CN104730343A - High voltage electricity capacitive equipment dielectric loss on-line monitoring method and monitoring system - Google Patents
High voltage electricity capacitive equipment dielectric loss on-line monitoring method and monitoring system Download PDFInfo
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Abstract
The invention provides a high voltage electricity capacitive equipment dielectric loss on-line monitoring method. The method comprises the steps of synchronously collecting a leakage current signal of monitored equipment, a voltage signal of the output end of a transformer PT and a reference voltage signal of a selected reference voltage source according to a synchronous sampling signal of a synchronous generator; obtaining effective values of the leakage current signal and the voltage signal, a phase difference value between the leakage current signal and the reference voltage signal and a phase difference value between the voltage signal and the reference voltage signal; obtaining data of the effective value and the phase difference values through a wireless communication module; calculating to obtain parameters such as the leakage current of the monitored equipment, the dielectric loss factor and the electric capacity. The invention further provides a high voltage electricity capacitive equipment dielectric loss monitoring system used for implementing the above method. According to the high voltage electricity capacitive equipment dielectric loss on-line detection method, the communication data size in monitoring can be decreased, the defect of timing by using wire communication and a satellite is avoided, and the monitoring cost is reduced.
Description
Technical field
The present invention relates to technical field of electric power detection, particularly a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring method of the insulated on-line monitoring for high-tension electricity capacitive apparatus.The invention still further relates to a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring system.
Background technology
In power industry, the fault of the high-tension apparatus overwhelming majority shows as the decline of dielectric level, and then causes puncturing, the safe and stable operation of harm electrical network.In high-tension apparatus except transmission line of electricity, be all concentrate to be placed in transformer station, and its major part also belong to capacitive apparatus, One's name is legion, once generation problem will directly endanger the safety and stablization of electrical network.The monitoring of the capacitive apparatus insulated situation of high-tension electricity is mainly to the monitoring of its dielectric dissipation factor tan δ, Leakage Current Ip and electric capacity C.The test philosophy of dielectric loss for the Leakage Current signal Ip of measurand and its voltage signal Up born is carried out phase compare, thus obtains the dielectric dissipation factor tan δ of equipment.
In existing capacitive apparatus insulated monitoring system, because the dielectric dissipation factor of high voltage capacitive apparatus is usually very little, again because the collection point of voltage and Leakage Current is distant, thus monitoring system needs to produce point-device synchronous sampling signal, and send each sampled point to without what postpone (or etc. delay), to carry out synchronized sampling to the Leakage Current of monitored all high voltage capacitive apparatus with the voltage born is point-device, then the sampled data every cycle being no less than at 200 is sent to control system, control system more successively computing draw the effective value of the Leakage Current Ip of each equipment, dielectric dissipation factor tan δ, electric capacity C and voltage effective value etc.
In above-mentioned monitoring system, because needs realize precise synchronization between Leakage Current collection and voltage acquisition, if need optical fiber telecommunications system be adopted, need the time delay accurately controlling all communication ports, technical difficulty is high, and also needs to be equipped with optical transmitter and receiver at each data collection point, and its cost is very high.And adopt accurate synchronized sampling, if use satellite time service system, also need in each collection point satellite clock receiving equipment is installed, simultaneously along with the increase of monitoring point, the calculation process amount of amount of communication data and control system also can sharply increase, and therefore the cost of existing monitoring system also often remains high.
Summary of the invention
In view of this, the present invention is intended to propose a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring method, to reduce the amount of communication data in monitoring, avoids the deficiency using wire communication and satellite time transfer, reduces monitoring cost.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of high-tension electricity capacitive apparatus medium loss on-line monitoring method, it comprises:
According to the Leakage Current signal of the synchronous sampling signal synchronous acquisition equipment under test of synchronous generator and the reference voltage signal through selected reference power source, obtain the effective value I of the Leakage Current signal of equipment under test, and the current phase difference Φ i between described Leakage Current signal and described reference voltage signal;
According to the voltage signal of described synchronous sampling signal synchronous acquisition transformer PT output terminal and the reference voltage signal through selected reference power source, obtain the effective value U of the voltage signal of electrical network, and the voltage-phase difference Φ u between described voltage signal and described reference voltage signal;
Control module obtains Leakage Current signal effective value I, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u by wireless communication module, and Leakage Current Ip, the dielectric dissipation factor tan δ and electric capacity C of equipment under test is calculated according to described Leakage Current signal effective value I, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u, wherein
Leakage Current Ip=I;
Dielectric loss angle δ=pi/2-(Φ i-Φ u);
Electric capacity C=Ip/2 π fU, f are mains frequency.
