CN209640448U - Station class ultrasonic partial discharge and humiture monitoring device - Google Patents
Station class ultrasonic partial discharge and humiture monitoring device Download PDFInfo
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- CN209640448U CN209640448U CN201920192083.7U CN201920192083U CN209640448U CN 209640448 U CN209640448 U CN 209640448U CN 201920192083 U CN201920192083 U CN 201920192083U CN 209640448 U CN209640448 U CN 209640448U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 76
- 239000002184 metal Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 16
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims description 28
- 239000000523 sample Substances 0.000 claims description 7
- 238000002604 ultrasonography Methods 0.000 claims description 6
- 239000011358 absorbing material Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model discloses station class ultrasonic partial discharge and humiture monitoring devices, including pedestal, the first support plate, the first push plate, the second support plate, crushing block, internal screw thread bar, the second support frame and ultrasonic partial discharge monitoring device；Left side above the pedestal is provided with first sliding groove, and the first sliding block is provided in first sliding groove, the first mounting base is provided with above the first sliding block；Centre above second support plate is provided with the first thread bush, and spring is provided with the second push plate far from the side of ultrasonic partial discharge monitoring device, is arranged in second sliding slot below the first push plate and the second push plate.The utility model is used cooperatively by the first threaded rod of setting and first thread bush, crushing block is driven to move down, crushing block squeezes the first push plate and metal clips, installation fixation can be carried out to temperature monitoring device, humidity detection device and ultrasonic partial discharge monitoring device respectively, structure is simple, convenient disassembly.
Description
Technical field
The utility model relates to ultrasonic partial discharges to monitor field, specifically station class ultrasonic partial discharge and temperature-humidity monitoring dress
It sets.
Background technique
Shelf depreciation refers to generation between the electrodes but the not electric discharge of penetrating electrode, it is since apparatus insulated inside is deposited
Defect caused by light current or production process, there is a phenomenon where repeat to puncture and extinguish under high electric-field intensity effect.Ultrasound
Wave partial discharge monitoring device can monitor running device failure, vibration, high-frequency signal caused by leakage and electric partial discharge, surpass
The high frequency noise that sound wave partial discharge monitoring device is generated by monitoring this phenomenon utilizes " heterodyne method " to compile it as human ear audible
Voice signal.Existing major part ultrasonic partial discharge monitoring device is general and humiture monitoring device is used cooperatively, and current
Most ultrasonic partial discharge and the most mounting structure of humiture monitoring device are complicated, inconvenient for operation, some ultrasonic partial discharges
Monitoring device is easy the interference by extraneous factor in use, causes the error of monitoring result larger, and existing
The function that ultrasonic partial discharge monitoring device does not have inspection and directional monitoring while carrying out, humiture monitoring device are generally fixed to
On mounting structure, temperature and humidity in certain certain area can only be monitored, so that there are biggish limitations for the result of monitoring.
