CN114152800A - Low-voltage overhead line current measuring and inspecting device - Google Patents
Low-voltage overhead line current measuring and inspecting device Download PDFInfo
- Publication number
- CN114152800A CN114152800A CN202111678748.3A CN202111678748A CN114152800A CN 114152800 A CN114152800 A CN 114152800A CN 202111678748 A CN202111678748 A CN 202111678748A CN 114152800 A CN114152800 A CN 114152800A
- Authority
- CN
- China
- Prior art keywords
- image acquisition
- acquisition device
- low
- current
- overhead line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 9
- 238000009826 distribution Methods 0.000 abstract description 10
- 238000007689 inspection Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 13
- 239000012212 insulator Substances 0.000 description 8
- 230000009194 climbing Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001342 Bakelite® Polymers 0.000 description 2
- 239000004637 bakelite Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001503987 Clematis vitalba Species 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a low-voltage overhead line current measuring and inspecting device, relates to a power distribution network current detecting device, aims to overcome the problems that the low-voltage overhead line load current measuring mode is low in artificial mechanical matching efficiency, resource waste and the problem that the daily inspection of low-voltage power distribution equipment is difficult to find faults in a concealed mode, and comprises an insulating rod body, a pincerlike current detecting device and a current indication reading device; the current reading device comprises an image acquisition device and an image receiving device; the top end of the insulating rod body is fixed with a pincer-shaped current detection device and an image acquisition device; the image acquisition end of the image acquisition device faces the current display screen of the pincerlike current detection device; the image signal output end of the image acquisition device is electrically connected with the image signal input end of the image receiving device.
Description
Technical Field
The invention relates to a power distribution network current detection device.
Background
The measurement of the load current of the low-voltage overhead line is an important means for mastering the load distribution condition of a transformer area, and the measurement is mainly used for measuring the current of each branch line, carrying out data analysis and finding a power stealing user. In remote rural areas, the overhead line is also used as a main mode of power transmission, pin insulators are generally applied, the temperature is low in winter, the surfaces of the insulators are frozen and expanded, and the insulators are often cracked to cause insulation damage, breakdown discharge and increase of line loss. In actual work, the following problems exist in the measurement of the load current of the low-voltage overhead line and the daily inspection of low-voltage distribution equipment:
1. because the low-voltage overhead line is arranged on a 10-meter pole tower, the pole climbing operation is needed for measuring the load current, the ice sealing period in the region of great Khingan is as long as 7 months, frost is frequently generated on the pole tower, the pole climbing easily slides off by using a conventional pole climbing climber, and great potential safety hazards exist. And moreover, the wearing of the worker is thick, the movement is clumsy, and the measurement work is not easy to develop. When the aerial work platform works, the aerial work platform is lifted to a safe distance, and then the measuring personnel use the pincerlike ammeter to measure phase by phase and record the measured value;
2. the working space which can be provided for the overhead working truck under the overhead line is narrow, so that the measurement work of partial branch current also needs to climb a pole, the use efficiency of the overhead working truck is low, and the resource waste is caused;
3. the low-voltage overhead line load current measurement efficiency is low. Taking my company as an example, the preparation work of the overhead working truck needs 20 minutes, and the measurement work needs only 6 minutes. Taking a 10M rod as a column, climbing the rod by one worker according to a specified safety operation procedure, tying a safety belt, fastening a safety rope, and measuring data phase by phase, wherein the measuring operation needs more than 10 minutes;
4. low-voltage distribution equipment is all in the eminence, regards insulator to patrol as the example, and insulator surface and its slight crackle are observed hardly to discover under the pole, but can cause the electric leakage, cause economic loss.
Disclosure of Invention
The invention aims to solve the problems that the low-voltage overhead line load current measurement mode is low in artificial machinery matching efficiency, resource waste and the problem that faults are difficult to find in daily inspection of concealed low-voltage distribution equipment, and provides a low-voltage overhead line current measurement and inspection device.
The invention discloses a low-voltage overhead line current measuring and inspecting device, which comprises an insulating rod body, a pincer-shaped current detecting device and a current reading device, wherein the insulating rod body is provided with a plurality of conducting wires;
the current reading device comprises an image acquisition device and an image receiving device;
the top end of the insulating rod body is fixed with a pincer-shaped current detection device and an image acquisition device;
the image acquisition end of the image acquisition device faces the current display screen of the pincerlike current detection device;
the image signal output end of the image acquisition device is electrically connected with the image signal input end of the image receiving device.
