CN102879630A - Capacitive voltage transformer failure monitoring instrument - Google Patents
Capacitive voltage transformer failure monitoring instrument Download PDFInfo
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- CN102879630A CN102879630A CN2012103439276A CN201210343927A CN102879630A CN 102879630 A CN102879630 A CN 102879630A CN 2012103439276 A CN2012103439276 A CN 2012103439276A CN 201210343927 A CN201210343927 A CN 201210343927A CN 102879630 A CN102879630 A CN 102879630A
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Abstract
The invention discloses a capacitive voltage transformer failure monitoring instrument, which can acquire the three-phase secondary voltage of a three-phase capacitive voltage transformer, can acquire parameter information to be known by processing and calculating the three-phase secondary voltage, and can judge whether the capacitive voltage transformer is abnormal and fails according to the parameter information. During application, the capacitive voltage transformer failure monitoring instrument provided by the embodiment of the invention is directly connected to power equipment, the conventional power equipment structure is not required to be changed, reference parameters of failure judgment are directly calculated by the output voltage of the capacitive voltage transformer, the parameters are stable and reliable, the operating risk of a power system is reduced, and the reliability of the system is improved.
Description
Technical field
The present invention relates to the capacitance type potential transformer field, in particular, relate to a kind of capacitance type potential transformer malfunction monitoring instrument.
Background technology
Capacitance type potential transformer is a capacitor voltage divider and transformer unshakable in one's determination, mainly is comprised of capacitive divider, primary winding, secondary coil, iron core and insulation.Fig. 1 is the installation connection diagram of capacitance type potential transformer in electrical network, as shown in Figure 1, the mode that capacitance type potential transformer adopts three-phase symmetrical to install in transformer station is usually arranged, different umber of turn on its primary winding and the secondary coil can convert high voltage to low-voltage in the ratio of umber of turn and the Secondary Winding number of turn.Therefore, the electrical equipment with unique texture that capacitance type potential transformer is comprised of capacitive divider and medium voltage electromagnetic unit, have the function of voltage transformer (VT) and two kinds of equipment of power circuit carrier concurrently, be widely used in the transformer station of 110KV and above.
In general, the normal operation of capacitance type potential transformer is the important prerequisite that ensures Power network parameter measureing work.Therefore, also particularly important to the monitoring of condenser type transformation mulual inductor malfunction.In the prior art, the monitoring of capacitance type potential transformer mainly comprises the monitoring of leakage current, body dielectric loss and body electric capacity.But, above-mentioned monitoring to capacitance type potential transformer leakage current, body dielectric loss and body electric capacity, all need monitored signal is drawn from the end shield of power equipment, and then the signal of drawing is analyzed, judge voltage transformer (VT) and whether have fault.Yet realize this process that monitored signal is drawn from end shield, just must change the end shield structure of power equipment.
Can find out in sum, the method of monitoring capacitance type potential transformer need to change the power equipment structure in the prior art, and itself easily is subject to the impact of weather and temperature the on-line monitoring of body dielectric loss and body electric capacity, thereby so that operation risk increases, reliability reduces.
Summary of the invention
In view of this, the invention provides a kind of capacitance type potential transformer malfunction monitoring instrument, because monitoring capacitance type potential transformer fault need to change device structure, and monitored parameter is affected by environment and system's operation risk that cause is high, the problem that reliability is low to overcome in the prior art.
For achieving the above object, the invention provides following technical scheme:
A kind of capacitance type potential transformer malfunction monitoring instrument comprises:
The data acquisition unit of the secondary voltage of each phase of collection three-phase Capacitor voltage transformer (VT);
Be connected with described data acquisition unit, the secondary voltage of processing described each phase obtains any one or a plurality of parameter in three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, judge any or a plurality of preset standard scope that whether exceeds in described three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, and in judged result when being, send the processor of corresponding out-of-limit alarm.