Utility model content
The purpose of this utility model is to provide station class ultrasonic partial discharge and humiture monitoring devices, to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the utility model provides the following technical solutions:
Station class ultrasonic partial discharge and humiture monitoring device, including pedestal, the first support plate, the first push plate, second
Fagging, crushing block, internal screw thread bar, the second support frame and ultrasonic partial discharge monitoring device；Left side above the pedestal is provided with
First sliding groove is provided with the first sliding block in first sliding groove, and the first mounting base is provided with above the first sliding block, and the top of pedestal is right
Side is equipped with fixed connecting base, and the top of fixed connecting base is equipped with the first mounting base, is rotatablely connected in the first mounting base by pin shaft
There is first support bar, the second mounting base is provided with above first support bar, the first support is installed above the second mounting base
Plate；The left and right sides above first support plate is provided with second sliding slot, and the centre above the first support plate is provided with first
Ultrasonic partial discharge monitoring modular, the centre of the first ultrasonic partial discharge monitoring modular are provided with ultrasonic partial discharge monitoring device, ultrasound
Centre above first support plate is set below wave partial discharge monitoring device；Centre above second support plate is provided with
First thread bush is provided with the first threaded rod on the first thread bush, is provided with rotary valve on the first threaded rod, under the first threaded rod
Side is provided with first bearing seat, crushing block is provided with below first bearing seat, crushing block is far from ultrasonic partial discharge monitoring device
Side be provided with the first push plate, the first push plate is provided with spring far from the side of ultrasonic partial discharge monitoring device, and spring is separate
The side of ultrasonic partial discharge monitoring device is provided with the second push plate, and it is sliding that second is arranged at below the first push plate and the second push plate
On slot；Third sliding slot is provided on the right side of second support frame, the left side below the second support frame is provided with first motor, the
Second threaded rod is installed above one motor, the second thread bush is provided on the second threaded rod, is provided on the second thread bush
Second motor is provided with third threaded rod on the right side of the second motor, and the second sliding block is connected on the right side of third threaded rod, and second is sliding
Block is arranged on third sliding slot, and the 4th thread bush is provided on third threaded rod, is provided with the second ultrasonic wave on the 4th thread bush
Partial discharge monitoring modular, the second ultrasonic partial discharge monitoring modular and the first ultrasonic partial discharge monitoring modular structure are identical；Described first
Centre below support plate is provided with third motor, and shaft is provided with below third motor, is provided with first below shaft
Gear is connected with second gear below first gear, and second gear is mounted on internal screw thread bar, the left and right sides of internal screw thread bar
It is provided with internal thread hole, the hand of spiral in the internal thread hole of the left and right sides on the internal thread hole of the left and right sides on the contrary, pacify
Equipped with the 4th threaded rod, the 4th threaded rod is mounted on second bearing seat far from the side of second gear, and second bearing seat is separate
The side of second gear is provided with connecting rod, and connecting rod is connect by third mounting base with first support bar.
Further scheme as the utility model: the left and right sides above first support plate is equipped with the first support
Frame is fixed together by welding between the first support frame and the first support plate, is set above the first support frame
It is equipped with the second support frame.
Further scheme as the utility model: metal is provided at left and right sides of the ultrasonic partial discharge monitoring device
Elastic slice, the top on the right side of metal clips are provided with semicircle convex block, and semicircle convex block is set close to the side of ultrasonic partial discharge monitoring device
It is equipped with the first rubber pad, the top on the left of metal clips is provided with oblique type convex block.
Further scheme as the utility model: the left and right sides above first support plate is respectively arranged with
It is provided between temperature monitoring device and humidity detection device, temperature monitoring device and humidity detection device and the first support frame
Second rubber pad.
Further scheme as the utility model: the outside of the ultrasonic partial discharge monitoring device is provided with metal screen
Shell is covered, puigging is provided on the inner wall of Metal shielding shell, the centre below Metal shielding shell is provided with signal wire, letter
It is provided with circuit board above number line, electric leads, the top setting of electric leads are connected at left and right sides of circuit board
There is sensor probe, is provided with absorbing material between the left and right sides and puigging of sensor probe.
Compared with prior art, the utility model is used cooperatively by the first threaded rod of setting and first thread bush, band
Dynamic crushing block moves down, and crushing block squeezes the first push plate and metal clips, can be respectively to temperature monitoring device, humidity detection
Device and ultrasonic partial discharge monitoring device carry out installation fixation, and structure is simple, convenient disassembly；The internal screw thread bar and the 4th spiral shell of setting
Being used cooperatively between rasp bar can adjust the height of temperature monitoring device and humidity detection device, make temperature monitoring device and
Humidity detection device can at various height be monitored the temperature and humidity in station；Be arranged the first ultrasonic partial discharge module and
Second ultrasonic partial discharge monitoring modular is used cooperatively, and can be oriented monitoring and inspection simultaneously；The Metal shielding shell of setting
The anti-interference ability of ultrasonic partial discharge monitoring device can be enhanced with absorbing material.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of station class ultrasonic partial discharge and humiture monitoring device.
