CN106841959A - For the intelligent high frequency local discharge sensor of power cable Partial Discharge Detection - Google Patents
For the intelligent high frequency local discharge sensor of power cable Partial Discharge Detection Download PDFInfo
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- CN106841959A CN106841959A CN201710221654.0A CN201710221654A CN106841959A CN 106841959 A CN106841959 A CN 106841959A CN 201710221654 A CN201710221654 A CN 201710221654A CN 106841959 A CN106841959 A CN 106841959A
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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
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Abstract
A kind of intelligent high frequency local discharge sensor for power cable Partial Discharge Detection, including metal shielding box, lid, hinge, hasp, insulating washer, magnetic core, surface-mounted integrated circuit, supply hub, signal transmitting antenna, battery, power switch and indicator lamp；Inventive sensor internal battery and surface-mounted integrated circuit, can directly carry out the treatment of signal in sensor, reduce the decay in signals transmission, improve sensitivity and the antijamming capability of sensor；Built-in surface-mounted integrated circuit includes wireless transmission circuit, terminal receiving device is sent the data to by signal transmitting antenna, connection cables are eliminated, workflow is simplified, and can more at a distance carry out Partial Discharge Detection work, it is ensured that the personal safety of testing staff；It is in pincer structure that whole sensor is launched by described hinge, by hasp connection it is integral after, the circuit of sensor internal could connect work, and when hasp disconnects, battery is separated with circuit board, and sensor is stopped.
Description
Technical field
The present invention relates to power cable, particularly a kind of intelligent high frequency for power cable Partial Discharge Detection is locally put
Electric transducer.
Background technology
With the requirement developed rapidly with urban planning of China's large- and-medium size cities construction, conventional outskirts of a town overhead transmission line shows
Also slowly exited the stage of history, and be layed in the power cable of underground with its occupation of land less, to personal safety, power supply can
By, maintenance workload is small many advantages, such as, acquired and be widely applied.With the extensive use of power cable, cable operation
In failure problems just increasingly display.In order to ensure the reliability and security of power supply, live detection is carried out to cable,
The running status for grasping cable in time is just particularly important, and particularly cable local discharge detection technique becomes power industry
Study hotspot.With the continuous growth of urban distribution network power load, the probability of malfunction of power cable is also greatly increased, and carries out electricity
The detection of power cable local discharge has great importance to ensureing the safe and stable operation of power system.
The detection method for local discharge of current power cable mainly has high-frequency electromagnetic coupled method, superfrequency method, ultrasonic wave to examine
Survey method etc..When power cable shelf depreciation is detected using superfrequency, supercritical ultrasonics technology, due to electromagnetic wave and ultrasonic signal propagation
The reason for decay, actually active detection range very little is only limitted to cable accessory, additionally, the running environment complexity of power cable,
Interference problem is very prominent.The noises such as mobile phone signal, car engine ignition, mechanical oscillation all can be to superfrequency method, ultrasonic wave
The degree of accuracy of detection method produces serious negative effect.Therefore, cable local discharge detection at present is main to use broadband electromagnetical coupling
It is legal.
Using broadband electromagnetical coupled method detect cable local discharge signal when, predominantly detect be flow through cable body or
The high-frequency pulse current signal of cable grounding line.During actually detected, high frequency partial discharge sensor is socketed in cable sheet
On the ground wire of body or cable, conditioning unit or detector main frame are connected by cable.For many occasions, such as cable shaft tower,
Cable tunnel, cable shaft, cable duct etc., sensor are distant with the connection of subsequent cell, and wiring is complicated, and general cable is difficult
To meet requirement, additionally, the length of cable is more long, and that signal can be caused to decay during propagation is larger, the weight of cable is larger
Also it is easily damaged the interface of sensor and subsequent cell.Above-mentioned situation can be greatly reduced the work of cable scene Partial Discharge Detection
Make efficiency.If running into Devices to test burst assembly accident, due to being directly connected to using cable, testing equipment may be damaged
And jeopardize the personal safety of testing staff.
The content of the invention
In order to solve above-mentioned problem of the prior art, the present invention provides a kind of intelligence for power cable Partial Discharge Detection
Energy high frequency partial discharge sensor, the sensor solves the problems, such as connection cables by wireless transmission, built-in by sensor
Surface-mounted integrated circuit directly carries out signal transacting and extracts characteristic parameter, and issuable decay is asked in solving signals transmission
Topic.