Optionally, described processor comprises:
Calculate the vector difference of the magnitude of voltage on two power leads of described three-phase Capacitor voltage transformer (VT) three-phase opening part, and with first single-chip microcomputer of described vector difference as the three-phase open delta voltage;
Be connected with described the first single-chip microcomputer, judge whether the amplitude of described three-phase open delta voltage exceeds the first comparer of default three-phase open delta voltage scope;
Being connected with described the first comparer, is in the situation that is in the judged result of described the first comparer, sends the first alarm of three-phase opening voltage out-of-limit alarm.
Optionally, described processor comprises:
Calculate the amplitude absolute value differences of any two-phase secondary voltage, and with the secondary voltage amplitude of described difference divided by any phase in described any two-phase, obtain the second singlechip of Voltage unbalance degree;
Be connected with described second singlechip, judge whether described Voltage unbalance degree exceeds the second comparer of default Voltage unbalance degree scope;
Being connected with described the second comparer, is in the situation that is in the judged result of described the second comparer, sends the second alarm of the out-of-limit alarm of Voltage unbalance degree.
Optionally, described processor comprises:
Judge whether the secondary voltage amplitude of any phase exceeds the 3rd comparer of default voltage transformer (VT) amplitude range;
Being connected with described the 3rd comparer, is in the situation that is in the judged result of described the 3rd comparer, sends the 3rd alarm of the out-of-limit alarm of voltage transformer (VT) amplitude.
Optionally, also comprise:
Link to each other with described processor, store the storer of out-of-limit alarm signal and fault category mapping table.
Optionally, also comprise:
Link to each other with described processor, according to the corresponding relation in described out-of-limit alarm signal and the fault category mapping table, find out the fault category corresponding with described out-of-limit alarm signal according to the out-of-limit alarm signal that occurs, and show the display of described fault category.
Optionally, described display is in the described processor situation that the determination result is NO, the display of the normal indication information of output parameter.
Optionally, described data acquisition unit is the four-way data acquisition unit.
Optionally, described alarm is at least a in LED lamp and the hummer.
Via above-mentioned technical scheme as can be known, compared with prior art, the embodiment of the invention discloses a kind of capacitance type potential transformer malfunction monitoring instrument, this instrument can gather the three-phase secondary voltage of three-phase Capacitor voltage transformer (VT), and by the processing calculating to described three-phase secondary voltage, needing to obtain the parameter information of understanding, judge according to described parameter whether capacitance type potential transformer exists unusual and fault at last.The disclosed capacitance type potential transformer trouble-monitoring instrument of the embodiment of the invention is directly connected on the power equipment when using, do not need to change original power equipment structure, and the parameter of fault basis for estimation is directly calculated by the capacitance type potential transformer output voltage, parameter stability is reliable, integral body has reduced the operation risk of electric system, has improved system reliability.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
Fig. 1 is the installation connection diagram of capacitance type potential transformer in electrical network;
Fig. 2 is the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument the first structural representation;
Fig. 3 is the wiring schematic diagram of the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument;
Fig. 4 is disclosed processor the first structural representation of the embodiment of the invention;
Fig. 5 is the process flow diagram of middle calculating three-phase open delta voltage embodiment illustrated in fig. 4 and warning;
Fig. 6 is disclosed processor the second structural representation of the embodiment of the invention;
Fig. 7 is the process flow diagram of middle calculating Voltage unbalance degree embodiment illustrated in fig. 6 and warning;
Fig. 8 is disclosed processor the 3rd structural representation of the embodiment of the invention;
Fig. 9 is the process flow diagram of middle calculating voltage transformer (VT) amplitude embodiment illustrated in fig. 8 and warning;
Figure 10 is the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument the second structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment one
As shown in Figure 1, the mode that the capacitance type potential transformer that is connected with three-phase bus in the present embodiment adopts three-phase symmetrical to install.
