CN108427068A - A kind of partial discharge of switchgear detection device and method - Google Patents
A kind of partial discharge of switchgear detection device and method Download PDFInfo
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- CN108427068A CN108427068A CN201810273133.4A CN201810273133A CN108427068A CN 108427068 A CN108427068 A CN 108427068A CN 201810273133 A CN201810273133 A CN 201810273133A CN 108427068 A CN108427068 A CN 108427068A
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- partial discharge
- switchgear
- signal extraction
- signal
- detection device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
Abstract
The invention discloses a kind of partial discharge of switchgear detection device and method, which includes：Ceramic condenser core insulation, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, wherein：The charge indicating device includes electrification indicating circuit；The Partial discharge signal extraction element is in parallel with the charge indicating device, and the Partial discharge signal extraction element includes the energy supply capacitance being sequentially connected in series and signal extraction resistance, and partial discharge detection point is equipped between the energy supply capacitance and the signal extraction resistance；It is equipped with coupling capacitor in ceramic condenser core insulation, the ceramic condenser core insulation substring is coupled on the ground wire of the charge indicating device；One end of the partial discharge detection device is electrically connected with the partial discharge detection point, other end ground connection.When measuring Partial discharge signal, it is convenient that the present invention measures, and detection signal is strong, strong antijamming capability.
Description
Technical field
This application involves shelf depreciation live detection technical field more particularly to a kind of partial discharge of switchgear detection devices
And method.
Background technology
Switchgear is a kind of electrical equipment, and main function is to be generated electricity in electric system, transmitted electricity, the conversion of distribution and electric energy
During, opened and closed, controlled and protected electrical equipment.Switchgear in the process of running, after internal dielectric aging
Shelf depreciation, alternatively referred to as partial discharge will occur.Under shelf depreciation effect, the insulation characterisitic of dielectric will deteriorate step by step to be caused
Electric power accident seriously threatens safe operation and power supply quality and the reliability of electric system.According to statistics, shelf depreciation is to lead
The main reason for causing the deterioration of switchgear dielectric, accounts for 85% or more of switchgear accident.
The technology of partial discharge of switchgear detection is with mainly having detection switch cabinet composition of gases within, ultrasonic measurement and transient state electric
Wave measurement.Wherein, the method for detection switch cabinet composition of gases within, be in monitoring switch cabinet due to shelf depreciation decomposite it is smelly
The components such as oxygen, carbon monoxide, carbon dioxide and dinitrogen pentoxide are the new methods of current switchgear detection shelf depreciation.Ultrasound
Detection switch cabinet partial discharge method is the ultrasonic signal generated by detecting local discharge signal, judges shelf depreciation
It intensity and is positioned.Transient state ground electric wave detection switch cabinet partial discharge method refers to the current traveling wave that shelf depreciation generates
The inner surface for often focusing on switch cabinet body, without being directed through cabinet, fraction passes through the metal shell of switchgear
The liner of seam crossing or gas-insulated switch blazes abroad, while generating an instantaneous voltage-to-ground, passes through the metal of switchgear
Housing outer surface and go down with passing to.The variation of transient state voltage-to-ground on detection switch cabinet shell is relatively suitble to media interior
Electric discharge.
In the method for detection switch cabinet composition of gases within, since switchgear space is larger and is not closed cavity, so
It needs that a large amount of gas sensor is installed, comes the gas component in detection switch cabinet, and the spirit of this method detection shelf depreciation
Sensitivity is relatively low, cannot find faint electric discharge.In ultrasound detection partial discharge of switchgear method, ultrasound detection is typically to hear
Abnormal noise, using the ultrasonic signal of detection shelf depreciation, detection sensitivity is relatively low.Transient state ground electric wave detection switch
Cabinet partial discharge method, i.e., the method for induction of high frequency electric current, is highly prone to external interference signals on sensor metal polar plate
It influences.
Invention content
This application provides a kind of partial discharge of switchgear detection device and methods, to solve existing partial discharge of switchgear
The detection technical problem that medium sensitivity is low, anti-interference ability is weak.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution：
In a first aspect, the embodiment of the invention discloses a kind of partial discharge of switchgear detection device, the detection device packet
It includes：Ceramic condenser core insulation, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, wherein：
The charge indicating device includes electrification indicating circuit；
The Partial discharge signal extraction element is in parallel with the charge indicating device, the Partial discharge signal extraction element include according to
Secondary concatenated energy supply capacitance and signal extraction resistance are equipped with partial discharge inspection between the energy supply capacitance and the signal extraction resistance
Measuring point；
It is equipped with coupling capacitor in ceramic condenser core insulation, the ceramic condenser core insulation substring is coupled to the band
On the ground wire of electric instruction device；
One end of the partial discharge detection device is electrically connected with the partial discharge detection point, other end ground connection.
