CN203249977U - Bushing-based transformer on-line monitoring system - Google Patents

Bushing-based transformer on-line monitoring system Download PDF

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Publication number
CN203249977U
CN203249977U CN 201320315926 CN201320315926U CN203249977U CN 203249977 U CN203249977 U CN 203249977U CN 201320315926 CN201320315926 CN 201320315926 CN 201320315926 U CN201320315926 U CN 201320315926U CN 203249977 U CN203249977 U CN 203249977U
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China
Prior art keywords
sleeve pipe
transformer
voltage
bushing
monitoring system
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CN 201320315926
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龙凯华
马继先
刘少宇
贺惠民
陈宁
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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Abstract

The utility model provides a bushing-based transformer on-line monitoring system comprising a transformer. A bushing connected to the transformer comprises an external porcelain bushing, a guiding rod and a flange, a capacitance core is disposed between the guiding rod and the flange, the capacitance core is wrapped on the guiding rod, and the flange is connected to the end screen of the capacitance core. A sensor unit collecting an end screen voltage output by the bushing is connected to the bushing, and sends the end screen voltage to a background monitoring device through a cable. A primary wire of the bushing is connected to a bus. A voltage transformer is connected to the bus to test the voltage of the bus, and sends the tested voltage to the background monitoring device through a cable. The background monitoring device is connected with the cables to obtain the voltages of the end screen and the bus and to display tested results. By employing the bushing-based transformer on-line monitoring system, the insulation property of a capacitive device can be quantitatively determined, and an insulation changing trend of the capacitive device is dynamically analyzed.

Description

A kind of transformer online monitoring system based on sleeve pipe
Technical field
The utility model particularly about the on-line monitoring technique field of transformer, is a kind of transformer online monitoring system based on sleeve pipe about the transformer technology field in the electric system concretely.
Background technology
Power industry is the in advance industry of national industry, and the stable development of power industry is the basis of national economy sustainable development.Transformer is the important component part of electric system, and its running status directly affects Security of the system.Along with developing rapidly of UHV (ultra-high voltage) and extra-high voltage technology, net capacity strengthens and coverage rate augmentation, and its fault may cause great harm and impact to electric system and user.
Sleeve pipe is widely used in the power equipment of electric current being introduced or drawing the metal shell such as transformer in the electric system, plays simultaneously the mechanical support effect.The casing-type that at present power transformer is commonly used is Oil-impregnated Paper Condenser Bushing in History, its structural model as shown in Figure 2, as shown in Figure 2, sleeve pipe is comprised of outer insulator 203, capacitor core 202, guide rod 201 and mounting flange 204 etc.Sleeve pipe adds capacitor core 202 as interior insulation between guide rod 201 and flange 204, capacitor core 202 is wrapped on the guide rod 201 for multi-layer cable paper soaks with mineral oil, interlayer has metal polar plate to make the electric field homogenizing on inside pipe casing and surface, preventing sliding the sudden strain of a muscle, can equivalence be a string coaxial cylindrical condenser series connection.Generally have one to measure small casing on casing flange, this small casing links to each other with the end shield of capacitor core, ground connection during the transformer operation, during maintenance for testing.With the condenser-type terminal equivalence be lumped parameter model as shown in Figure 3, R1 be guide rod to the insulation resistance of bottom shielding of bushing, R2 is bottom shielding of bushing equivalent resistance over the ground, C1 be guide rod to the equivalent capacity of bottom shielding of bushing, C2 is over the ground spuious of bottom shielding of bushing.Wherein R1 and R2 are generally hundreds of megaohms, can be considered open circuit.
In the prior art, the general superpotential current zero time difference relative method that adopts of sleeve pipe dielectric loss monitoring by relatively putting on the voltage and current zero passage moment on the sleeve pipe, is tried to achieve phase differential between the two, thus the calculation medium loss angle.This method adopts the current sensor measurement electric current of punching structure more, and is no matter active or passive, and stability, the accuracy problem of extracting low current signal are difficult to obtain comparatively adequate solution.
The utility model content
The utility model embodiment provides a kind of transformer online monitoring system based on sleeve pipe, for transformer online monitoring is offered help, utilized the capacitance characteristic of bushing shell for transformer, adopt the signals collecting mode of voltage divider dividing potential drop, realized simply comprising the on-line monitoring of the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, bottom shielding of bushing broken string or loose contact defect inspection several functions.