Fig. 2 is the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument structure schematic diagram,
Fig. 3 is the wiring schematic diagram of the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument,
Referring to Fig. 2 and shown in Figure 3, described capacitance type potential transformer malfunction monitoring instrument 20 can comprise:
The data acquisition unit 201 of the secondary voltage of each phase of collection three-phase Capacitor voltage transformer (VT).
Referring to shown in Figure 3, in the present embodiment, the three-phase Capacitor voltage transformer (VT) adopts the open-delta method to connect, two pins of A phase capacitance type potential transformer T1 secondary side are a and x, two pins of B phase capacitance type potential transformer T2 secondary side are b and y, two pins of C phase capacitance type potential transformer T3 secondary side are c and z, have 6 pins; The x pin is linked to each other with the b pin, and the y pin linked to each other with the c pin, finally obtain 4 pins, therefore, data acquisition unit in the present embodiment can be the data acquisition unit of four-way, connect respectively above-mentioned 4 pins, a pin output voltage is designated as U1, x-b pin output voltage is designated as U2, c pin output voltage is designated as U3, and z pin output voltage is designated as U4, and then A phase secondary voltage value is the vector difference of U1 and U2, B phase secondary voltage value is the vector difference of U2 and U3, and C phase secondary voltage value is the vector difference of U3 and U4.
Described capacitance type potential transformer trouble-monitoring instrument is except data acquisition unit 201, also comprise with described data acquisition unit and being connected, the secondary voltage of processing described each phase obtains in three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude any or a plurality of parameter, judge any or a plurality of critical field that whether exceeds in described three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, and in judged result when being, send the processor 202 of corresponding out-of-limit alarm.
U1, U2, U3 and U4 that described processor 202 can collect according to 201 4 passages of described data acquisition unit, calculate three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude of three-phase Capacitor voltage transformer (VT), and judge whether it exceeds the preset standard scope; The structure that comprises below in conjunction with described processor 202 is introduced the computing method of three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude of three-phase Capacitor voltage transformer (VT) successively.
Fig. 4 is disclosed processor the first structural representation of the embodiment of the invention, and Fig. 5 is the process flow diagram of middle calculating three-phase open delta voltage embodiment illustrated in fig. 4 and warning, and referring to Fig. 4 and shown in Figure 5, described processor 202 can comprise:
Calculate the vector difference of the magnitude of voltage on two power leads of described three-phase Capacitor voltage transformer (VT) three-phase opening part, and with first single-chip microcomputer 401 of described vector difference as the three-phase open delta voltage.
In the present embodiment, the three-phase open delta voltage be three-phase voltage and, three-phase voltage and computing formula be U0=U1-U2+U2-U3+U3-U4, i.e. U0=U1-U4=U14; Therefore, the value of three-phase open delta voltage equals the vector difference of the magnitude of voltage on two power leads of three-phase Capacitor voltage transformer (VT) three-phase opening part.
Be connected with described the first single-chip microcomputer, judge whether the amplitude of described three-phase open delta voltage surpasses the first comparer 402 of default three-phase open delta voltage scope.
Wherein, described default three-phase open delta voltage scope can arrange according to previous experiences for the operation staff; Under normal circumstances, the scope of three-phase open delta voltage is 1.5-3V.
Being connected with described the first comparer, is in the situation that is in the judged result of described the first comparer, sends the first alarm 403 of three-phase opening voltage out-of-limit alarm.
The three-phase open delta voltage U0 that calculates at described the first single-chip microcomputer 401 has exceeded its normal range, illustrates that there is fault in the three-phase Capacitor voltage transformer (VT), and for example the built-in electrical insulation fault is sent the out-of-limit warning information of three-phase open delta voltage.
Need to prove, the structure of the open processor of the embodiment of the invention is not limited to said structure, in actual applications, described the first single-chip microcomputer and described the first comparer can be concrete structures that synthesizes in one, a single-chip microcomputer that for example has simultaneously calculating and comparing function, certainly, described the first single-chip microcomputer and described the first comparer also can be above-mentioned two separate structures.Processing structure on the basis that does not break away from global design thought of the present invention all should belong to protection scope of the present invention.