Technical solution of the invention is as follows：
A kind of intelligent high frequency local discharge sensor for power cable Partial Discharge Detection, feature is, including gold
Category shielding box, lid, hinge, hasp, insulating washer, magnetic core, surface-mounted integrated circuit, supply hub, signal transmitting antenna, battery,
Power switch and indicator lamp, the annexation of above-mentioned component are as follows：
Described metal shielding box, lid, insulating washer and magnetic core are constituted by two halves；
Left Semi-shielded box and right Semi-shielded box of the described metal shielding box comprising structure identical semi-circular shape, by closing
Page and hasp connection and it is integral after, box shape is octagonal, and interior is manhole, and an annular cavity type is formed in box body
Body；
Described lid is made up of left half lid and right half lid, and the profile with described metal shielding box matches, box
The profile of lid is octagonal, and interior is manhole, and described left half lid and right half lid has semi-circular shape cavity, covers respectively
On described left Semi-shielded box and right Semi-shielded box, it is fixed by screws on described metal shielding box；
Described insulating washer is made up of the left insulating washer of structure identical and right insulating washer, is laid on respectively described
The bottom of the annular cavity that left Semi-shielded box and right Semi-shielded box are constituted；
Described magnetic core is made up of left semicircle ring magnetic core and right semi-circle ring magnetic core, is respectively placed at described left insulating washer
On right insulating washer, the wire coil of certain number of turn, the two ends of the coil and institute are wound with described left semicircle ring magnetic core
The surface-mounted integrated circuit stated is connected；
Described surface-mounted integrated circuit is arranged in the left semicircle annular housing of described left half lid, is respectively arranged at two ends with electricity
Pole, described supply hub and signal transmitting antenna are arranged on described left half lid, described supply hub and integrated electricity
Road plate connection, described signal transmitting antenna is also connected with surface-mounted integrated circuit；
Described battery is arranged in the right semi-circle annular housing of right half lid, and described power switch and indicator lamp are installed
On right half lid, the two ends of described battery are respectively first circuit board and second circuit board, and second circuit board is straight with battery
Connect connected, the outer end of first circuit board and second circuit board is provided with electrode；
Described first circuit board, power switch, indicator lamp are mutually contacted successively with described battery, described right half lid
Electrode of the electrode at interior two ends respectively with two ends in described left half lid is connected；
Whole sensor launches to be in pincer structure by described hinge, and entirety is circularized by described hasp connection
Afterwards, two described electrodes are connected simultaneously with two described electrodes, the circuit communication of sensor internal is worked, or carried out to battery
Charge.
The support ring mutually agreed with is provided with for compressing institute at described lid and the edge of the manhole of metal shielding box
The insulating washer stated, described insulating washer is loop configuration with the level.
Epoxy resin is poured in the circle ring chamber of described metal shielding box to protect magnetic core and fixation.
Described surface-mounted integrated circuit includes signal amplification demodulatoring circuit, signal acquisition circuit, wireless transmission circuit and lithium electricity
Pond charging circuit, described signal amplification demodulatoring circuit carries out Linear Amplifer, logarithm inspection to the high frequency partial discharge signal being input into
Ripple, described signal acquisition circuit carries out analog-to-digital conversion to the high frequency partial discharge signal after simulated modulation and characteristic parameter is carried
Take, and described wireless transmission circuit is sent data to by serial communication interface, will by described signal transmitting antenna
Signal transmission gives terminal receiving device；Described lithium battery charging circuit is connected by supply hub external power, completes lithium battery
Charge.
Structure of the present invention has the advantage that：
1st, inventive sensor internal battery and surface-mounted integrated circuit, can directly carry out the treatment of signal in sensor, subtract
Decay in few signals transmission, improves sensitivity and the antijamming capability of sensor；
2nd, the built-in surface-mounted integrated circuit of inventive sensor includes wireless transmission circuit, can wirelessly by number
According to terminal receiving device is sent to, connection cables are eliminated, simplify workflow, and can more at a distance carry out shelf depreciation
Detection work, it is ensured that the personal safety of testing staff；
3rd, inventive sensor generally pincer structure, Devices to test normal work is not influenceed.When sensor is opened, battery
Separated with circuit board, the circuit of sensor internal could connect work during closure, and sensor could be filled during closure
Electricity.