The purpose of this utility model is, a kind of transformer online monitoring system based on sleeve pipe is provided, and comprises transformer; At least one sleeve pipe that is connected with described transformer, described sleeve pipe comprises outer insulator, guide rod and flange, be provided with capacitor core between described guide rod and described flange, described capacitor core is wrapped on the described guide rod, and described flange links to each other with the end shield of described capacitor core; Sensor unit is connected with described sleeve pipe, is used for gathering the end shield voltage of described sleeve pipe output, and by cable described end shield voltage is sent to the backstage monitoring device; An outlet of described sleeve pipe is connected with bus; Voltage transformer (VT) is connected with described bus, is used for measuring the voltage of described bus, and is sent to the backstage monitoring device by described cable; Described backstage monitoring device is connected with described cable, is used for receiving the voltage of described end shield voltage and described bus, and shows monitoring result.
Preferably, the capacitance of described sensor unit is greater than the end shield stray capacitance value over the ground of described sleeve pipe.
Preferably, described transformer online monitoring system based on sleeve pipe also comprises: the electronic installation that is connected with described cable is used for the voltage of described end shield voltage and described bus is sent to described backstage monitoring device.
Preferably, described sleeve pipe is condenser bushing.
Preferably, described cable is concentric cable.
Preferably, described backstage monitoring device is oscillograph.
Preferably, described backstage monitoring device is the Substation control platform.
The beneficial effects of the utility model are, the measuring system realization dielectric loss monitoring that a kind of voltage measurement and zero passage relative method combine has been proposed, can quantitatively judge the insulating property of capacitive apparatus and the trend that its insulation of performance analysis changes, for transformer online monitoring is offered help, utilize the capacitance characteristic of bushing shell for transformer, adopt the signals collecting mode of voltage divider dividing potential drop, realized simply comprising the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, the on-line monitoring of bottom shielding of bushing broken string or loose contact defect inspection several functions.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment 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 embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of intelligent electronic device IED;
Fig. 2 is the structure diagram of sleeve pipe of the prior art;
Fig. 3 is the equivalent circuit diagram of sleeve pipe of the prior art;
Fig. 4 is the sleeve pipe dielectric loss monitoring principle figure of the utility model embodiment;
The structured flowchart of the embodiment one of a kind of transformer online monitoring system based on sleeve pipe that Fig. 5 provides for the utility model embodiment;
The structured flowchart of the embodiment two of a kind of transformer online monitoring system based on sleeve pipe that Fig. 6 provides for the utility model embodiment;
Fig. 7 for the utility model embodiment provide a kind of based on the transformer online monitoring system middle sleeve of sleeve pipe and the circuit theory diagrams of sensor unit;
A kind of structured flowchart based on the embodiment three of backstage monitoring device in the transformer online monitoring system of sleeve pipe that Fig. 8 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of transformer online monitoring system based on sleeve pipe, for transformer online monitoring is offered help, utilized the capacitance characteristic of bushing shell for transformer, adopt the signals collecting mode of voltage divider dividing potential drop, realized simply comprising the on-line monitoring of the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, bottom shielding of bushing broken string or loose contact defect inspection several functions.
The structured flowchart of the embodiment one of a kind of transformer online monitoring system based on sleeve pipe that Fig. 5 provides for the utility model embodiment, as shown in Figure 5, in embodiment one, described transformer online monitoring system based on sleeve pipe specifically comprises:
Transformer 100;
At least one sleeve pipe 200 that is connected with described transformer, Fig. 2 is the structure diagram of sleeve pipe, as shown in Figure 2, sleeve pipe specifically comprises outer insulator 203, guide rod 201 and flange 204, between described guide rod 201 and described flange 204, be provided with capacitor core 202, described capacitor core 202 is wrapped on the described guide rod 201, and described flange 204 links to each other with the end shield of described capacitor core 202.
Sleeve pipe adds capacitor core as interior insulation between guide rod 201 and flange 204, capacitor core is that multi-layer cable paper soaks with mineral oil and is wrapped on the guide rod, interlayer has metal polar plate to make the electric field homogenizing on inside pipe casing and surface, preventing sliding the sudden strain of a muscle, can equivalence be a string coaxial cylindrical condenser series connection.In other embodiments of the present utility model, generally have one to measure small casing on the casing flange, this small casing links to each other with the end shield of capacitor core, ground connection during the transformer operation, during maintenance for testing.With the condenser-type terminal equivalence be lumped parameter model as shown in Figure 3, R1 be guide rod to the insulation resistance of bottom shielding of bushing, R2 is bottom shielding of bushing equivalent resistance over the ground, C1 be guide rod to the equivalent capacity of bottom shielding of bushing, C2 is over the ground spuious of bottom shielding of bushing.Wherein R1 and R2 are generally hundreds of megaohms, can be considered open circuit.