Preferably, in above-mentioned partial discharge of switchgear detection device, the electrification indicating circuit includes opening of being sequentially connected in series
Close and charge indicator light.
Preferably, in above-mentioned partial discharge of switchgear detection device, the coupling capacitor is no partial discharge coupling capacitor,
The partial discharge starting voltage of the no partial discharge coupling capacitor is more than twice of system nominal voltage, and capacitance is 100pF~1000pF, is situated between
Matter loss factor is less than 1%, and capacitance is varied with temperature less than 20%；The capacitance of the energy supply capacitance is 6nF~200nF.
Preferably, in above-mentioned partial discharge of switchgear detection device, the signal extraction resistance is 0.5~1.5K
Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz；
The signal extraction resistance is 0.5~1.5 Ω, for extracting the switchgear that frequency is 30MHz~300MHz
Local discharge signal；
The signal extraction resistance is 0.05~0.15 Ω, is opening for 300MHz~3000MHz for extracting frequency
Close cabinet local discharge signal；
The signal extraction resistance is 0.005~0.015 Ω, for extracting the switch that frequency is 3GHz~300GHz
Cabinet local discharge signal.
Preferably, it in above-mentioned partial discharge of switchgear detection device, is all provided on the A phases of switchgear, B phases and C phase power cords
There are ceramic condenser core insulation, the Partial discharge signal extraction element and the charge indicating device.
Second aspect, the embodiment of the present application disclose a kind of method for detection of partial discharge of switch cabinet, utilize any of the above-described institute
The partial discharge of switchgear detection device stated, the detection method include：
By disconnecting switch to cut off electrification indicating circuit；
Partial discharge detection device is in turn, electrically connected to the partial discharge detection point in the A phases, B phases and C phase power cords of switchgear, is obtained
Take the Partial discharge signal in the A phases, B phases and C phase power cords of switchgear；
Determine whether partial discharge according to the Partial discharge signal；
By closure switch to restore electrification indicating circuit.
Preferably, in above-mentioned method for detection of partial discharge of switch cabinet, A phases, B phases and the C phase power supplys for obtaining switchgear
Partial discharge signal on line, including：
Ceramic condenser core insulation couples Partial discharge signal to Partial discharge signal extraction element；
Partial discharge signal is converted to voltage pulse signal by the signal extraction resistance in the Partial discharge signal extraction element；
Partial discharge detection device receives and analyzes the voltage pulse signal.
Compared with prior art, the application has the beneficial effect that：
The invention discloses a kind of partial discharge of switchgear detection device and method, which includes ceramic condenser
Core insulation, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, wherein：Ceramic condenser core insulation
Coupling capacitor is inside set, has both the effect of sensor and coupling, A phases, B phases or the C phase power cords of one end connecting switch cabinet, separately
One end is connected with the electrification indicating circuit in charge indicating device, and the electrification indicating circuit other end is connected over the ground, can show open
Close the electrification situation of cabinet.The Partial discharge signal extraction element energy supply in parallel with the charge indicating device, including being sequentially connected in series
Capacitance and signal extraction resistance, energy supply capacitance can provide energy for charge indicating device, and ceramic condenser core insulation is by partial discharge
Signal is coupled to signal extraction resistance, and Partial discharge signal is converted to voltage pulse signal by signal extraction resistance.In energy supply electricity
Hold and is equipped with partial discharge detection point between the signal extraction resistance, one end of the partial discharge detection device and the partial discharge detection point
Electrical connection, other end ground connection.Partial discharge detection device receives and analyzes the voltage pulse signal.In conclusion measuring partial discharge
When signal, it is convenient that the present invention measures, and detection signal is strong, strong antijamming capability.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The application can be limited.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
It can be obtain other attached drawings according to these attached drawings.
