CN109884487A - A kind of capacitance type equipment insulation monitoring mobile device - Google Patents
A kind of capacitance type equipment insulation monitoring mobile device Download PDFInfo
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- CN109884487A CN109884487A CN201910251721.2A CN201910251721A CN109884487A CN 109884487 A CN109884487 A CN 109884487A CN 201910251721 A CN201910251721 A CN 201910251721A CN 109884487 A CN109884487 A CN 109884487A
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Abstract
The invention discloses a kind of capacitance type equipment insulations to monitor mobile device, including cabinet body and the traveling wheel that bottom of cabinet bulk is arranged in, interior of the cabinet space is from top to bottom successively separated into first area, second area and third region, it is equipped with by drawer-type structure for long-term timing detection and by the laptop of data storage and teletransmission in first area, monitoring modular for monitoring capacitance type equipment insulation is installed in second area, the power wire coil of PT drum for accessing PT secondary voltage and the working power for accessing monitoring modular is installed in third region, the p-wire mouth being connected with monitoring modular is arranged in second area side, the line outlet to match with PT drum and power wire coil is respectively set in the two sides in third region.The present invention uses integral structure, it is mutually discrete between each unit when efficiently solving existing monitoring and between signal need cable connection, the problem of when weak signal transmission is easy to be interfered, influences measurement data accuracy.
Description
Technical field
The invention belongs to Electric Power Equipment Insulation monitoring technical fields, monitor and move more particularly, to a kind of capacitance type equipment insulation
Dynamic device.
Background technique
High voltage electric equipment is the important component in electric power, and the safe operation of high voltage electric equipment is to influence power train
It unites safe and stable and economical operation one of principal element, equipment breakdown caused by all kinds of insulation damages is to entire national economy
Huge loss is caused, the safe operation of entire power grid is influenced and jeopardizes the safety of personnel.So high voltage electric equipment is exhausted
Edge situation is most important to the safe operation of power equipment, it is desirable that electric power equipment management department must reinforce insulation of electrical installation
Monitoring and diagnosis are scented a hidden danger in time to ensure the safety of electrical equipment and the person.
The quality of insulation of electrical installation situation determines operation stability, reliability and the economy of equipment.Electrical equipment
The insulation performance comprehensive function by electricity, magnetic, external force and environment etc. in operation, state of insulation can gradually aging, performance
It can gradually decrease, serious or even forfeiture insulation function, still, the aging of insulation is a slowly varying process, many feelings
Under condition, the problem of insulation ag(e)ing and degree can not be directly found at all, but when insulation ag(e)ing is to critical stage, if cannot adopt
Take timely maintenance measure, it is possible to cause electrical equipment that serious failure occurs, and then influence the normal operation of power grid, even
Lead to paroxysmal electrical equipment accident, causes huge directly or indirectly economic loss.
The dielectric loss characteristic of capacitance type equipment be live monitoring main monitoring quantity and fault diagnosis it is main according to it
One.Since the on-line monitoring of capacitance type equipment dielectric loss will receive the influence of environmental factor (temperature, humidity, filth etc.), to setting
The judgement of standby state certainly will be also impacted, causes to judge by accident or fail to judge, thus only know about test voltage, environment temperature, humidity,
After insulating surface soiled condition is to the influence of dielectric loss, live monitoring and fault diagnosis system can really play a role,
The insulation status for grasping running equipment accurately and in time, could set according to judgements such as the monitoring result of equipment and its variation tendencies
The data of standby health status, equipment live monitoring just have practical significance.
By taking capacitive current transformer (CT) as an example, its equivalent electrical mould can be established according to its internal structure and electrical principle
Type is illustrated in figure 7 the equivalent electrical model of CT, in figure: Ic- capacity current；Ir- current in resistance property；R- EFFECTIVE MEDIUM resistance；C- etc.
It is worth capacitor；U- working voltage.
The range of signal span of substation's electricity primary equipment earth leakage current is very big, such as pair of certain capacitance type equipments
For ground leakage current up to hundreds of milliamperes, the earth leakage current signal of certain equipment is very faint, for example certain arresters are normal
When work its leakage current be few tens of microamps, but arrester by system overvoltage (surge, lightning stroke etc.) impact when its is right
Ground leakage current is up to kilo-ampere.