Further, the synchronous sampling signal of described synchronous generator adopts radio communication mold block transfer.
Further, the voltage of described reference power source is 220V, in transformer station, alternating current 220V selectes phase, and such as A phase.
Further, described Leakage Current signal, voltage signal and reference voltage signal adopt many cycles high-speed sampling.
Relative to prior art, of the present invention have following advantage:
(1) high-tension electricity capacitive apparatus medium loss on-line monitoring method of the present invention, the synchronized sampling between coherent signal is realized according to the synchronous sampling signal of synchronizing generator generation, clock receiving equipment need be increased compared to the time service of employing satellite clock can greatly reduce costs, and in this method, adopt the method introducing the reference voltage signal spread all in transformer station, reduce sample-synchronous requirement, i.e. voltage acquisition module and each current acquisition inside modules synchronous acquisition signal, and the collection synchronism between each module can lower the requirement, thus need not the time difference that each module receives synchronizing signal be processed.And owing to only signal effective value and phase difference value need be transmitted, thus also significantly can reduce amount of communication data, adopt wireless communication module compared to the wire communication modes such as optical fiber communication also more convenient enforcement simultaneously, also can reduce the monitoring cost of monitoring system.
(2) synchronous sampling signal also adopts radio communication mold block transfer thoroughly can avoid adopting the drawback of the wire communication mode field wirings such as optical fiber, adopts many cycles to adopt the degree of accuracy can guaranteeing sampled result fast.
(3) make the voltage of reference power source be the power supply point that 220V conveniently can select nearby, and utilize 220V power supply signal signal as the reference voltage, other signal that in each device, signal and needs gather can be synchronous well, ensure that synchronous precision.Especially the synchronizing signal between each device can be relaxed, and does not namely need the beginning collection signal of all devices all absolute synchronization, so just can adapt to certain communication delay, reduce the difficulty of technology.
Another object of the present invention is to propose a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring system, to realize effective use of above-mentioned detection method.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of high-tension electricity capacitive apparatus medium loss on-line monitoring system, is characterized in that comprising:
Current acquisition module, described current acquisition module comprises the current transformer, the single-chip microcomputer that are installed on each circuitry phase of equipment under test, connect the A/D converter be arranged between described current transformer and single-chip microcomputer, and be connected to the voltage transformation module through selected reference power source output terminal;
Voltage acquisition module, described voltage acquisition module comprises the voltage transformer (VT), the single-chip microcomputer that are installed on each circuitry phase of transformer output terminal, connect the A/D converter be arranged between described voltage transformer (VT) and single-chip microcomputer, and be connected to the voltage transformation module of described reference power source output terminal;
Control module, described control module comprises control module and synchronous generator;
Wireless communication module, wireless connections are in described control module and between current acquisition module and voltage acquisition module.
Further, described current transformer adopts zero-flux current transformer, and described A/D converter adopts 16 A/D converters.
Further, described single-chip microcomputer adopts high-speed microprocessor, and described high-speed microprocessor is built-in with FFT arithmetic element.
Further, noninductive resistance is adopted in described voltage transformation module.
Further, described wireless communication module adopts Zigbee wireless communication module.
Further, in described wireless communication module, installation is provided with wireless repeater.