In concrete embodiment, sleeve pipe can be one or more according to the applicable scene setting of reality, as a sleeve pipe is set at single transformer, at three-phase transformer three sleeve pipes are set.Sleeve pipe of the present utility model is condenser bushing
Sensor unit 300 is connected with described sleeve pipe 200, is used for gathering the end shield voltage of described sleeve pipe output, and by cable 600 described end shield voltage is sent to backstage monitoring device 700.In the utility model, the capacitance of described sensor unit is much larger than the end shield stray capacitance value over the ground of described sleeve pipe.Cable of the present utility model is concentric cable.
Fig. 7 for the utility model embodiment provide a kind of based on the transformer online monitoring system middle sleeve of sleeve pipe and the circuit theory diagrams of sensor unit, as shown in Figure 7, the realization of sensor unit 300 parts is to adopt principle of capacitive divider.Capacitor C in the sensor unit MBy bottom shielding of bushing extension line and bottom shielding of bushing stray capacitance C over the ground 2Parallel connection is with sleeve pipe main capacitance C 1The series connection dividing potential drop.In order to protect capacitor C MDo not bear too high pulse voltage, incorporate overvoltage arrester SA at its two ends.Capacitor C MOn voltage send by matched impedance and concentric cable.Capacitor C MDesign load should be much larger than C 1And C 2, to guarantee C MOn voltage be fit to measure.
An outlet of described sleeve pipe is connected with bus 400;
Voltage transformer (VT) 500 is connected with described bus 400, is used for measuring the voltage of described bus, and is sent to backstage monitoring device 700 by described cable 600, and in concrete embodiment, voltage transformer (VT) 500 can be realized by bus PT.
Described backstage monitoring device 700 is connected with described cable 600, is used for receiving the voltage of described end shield voltage and described bus, and shows monitoring result.
The structured flowchart of the embodiment two of a kind of transformer online monitoring system based on sleeve pipe that Fig. 6 provides for the utility model embodiment, as shown in Figure 6, in embodiment two, described in the parts of transformer online monitoring system in embodiment one of sleeve pipe, also comprise the electronic installation 800 that is connected with described cable 600, be used for the voltage of described end shield voltage and described bus is sent to described backstage monitoring device.In concrete embodiment, electronic installation 800 can be realized by intelligent electronic device (IED), can be sent to the backstage monitoring device by modes such as communication protocol, modulator-demodular unit or LAN (Local Area Network).
Fig. 1 is the circuit theory diagrams of intelligent electronic device IED; as shown in Figure 1; intelligent electronic device (IED) mainly comprises microprocessor chip and various peripheral circuit, programmable logic controller (PLC) and various peripheral circuit thereof, DSP digital signal processing chip; can realize on the spot intellectuality, informationization at transformer field; monitoring information is converted to the signal form of being convenient to transmit; add that safeguard measure to prevent the external interference in the transmission course, is sent to the backstage monitoring device by modes such as communication protocol, modulator-demodular unit or LAN (Local Area Network).
The utility model utilizes the special construction of sleeve pipe to offer help for transformer online monitoring, comprises the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, bottom shielding of bushing broken string or loose contact defect inspection.These monitorings will realize at transformer on the same stage by the whole flow process of a cover.
The system that the utility model provides can be achieved as follows the on-line monitoring purpose: the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, bottom shielding of bushing broken string or loose contact defect inspection.The below describes one by one.
The monitoring of sleeve pipe dielectric loss
Backstage of the present utility model monitoring device can be oscillograph.In other embodiments, described backstage monitoring device also can be the Substation control platform.The implementation method of sleeve pipe dielectric loss monitoring is as follows: the backstage monitoring device is by the voltage on the bus PT acquisition high voltage bus Obtain bottom shielding of bushing dividing potential drop capacitor C by sensor unit MVoltage Obtain voltage by the zero passage comparative approach again And voltage Vector angle, be made as Can calculate tangent value Because capacitor C MDesign load is much larger than C 2, ignore and pass through C 2Electric current, think and pass through C 1And C MElectric current be Then by vector relations among the sleeve pipe dielectric loss monitoring principle figure shown in Figure 4 as can be known;
Because capacitor C MDesign load is much larger than C 1, therefore can be reduced to:
Can try to achieve the Dielectric loss tangent value of sleeve pipe.In power industry, dielectric loss all represents by its tangent value.This method has effectively been avoided the collection of Small Current Signal, realizes that simply, it is strong to suppress harmonic wave and noise ability, and arithmetic accuracy is high.