The major technique system that online insulating properties monitoring technology is relied at present has following:
1. Digital Signal Processing, by the development of many decades, application of the Digital Signal Processing in status monitoring field
Comparative maturity；
2. high-precision sensor technology, the application of especially active Zero flux mutual inductor, for letter faint under complex electromagnetic environment
Number process performance have great promotion, at present status monitoring field application also than wide；
3. the high-end hardware based on 32 embedded microprocessor MPU, the digital signal processor DSP framework of 32 floating-point operations
Platform, based on the high-end hardware platform of the frameworks such as ARM, DSP Condition Monitoring Data acquisition, the application in Digital Signal Analysis than
Wide, the third party technology of related hardware and software development environment supports comparative maturity.
The application of the above technology provides powerful technical support for smart grid status monitoring, so that on-line monitoring is more next
More become ensure electric power netting safe running important technical, while but also the maintenance of high voltage electric equipment by past single
Scheduled overhaul to intelligentized repair based on condition of component transition, be that power grid operation management moves towards intensive, scientific developing direction.
While the above technology is applied, the development of on-line monitoring technique also faces many restraining factors, main to show
For following several respects:
1. the performance of sensor largely affects the promotion of on-line monitoring system performance, it is mainly shown as sensor multiple
The integrity problem of long-term work under strays magnetic environment；
2. consistency of the current transformer when detecting small-signal is poor, cause online monitoring data poor repeatability, dispersibility big；
3. poor anti jamming capability, coupling and transmission of the weak signal under complex electromagnetic environment easily cause signal distortion, it is difficult to
Accurately reflect equipment health status.
4. capacitance type equipment insulation monitoring mobile device currently on the market is mostly separate unit portable detector or online
Monitoring device, separate unit portable detector can not carry out monitoring lasting for a long time to equipment, and on-Line Monitor Device flexibility is poor,
It can only be continued to monitor for certain equipment.
The presence of factors above proposes very high requirement to the design of monitoring device structure and sensor module, in conjunction with grinding
The problem of unit processed encounters in concrete engineering application is the number because overvoltage impact leads to sensor degradation in many cases
According to can not acquire, therefore monitoring device structure is developed and safeguard measure is added in the signal sampling circuit of sensor is
It is necessary to.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of monitorings of capacitance type equipment insulation
Mobile device, using integral structure, it is mutually discrete between each unit when efficiently solving existing monitoring and between signal need electricity
The problem of cable connection, weak signal is easy to be interfered, influences measurement data accuracy when transmitting.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of capacitance type equipment insulation monitoring mobile device, it is described including cabinet body and the traveling wheel that the bottom of cabinet bulk is arranged in
Interior of the cabinet space is from top to bottom successively separated into first area, second area and third region, passes through in the first area
Drawer-type structure is equipped with for long-term timing detection and by the laptop of data storage and teletransmission, in the second area
Monitoring modular for monitoring capacitance type equipment insulation is installed, is equipped in the third region for accessing bis- electricity of PT
The PT drum of pressure and the power wire coil of the working power for accessing the monitoring modular, the second area side setting and institute
The p-wire mouth that monitoring modular is connected is stated, the two sides in the third region are respectively set and the PT drum and power wire coil
The line outlet to match.
Further, the monitoring modular includes detection host, voltage cell, current unit, signal conditioning unit, over-voltage
Protection location, over-current protecting unit, the voltage changer of each phase and each phase current sensor, laptop and detection host
Signal interconnection carries out long-term timing detection to the data of monitoring modular and by data storage and teletransmission to realize.