Fig. 2 is the overlooking structure diagram of station class ultrasonic partial discharge and humiture monitoring device.
Fig. 3 is the structural representation of ultrasonic partial discharge monitoring device in station class ultrasonic partial discharge and humiture monitoring device
Figure.
Fig. 4 is the right side structural representation of station class ultrasonic partial discharge and humiture monitoring device.
In figure: 1, pedestal；2, first sliding groove；3, the first sliding block；4, the first mounting base；5, first support bar；6, the second peace
Fill seat；7, the first support plate；8, the first support frame；9, second sliding slot；10, the first push plate；11, spring；12, the second push plate；13,
Metal clips；14, semicircle convex block；15, the first rubber pad；16, oblique type convex block；17, the second support plate；18, the first thread bush；
19, the first threaded rod；20, rotary valve；21, first bearing seat；22, crushing block；23, the second rubber pad；24, third mounting base；25,
Connecting rod；26, second bearing seat；27, the 4th threaded rod；28, internal screw thread bar；29, internal thread hole；30, second gear；31,
One gear；32, shaft；33, third motor；34, the first ultrasonic partial discharge monitoring modular；35, the second ultrasonic partial discharge monitors mould
Block；36, the second support frame；37, the second threaded rod；38, first motor；39, the second thread bush；40, the second motor；41, third
Threaded rod；42, third sliding slot；43, the second sliding block；44, temperature monitoring device；45, ultrasonic partial discharge monitoring device；451, metal
Shield shell；452, puigging；453, signal wire；454, circuit board；455, electric leads；456, sensor probe；457, it inhales
Wave material；46, humidity detection device；47, the 4th thread bush；48, fixed connecting base.
Specific embodiment
The technical solution of the patent is explained in further detail With reference to embodiment.
Please refer to Fig. 1-4, station class ultrasonic partial discharge and humiture monitoring device, including pedestal 1, the first support plate 7,
One push plate 10, the second support plate 17, crushing block 22, internal screw thread bar 28, the second support frame 36 and ultrasonic partial discharge monitoring device 45；
The left side of 1 top of pedestal is provided with first sliding groove 2, and the first sliding block 3, the top of the first sliding block 3 are provided in first sliding groove 2
It is provided with the first mounting base 4, the upper right of pedestal 1 is equipped with fixed connecting base 48, and the top of fixed connecting base 48 is equipped with first
Mounting base 4 is rotatably connected to first support bar 5 by pin shaft in first mounting base 4, and the top of first support bar 5 is provided with
Two mounting bases 6, the top of the second mounting base 6 are equipped with the first support plate 7, and the left and right sides of 7 top of the first support plate is equipped with
First support frame 8 is fixed together by welding between first support frame 8 and the first support plate 7, the first support
The top of frame 8 is provided with the second support frame 36.
The left and right sides of first support plate, 7 top is provided with second sliding slot 9, and the centre of 7 top of the first support plate is set
It is equipped with the first ultrasonic partial discharge monitoring modular 34, the centre of the first ultrasonic partial discharge monitoring modular 34 is provided with ultrasonic partial discharge prison
Device 45 is surveyed, the centre of 7 top of the first support plate, ultrasonic partial discharge monitoring is arranged in the lower section of ultrasonic partial discharge monitoring device 45
The left and right sides of device 45 is provided with metal clips 13, and the top on 13 right side of metal clips is provided with semicircle convex block 14, half boss
Block 14 is provided with the first rubber pad 15, the top setting in 13 left side of metal clips close to the side of ultrasonic partial discharge monitoring device 45
There is oblique type convex block 16.