Brief description of the drawings
Fig. 1 is the schematic perspective view of intelligent high frequency sensor.
Fig. 2 is the insulating washer structural representation inside intelligent high frequency sensor shielding box.
Fig. 3 is the core structure schematic diagram inside intelligent high frequency sensor shielding box.
Fig. 4 is lid internal structure schematic diagram.
Fig. 5 is lid structural representation.
Fig. 6 is intelligent high frequency sensor shielding box structural representation.
Fig. 7 is insulating washer structural representation and generalized section.
Specific embodiment
The present invention is further illustrated below by embodiment combination accompanying drawing.
See Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the intelligent high frequency shelf depreciation sensing of power cable Partial Discharge Detection of the present invention
Device, including metal shielding box 1, lid), hinge 3, hasp 4, insulating washer 5, magnetic core 6, surface-mounted integrated circuit 7, supply hub 8, letter
Number transmitting antenna 9, battery 10, power switch 11 and indicator lamp 12, the annexation of above-mentioned component are as follows：
Described metal shielding box 1, lid 2, insulating washer 5 and magnetic core 6 are constituted by two halves；
Left Semi-shielded box 1.1 and right Semi-shielded box of the described metal shielding box 1 comprising structure identical semi-circular shape
1.2, after hinge 3 and hasp 4 are formed by connecting one, box shape is octagonal, and interior is that one is formed in manhole, box body
Individual annular cavity；
Described lid 2 is made up of left half lid 2.1 and right half lid 2.2, the profile phase with described metal shielding box 1
Supporting, the profile of lid is octagonal, and interior is manhole, and described left half lid 2.1 and right half lid 2.2 has semicircular ring
Shape cavity, is covered on described left Semi-shielded box 1.1 and right Semi-shielded box 1.2 respectively, and described gold is fixed on by screw 2.4
On category shielding box 1；
Described insulating washer 5 is made up of the left insulating washer 5.1 of structure identical and right insulating washer 5.2, is laid respectively
The bottom of the annular cavity constituted in described left Semi-shielded box 1.1 and right Semi-shielded box 1.2；
Described magnetic core 6 is made up of left semicircle ring magnetic core 6.1 and right semi-circle ring magnetic core 6.2, is respectively placed at a described left side
On insulating washer 5.1 and right insulating washer 5.2, the wire coil of certain number of turn is wound with described left semicircle ring magnetic core 6.1,
The two ends of the coil are connected with described surface-mounted integrated circuit 7；
Described surface-mounted integrated circuit 7 is arranged in the left semicircle annular housing of described left half lid 2.1, and two ends set respectively
There is electrode 7.1, described supply hub 8 and signal transmitting antenna 9 are arranged on described left half lid 2.1, described power supply
Jack 8 is connected with surface-mounted integrated circuit 7, and described signal transmitting antenna 9 is also connected with surface-mounted integrated circuit (7)；
Described battery 10 is arranged in the right semi-circle annular housing of right half lid 2.2, described power switch 11 and is referred to
Show that lamp 12 is arranged on right half lid 2.2, the two ends of described battery 10 are respectively first circuit board 10.1 and second circuit board
10.2, second circuit board 10.2 is joined directly together with battery 10, first circuit board 10.1 and second circuit board 10.) outer end be provided with
Electrode 10.3；
Described first circuit board 10.1, power switch 11, indicator lamp 12 are mutually contacted successively with described battery 10, described
Right half lid 2.2 in the electrode 7.1 of the electrode 10.3 respectively with two ends in described left half lid 2.1 at two ends connect；
It is in pincer structure that whole sensor is launched by described hinge 3, is connected by described hasp 4 and circularizes entirety
Afterwards, two described electrodes 10.3 are connected simultaneously with two described electrodes 10.3, the circuit communication of sensor internal is worked, or right
Battery 10 is charged.