Further, the current sensor of each phase is used to obtain the leakage current signal of each phase of measured capacitance type equipment；
The voltage changer of each phase belongs to the converting unit of bis- reference signals of PT, for obtain voltage reference signal and signal every
From effect；
Over-current protecting unit is to the prime protective separation component for being input to junior's signal processing unit, for passing to each phase current
Overcurrent protection of the leakage current signal that sensor detects before input signal conditioning unit；
Overvoltage protecting unit is to the prime protective separation component for being input to junior's signal processing unit, for becoming to each phase voltage
Overvoltage protection of the voltage reference signal that parallel operation obtains before input signal conditioning unit；
Signal conditioning unit is used to carry out prime amplification, shaping, filtering to the signal received；
Voltage cell is used for the processing of voltage signal precision truing, digital filtering, signal digitized processing；
Current unit is used for the processing of current signal precision truing, digital filtering, signal digitized processing；
It detects host to be used to carry out amplitude, Phase Processing to the signal by voltage cell and current unit input, calculates electric current
Value, voltage value, equivalent capacitance, dielectric loss class relevant parameter.
Further, the cabinet body uses stainless steel full-closed structure, and mutually isolated shielding between internal each region has
Sealing, shielding and anti-interference ability.
Further, the line outlet uses Waterproof connector of cable.
Further, the PT drum uses model RVVP4*0.75m2Shielding annealed copper wire, 120 meters of wire length, line color
For yellow, green, red, black four colors, access PT secondary singal A, B, C, N, the corresponding 5 core aerial plug-in units in monitoring modular end are respectively corresponded.
Further, the power wire coil uses cable model for RVVP2*1.0m2Shielding annealed copper wire, 120 meters of wire length.
Further, the cabinet body upper outside setting is fluted, is provided with handrail in the groove.
The beneficial effects of the present invention are:
It is discrete that the present invention is directed to current use monitoring device each unit, and signal needs are mutually between each unit when on-the-spot test
The disadvantages of cable connection, weak signal is easy to be interfered, influences measurement data accuracy when transmitting, provide a kind of capacitance type equipment
Insulating monitoring mobile device, including cabinet body and the traveling wheel that bottom of cabinet bulk is arranged in, interior of the cabinet space is from top to bottom successively divided
It is divided into first area, second area and third region, is equipped in first area by drawer-type structure and is examined for long-term timing
It surveys and by the laptop of data storage and teletransmission, the prison for monitoring capacitance type equipment insulation is installed in second area
Module is surveyed, the PT drum for accessing PT secondary voltage and the working power for accessing monitoring modular are installed in third region
Power wire coil, the p-wire mouth that is connected with monitoring modular is arranged in second area side, and the two sides in third region are set respectively
Set the line outlet to match with PT drum and power wire coil.
Wherein, monitoring modular includes detection host, voltage cell, current unit, signal conditioning unit, overvoltage protection list
Member, over-current protecting unit, the voltage changer of each phase and each phase current sensor, laptop and detection host signal it is mutual
Connection carries out long-term timing detection to the data of monitoring modular and by data storage and teletransmission to realize.
In addition, the current sensor of each phase is used to obtain the leakage current signal of each phase of measured capacitance type equipment；Each phase
Voltage changer belongs to the converting unit of bis- reference signals of PT, for obtaining voltage reference signal and signal isolation effect；It crosses
Stream protection location is to the prime protective separation component for being input to junior's signal processing unit, for examining to each phase current sensor
Overcurrent protection of the leakage current signal measured before input signal conditioning unit；Overvoltage protecting unit be to be input to junior letter
The prime protective separation component of number processing unit, the voltage reference signal for obtaining to each phase voltage converter is in input signal
Overvoltage protection before conditioning unit；Signal conditioning unit is used to carry out prime amplification, shaping, filtering to the signal received；Electricity
Unit is pressed to be used for the processing of voltage signal precision truing, digital filtering, signal digitized processing；Current unit is used to believe electric current
Number precision truing processing, digital filtering, signal digitized processing；Host is detected to be used for by voltage cell and current unit input
Signal carry out amplitude, Phase Processing, calculate current value, voltage value, equivalent capacitance, dielectric loss class relevant parameter.