Relative to prior art, of the present invention have following advantage:
(1) high-tension electricity capacitive apparatus medium loss on-line monitoring system of the present invention, current acquisition module and voltage acquisition module can to the leakage current signals of equipment under test, the voltage signal of transformer PT output terminal and the reference voltage signal of reference power source are sampled, and the process that can realize on the spot sampled signal, to reduce the amount of communication data that need transmit, the control module of control module can according to current acquisition module and voltage acquisition module collection and the data operation of process draws the dielectric property parameter of equipment under test, and dielectric property parameter can be carried out showing and other process, synchronizing generator then can produce synchronous sampling signal under the control of the control unit, to realize the synchronized sampling of current acquisition module and voltage acquisition module, wireless communication module then can realize the Wireless Data Transmission of each intermodule, to avoid the drawback adopting wire communication mode, reduce system cost.
(2) zero-flux current transformer and 16 A/D converters is adopted can to ensure precision and the real-time of sampled data, high-speed microprocessor and built-in FFT arithmetic element thereof can realize the process of high-speed sampling and sampled signal, voltage transformation module employing noninductive resistance can reduce the conversion phase shift during conversion of reference voltage, adopts wireless repeater then can realize the efficient communication under at a distance.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the high-tension electricity capacitive apparatus medium loss on-line monitoring system described in the embodiment of the present invention;
Fig. 2 is the structural representation of the current acquisition module described in the embodiment of the present invention;
Fig. 3 is the structural representation of the voltage acquisition module described in the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiment one
The present embodiment relates to a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring system, it comprises the current acquisition module be arranged on equipment under test, be arranged on the voltage acquisition module on the transformer PT output terminal that is electrically connected with equipment under test, and the work of current acquisition module and voltage acquisition module controlled and the control module that can process the data of current acquisition module and voltage acquisition module collection, also comprise the wireless communication module for realizing control module and the wireless connections between current acquisition module and voltage acquisition module.
Control module in the present embodiment comprises control module and synchronizing generator, control module can realize the centralized control to parts each in system, and calculation process can be carried out to the data of current acquisition module and voltage acquisition module collection, and operation result is shown or other process, as generated daily record, early warning, warning message are set, and complete the issue of result data and carry out exchanges data etc. with other platform.In the present embodiment, control module is computing machine, and it also can adopt as embedded integrated touch-screen etc. has the device of data processing display capabilities certainly.Synchronizing generator is used for producing synchronous sampling signal under the control of the control unit, and can be sent to current acquisition module and voltage acquisition module via wireless communication module, to realize the synchronized sampling between current acquisition module and voltage acquisition module.
Wireless communication module in the present embodiment adopts Zigbee wireless communication module, it comprises and the control module in control module and synchronizing generator, and current acquisition module and voltage acquisition module be connected respectively multiple, thus control module and the wireless connections between current acquisition module and voltage acquisition module can be realized.The structure of the current acquisition module in the present embodiment can be as shown in Figure 2, it comprises the current transformer be installed on each circuitry phase of equipment under test, the A/D converter be connected with the output terminal of each current transformer, and be connected to the single-chip microcomputer of A/D converter output terminal, also be connected with a voltage transformation module at the input end of A/D converter, the input end of voltage transformation module is connected to the output terminal once selected reference power source.
Current transformer letter C T represents in fig. 2, and in the present embodiment, current transformer can adopt zero-flux current transformer, can detect the conversion phase shift of small Leakage Current and minimizing Leakage Current.For improving sampling precision in the present embodiment, A/D converter is also employing 16 A/D converters, and it can adopt synchronous 16 A/D converters in 6 tunnels further in actual use.In current acquisition module, be realize high-speed sampling to Leakage Current, single-chip microcomputer also can be employing high-speed microprocessor, and in high-speed microprocessor built-in FFT arithmetic element, utilize FFT arithmetic element well can remove the humorous of sampled signal and involve noise.Utilize high-speed microprocessor also can generate the effective value of the Leakage Current signal of collection, and the phasing degree of the phasing degree of Leakage Current signal gathered and the reference voltage signal of reference power source, and can compare the phasing degree of the reference voltage signal of Leakage Current signal and reference power source, to draw both phase difference values.