Hollow cavity is offered in the inner side of lid 2, wherein installing one in the cavity of left lid 2.1 with cavity geometry phase
There is an electrode 7.1 at same surface-mounted integrated circuit 7, circuit board two ends respectively, and cavity bottom has two through holes, are respectively intended to install electricity
Source jack 8 and signal transmitting antenna 9；One piece of battery 10 is laid in the cavity of right lid 2.2, overall battery shape is about annulus
1/3rd, there are first circuit board 10.1 and second circuit board 10.2 in battery two ends respectively, and battery 10 connects together rear group
Into a complete semicircular ring, there is an electrode 10.3 on first circuit board 10.1 and second circuit board 10.2 respectively, in cavity
Bottom offers two through holes, is respectively intended to install power switch 11 and indicator lamp 12.
See Fig. 1, Fig. 2 and Fig. 3, sensor is integrally divided into two parts, the gap of one end is provided with a hinge wherein
3, the gap of the other end is provided with a hasp 4, and hinge 3 and hasp 4 are all fixed on metal shielding box 1 with screw 2.4.
See Fig. 2 and Fig. 3, in the present invention, insulating washer 5 is placed in the inner annular cavity bottom of metal shielding box 1, two and half
The magnetic core 6 of annulus composition is placed on insulating washer 5,5 insulating effects of insulating washer, it is to avoid magnetic core 6 directly connects with shielding box 1
Touch, the wire coil of certain number of turn is wherein wound with magnetic core 6.1, the two ends of wire coil are connected on surface-mounted integrated circuit 7, peace
After the completion of dress, pouring epoxy resin is protected and fixation to magnetic core 6 in the circle ring chamber of shielding box 1.
See Fig. 4 and Fig. 5, in the present invention, lid 2 is identical with the profile of shielding box 1, and there is a manhole centre, in circle
Through hole edge is provided with support ring 20 for compressing insulating washer 5, in the inner annular cavity of lid 2.1, positioned at chamfered part point
There is not a U-lag to be connected with annular housing, U-lag bottom is slightly above cavity bottom, a screw thread is arranged at the bottom of each U-lag
Hole 2.5, for securing integrated circuit plate 7；Surface-mounted integrated circuit 7 mainly includes signal amplification demodulatoring circuit 7-1, signal acquisition circuit
7-2, wireless transmission circuit 7-3 and lithium battery charging circuit 7-4, wherein, the high frequency office that signal amplification demodulatoring circuit 7-1 will be input into
Portion's discharge signal carries out Linear Amplifer, logarithmic detector, and signal acquisition circuit 7-2 carries out the high frequency partial discharge signal after treatment
Analog-to-digital conversion and characteristic parameter extraction, and wireless transmission circuit 7-3 is sent data to by serial communication interface, by 2.4G
Wireless network transfers signals to terminal receiving device；Lithium battery charging circuit 7-4 completes lithium cell charging function, and for described each
Circuit is powered；
In the present embodiment, the signal amplification demodulatoring circuit 7-1, Linear Amplifer chip is ADL5541, and detection chip is
AD8318；The signal acquisition circuit 7-2, analog-to-digital conversion and Data Management Analysis master chip are STM32L053C8T6；The nothing
Line transtation mission circuit 7-3 uses the wireless WIFI communication modules of XPCW10021；The lithium battery charging circuit 7-4, using BQ24278
It is lithium cell charging chip ,+5V and+3.3V is produced respectively using 2 linear voltage stabilization chip LM317；Described battery 10 is used for
To whole sensor power, electrode 10.3 and electrode 7.1 are corresponded, and after sensor is closed, electrode 10.3 and electrode 7.1 connect
Conducting is touched, battery 10 is powered to surface-mounted integrated circuit 7.In addition, have charging circuit on surface-mounted integrated circuit 7, with supply hub 8
Connection, when the battery of sensor needs to charge, closed sensor, surface-mounted integrated circuit 7 is turned on battery 10, you can by power supply
Jack 8 charges to battery 10, and the two ends of battery 10 connect one piece of circuit board 10.1 and 10.2, power switch 11 and instruction respectively
Lamp 1) all it is connected with circuit board 10.1, power switch 11 is used for controlling the operation of whole sensor and stopping, and indicator lamp 12 is used for
Show the working condition of sensor.