Fig. 1 is the basic structure schematic diagram of partial discharge of switchgear detection device provided in an embodiment of the present invention；
Fig. 2 is the usage state diagram of partial discharge of switchgear detection device provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of method for detection of partial discharge of switch cabinet provided in an embodiment of the present invention；
Reference sign：1, ceramic condenser core insulation；2, Partial discharge signal extraction element；21, capacitance is energized；22, believe
Number extraction resistance；23, partial discharge detection point；3, charge indicating device；31, it switchs；32, indicator light is charged；4, partial discharge detection device.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The every other embodiment that art personnel are obtained without making creative work should all belong to the application protection
Range.
Referring to Fig. 1, the basic structure schematic diagram of partial discharge of switchgear detection device provided in an embodiment of the present invention.By scheming
Shown in 1, this detection device includes：Ceramic condenser core insulation 1, Partial discharge signal extraction element 2, charge indicating device 3 and office
Detection device 4 is put, wherein：Coupling capacitor is set in ceramic condenser core insulation 1, has both the effect of sensor and coupling, one
The A phases, B phases or C phase power cords, the other end of connecting switch cabinet is held to connect with the electrification indicating circuit in charge indicating device 3, band
The electric indicating circuit other end is connected over the ground, is capable of the electrification situation of display switch cabinet.The Partial discharge signal extraction element 2 with it is described
Charge indicating device 3 is in parallel, including the energy supply capacitance 21 and signal extraction resistance 22 being sequentially connected in series, and energy supply capacitance 21 can be band
Electric instruction device 3 provides energy, and ceramic condenser core insulation 1 couples Partial discharge signal to signal extraction resistance 22, signal extraction
Partial discharge signal is converted to voltage pulse signal by resistance 22.It is set between the energy supply capacitance 21 and the signal extraction resistance 22
There are partial discharge detection point 23, one end of the partial discharge detection device 4 to be electrically connected with the partial discharge detection point 23, other end ground connection.Office
Detection device 4 is put to receive and analyze the voltage pulse signal.In conclusion when measuring Partial discharge signal, present invention measurement side
Just, detection signal is strong, strong antijamming capability.
Specifically, traditional ceramic condenser core insulation does not have a coupling function, ceramic condenser core insulation in the application
Coupling capacitor is set in son, has both the effect of sensor and coupling, since detection device is connected to high voltage bus in the application
On, electrification indicating circuit and Partial discharge signal part of detecting required voltage are relatively low, therefore pass through the ceramic condenser core in the application
Insulator 1 is coupled to Partial discharge signal extraction element 2 to being depressured on high voltage bus, and by Partial discharge signal.
Partial discharge signal extraction element 2 in the embodiment of the present application has both the function of energy supply and Partial discharge signal extraction.Ceramic electrical
Hold core insulation 1 and couples Partial discharge signal to Partial discharge signal extraction element 2, the signal extraction electricity in Partial discharge signal extraction element 2
Resistance 22 can convert Partial discharge signal to voltage pulse signal；Energy supply capacitance 21 can be that electrification indicator light 32 provides energy, protect
The normal work of card electrification indicator light 32.
Further, the electrification indicating circuit includes the switch 31 being sequentially connected in series and electrification indicator light 32.Using this hair
When partial discharge of switchgear detection device in bright, switch 31 is disconnected first, electrification indicating circuit is avoided to play test loop
To shunting function.In addition, the detection of Partial discharge signal needs in conductive environment, therefore the application is according to electrification indicator light 32
It is bright or go out judge system whether be in conductive environment.
In order to optimize above-mentioned technical proposal, the coupling capacitor is no partial discharge coupling capacitor, the no partial discharge coupling
The partial discharge inception voltage of capacitor is more than twice of system nominal voltage, and capacitance is 100pF~1000pF, dielectric dissipation factor
Less than 1%, capacitance is varied with temperature less than 20%.Above-mentioned no partial discharge coupling capacitor can effectively take out shelf depreciation letter
Number, if the internal capacitance amount of ceramic condenser core insulation varies with temperature larger, it is unfavorable for coupleeing Partial discharge signal to partial discharge
Signal extracting device 2.The capacitance of the energy supply capacitance 21 is 6nF~200nF, by ceramic condenser core insulation 1 under power-frequency voltage
It is divided with energy supply capacitance 21 so that the voltage after dividing is suitable for the electrification indicating circuit, lights electrification indicator light 32.