The structure of the voltage acquisition module in the present embodiment as shown in Figure 3, it comprises the voltage transformer (VT) be installed on each circuitry phase of transformer PT output terminal, the A/D converter be connected with the output terminal of voltage transformer (VT), and be connected to the single-chip microcomputer of A/D converter output terminal, be also connected with at the input end of A/D converter the voltage transformation module that is connected to the output terminal of reference power source.Voltage transformer (VT) is represented by alphabetical PT in figure 3, and A/D converter and single-chip microcomputer are also respectively employing 16 A/D converters and are built-in with the high-speed microprocessor of FFT arithmetic element, 16 A/D converters also can adopt synchronous 16 A/D converters in 6 tunnels further in actual use.Be the conversion phase shift that the reference voltage reducing reference power source occurs after voltage transformation module in the present embodiment simultaneously, in the voltage transformation module in voltage acquisition module and current acquisition module, be use noninductive resistance.Voltage transformation module can adjust with reference to the voltage signal of power supply, matches with the amplitude of other collection signal with A/D converter input end.
Substantially identical with current acquisition module in the function of voltage acquisition module high speed single-chip microcomputer, also for realizing, shaping and noise reduction process being carried out to collection signal, generating the phase difference value between the effective value of the voltage signal of collection and the reference voltage signal of voltage signal and reference power source simultaneously.The one-piece construction of the high-tension electricity capacitive apparatus medium loss on-line monitoring system of the present embodiment can be as shown in fig. 1, in FIG current acquisition module be correspond to multiple different equipment under test arrange multiple, voltage acquisition module is then because it only has one for being arranged at transformer PT output terminal.Zigbee wireless communication module can realize control module, wireless connections between the computing machine also namely adopted in the present embodiment and each current acquisition module and voltage acquisition module, synchronizing generator can produce synchronous sampling signal under the control command of computing machine, and is sent to current acquisition module and voltage acquisition module via Zigbee wireless communication module.Be ensure that computing machine is connected with the effective of current acquisition intermodule on equipment under test, also can settle wireless repeater in wireless communication module in the present embodiment when equipment under test is distant.
This high-tension electricity capacitive apparatus medium loss on-line monitoring system is according to the synchronous sampling signal of synchronizing generator, the Leakage Current to equipment under test can be realized by current transformer and voltage transformer (VT), and equipment under test bear the synchronous acquisition of the reference voltage of voltage and reference power source, utilize A/D converter and single-chip microcomputer can realize the treatment in situ of collection signal at current acquisition module or voltage acquisition module place, to obtain the operational data needed for control module, built-in operation program within it can be utilized in a control unit to draw each dielectric property parameter of equipment under test.And realize the wireless connections between them in control module and between current acquisition module and voltage acquisition module by wireless communication module, also can avoid the drawback using wired connection mode.
Embodiment two
The present embodiment relates to a kind of high-tension electricity capacitive apparatus medium loss on-line monitoring method, when needing to detect the dielectric property parameter of equipment under test, the control module of system, also namely computing machine sends sample command by Zigbee wireless communication module to current acquisition module and voltage acquisition module, simultaneous computer also control synchronization generator produces synchronous sampling signal, and synchronous sampling signal is sent to current acquisition module and voltage acquisition module.In the present embodiment, the synchronous sampling signal of synchronous generator is also sent to current acquisition module and voltage acquisition module via Zigbee wireless communication module.Certainly except Zigbee wireless communication module can be used, WIFI module in the present embodiment, also can be used to be used for radio communication.
At current acquisition module place, after high-speed microprocessor receives sample command, control according to the synchronous sampling signal of synchronizing generator the zero-flux current transformer be placed on each circuitry phase of equipment under test to sample to Leakage Current signal, and via after synchronous 16 A/D converters conversion in 6 tunnels, sampled signal is gathered, high-speed microprocessor is also sampled to the reference voltage signal through selected reference power source simultaneously, reference voltage signal becomes and matches with the amplitude of Leakage Current signal of sampling after voltage transformation module adjusts, and also gathered by high-speed microprocessor after synchronous 16 A/D converters conversion in 6 tunnels.The voltage of reference power source selected in the present embodiment can be 220V, and high-speed microprocessor controls zero-flux current transformer to the sampling of Leakage Current, and high-speed microprocessor is also employing many cycles high-speed sampling to the sampling of the reference voltage signal of reference power source, the sampled point of each cycle such as can be 256.