See Fig. 5 and Fig. 6, in the present invention, screw 1.3 is offered on the end face of metal shielding box 1, correspondence is opened on lid 2
Connecting hole 2.3 is provided with, lid 2 is fixed by screw 2.4 is covered on metal shielding box 1, the circle in metal shielding box 1 is led to
Hole edge to annular cavity direction is provided with a support ring, fixed step is correspondingly provided with the interstitial hole edge of insulating washer 5, with shielding box
Support ring 20 in 1 coordinates for fixed insulation packing ring 5.
The present invention is a kind of intelligent high frequency electromagnetic coupled sensor for cable local discharge detection, is the characteristics of maximum
After can processing the local discharge signal that is coupled into sensor, then terminal is transmitted directly to by signal transmitting antenna 9
Receiving device, it is not necessary to connected by cable, very convenient safety, opens hasp 4 during measurement, " sensor is vised into tested electricity
Cable body or cable grounding line " makes it be passed through from the central circular through hole of sensor, is tested by turning on the power switch 11.
Hasp 4 used by the sensor if needing to detect for a long time, can pin hasp with lock with key, refer to Fig. 1.
In the present invention, the metal shielding box 1 is made up of the metal of relatively lightweight, with shielding external electromagnetic interference signal
Effect, is divided into identical two parts, is linked together with hasp 4 using hinge 3, and there are an annular cavity, cavity bottom in inside
An insulating washer 5 is installed in portion, a magnetic core 6 being made up of two semicircular rings is laid on insulating washer 5, wherein on magnetic core 6.1
The wire coil of certain number of turn is wound with, epoxy resin is poured after installation in circle ring chamber, Fig. 2, Fig. 3 and Fig. 6 is referred to.
In the present invention, the magnetic core 6 is circular using high magnetic permeability, the ferromagnetic material of high linearity, rectangular cross-section.
It is one shape same with section of stickup, thickness fixation exhausted on the rectangular cross section of magnetic core 6.2 after magnetic core is diametrically cut
Edge resin flake, so can contain gap in closure in magnetic circuit.Magnetic core size is slightly less than the inner chamber body of shielding box 1, refers to figure
3。
In the present invention, the lid 2 is identical with the material therefor of shielding box 1, and identical with the profile of shielding box 1, and equally
It is divided into identical two parts, the opening surface in shielding box 1 is covered respectively, the effect with shielding external electromagnetic interference signal, wherein
Installation surface-mounted integrated circuit 7 pairs is coupled into the local discharge signal for coming and processes in the internal cavity of lid 2.1, lid 2.2
Battery 10 is installed in internal cavity, whole sensor can be powered, refer to Fig. 4 and Fig. 5.
In the present invention, the material of the insulating washer 5 is that insulating properties are good, and better mechanical property plastics, be divided into phase
Two parts of similar shape, are placed in the bottom of shielding box housing 1, for isolating magnetic core 6 and shielding box housing 1, it is to avoid magnetic core with
The directly contact of shielding box housing 1, refers to Fig. 2 and Fig. 7.
Claims (4)
1. a kind of intelligent high frequency local discharge sensor for power cable Partial Discharge Detection, is characterised by, including metal
Shielding box (1), lid (2), hinge (3), hasp (4), insulating washer (5), magnetic core (6), surface-mounted integrated circuit (7), supply hub
(8), signal transmitting antenna (9), battery (10), power switch (11) and indicator lamp (12), the annexation of above-mentioned component is such as
Under：
Described metal shielding box (1), lid (2), insulating washer (5) and magnetic core (6) are constituted by two halves；
Left Semi-shielded box (1.1) of the described metal shielding box (1) comprising structure identical semi-circular shape and right Semi-shielded box
(1.2), after hinge (3) and hasp (4) are formed by connecting one, box shape is octagonal, and interior is manhole, in box body
Form an annular cavity；
Described lid (2) is made up of left half lid (2.1) and right half lid (2.2), outer with described metal shielding box (1)
Shape matches, and the profile of lid is octagonal, and interior is manhole, and described left half lid (2.1) and right half lid (2.2) are
There is semi-circular shape cavity, cover respectively on described left Semi-shielded box (1.1) and right Semi-shielded box (1.2), by screw (2.4)
It is fixed on described metal shielding box (1)；