The local discharge signal that detection device in the application is suitable for switchgear is low frequency (30KHz~300KHz), very
The frequency of high frequency (30MHz~300MHz), superfrequency (300MHz~3000MHz) and hyperfrequency (3GHz~300GHz), no
With in different frequency ranges, the resistance value of signal extraction resistance 22 is different.When 22 resistance value of signal extraction resistance is
When 0.5~1.5K Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz；When the signal extraction
When 22 resistance value of resistance is 0.5~1.5 Ω, for extracting the partial discharge of switchgear signal that frequency is 30MHz~300MHz；Work as institute
State 22 resistance value of signal extraction resistance be 0.05~0.15 Ω when, for extract frequency be 300MHz~3000MHz switchgear office
Portion's discharge signal；When 22 resistance value of signal extraction resistance be 0.005~0.015 Ω when, for extract frequency be 3GHz~
The partial discharge of switchgear signal of 300GHz.
Referring to Fig. 2, the usage state diagram of partial discharge of switchgear detection device provided in an embodiment of the present invention, Fig. 2 be etc.
The three-phase electrical power system of effect.Cax, Cbx, Ccx are equivalent capacity of the dielectric under partial discharge effect in switchgear in figure.It opens
It closes and is equipped with ceramic condenser core insulation 1,2 and of Partial discharge signal extraction element in the A phases, B phases and C phase power cords of cabinet
The charge indicating device 3.When needing A phases in detection switch cabinet, B phases and C phase power cords to whether there is partial discharge phenomenon,
Partial discharge detection device 4 can be connect and be surveyed with the partial discharge detection point 23 under the A phases of switchgear, B phases and C phase power cords successively
Examination.
Corresponding with above-mentioned realization detection device, the embodiment of the present invention additionally provides a kind of partial discharge of switchgear detection
Method.Referring to Fig. 3, the flow diagram of method for detection of partial discharge of switch cabinet provided in an embodiment of the present invention.It can in conjunction with Fig. 3
Know, this method includes：
Step 101, by disconnecting switch to cut off electrification indicating circuit；
Switch 31 is disconnected, cuts off electrification indicating circuit, avoiding electrification indicating circuit, there are distributary phenomena, to follow-up test office
Result is put to have an impact.
Step 102, partial discharge partial discharge detection device being in turn, electrically connected in the A phases, B phases and C phase power cords of switchgear
Test point obtains the Partial discharge signal in the A phases, B phases and C phase power cords of switchgear；
Ceramic condenser core insulation 1 couples Partial discharge signal to Partial discharge signal extraction element 2, the Partial discharge signal extraction dress
Partial discharge signal is converted to voltage pulse signal by the signal extraction resistance 22 set in 2, and the partial discharge detection device 4 is received and analyzed
The voltage pulse signal.
Step 103, partial discharge is determined whether according to the Partial discharge signal；
The partial discharge detection device 4 receives and the voltage pulse signal is processed into the apparent for indicating local discharge characteristic
Discharge capacity etc., and include on the display screen of partial discharge detection device 4 by above-mentioned data.According to the display knot of partial discharge detection device 4
Fruit judges whether partial discharge phenomenon.
Step 104, by closure switch to restore electrification indicating circuit.
Closure switch 31, after restoring electrification indicating circuit, energy supply capacitance 21 can continue to provide for electrification indicator light 32
Energy judges whether switchgear is powered by charging indicator light 32 bright or going out.
Since embodiment of above is that reference combination illustrates on other modes, have between different embodiments
There is an identical part, just to refer each other for identical, similar part between each embodiment in this specification.Herein no longer in detail
It illustrates.
It should be noted that in the present specification, the relational terms of such as " first " and " second " or the like are used merely to
It distinguishes one entity or operation from another entity or operation, and not necessarily requires or imply these entities or operation
Between there are any this actual relationship or sequences.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that circuit structure, article or equipment including a series of elements include not only those
Element, but also include other elements that are not explicitly listed, or further include for this circuit structure, article or equipment
Intrinsic element.In the absence of more restrictions, there is the element that sentence "including a ..." limits, it is not excluded that
There is also other identical elements in circuit structure, article or equipment including the element.
Those skilled in the art will readily occur to its of the application after considering specification and putting into practice the disclosure invented here
His embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the application and includes the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection domain.