The low-voltage overhead line current measuring and inspecting device also comprises a movable jaw and a static jaw;
the bottom of the movable jaw is fixed with the outer side wall of an iron core of the pincerlike current detection device, and the bottom of the movable jaw is provided with a drag hook;
the bottom of the static jaw is fixed with the outer side wall of the other iron core of the pincerlike current detection device;
and the movable jaw and the static jaw directly form a V-shaped opening, and the bottom of the V-shaped opening is positioned at the closed position of the two iron cores of the clamp-shaped current detection device.
The invention has the beneficial effects that:
firstly, the operation on the ground is simple, the contact part of the clamp-on ammeter and a lead after design and transformation is flexible, and the lead can easily enter the clamp-on ammeter to form a measuring loop;
secondly, the measurement is carried out without climbing a rod, so that the labor and the machinery are effectively saved, the personal operation risk is reduced, and the working efficiency is improved;
thirdly, the power failure operation is not needed in the measurement and the inspection by using the device, so that the power supply reliability is improved, and the complaint risk of power customers is reduced;
and fourthly, through mobile measurement, the measured value comparison of branch lines can be realized, low-voltage distribution equipment is patrolled, and a leakage point, fault equipment and an electricity stealing user are quickly found.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage overhead line current measuring and inspecting device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In a first specific embodiment, the low-voltage overhead line current measuring and inspecting device of the present embodiment includes an insulating rod 1, a pincer-shaped current detecting device 2, and a current reading device 3;
the current reading device 3 comprises an image acquisition device 3-1 and an image receiving device 3-2;
the top end of the insulating rod body 1 is fixed with a pincer-shaped current detection device 2 and an image acquisition device 3-1;
the image acquisition end of the image acquisition device 3-1 faces the current display screen 2-1 of the pincerlike current detection device 2;
the image signal output end of the image acquisition device 3-1 is electrically connected with the image signal input end of the image receiving device 3-2.
Wherein, the device also comprises a movable jaw 4 and a static jaw 5;
the bottom of the movable jaw 4 is fixed with the outer side wall of an iron core of the pincerlike current detection device 2, and the bottom of the movable jaw 4 is provided with a drag hook;
the bottom of the static jaw 5 is fixed with the outer side wall of the other iron core of the pincer-shaped current detection device 2;
and a V-shaped opening 6 is formed between the movable jaw 4 and the static jaw 5, and the bottom of the V-shaped opening 6 is positioned at the closed position of the two iron cores of the clamp-shaped current detection device 2.
Wherein, the elastic coefficient of the iron core locking spring of the pincerlike current detection device 2 is less than or equal to 850 g/mm.
Wherein, the insulating rod body 1 is a telescopic rod body.
Wherein, also include the fixing part 7 of the image acquisition device;
the image acquisition device 3-1 is fixed at the top end of the insulating rod body 1 through an image acquisition device fixing part 7;
the section of the image acquisition device fixing piece 7 is U-shaped, the image acquisition device fixing piece 7 clamps the image acquisition device 3-1, and the image acquisition device 3-1 and the image acquisition device fixing piece 7 are fixed through an adjusting bolt 8; the image acquisition angle of the image acquisition device 3-1 can be changed by adjusting the adjusting bolt 8.
Specifically, the improved clamp-on ammeter comprises a clamp-on ammeter (a clamp-on current detection device 2), a telescopic insulating rod (an insulating rod body 1), a camera device (an image acquisition device 3-1) with a WIFI function micro hotspot and a data receiving device (an image receiving device 3-2, a smart phone can be selected for use).
The improved clamp-on ammeter has two main improvements:
the clamp jaws (the movable jaw 4 and the fixed jaw 5 form a V-shaped opening 6) are made of resin bakelite (bakelite) which has high mechanical strength, good cold brittleness and good insulation property, does not have magnetic conductivity and can not change the magnetic flux in an open transformer, and a wire is easy to measure and enters the jaw-shaped ammeter.
Secondly, a lot of service lines freely swing, the support is not enough under the actual use condition, the tong-type ampere meter locking spring strength is too big, low pressure overhead conductor is difficult for getting into the table mouth, reduces tong-type ampere meter locking spring to 850g by original 1180g through experimental test on the basis of guaranteeing to measure accuracy, easily will measure the wire and get into the tong-type ampere meter mouth. Scalable insulator spindle length is extendible to 8 meters, and the clamp-on ammeter after the transformation is fixed on scalable insulator spindle top through insulating fixing device, and camera device fixes in clamp-on ammeter screen dead ahead (scalable insulator spindle top) through insulating fixing device, and smart mobile phone is chooseed for use to data receiving arrangement, and installation APP realizes transmitting data, record data with camera device.