It is discrete that the present invention can eliminate current used monitoring device each unit, signal between each unit when on-the-spot test
Need mutual cable connection, the disadvantages of weak signal is easy to be interfered, influences measurement data accuracy when transmitting, this mobile monitoring
Device becomes one sample of signal sensor, current unit, voltage cell, monitoring host, and when measurement only need to be by tested letter
Number, reference voltage signal, working power be introduced into mobile monitoring device, can be realized to running capacitance type equipment carry out band
Pyroelectric monitor.
The present invention also solves the problems, such as following several respects for ordinary sensors:
1. the communication between data collection system and sensor；
2. realizing the protection in signal sampling circuit by the way of program control hardware isolation；
3. increasing sampling protection control program module in data collection system.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Fig. 1 is the structure of the main view of the first embodiment of the invention；
Fig. 2 is the structure left view schematic diagram of the first embodiment of the invention；
Fig. 3 is the structural block diagram of monitoring modular in the present invention；
Fig. 4 is the structure of the main view of second of embodiment of the invention；
Fig. 5 is signal sampling and protection control loop in the present invention；
Fig. 6 uses wiring diagram for of the invention；
Fig. 7 is the equivalent electrical model of CT.
Specific embodiment
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.It should manage
Solution, in order to enable technical solution is definitely, " front, back, left, right, up, down " used herein etc. indicates that the term in orientation is
Relative to the term position of Fig. 1, not because of the conversion changing location form of presentation of view.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
Personnel's every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment 1:
As shown in Figure 1, Figure 2 and Figure 3, a kind of capacitance type equipment insulation monitors mobile device, including cabinet body 1 and setting in the cabinet
The traveling wheel 2 of 1 bottom of body, 1 inner space of cabinet body are from top to bottom successively separated into first area 3, second area 4 and third
Region 5 is equipped in the first area 3 by drawer-type structure and is detected for long-term timing and by data storage and teletransmission
Laptop 6 is equipped with the monitoring modular 7 for monitoring capacitance type equipment insulation, the third in the second area 4
The electricity of PT drum 8 for accessing PT secondary voltage and the working power for accessing the monitoring modular 7 is installed in region 5
The p-wire mouth 10 being connected with the monitoring modular 7, the third region 5 is arranged in source drum 9,4 side of second area
Two sides the line outlet 11 to match with the PT drum 8 and power wire coil 9 is respectively set.
The monitoring modular 7 includes detection host 71, voltage cell 72, current unit 73, signal conditioning unit 74, over-voltage
Protection location 75, over-current protecting unit 76, the voltage changer 77 of each phase and each phase current sensor 78, laptop 6
It is interconnected with detection 71 signal of host to realize that the data to monitoring modular 7 carry out long-term timing detection and by data storage and far
It passes.
The current sensor 78 of each phase is used to obtain the leakage current signal of each phase of measured capacitance type equipment；
The voltage changer 77 of each phase belongs to the converting unit of bis- reference signals of PT, for obtaining voltage reference signal and signal
Buffer action；
Over-current protecting unit 76 is to the prime protective separation component for being input to junior's signal processing unit, for each phase current
Overcurrent protection of the leakage current signal that sensor detects before input signal conditioning unit 74；
Overvoltage protecting unit 75 is to the prime protective separation component for being input to junior's signal processing unit, for each phase voltage
Overvoltage protection of the voltage reference signal that converter obtains before input signal conditioning unit 74；
Signal conditioning unit 74 is used to carry out prime amplification, shaping, filtering to the signal received；
Voltage cell 72 is used for the processing of voltage signal precision truing, digital filtering, signal digitized processing；
Current unit 73 is used for the processing of current signal precision truing, digital filtering, signal digitized processing；
Detection host 71 is used to carry out amplitude, Phase Processing to the signal inputted by voltage cell 72 and current unit 73, calculates
Current value, voltage value, equivalent capacitance, dielectric loss class relevant parameter out.