Fig. 6 is disclosed processor the second structural representation of the embodiment of the invention, and Fig. 7 is the process flow diagram of middle calculating Voltage unbalance degree embodiment illustrated in fig. 6 and warning, and referring to Fig. 6 and shown in Figure 7, described processor 202 can comprise:
Calculate the amplitude absolute value differences of any two-phase secondary voltage, and with the secondary voltage amplitude of described difference divided by any phase in described any two-phase, obtain the second singlechip 601 of Voltage unbalance degree;
Wherein, arbitrarily two-phase can be A, B phase, also can be B, C phase and A, C mutually, its computing method are similar, introduce its computing method as example at this mutually take A, B.Described second singlechip 601 obtains U1, U2 and U3, at first calculate the phasor difference U12 of U1 and U2, calculate again the phasor difference U23 of U2 and U3, calculate at last the difference of the voltage magnitude absolute value of U12 and U23, the described difference that will calculate again obtains A phase voltage degree of unbalancedness divided by U12; The described difference that calculates divided by U23, is obtained B phase voltage degree of unbalancedness.
Be connected with described second singlechip, judge whether described Voltage unbalance degree exceeds the second comparer 602 of default Voltage unbalance degree scope.
Wherein, described default Voltage unbalance degree scope can arrange according to previous experiences for the operation staff; Under normal circumstances, the scope of Voltage unbalance degree is 3%-5%.
Being connected with described the second comparer, is in the situation that is in the judged result of described the second comparer, sends the second alarm 603 of the out-of-limit alarm of Voltage unbalance degree.
The Voltage unbalance degree that calculates at described second singlechip 601 has exceeded its normal range, illustrates that there is fault in the three-phase Capacitor voltage transformer (VT), sends the out-of-limit warning information of Voltage unbalance degree.Certainly, if described amplitude absolute value differences has surpassed 5% divided by the value that U12 obtains, then send the out-of-limit warning information of A phase voltage degree of unbalancedness; If described amplitude absolute value differences has surpassed 5% divided by the value that U23 obtains, then send the out-of-limit warning information of B phase voltage degree of unbalancedness.
Need to prove, the structure of the open processor of the embodiment of the invention is not limited to said structure, in actual applications, described second singlechip and described the second comparer can be concrete structures that synthesizes in one, a single-chip microcomputer that for example has simultaneously calculating and comparing function, certainly, described second singlechip and described the second comparer also can be above-mentioned two separate structures.Processing structure on the basis that does not break away from global design thought of the present invention all should belong to protection scope of the present invention.
Fig. 8 is disclosed processor the 3rd structural representation of the embodiment of the invention, and Fig. 9 is the process flow diagram of middle calculating voltage transformer (VT) amplitude embodiment illustrated in fig. 8 and warning, and referring to Fig. 8 and shown in Figure 9, described processor 202 can comprise:
Judge whether the secondary voltage amplitude of any phase exceeds the 3rd comparer 801 of default voltage transformer (VT) amplitude range.
Whether the amplitude that needs to judge which phase is during super scope, just choose corresponding secondary voltage output signal, for example, judge when whether B phase secondary voltage amplitude exceeds standard, calculate the vector difference U23 of U2 and U3, the amplitude of U23 and default voltage transformer (VT) amplitude are compared.
Being connected with described the 3rd comparer, is in the situation that is in the judged result of described the 3rd comparer, sends the 3rd alarm 802 of the out-of-limit alarm of voltage transformer (VT) amplitude.
Secondary voltage amplitude at the U23 capacitance type potential transformer has exceeded its normal range, illustrates that there is fault in B phase capacitance type potential transformer, and for example the built-in electrical insulation fault is sent the out-of-limit warning information of B phase voltage mutual inductor amplitude.