After the high-speed microprocessor of current acquisition module collects the Leakage Current signal of equipment under test and the reference voltage signal of reference power source, via the FFT arithmetic element that high-speed microprocessor is built-in, can carry out that removal is humorous involves noise reduction process to the Leakage Current signal gathered and reference voltage signal.In high-speed microprocessor, also can draw the effective value I of Leakage Current signal through computing simultaneously, and the phase place of Leakage Current signal and the phase place of reference voltage signal, and the phase difference value of Leakage Current signal and reference voltage signal phasetophase can be obtained, this phase difference value is referred to as current phase difference Φ i.The effective value I of the Leakage Current signal obtained in high-speed microprocessor, and this current phase difference Φ i is the operational data needed for computing machine.
At voltage acquisition module place, high-speed microprocessor in it is substantially identical with current acquisition module according to the gatherer process of the synchronous sampling signal of synchronizing generator to the voltage signal of transformer PT output terminal and the reference voltage signal of reference power source, final also obtain the transformer PT output end voltage signal needed for Computing effective value U and the voltage signal of transformer PT output terminal and the phase difference value of reference voltage signal phasetophase, this phase difference value is referred to as voltage-phase difference Φ u.At voltage acquisition module high speed single-chip microcomputer to the voltage signal of transformer PT output terminal, and adopt many cycles high-speed sampling too to the collection of the reference voltage signal of reference power source, the sampled point on each cycle also can be set to 256.
The Leakage Current signal effective value I that current acquisition module and voltage acquisition module obtain, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u through Zigbee wireless communication module by computer acquisition, computing machine can calculate Leakage Current Ip, the dielectric dissipation factor tan δ and electric capacity C of equipment under test according to Leakage Current signal effective value I, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u, the concrete grammar wherein calculated is:
Leakage Current Ip=I;
Dielectric loss angle δ=pi/2-(Φ i-Φ u);
Electric capacity C=Ip/2 π fU, f are mains frequency.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a high-tension electricity capacitive apparatus medium loss on-line monitoring method, is characterized in that the method comprises:
According to the Leakage Current signal of the synchronous sampling signal synchronous acquisition equipment under test of synchronous generator and the reference voltage signal through selected reference power source, obtain the effective value I of the Leakage Current signal of equipment under test, and the current phase difference Φ i between described Leakage Current signal and described reference voltage signal;
According to the voltage signal of described synchronous sampling signal synchronous acquisition transformer PT output terminal, obtain the effective value U of the voltage signal of transformer PT output terminal, and the voltage-phase difference Φ u between described voltage signal and described reference voltage signal;
Control module obtains Leakage Current signal effective value I, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u by wireless communication module, and Leakage Current Ip, the dielectric dissipation factor tan δ and electric capacity C of equipment under test is calculated according to described Leakage Current signal effective value I, current phase difference Φ i, voltage signal effective value U and voltage-phase difference Φ u, wherein
Leakage Current Ip=I;
Dielectric loss angle δ=pi/2-(Φ i-Φ u);
Electric capacity C=Ip/2 π fU, f are mains frequency.
2. high-tension electricity capacitive apparatus medium loss on-line monitoring method according to claim 1, is characterized in that: the synchronous sampling signal of described synchronous generator adopts radio communication mold block transfer.
3. high-tension electricity capacitive apparatus medium loss on-line monitoring method according to claim 1, is characterized in that: the voltage of described reference power source is 220V.
4. high-tension electricity capacitive apparatus medium loss on-line monitoring method according to claim 1, is characterized in that: described Leakage Current signal, voltage signal and reference voltage signal adopt many cycles high-speed sampling.