The monitoring of capacitance of bushing amount
The implementation method of capacitance of bushing amount monitoring is: the electric capacity of normal condition running casing is comparatively stable numerical value, and when the problems such as the puncture of generation capacitance plate, humidified insulation, insulation degradation, sleeve pipe oil starvation, electric capacity can increase or reduce, and the variable quantity of electric capacity is at least more than 1%, take the capacitance plate breakdown problem as example, the capacitance plate of each electric pressure typical case sleeve pipe punctures the caused capacitance of bushing rate of change of one deck and just reaches more than 1.4%, and is as shown in table 1.System and device of the present utility model is installed on the Three-Phase Transformer sleeve pipe, as shown in Figure 8, according to each phase voltage sensor output quantity U MCalculate capacitance of bushing C 1, comparison one gets the mean value (in other embodiments of the present utility model, also can determine first the mean value of three phase capacitance, determine respectively the changes delta C of each phase electric capacity and average capacitance again) of electric capacity and other two-phase electric capacity mutually, obtains the changes delta C of capacitance of bushing.Usually owing to unbalance voltage and temperature variation, capacitance variations Δ C is in 0.4% scope, so signal to noise ratio (S/N ratio) is enough to gathering reliably state of insulation, can be 1% with the threshold value setting of reporting to the police.
Table 1
Rated voltage (kV) The capacitance plate number of plies ΔC
123 28 3.6%
245 42 2.4%
400 60 1.7%
550 70 1.4%
The monitoring of primary side overvoltage signal
The implementation method of primary side overvoltage signal monitoring is: the superpotential wave recording device adopts voltage transformer pt, resistance or capacitive divider to gather overvoltage signal usually for the Distribution system design of the following electric pressure of 35kV mostly.Because the frequency response of common PT is inadequate, can not monitor many fast-changing superpotential, and resistance or capacitive divider are connected in parallel on the many energy of consumption in the system for a long time, and increase the O﹠M workload, bring potential risk to security of system.The utility model device utilizes the capacitance characteristic of sleeve pipe itself, realizes the collection to overvoltage signal, owing to high resistance, the low dielectric loss characteristic of sleeve pipe, does not have heating and the integrity problem of long-time running.The bandwidth up to several MHz is realized in the voltage sensor unit, so that its energy measurement working voltage not only also can detect superpotential, the backstage monitoring means is processed and record the signal that collects.
Partial discharge monitoring
The implementation method of partial discharge monitoring is: the shelf depreciation that the inner local location of transformer causes because of defectives such as bubble, impurity, burrs, time is short, energy is little, but the high-frequency pulse current of its formation can pass through electric capacity and capacitance of bushing coupling between winding, iron core, the casing.In sensor unit, adopt the broadband current sensor to passing through capacitor C MGround current measure, by backstage monitoring device record and observe partial discharge pulse's signal in the ground current, sensor adopts the magnetic coupling mode based on the Luo-coil principle, detects between loop and the high tension loop without direct electrical communication.
Bottom shielding of bushing broken string or loose contact defect inspection
The implementation method of bottom shielding of bushing broken string or loose contact defect inspection is: when bottom shielding of bushing broken string or loose contact occurring, because the electric capacity of cut-off point is much smaller than the capacitance of bushing amount, therefore the end shield voltage-to-ground will rise to very high in theory, cause in end shield gap generation continuation or intermittent discharge over the ground, also may produce shelf depreciation in the insulation course outside end shield.Rarely have at present relevant charged detection means that sleeve end shield discharging is detected.The utility model device is by the method for partial discharge monitoring, equally monitoring sleeve end shield discharge, the intensity of end shield discharge current pulse signal is obviously greater than partial discharge of transformer, through calibrated apparent shelf depreciation usually at hundreds of pC to several thousand pC scopes, and the discharge capacity that the end shield discharge collects can reach hundreds of thousands pC magnitude.
Below in conjunction with specific embodiment, a kind of transformer online monitoring system based on sleeve pipe that the utility model is provided elaborates.