The use method I comprises the following steps: the platform district operating personnel can use this device to carry out load current measurement to overhead lines such as the low voltage line in platform district, branch line, service entrance line, investigate whether power consumption customer exists the action of stealing electricity. The climate of Daxing' an mountain is cold, the heating period of 7 months is as long as the whole year, the temperature in winter is as low as-22-36 ℃, the electric heating is clean and efficient, the electric heating is developed into an important heating mode step by step, the single-storey house area is mostly a non-centralized heating area, the electric heating has high power consumption, the electric charge is increased, and the phenomenon of electricity stealing heating is formed in many places. The operator in the platform area only needs to utilize the device to measure the destination of the heavy current of the low-voltage overhead line one by one in the power utilization valley, finds out that the current of the house-entering line is large, and then checks whether the metering device of the single-storey house displays the current and the measured current is consistent or not, so that whether the house normally uses the power or not is judged easily.
The using method II comprises the steps of dismantling the clamp-on ammeter, independently installing the camera device on the top end of the insulating telescopic rod, observing the length of the insulating rod after the height of the target is adjusted according to needs, enabling the camera device to be close to low-voltage power distribution equipment to be observed, and observing whether the insulation and the appearance of various electrified power distribution equipment have defects or not and are damaged through real-time images, photos and videos in the mobile phone APP.
The device has the advantages of simple structure, telescopic function, convenience in carrying and transportation, light weight, low overall manufacturing cost, wide application scene and no limitation by conditions such as geography, temperature and communication signals.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features from different dependent claims and herein may be combined in ways other than those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other embodiments.
Claims (5)
1. A low-voltage overhead line current measuring and inspecting device is characterized by comprising an insulating rod body (1), a pincer-shaped current detecting device (2) and a current reading device (3);
the current reading device (3) comprises an image acquisition device (3-1) and an image receiving device (3-2);
the top end of the insulating rod body (1) is fixed with a pincer-shaped current detection device (2) and an image acquisition device (3-1);
and the image acquisition end of the image acquisition device (3-1) faces the current display screen (2-1) of the clamp-shaped current detection device (2);
the image signal output end of the image acquisition device (3-1) is electrically connected with the image signal input end of the image receiving device (3-2).
2. The low-voltage overhead line current measuring and patrolling device according to claim 1, further comprising a movable jaw (4) and a static jaw (5);
the bottom of the movable jaw (4) is fixed with the outer side wall of an iron core of the pincer-shaped current detection device (2), and the bottom of the movable jaw (4) is provided with a drag hook;
the bottom of the static jaw (5) is fixed with the outer side wall of the other iron core of the pincer-shaped current detection device (2);
and a V-shaped opening (6) is formed between the movable jaw (4) and the static jaw (5), and the bottom of the V-shaped opening (6) is positioned at the closed position of two iron cores of the clamp-shaped current detection device (2).
3. A low voltage overhead line current measuring and patrolling device according to claim 1 or 2, characterized in that the spring constant of the iron core locking spring of the clamp-on current detection device (2) is less than or equal to 850 g/mm.
4. A low voltage overhead line current measuring and patrolling device according to claim 1, characterized in that the insulating rod body (1) is a telescopic rod body.