5. a high-tension electricity capacitive apparatus medium loss on-line monitoring system, is characterized in that comprising:
Current acquisition module, described current acquisition module comprises the current transformer, the single-chip microcomputer that are installed on each circuitry phase of equipment under test, connect the A/D converter be arranged between described current transformer and single-chip microcomputer, and be connected to the voltage transformation module through selected reference power source output terminal;
Voltage acquisition module, described voltage acquisition module comprises and is installed on the defeated PT of transformer and goes out to hold voltage transformer (VT), single-chip microcomputer on each circuitry phase, connect the A/D converter be arranged between described voltage transformer (VT) and single-chip microcomputer, and be connected to the voltage transformation module of described reference power source output terminal;
Control module, described control module comprises control module and synchronous generator;
Wireless communication module, wireless connections are in described control module and between current acquisition module and voltage acquisition module.
6. high-tension electricity capacitive apparatus medium loss on-line monitoring system according to claim 5, is characterized in that: described current transformer adopts zero-flux current transformer, and described A/D converter adopts 16 A/D converters.
7. high-tension electricity capacitive apparatus medium loss on-line monitoring system according to claim 5, is characterized in that: described single-chip microcomputer adopts high-speed microprocessor, and described high-speed microprocessor is built-in with FFT arithmetic element.
8. high-tension electricity capacitive apparatus medium loss on-line monitoring system according to claim 5, is characterized in that: adopt noninductive resistance in described voltage transformation module.
9. high-tension electricity capacitive apparatus medium loss on-line monitoring method according to claim 5, is characterized in that: described wireless communication module adopts Zigbee wireless communication module.
10. high-tension electricity capacitive apparatus medium loss on-line monitoring system according to claim 5, is characterized in that: install in described wireless communication module and be provided with wireless repeater.
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| CN105319448A (en) * | 2015-11-13 | 2016-02-10 | 广州供电局有限公司 | A system and a method for simulating the dielectric loss of capacitive apparatuses in a high voltage environment |
| CN105606902A (en) * | 2015-11-24 | 2016-05-25 | 国网福建省电力有限公司 | Wireless measurement method for dielectric loss factor of capacitive devices |
| CN106707054A (en) * | 2016-11-23 | 2017-05-24 | 河池学院 | Electrical equipment fault diagnosis robot |
| CN106546869A (en) * | 2016-12-27 | 2017-03-29 | 哈尔滨理工大学 | A kind of hollow power reactor turn-to-turn insulation On-line Fault monitoring device |
| CN108535551B (en) * | 2018-05-11 | 2019-09-20 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on wireless telecommunications |
| CN108872711A (en) * | 2018-05-11 | 2018-11-23 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on same AC power source |
| CN108535551A (en) * | 2018-05-11 | 2018-09-14 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on wireless telecommunications |
| CN109856451A (en) * | 2018-10-09 | 2019-06-07 | 胡大良 | A kind of multi-loop electric tolerance detection system |
| CN110187193A (en) * | 2019-06-19 | 2019-08-30 | 武汉华瑞智深电气技术有限公司 | Dielectric loss based on whole station voltage transformer judgement of stability monitors system and method |
| CN110231515A (en) * | 2019-06-19 | 2019-09-13 | 桂林理工大学 | A kind of real-time online measuring method of insulation life test(ing) medium loss factor |
| CN110231515B (en) * | 2019-06-19 | 2021-04-09 | 桂林理工大学 | Real-time online measurement method for dielectric loss factor of insulation life test |
| CN110187193B (en) * | 2019-06-19 | 2022-08-16 | 武汉华瑞智深电气技术有限公司 | Dielectric loss monitoring system and method based on total-station voltage transformer stability judgment |
| CN111521876A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司东莞供电局 | Capacitive equipment on-line monitoring method and device |
| CN111521876B (en) * | 2020-05-08 | 2022-04-12 | 广东电网有限责任公司东莞供电局 | Capacitive equipment on-line monitoring method and device |
| CN113985139A (en) * | 2021-10-15 | 2022-01-28 | 国网电力科学研究院武汉南瑞有限责任公司 | Frequency domain dielectric response measuring device and method for valve side sleeve of converter transformer |
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Application publication date: 20150624 |