Described insulating washer (5) is made up of the left insulating washer of structure identical (5.1) and right insulating washer (5.2), is spread respectively
The bottom of the annular cavity that left Semi-shielded box (1.1) and right Semi-shielded box (1.2) described in being located at are constituted；
Described magnetic core (6) is made up of left semicircle ring magnetic core (6.1) and right semi-circle ring magnetic core (6.2), is respectively placed at described
On left insulating washer (5.1) and right insulating washer (5.2), certain number of turn is wound with described left semicircle ring magnetic core (6.1)
Wire coil, the two ends of the coil are connected with described surface-mounted integrated circuit (7)；
In the left semicircle annular housing of described left half lid (2.1), two ends set described surface-mounted integrated circuit (7) respectively
Have electrode (7.1), described supply hub (8) and signal transmitting antenna (9) on described left half lid (2.1), institute
The supply hub (8) stated is connected with surface-mounted integrated circuit (7), and described signal transmitting antenna (9) also connects with surface-mounted integrated circuit (7)
Connect；
Described battery (10) in the right semi-circle annular housing of right half lid (2.2), described power switch (11) and
Indicator lamp (12) on right half lid (2.2), the two ends of described battery (10) be respectively first circuit board (10.1) and
Second circuit board (10.2), second circuit board (10.2) is joined directly together with battery (10), first circuit board (10.1) and second electricity
The outer end of road plate (10.2) is provided with electrode (10.3)；
Described first circuit board (10.1), power switch (11), indicator lamp (12) are mutually contacted successively with described battery (10),
The electrode (10.3) at the described interior two ends of right half lid (2.2) respectively with the electrode at the described interior two ends of left half lid (2.1)
(7.1) connect；
It is in pincer structure that whole sensor is launched by described hinge (3), is connected by described hasp (4) and circularizes entirety
Afterwards, described two electrodes (10.3) while be connected, make the circuit communication of sensor internal work with described two electrodes (10.3),
Or battery (10) is charged.
2. intelligent high frequency local discharge sensor according to claim 1, is characterised by, in described lid (2) and gold
The edge of the manhole of category shielding box (1) is provided with the support ring mutually agreed with to be used to compress described insulating washer (5), described
Insulating washer (5) is loop configuration with the level.
3. intelligent high frequency local discharge sensor according to claim 1, is characterised by, in described metal shielding box
(1) epoxy resin is poured in circle ring chamber to protect and fixation magnetic core (6).
4. intelligent high frequency local discharge sensor according to claim 1, is characterised by, described surface-mounted integrated circuit (7)
Mainly include signal amplification demodulatoring circuit (7-1), signal acquisition circuit (7-2), wireless transmission circuit (7-3) and lithium cell charging
Circuit (7-4), described signal amplification demodulatoring circuit (7-1) carries out Linear Amplifer, right to the high frequency partial discharge signal being input into
Number detection, described signal acquisition circuit (7-2) carries out analog-to-digital conversion and spy to the high frequency partial discharge signal after simulated modulation
Parameter extraction is levied, and described wireless transmission circuit (7-3) is sent data to by serial communication interface, by described letter
Number transmitting antenna (9) transmits a signal to terminal receiving device；Described lithium battery charging circuit (7-4) passes through supply hub
(8) it is connected with external power, completes lithium cell charging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710221654.0A CN106841959A (en) | 2017-04-06 | 2017-04-06 | For the intelligent high frequency local discharge sensor of power cable Partial Discharge Detection |
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| CN114899724A (en) * | 2022-05-08 | 2022-08-12 | 国网安徽省电力有限公司潜山市供电公司 | Protection device of looped netowrk cabinet |
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| CN110596551A (en) * | 2019-09-27 | 2019-12-20 | 国网浙江省电力有限公司电力科学研究院 | Partial discharge detection sensor |
| CN114899724A (en) * | 2022-05-08 | 2022-08-12 | 国网安徽省电力有限公司潜山市供电公司 | Protection device of looped netowrk cabinet |
| CN117192311A (en) * | 2023-11-06 | 2023-12-08 | 国网天津市电力公司电力科学研究院 | Discharge detection device and method |
| CN117192311B (en) * | 2023-11-06 | 2024-05-24 | 国网天津市电力公司电力科学研究院 | Discharge detection device and method |
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Application publication date: 20170613 |