Need to prove, the specific implementation of above-mentioned the first alarm, the second alarm and the 3rd alarm can be the LED lamp, also can be hummer, also can be the combination of LED lamp and hummer; The alerting signal of different parameters can be arranged to the LED lamp of different colours and/or the sound of different frequency.
In the present embodiment, described capacitance type potential transformer malfunction monitoring instrument can gather the three-phase secondary voltage of three-phase Capacitor voltage transformer (VT), and by the processing calculating to described three-phase secondary voltage, needing to obtain the parameter information of understanding, judge according to described parameter whether capacitance type potential transformer exists unusual and fault at last.The capacitance type potential transformer trouble-monitoring instrument is directly connected on the power equipment when using, do not need to change original power equipment structure, and the parameter of fault basis for estimation is directly calculated by the capacitance type potential transformer output voltage, parameter stability is reliable, integral body has reduced the operation risk of electric system, has improved system reliability.
Embodiment two
Figure 10 is the disclosed capacitance type potential transformer malfunction monitoring of embodiment of the invention instrument the second structural representation, and referring to shown in Figure 10, described capacitance type potential transformer malfunction monitoring instrument 100 can comprise:
The data acquisition unit 201 of the secondary voltage of each phase of collection three-phase Capacitor voltage transformer (VT).
Be connected with described data acquisition unit, the secondary voltage of processing described each phase obtains any one or a plurality of parameter in three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, judge any or a plurality of preset standard scope that whether exceeds in described three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, and in judged result when being, send the processor 202 of corresponding out-of-limit alarm.
Be connected with described processor 202, store the storer 203 of out-of-limit alarm signal and fault category mapping table.
Wherein, the corresponding a plurality of possible faults of a kind of alerting signal possibility, for example, when the out-of-limit alarm signal of three-phase open delta voltage occurring, possible fault has capacitance type potential transformer built-in electrical insulation fault and leak current fault.
Be connected with described processor 202, according to the corresponding relation in described out-of-limit alarm signal and the fault category mapping table, find out the fault category corresponding with described out-of-limit alarm signal according to the out-of-limit alarm signal that occurs, and show the display 204 of described fault category.
When the corresponding a plurality of possible fault of out-of-limit alarm signal that occurs, the O﹠M staff need to check the fault that may occur successively according to actual conditions, until find real guilty culprit.
Described display can also be used in the situation that described processor 202 the determination result is NO, the display of the normal indication information of output parameter.
The normal printed words of display screen output parameter be can directly pass through, any one or a plurality of numerical value shown simultaneously in three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude calculate.
In the present embodiment, capacitance type potential transformer malfunction monitoring instrument is according to the three-phase secondary voltage of the three-phase Capacitor voltage transformer (VT) that collects, calculate the parameter information that needs understanding, judge according to described parameter whether capacitance type potential transformer exists unusual and fault at last.This capacitance type potential transformer malfunction monitoring instrument is directly connected on the power equipment when using, do not need to change original power equipment structure, and the parameter of fault basis for estimation is directly calculated by the capacitance type potential transformer output voltage, parameter stability is reliable, integral body has reduced the operation risk of electric system, has improved system reliability.This capacitance type potential transformer malfunction monitoring instrument can be predicted possible fault type simultaneously, and by display device information is conveyed to the user, is convenient to the user and locates easily and fast fault and get rid of fault.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise the article of a series of key elements or equipment, but also comprise other key elements of clearly not listing, or also be included as this article or the intrinsic key element of equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within the article that comprise described key element or the equipment and also have other identical element.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a capacitance type potential transformer malfunction monitoring instrument is characterized in that, comprising:
The data acquisition unit of the secondary voltage of each phase of collection three-phase Capacitor voltage transformer (VT);
Be connected with described data acquisition unit, the secondary voltage of processing described each phase obtains any one or a plurality of parameter in three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, judge any or a plurality of preset standard scope that whether exceeds in described three-phase open delta voltage, Voltage unbalance degree and the voltage transformer (VT) amplitude, and in judged result when being, send the processor of corresponding out-of-limit alarm.