Signal sampling and protection control are the key Design of intelligence sensor, signal sampling and protection control loop such as Fig. 5
It is shown, the hardware isolated of signal sample circuit and mutual inductor secondary side is realized by intermediate relay K1 and K2.Intermediate relay
The movement of K1 and K2 is realized by current unit and is controlled that specific control instruction is issued by host computer data collection system, passes through bus
It realizes the communication with current unit, and exports control signal after realizing instruction decoding by current unit.General control process is to be
Mutual inductor secondary singal input sampling circuit during system acquisition data, mutual inductor secondary singal and sample circuit during system is idle
It realizes isolation, so that sensor leads to sensor degradation from the impact of the overvoltage such as surge, lightning stroke, reaches raising system
The purpose of operational reliability.
As shown in fig. 6, using wiring diagram for a kind of capacitance type equipment insulation monitoring mobile device of the present invention.
Embodiment 2:
As shown in figure 4, itself the difference from embodiment 1 is that: 1 upper outside of cabinet body setting fluted 12, the groove 12
Inside it is provided with handrail 13.
Embodiment 3:
Itself the difference from example 2 is that: the cabinet body 1 uses stainless steel full-closed structure, between internal each region mutually every
Off screen is covered, and has sealing, shielding and anti-interference ability.
Embodiment 4:
The difference of itself and embodiment 3 is: the line outlet 11 uses Waterproof connector of cable.
Embodiment 5:
The difference of itself and embodiment 4 is: the PT drum 8 uses model RVVP4*0.75m2Shielding annealed copper wire, wire length
120 meters, line color is yellow, green, red, black four colors, respectively corresponds access PT secondary singal A, B, C, N, corresponding 5 cores in 7 end of monitoring modular
Aerial plug-in unit.
Embodiment 6:
The difference of itself and embodiment 5 is: the power wire coil 9 uses cable model for RVVP2*1.0m2Shielding annealed copper wire,
120 meters of wire length.
The present invention is by organic collection of assembly of elements such as voltage changer, current sensor, detection host, signal conditioning units
The capacitance type equipment insulation for being integrally formed monitors mobile device.
In the present invention, current sensor is sent into current detecting unit, bus two after sampling capacitance type equipment leakage current
Secondary voltage is linked into voltage detection unit, and current detecting unit is synchronous with voltage detection unit to carry out signal to handle and count sonization
Detection host is sent into after processing, host handles signal amplitude, phase, calculate current value, voltage value, equivalent capacitance,
The parameters such as dielectric loss.
Additional advantage of the present invention is integrated level height, and high reliablity, conveniently moving, rain proofness is good, easy to operate, anti-interference energy
Power is strong, can be placed in field automatic measurement or manual intervention measurement for a long time.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (8)
1. a kind of capacitance type equipment insulation monitors mobile device, including cabinet body and the traveling wheel that the bottom of cabinet bulk is arranged in,
Be characterized in that: the interior of the cabinet space is from top to bottom successively separated into first area, second area and third region, and described
It is equipped with by drawer-type structure for long-term timing detection and by the laptop of data storage and teletransmission, institute in one region
The monitoring modular being equipped in second area for monitoring capacitance type equipment insulation is stated, is equipped with and is used in the third region
Access the PT drum of PT secondary voltage and the power wire coil of the working power for accessing the monitoring modular, the second area
The p-wire mouth being connected with the monitoring modular is arranged in side, and the two sides in the third region are respectively set and the PT line
The line outlet that disk and power wire coil match.
2. a kind of capacitance type equipment insulation according to claim 1 monitors mobile device, it is characterised in that: the monitoring mould
Block includes detection host, voltage cell, current unit, signal conditioning unit, Overvoltage protecting unit, over-current protecting unit, each phase
Voltage changer and each phase current sensor, laptop and detection host signal interconnection to realize to monitoring modular
Data carry out long-term timing detection and by data storages and teletransmission.