Take the 110kV transformer as example, among Fig. 7, the 110kV capacitance of bushing C of a transformer 1Be 232pF, end shield is stray capacitance C over the ground 2Be 783.5pF.Capacitor C in the sensor unit MSelect 255nF, adopting 10 capacitances is the Capacitance parallel connection of 25.5nF, and make electric capacity according to the concentric cylinder structural arrangement to reduce the equivalent stray inductance of sensor.The estimation capacitor C MOn voltage.Overvoltage arrester SA selects the hybrid protection of metal oxide valve block MOV and gas-discharge tube, and operation voltage is 800V.With capacitor C M, overvoltage arrester SA, front end build-out resistor R pJointly be sealed in the aluminum alloy casing, metal shell grounded shield outside noise disturbs.Selecting bandwidth is that 10~20MHz, response speed are that 2mV, impulsive measurement scope are 2mV~4000mV less than 1ns, sensitivity, and the good centre path current sensor of shielding is used for partial discharge pulse's signal measurement.Backstage monitoring device and oscillograph functional similarity are realized oscillography record wave energy, and the threshold value alarm function.
In sum, useful achievement of the present utility model is: a kind of transformer online monitoring system based on sleeve pipe is provided, for transformer online monitoring is offered help, utilize the capacitance characteristic of bushing shell for transformer, adopt the signals collecting mode of voltage divider dividing potential drop, realized simply comprising on-Line Monitor Device and the method for the monitoring of sleeve pipe dielectric loss, the monitoring of capacitance of bushing amount, the monitoring of primary side overvoltage signal, partial discharge monitoring, bottom shielding of bushing broken string or loose contact defect inspection several functions.Propose the measuring method realization dielectric loss monitoring that a kind of voltage measurement and zero passage relative method combine, can quantitatively judge the insulating property of capacitive apparatus and trend that its insulation of performance analysis changes.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment system, can come the relevant hardware of instruction to finish by computer program, described program can be stored in the general computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each system when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or store-memory body (Random Access Memory, RAM) etc. at random.
Used specific embodiment in the utility model principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand its core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims (7)

1. the transformer online monitoring system based on sleeve pipe is characterized in that, described transformer online monitoring system based on sleeve pipe comprises:
Transformer;
At least one sleeve pipe that is connected with described transformer, described sleeve pipe comprises outer insulator, guide rod and flange, be provided with capacitor core between described guide rod and described flange, described capacitor core is wrapped on the described guide rod, and described flange links to each other with the end shield of described capacitor core;
Sensor unit is connected with described sleeve pipe, is used for gathering the end shield voltage of described sleeve pipe output, and by cable described end shield voltage is sent to the backstage monitoring device;
An outlet of described sleeve pipe is connected with bus;
Voltage transformer (VT) is connected with described bus, is used for measuring the voltage of described bus, and is sent to the backstage monitoring device by described cable;
Described backstage monitoring device is connected with described cable, is used for receiving the voltage of described end shield voltage and described bus, and shows monitoring result.
2. the transformer online monitoring system based on sleeve pipe according to claim 1 is characterized in that, the capacitance of described sensor unit is greater than the end shield stray capacitance value over the ground of described sleeve pipe.
3. the transformer online monitoring system based on sleeve pipe according to claim 2, it is characterized in that, described transformer online monitoring system based on sleeve pipe also comprises: the electronic installation that is connected with described cable is used for the voltage of described end shield voltage and described bus is sent to described backstage monitoring device.
4. the transformer online monitoring system based on sleeve pipe according to claim 1 is characterized in that, described sleeve pipe is condenser bushing.
5. the transformer online monitoring system based on sleeve pipe according to claim 1 is characterized in that, described cable is concentric cable.
6. the transformer online monitoring system based on sleeve pipe according to claim 1 is characterized in that, described backstage monitoring device is oscillograph.
7. the transformer online monitoring system based on sleeve pipe according to claim 1 is characterized in that, described backstage monitoring device is the Substation control platform.
CN 201320315926 2013-06-03 2013-06-03 Bushing-based transformer on-line monitoring system Active CN203249977U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106249054A (en) * 2016-09-18 2016-12-21 广州供电局有限公司 Capacitance type potential transformer and integration detection sensor thereof
CN107621574A (en) * 2017-08-25 2018-01-23 西南交通大学 Study the experimental method of loading condition setting of casing interior insulation moisture distribution

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106249054A (en) * 2016-09-18 2016-12-21 广州供电局有限公司 Capacitance type potential transformer and integration detection sensor thereof
CN106249054B (en) * 2016-09-18 2019-12-10 广州供电局有限公司 Capacitance type voltage transformer and integrated detection sensor thereof
CN107621574A (en) * 2017-08-25 2018-01-23 西南交通大学 Study the experimental method of loading condition setting of casing interior insulation moisture distribution
CN107621574B (en) * 2017-08-25 2019-01-25 西南交通大学 Study the experimental method of loading condition setting of casing interior insulation moisture distribution

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