Claims (7)
1. a kind of partial discharge of switchgear detection device, which is characterized in that the detection device includes：Ceramic condenser core insulation
(1), Partial discharge signal extraction element (2), charge indicating device (3) and partial discharge detection device (4), wherein：
The charge indicating device (3) includes electrification indicating circuit；
The Partial discharge signal extraction element (2) is in parallel with the charge indicating device (3), the Partial discharge signal extraction element (2)
Including the energy supply capacitance (21) being sequentially connected in series and signal extraction resistance (22), in the energy supply capacitance (21) and the signal extraction
Partial discharge detection point (23) is equipped between resistance (22)；
Coupling capacitor is equipped in the ceramic condenser core insulation (1), the ceramic condenser core insulation (1) is series at described
On the ground wire of charge indicating device (3)；
One end of the partial discharge detection device (4) is electrically connected with the partial discharge detection point (23), other end ground connection.
2. partial discharge of switchgear detection device according to claim 1, which is characterized in that the electrification indicating circuit packet
Include the switch (31) being sequentially connected in series and electrification indicator light (32).
3. partial discharge of switchgear detection device according to claim 1, which is characterized in that the coupling capacitor is nothing
The partial discharge starting voltage of partial discharge coupling capacitor, the no partial discharge coupling capacitor is more than twice of system nominal voltage, and capacitance is
100pF~1000pF, dielectric dissipation factor are less than 1%, and capacitance is varied with temperature less than 20%；The energy supply capacitance (21)
Capacitance is 6nF~200nF.
4. partial discharge of switchgear detection device according to claim 1, which is characterized in that the signal extraction resistance
(22) resistance value is 0.5~1.5K Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz；
Signal extraction resistance (22) resistance value is 0.5~1.5 Ω, for extracting the switchgear that frequency is 30MHz~300MHz
Local discharge signal；
Signal extraction resistance (22) resistance value is 0.05~0.15 Ω, is opening for 300MHz~3000MHz for extracting frequency
Close cabinet local discharge signal；
Signal extraction resistance (22) resistance value is 0.005~0.015 Ω, for extracting the switch that frequency is 3GHz~300GHz
Cabinet local discharge signal.
5. partial discharge of switchgear detection device according to claim 1, which is characterized in that A phases, B phases and the C of switchgear
The ceramic condenser core insulation (1), the Partial discharge signal extraction element (2) and electrification instruction are equipped on phase power cord
Device (3).
6. a kind of method for detection of partial discharge of switch cabinet is detected using any partial discharge of switchgear of claim 1-5
Equipment, which is characterized in that the detection method includes：
By disconnecting switch to cut off electrification indicating circuit；
Partial discharge detection device is in turn, electrically connected to the partial discharge detection point in the A phases, B phases and C phase power cords of switchgear, acquisition is opened
Close the Partial discharge signal in the A phases, B phases and C phase power cords of cabinet；
Determine whether partial discharge according to the Partial discharge signal；
By closure switch to restore electrification indicating circuit.
7. method for detection of partial discharge of switch cabinet according to claim 6, which is characterized in that the A for obtaining switchgear
Partial discharge signal on phase, B phases and C phase power cords, including：
Ceramic condenser core insulation couples Partial discharge signal to Partial discharge signal extraction element；
Partial discharge signal is converted to voltage pulse signal by the signal extraction resistance in the Partial discharge signal extraction element；
Partial discharge detection device receives and analyzes the voltage pulse signal.
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| CN201810273133.4A CN108427068A (en) | 2018-03-29 | 2018-03-29 | A kind of partial discharge of switchgear detection device and method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108445360A (en) * | 2018-03-29 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge of switchgear positioning device and method |
| CN109085475A (en) * | 2018-09-14 | 2018-12-25 | 北京鼎诚恒安科技发展有限责任公司 | The detection method and device of high-tension switch cabinet shelf depreciation |
| CN109596954A (en) * | 2018-12-26 | 2019-04-09 | 国网北京市电力公司 | The detection method and device of partial discharge of switchgear |
| CN110161383A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of detection device for partial discharge of switch cabinet |
| CN110161385A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of electrification instruction partial discharge of switchgear signal detection apparatus |
| CN110161384A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | The Partial discharge signal extraction element and method in instruction circuit are charged with LC parallel resonance |
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| CN110988614A (en) * | 2019-11-12 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Ring main unit electric pulse partial discharge coupling capacitance sensor |
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| CN112881866A (en) * | 2021-01-11 | 2021-06-01 | 云南电网有限责任公司临沧供电局 | Partial discharge monitoring overvoltage suppression method and device |
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| CN110988614A (en) * | 2019-11-12 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Ring main unit electric pulse partial discharge coupling capacitance sensor |
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| CN111239663A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Partial discharge online calibration method |
| CN111239560A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Multi-sensor-based partial discharge positioning method |
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