3. a kind of capacitance type equipment insulation according to claim 2 monitors mobile device, it is characterised in that: the electric current of each phase
Sensor is used to obtain the leakage current signal of each phase of measured capacitance type equipment；
The voltage changer of each phase belongs to the converting unit of bis- reference signals of PT, for obtain voltage reference signal and signal every
From effect；
Over-current protecting unit is to the prime protective separation component for being input to junior's signal processing unit, for passing to each phase current
Overcurrent protection of the leakage current signal that sensor detects before input signal conditioning unit；
Overvoltage protecting unit is to the prime protective separation component for being input to junior's signal processing unit, for becoming to each phase voltage
Overvoltage protection of the voltage reference signal that parallel operation obtains before input signal conditioning unit；
Signal conditioning unit is used to carry out prime amplification, shaping, filtering to the signal received；
Voltage cell is used for the processing of voltage signal precision truing, digital filtering, signal digitized processing；
Current unit is used for the processing of current signal precision truing, digital filtering, signal digitized processing；
It detects host to be used to carry out amplitude, Phase Processing to the signal by voltage cell and current unit input, calculates electric current
Value, voltage value, equivalent capacitance, dielectric loss class relevant parameter.
4. a kind of capacitance type equipment insulation according to claim 3 monitors mobile device, it is characterised in that: the cabinet body is adopted
With stainless steel full-closed structure, mutually isolated shielding between internal each region has sealing, shielding and anti-interference ability.
5. a kind of capacitance type equipment insulation according to claim 4 monitors mobile device, it is characterised in that: the line outlet
Using Waterproof connector of cable.
6. a kind of capacitance type equipment insulation according to claim 5 monitors mobile device, it is characterised in that: the PT drum
Using model RVVP4*0.75m2Shielding annealed copper wire, 120 meters of wire length, line color be yellow, green, red, black four colors, respectively correspond and connect
Enter PT secondary singal A, B, C, N, the corresponding 5 core aerial plug-in units in monitoring modular end.
7. a kind of capacitance type equipment insulation according to claim 6 monitors mobile device, it is characterised in that: the power supply line
Disk uses cable model for RVVP2*1.0m2Shielding annealed copper wire, 120 meters of wire length.
8. a kind of capacitance type equipment insulation according to any one of claims 1 to 7 monitors mobile device, it is characterised in that:
The cabinet body upper outside setting is fluted, is provided with handrail in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910251721.2A CN109884487A (en) | 2019-03-29 | 2019-03-29 | A kind of capacitance type equipment insulation monitoring mobile device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910251721.2A CN109884487A (en) | 2019-03-29 | 2019-03-29 | A kind of capacitance type equipment insulation monitoring mobile device |
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| CN109884487A true CN109884487A (en) | 2019-06-14 |
Family
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| CN201910251721.2A Pending CN109884487A (en) | 2019-03-29 | 2019-03-29 | A kind of capacitance type equipment insulation monitoring mobile device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113064013A (en) * | 2021-03-31 | 2021-07-02 | 广东电网有限责任公司 | Lightning arrester state monitoring method, device and system |
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| CN2718591Y (en) * | 2004-05-17 | 2005-08-17 | 西安交通大学 | Dielectric loss on-line monitoring device for capacitive electric equipment |
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| CN204989396U (en) * | 2015-04-02 | 2016-01-20 | 江西仪能新能源微电网协同创新有限公司 | Multi -functional insulating property live test appearance |
| CN205539337U (en) * | 2016-04-03 | 2016-08-31 | 国网山东省电力公司巨野县供电公司 | A resonance device for transformer substation |
| CN106817869A (en) * | 2017-02-27 | 2017-06-09 | 郑州云海信息技术有限公司 | A kind of removable integrated testing platform |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29702053U1 (en) * | 1997-02-06 | 1997-03-27 | Kb Knecht Gmbh | Computer cabinet |
| CN2718591Y (en) * | 2004-05-17 | 2005-08-17 | 西安交通大学 | Dielectric loss on-line monitoring device for capacitive electric equipment |
| CN202421421U (en) * | 2011-11-30 | 2012-09-05 | 北京光耀电力自动化有限公司 | Insulating-performance online monitoring device of capacitive high-voltage electrical equipment |
| CN202433486U (en) * | 2012-01-06 | 2012-09-12 | 武汉英康铁路电气设备工程有限公司 | Online insulation monitoring device of high-voltage equipment of traction substation |
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| CN113064013A (en) * | 2021-03-31 | 2021-07-02 | 广东电网有限责任公司 | Lightning arrester state monitoring method, device and system |
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Application publication date: 20190614 |
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