The centre of second support plate, 17 top is provided with the first thread bush 18, is provided with first on the first thread bush 18
Threaded rod 19, is provided with rotary valve 20 on the first threaded rod 19, and the lower section of the first threaded rod 19 is provided with first bearing seat 21, and first
The lower section of bearing block 21 is provided with crushing block 22, and crushing block 22 is provided with first far from the side of ultrasonic partial discharge monitoring device 45
Push plate 10, the first push plate 10 are provided with spring 11 far from the side of ultrasonic partial discharge monitoring device 45, and spring 11 is far from ultrasonic wave
The side of partial discharge monitoring device 45 is provided with the second push plate 12, and the lower section of the first push plate 10 and the second push plate 12 is arranged at second
On sliding slot 9.
The left and right sides of first support plate, 7 top is respectively arranged with temperature monitoring device 44 and humidity detection device
46, the second rubber pad 23 is provided between temperature monitoring device 44 and humidity detection device 46 and the first support frame 8.
As shown in Figure 1, 2, the right side of second support frame 36 is provided with third sliding slot 42,36 lower section of the second support frame
Left side is provided with first motor 38, and the top of first motor 38 is equipped with the second threaded rod 37, is provided on the second threaded rod 37
Second thread bush 39 is provided with the second motor 40 on second thread bush 39, and the right side of the second motor 40 is provided with third threaded rod
41, the right side of third threaded rod 41 is connected with the second sliding block 43, and the second sliding block 43 is arranged on third sliding slot 42, third threaded rod
It is provided with the 4th thread bush 47 on 41, the second ultrasonic partial discharge monitoring modular 35, the second ultrasound are provided on the 4th thread bush 47
Wave partial discharge monitoring modular 35 is identical with 34 structure of the first ultrasonic partial discharge monitoring modular.
The centre of first support plate, 7 lower section is provided with third motor 33, and the lower section of third motor 33 is provided with shaft
32, the lower section of shaft 32 is provided with first gear 31, and the lower section of first gear 31 is connected with second gear 30, and second gear 30 is pacified
On internal screw thread bar 28, the left and right sides of internal screw thread bar 28 is provided with internal thread hole 29, the internal thread hole 29 of the left and right sides
For interior hand of spiral on the contrary, being mounted on the 4th threaded rod 27 on the internal thread hole 29 of the left and right sides, the 4th threaded rod 27 is separate
The side of second gear 30 is mounted on second bearing seat 26, and second bearing seat 26 is provided with company far from the side of second gear 30
Extension bar 25, connecting rod 25 are connect by third mounting base 24 with first support bar 5.
The outside of the ultrasonic partial discharge monitoring device 45 is provided with Metal shielding shell 451, Metal shielding shell 451
Be provided with puigging 452 on inner wall, the centre of 451 lower section of Metal shielding shell is provided with signal wire 453, signal wire 453 it is upper
Side is provided with circuit board 454, and the left and right sides of 454 top of circuit board is connected with electric leads 455, the top of electric leads 455
It is provided with sensor probe 456, is provided with absorbing material 457 between the left and right sides and puigging 452 of sensor probe 456,
It can reinforce the anti-interference ability of ultrasonic partial discharge monitoring device 45, the suction wave of setting by the Metal shielding shell 451 of setting
Material 457 can absorb the ultrasonic interference signal generated due to extraneous vibration, have good interference free performance and sensitivity.
The working principle of the utility model is: ultrasonic partial discharge monitoring device 45 is placed on 7 top of the first support plate first
Centre, temperature monitoring device 44 and humidity detection device 46 are placed on to the left and right sides of the first support plate 7 respectively, by turn
Turn valve 20 moves down the first threaded rod 19, and the first threaded rod 19 drives crushing block 22 to move down, and crushing block 22 squeezes
Metal clips 13 squeezes ultrasonic partial discharge monitoring device 45 and compresses to it, while crushing block 22 squeezes the first push plate 10 to remote
Side from ultrasonic partial discharge monitoring device 45 is mobile, pushes the second push plate 12 by spring 11, the second push plate 12 is respectively to temperature
Degree monitoring device 44 and humidity detection device 46 are compressed, and are passed through the effect of first motor 38 and the second motor 40 respectively, are made
The second ultrasonic partial discharge monitoring modular 35 can on the second support frame 36 before after move left and right carry out inspection.
