697756DEST_PATH_IMAGE031
The mean value of (a);
according to the first sequence
Figure 140370DEST_PATH_IMAGE031
Calculating to obtain a first sequence
Figure 297682DEST_PATH_IMAGE031
A sequence of accumulated deviations of; the first sequence
Figure 825746DEST_PATH_IMAGE031
The accumulated sequence of deviations of (1) is:
Figure 461127DEST_PATH_IMAGE033
wherein the content of the first and second substances,
Figure 787941DEST_PATH_IMAGE034
=0，
Figure 116154DEST_PATH_IMAGE035
is a first sequence
Figure 397094DEST_PATH_IMAGE036
A sequence of accumulated deviations of;
according to the first sequence
Figure 977111DEST_PATH_IMAGE036
Obtaining a first sequence by accumulating the deviation of the first sequence
Figure 518951DEST_PATH_IMAGE036
The deviation accumulation index of (1); the first sequence
Figure 893431DEST_PATH_IMAGE036
The cumulative index of deviation of (1) is:
Figure 786301DEST_PATH_IMAGE037
wherein the content of the first and second substances,
Figure 140315DEST_PATH_IMAGE038
is a first sequence
Figure 208765DEST_PATH_IMAGE039
The deviation of (a) is accumulated as an index,
Figure 19727DEST_PATH_IMAGE040
is a first sequence
Figure 134313DEST_PATH_IMAGE041
The maximum value of the accumulated sequence of deviations of (c),
Figure 321712DEST_PATH_IMAGE042
is a first sequence
Figure 212045DEST_PATH_IMAGE041
The minimum of the cumulative sequence of deviations;
the redundancy confidence index is:
Figure 52962DEST_PATH_IMAGE043
wherein, degree is a redundancy confidence index, V is the frequency of random disorder of the voltage difference time sequence D, and V is
Figure 795790DEST_PATH_IMAGE044
Is less than or equal to
Figure 380356DEST_PATH_IMAGE045
The number of times of (c).
Specifically, in this embodiment, the redundancy judgment between the sampling channels of each transformer in the step S4 specifically includes:
if the redundancy confidence index degree is smaller than a first threshold value, judging that a transformer sampling channel corresponding to the current voltage difference value is in a redundancy state; if the redundancy confidence index degree is larger than a first threshold value, judging that a transformer sampling channel corresponding to the current voltage difference value is in a normal state; the method has the advantages that the sensitivity is high, and the redundancy reduction caused by small offset signal offset can be effectively monitored; and judging the redundancy among sampling channels of the mutual inductors according to the redundancy confidence index to obtain a redundancy matrix among the channels of the current mutual inductor, so as to extract abnormal quantity from the redundancy information of the mutual inductor cluster in the transformer substation and monitor the signal redundancy of the high-voltage bus.
Example 2:
according to another aspect of the present invention, the present invention provides a device for monitoring signal redundancy of a high voltage bus of a substation, wherein the device comprises: the system comprises a storage unit and a processing unit, wherein a computer program which can run on the processing unit is stored in the storage unit; when the processing unit executes the computer program, the method for monitoring the signal redundancy of the high-voltage bus of the transformer substation is realized.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. A method for monitoring signal redundancy of a high-voltage bus of a transformer substation is characterized by comprising the following steps:
s1, synchronously acquiring secondary side voltage signals of all transformers in a transformer substation, and calculating effective values of the secondary side voltage signals of the transformers;
s2, calculating the difference value of effective values between any two transformer sampling channels according to the effective values of the voltage signals of the secondary sides of the transformers to obtain a voltage difference value time sequence;
s3, solving a deviation accumulation index of the voltage difference time sequence;
and S4, calculating a redundancy confidence index corresponding to the voltage difference value time sequence according to the deviation accumulation index, and judging the redundancy among the sampling channels of the mutual inductor to obtain a redundancy matrix among the sampling channels of the mutual inductor.
2. The method for monitoring the signal redundancy of the high-voltage bus of the substation according to claim 1, wherein the effective value of the secondary side voltage signal of the transformer calculated in the step S1 is as follows:
Figure 890500DEST_PATH_IMAGE001
wherein U is an effective value of the voltage signal, U is the voltage signal,
Figure 167898DEST_PATH_IMAGE002
is the nth sampling moment, and N is the number of sampling points.
3. The method for monitoring the signal redundancy of the high-voltage bus of the transformer substation according to claim 1, wherein the step S2 of calculating the difference between the sampling channels of each transformer is as follows:
Figure 866863DEST_PATH_IMAGE003
wherein C is the difference between the channels in the transformer cluster, m is the number of the channels of each transformer, and m is more than or equal to 2.