2. malfunction monitoring instrument according to claim 1 is characterized in that, described processor comprises:
Calculate the vector difference of the magnitude of voltage on two power leads of described three-phase Capacitor voltage transformer (VT) three-phase opening part, and with first single-chip microcomputer of described vector difference as the three-phase open delta voltage;
Be connected with described the first single-chip microcomputer, judge whether the amplitude of described three-phase open delta voltage exceeds the first comparer of default three-phase open delta voltage scope;
Being connected with described the first comparer, is in the situation that is in the judged result of described the first comparer, sends the first alarm of three-phase opening voltage out-of-limit alarm.
3. malfunction monitoring instrument according to claim 1 is characterized in that, described processor comprises:
Calculate the amplitude absolute value differences of any two-phase secondary voltage, and with the secondary voltage amplitude of described difference divided by any phase in described any two-phase, obtain the second singlechip of Voltage unbalance degree;
Be connected with described second singlechip, judge whether described Voltage unbalance degree exceeds the second comparer of default Voltage unbalance degree scope;
Being connected with described the second comparer, is in the situation that is in the judged result of described the second comparer, sends the second alarm of the out-of-limit alarm of Voltage unbalance degree.
4. malfunction monitoring instrument according to claim 1 is characterized in that, described processor comprises:
Judge whether the secondary voltage amplitude of any phase exceeds the 3rd comparer of default voltage transformer (VT) amplitude range;
Being connected with described the 3rd comparer, is in the situation that is in the judged result of described the 3rd comparer, sends the 3rd alarm of the out-of-limit alarm of voltage transformer (VT) amplitude.
5. each described malfunction monitoring instrument is characterized in that according to claim 1-4, also comprises:
Link to each other with described processor, store the storer of out-of-limit alarm signal and fault category mapping table.
6. malfunction monitoring instrument according to claim 5 is characterized in that, also comprises:
Link to each other with described processor, according to the corresponding relation in described out-of-limit alarm signal and the fault category mapping table, find out the fault category corresponding with described out-of-limit alarm signal according to the out-of-limit alarm signal that occurs, and show the display of described fault category.
7. malfunction monitoring instrument according to claim 6 is characterized in that, described display is in the described processor situation that the determination result is NO, the display of the normal indication information of output parameter.
8. malfunction monitoring instrument according to claim 1 is characterized in that, described data acquisition unit is the four-way data acquisition unit.
9. each described claim is characterized in that according to claim 2-4, and described alarm is at least a in LED lamp and the hummer.
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| 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 |
| CN104034977A (en) * | 2014-05-29 | 2014-09-10 | 国家电网公司 | Capacitive voltage transformer electrified detector |
| CN106597349A (en) * | 2017-01-25 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | CVT measurement error on-line monitoring method and CVT measurement error on-line monitoring system based on secondary voltage |
| CN106646092A (en) * | 2016-12-13 | 2017-05-10 | 中国二冶集团有限公司 | Detection method for secondary system of voltage transformer |
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| 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 |
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| CN110703014A (en) * | 2019-09-27 | 2020-01-17 | 西安西电物联技术有限公司 | Capacitor monitoring method based on open delta voltage |
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| CN112485556A (en) * | 2020-11-03 | 2021-03-12 | 国电南瑞南京控制系统有限公司 | CVT fault detection method and system based on transformer substation monitoring system and storage medium |
| CN114113944A (en) * | 2021-11-25 | 2022-03-01 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
| CN117554881A (en) * | 2023-12-01 | 2024-02-13 | 南方电网调峰调频发电有限公司检修试验分公司 | On-line monitoring method and device for capacitive voltage transformer and computer equipment |
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| CN112485556A (en) * | 2020-11-03 | 2021-03-12 | 国电南瑞南京控制系统有限公司 | CVT fault detection method and system based on transformer substation monitoring system and storage medium |
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