It is rotated by the zone of action turn axis 32 of third motor 33, shaft 32 drives first gear 31 to rotate, first gear
31 drive second gears 30 to rotate, and second gear 30 drives internal screw thread bar 28 to rotate, by rotating and reverse for third motor 33,
Internal screw thread bar 28 is able to drive the 4th threaded rod 27 to close or side movement far from second gear 30, when the 4th threaded rod
27 is mobile to the side close to second gear 30, and the 4th threaded rod 27 drives first support bar 5 to leaning on by third mounting base 24
The side of nearly second gear 30 is mobile, and first support bar 5 drives the first support plate 7 to move up, and the first support plate 7 is with dynamic temperature
Monitoring device 44 and humidity detection device 46 move up, when third motor 33 rotates backward, so that the first support plate 7 is with dynamic temperature
Degree monitoring device 44 and humidity detection device 46 move down, to reach 46 energy of temperature monitoring device 44 and humidity detection device
It is enough that temperature-humidity monitoring is carried out to station at various height.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection;It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State the concrete meaning of term in the present invention.
The preferred embodiment of the patent is described in detail above, but this patent is not limited to above-mentioned embodiment party
Formula within the knowledge of one of ordinary skill in the art can also be under the premise of not departing from this patent objective
Various changes can be made.
Claims (8)
1. a kind of station class ultrasonic partial discharge and humiture monitoring device, including pedestal (1), the first support plate (7), the first push plate
(10), the second support plate (17), crushing block (22), internal screw thread bar (28), the second support frame (36) and ultrasonic partial discharge monitoring dress
Set (45), which is characterized in that the left side above the pedestal (1) is provided with first sliding groove (2), and first sliding groove is provided on (2)
First sliding block (3) is provided with the first mounting base (4) above the first sliding block (3), and the upper right of pedestal (1) is equipped with fixed connect
The top of joint chair (48), fixed connecting base (48) is equipped with the first mounting base (4), is rotated and is connected by pin shaft in the first mounting base (4)
It is connected to first support bar (5), is provided with above first support bar (5) the second mounting base (6), the top of the second mounting base (6)
First support plate (7) are installed；The left and right sides above first support plate (7) is provided with second sliding slot (9), the first support
Centre above plate (7) is provided with the first ultrasonic partial discharge monitoring modular (34), the first ultrasonic partial discharge monitoring modular (34)
Centre is provided with ultrasonic partial discharge monitoring device (45), and the lower section of ultrasonic partial discharge monitoring device (45) is arranged in the first support plate
(7) centre above；Centre above second support plate (17) is provided with the first thread bush (18), the first thread bush (18)
On be provided with the first threaded rod (19), be provided on the first threaded rod (19) rotary valve (20), the first threaded rod is set below (19)
It is equipped with first bearing seat (21), is provided with below first bearing seat (21) crushing block (22), crushing block (22) is far from ultrasonic wave
The side of partial discharge monitoring device (45) is provided with the first push plate (10), and the first push plate (10) is far from ultrasonic partial discharge monitoring device
(45) side is provided with spring (11), and spring (11) is provided with second far from the side of ultrasonic partial discharge monitoring device (45) and pushes away
It is arranged on second sliding slot (9) below plate (12), the first push plate (10) and the second push plate (12).