4. The method for monitoring the signal redundancy of the high-voltage bus of the transformer substation according to claim 1, wherein the step S3 of calculating the deviation accumulation index of the voltage difference time sequence comprises the following specific steps:
s31, calculating the mean value of the voltage difference time sequence;
s32, calculating to obtain a deviation accumulation sequence according to the mean value of the voltage difference time sequence;
and S33, obtaining a deviation accumulation index according to the deviation accumulation sequence.
5. The method for monitoring the redundancy of the high-voltage bus signals of the substation according to claim 4, wherein the average value of the time series of the voltage difference values calculated in the step S31 is:
Figure 396065DEST_PATH_IMAGE004
wherein the content of the first and second substances,
Figure 621510DEST_PATH_IMAGE005
in the form of a time series of voltage difference values,
Figure 945175DEST_PATH_IMAGE006
is the ith data point and n is the total number of data points.
6. The method for monitoring the signal redundancy of the high-voltage bus of the substation according to claim 5, wherein the deviation accumulation sequence is as follows:
Figure 521650DEST_PATH_IMAGE007
wherein the content of the first and second substances,
Figure 90428DEST_PATH_IMAGE008
=0，
Figure 45745DEST_PATH_IMAGE009
in order to accumulate the sequence of deviations, the sequence,
Figure 930525DEST_PATH_IMAGE010
the sequence is accumulated for the deviations of the first i-1 terms.
7. The method for monitoring the signal redundancy of the high-voltage bus of the substation according to claim 5, wherein the accumulated deviation index is:
Figure 869662DEST_PATH_IMAGE011
wherein, the first and the second end of the pipe are connected with each other,
Figure 209507DEST_PATH_IMAGE012
in order to be an index of the accumulation of the deviation,
Figure 675124DEST_PATH_IMAGE013
is the maximum value of the cumulative sequence of deviations,
Figure 839127DEST_PATH_IMAGE014
is the minimum of the cumulative sequence of deviations.
8. The method for monitoring the signal redundancy of the high-voltage bus of the transformer substation according to claim 1, wherein the redundancy judgment among the sampling channels of each transformer in the step S4 is specifically as follows:
if the redundancy confidence index is smaller than a first threshold value, judging that a transformer sampling channel corresponding to the current voltage difference value is in a redundancy state;
and if the redundancy confidence index is larger than a first threshold, judging that the transformer sampling channel corresponding to the current voltage difference value is in a normal state.
9. The device for monitoring the signal redundancy of the high-voltage bus of the transformer substation is characterized by comprising a storage unit and a processing unit, wherein a computer program which can run on the processing unit is stored in the storage unit; the processing unit, when executing the computer program, implements a method of monitoring redundancy of high voltage bus signals of a substation according to any one of claims 1 to 8.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2370754A1 (en) * 2001-02-15 2002-08-15 Kuhlman Electric Corporation In-service testing of current transformers
US20150333652A1 (en) * 2014-05-13 2015-11-19 Lsis Co., Ltd. Deviation compensation method of potential transformer
CN105698860A (en) * 2015-11-16 2016-06-22 任红霞 Current transformer real-time on-line monitoring device
CN109298230A (en) * 2018-08-13 2019-02-01 北京四方继保自动化股份有限公司 Acquisition device for current transformer
CN111751777A (en) * 2020-06-29 2020-10-09 深圳供电局有限公司 Voltage transformer operation state diagnosis method
CN113702895A (en) * 2021-10-28 2021-11-26 华中科技大学 Online quantitative evaluation method for error state of voltage transformer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2370754A1 (en) * 2001-02-15 2002-08-15 Kuhlman Electric Corporation In-service testing of current transformers
US20150333652A1 (en) * 2014-05-13 2015-11-19 Lsis Co., Ltd. Deviation compensation method of potential transformer
CN105698860A (en) * 2015-11-16 2016-06-22 任红霞 Current transformer real-time on-line monitoring device
CN109298230A (en) * 2018-08-13 2019-02-01 北京四方继保自动化股份有限公司 Acquisition device for current transformer
CN111751777A (en) * 2020-06-29 2020-10-09 深圳供电局有限公司 Voltage transformer operation state diagnosis method
CN113702895A (en) * 2021-10-28 2021-11-26 华中科技大学 Online quantitative evaluation method for error state of voltage transformer

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