2. station class ultrasonic partial discharge according to claim 1 and humiture monitoring device, which is characterized in that described second
It is provided on the right side of support frame (36) third sliding slot (42), the left side below the second support frame (36) is provided with first motor
(38), it is equipped with the second threaded rod (37) above first motor (38), the second threaded rod is provided with the second thread bush on (37)
(39), it is provided with the second motor (40) on the second thread bush (39), the second motor is provided with third threaded rod on the right side of (40)
(41), it being connected with the second sliding block (43) on the right side of third threaded rod (41), the second sliding block (43) is arranged on third sliding slot (42),
It is provided with the 4th thread bush (47) on third threaded rod (41), the monitoring of the second ultrasonic partial discharge is provided on the 4th thread bush (47)
Module (35).
3. station class ultrasonic partial discharge according to claim 2 and humiture monitoring device, which is characterized in that the second ultrasound
Wave partial discharge monitoring modular (35) is identical with the first ultrasonic partial discharge monitoring modular (34) structure.
4. station class ultrasonic partial discharge according to claim 2 or 3 and humiture monitoring device, which is characterized in that described
Centre below first support plate (7) is provided with third motor (33), and shaft (32) are provided with below third motor (33), is turned
It is provided with below axis (32) first gear (31), second gear (30), second gear is connected with below first gear (31)
(30) it is mounted on internal screw thread bar (28), internal thread hole (29), the left and right sides is provided at left and right sides of internal screw thread bar (28)
Internal thread hole (29) in hand of spiral on the contrary, being mounted on the 4th threaded rod on the internal thread hole (29) of the left and right sides
(27), the 4th threaded rod (27) is mounted on second bearing seat (26), second bearing seat far from the side of second gear (30)
(26) side far from second gear (30) is provided with connecting rod (25), and connecting rod (25) passes through third mounting base (24) and first
Support rod (5) connection.
5. station class ultrasonic partial discharge according to claim 4 and humiture monitoring device, which is characterized in that described first
The left and right sides above support plate (7) is equipped with the first support frame (8), is led between the first support frame (8) and the first support plate (7)
The mode for crossing welding is fixed together, and the second support frame (36) are provided with above the first support frame (8).
6. station class ultrasonic partial discharge according to claim 4 and humiture monitoring device, which is characterized in that the ultrasound
It is provided at left and right sides of wave partial discharge monitoring device (45) metal clips (13), the top on the right side of metal clips (13) is provided with half
Boss block (14), semicircle convex block (14) are provided with the first rubber pad (15) close to the side of ultrasonic partial discharge monitoring device (45),
Top on the left of metal clips (13) is provided with oblique type convex block (16).
7. station class ultrasonic partial discharge according to claim 4 and humiture monitoring device, which is characterized in that described first
The left and right sides above support plate (7) is respectively arranged with temperature monitoring device (44) and humidity detection device (46), temperature monitoring
The second rubber pad (23) are provided between device (44) and humidity detection device (46) and the first support frame (8).
8. station class ultrasonic partial discharge according to claim 4 and humiture monitoring device, which is characterized in that the ultrasound
The outside of wave partial discharge monitoring device (45) is provided with Metal shielding shell (451), is arranged on the inner wall of Metal shielding shell (451)
Have puigging (452), the centre below Metal shielding shell (451) is provided with signal wire (453), the top of signal wire (453)
It is provided with circuit board (454), the left and right sides above circuit board (454) is connected with electric leads (455), electric leads (455)
Top be provided with sensor probe (456), be provided between the left and right sides and puigging (452) of sensor probe (456)
Absorbing material (457).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920192083.7U CN209640448U (en) | 2019-02-12 | 2019-02-12 | Station class ultrasonic partial discharge and humiture monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920192083.7U CN209640448U (en) | 2019-02-12 | 2019-02-12 | Station class ultrasonic partial discharge and humiture monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209640448U true CN209640448U (en) | 2019-11-15 |
Family
ID=68493247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920192083.7U Active CN209640448U (en) | 2019-02-12 | 2019-02-12 | Station class ultrasonic partial discharge and humiture monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209640448U (en) |
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2019
- 2019-02-12 CN CN201920192083.7U patent/CN209640448U/en active Active
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