5. A low voltage overhead line current measuring and patrolling device according to claim 1, 2 or 4, further comprising an image acquisition device fixing member (7);
the image acquisition device (3-1) is fixed at the top end of the insulating rod body (1) through an image acquisition device fixing part (7);
the section of the image acquisition device fixing piece (7) is U-shaped, the image acquisition device fixing piece (7) clamps the image acquisition device (3-1), and the image acquisition device (3-1) is fixed with the image acquisition device fixing piece (7) through an adjusting bolt (8); the image acquisition angle of the image acquisition device (3-1) can be changed by adjusting the adjusting bolt (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111678748.3A CN114152800A (en) | 2021-12-31 | 2021-12-31 | Low-voltage overhead line current measuring and inspecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111678748.3A CN114152800A (en) | 2021-12-31 | 2021-12-31 | Low-voltage overhead line current measuring and inspecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114152800A true CN114152800A (en) | 2022-03-08 |
Family
ID=80449727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111678748.3A Pending CN114152800A (en) | 2021-12-31 | 2021-12-31 | Low-voltage overhead line current measuring and inspecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114152800A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118655420A (en) * | 2024-08-15 | 2024-09-17 | 山东浪潮科学研究院有限公司 | RISC-V-based high-voltage line detection system and method |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202230120U (en) * | 2011-08-09 | 2012-05-23 | 浙江大合建设工程检测有限公司 | Clip-on ammeter |
| CN202929089U (en) * | 2012-11-15 | 2013-05-08 | 国家电网公司 | Current measure equipment |
| CN103592501A (en) * | 2013-11-27 | 2014-02-19 | 国家电网公司 | Low-voltage current measuring bar |
| CN203809653U (en) * | 2013-12-26 | 2014-09-03 | 攀钢集团西昌钢钒有限公司 | Clamping device |
| CN206431189U (en) * | 2017-02-17 | 2017-08-22 | 国网四川省电力公司内江供电公司 | A kind of new pincerlike current measuring instrument |
| CN206561300U (en) * | 2017-03-15 | 2017-10-17 | 山东英才学院 | A kind of mechanical holding device |
| CN206671425U (en) * | 2017-04-24 | 2017-11-24 | 深圳市鸿泰安全技术有限公司 | A kind of open-and-close mechanism of pliers-shape earthing resistance instrument |
| US20180224482A1 (en) * | 2017-02-08 | 2018-08-09 | Peaceful Thriving Enterprise Co., Ltd. | Clamp Meter |
| CN207924001U (en) * | 2018-04-04 | 2018-09-28 | 广州市铱泰电子科技有限公司 | A kind of wireless high-low pressure clamp on amperemeter |
| CN209911444U (en) * | 2019-04-17 | 2020-01-07 | 国网山西省电力公司沁水县供电公司 | Current tester for overhead conductor |
| CN112540215A (en) * | 2020-11-26 | 2021-03-23 | 广东电网有限责任公司 | Electricity stealing evidence obtaining device and electricity stealing evidence obtaining method |
| CN216847928U (en) * | 2021-12-31 | 2022-06-28 | 国网黑龙江省电力有限公司大兴安岭供电公司 | Low pressure overhead line current measurement and tour device |
-
2021
- 2021-12-31 CN CN202111678748.3A patent/CN114152800A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202230120U (en) * | 2011-08-09 | 2012-05-23 | 浙江大合建设工程检测有限公司 | Clip-on ammeter |
| CN202929089U (en) * | 2012-11-15 | 2013-05-08 | 国家电网公司 | Current measure equipment |
| CN103592501A (en) * | 2013-11-27 | 2014-02-19 | 国家电网公司 | Low-voltage current measuring bar |
| CN203809653U (en) * | 2013-12-26 | 2014-09-03 | 攀钢集团西昌钢钒有限公司 | Clamping device |
| US20180224482A1 (en) * | 2017-02-08 | 2018-08-09 | Peaceful Thriving Enterprise Co., Ltd. | Clamp Meter |
| CN206431189U (en) * | 2017-02-17 | 2017-08-22 | 国网四川省电力公司内江供电公司 | A kind of new pincerlike current measuring instrument |
| CN206561300U (en) * | 2017-03-15 | 2017-10-17 | 山东英才学院 | A kind of mechanical holding device |
| CN206671425U (en) * | 2017-04-24 | 2017-11-24 | 深圳市鸿泰安全技术有限公司 | A kind of open-and-close mechanism of pliers-shape earthing resistance instrument |
| CN207924001U (en) * | 2018-04-04 | 2018-09-28 | 广州市铱泰电子科技有限公司 | A kind of wireless high-low pressure clamp on amperemeter |
| CN209911444U (en) * | 2019-04-17 | 2020-01-07 | 国网山西省电力公司沁水县供电公司 | Current tester for overhead conductor |
| CN112540215A (en) * | 2020-11-26 | 2021-03-23 | 广东电网有限责任公司 | Electricity stealing evidence obtaining device and electricity stealing evidence obtaining method |
| CN216847928U (en) * | 2021-12-31 | 2022-06-28 | 国网黑龙江省电力有限公司大兴安岭供电公司 | Low pressure overhead line current measurement and tour device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118655420A (en) * | 2024-08-15 | 2024-09-17 | 山东浪潮科学研究院有限公司 | RISC-V-based high-voltage line detection system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9575101B2 (en) | Power monitoring systems and methods | |
| CN104655982A (en) | Patrol inspection system and method for single-phase-to-earth fault points of power distribution line | |
| CN201247302Y (en) | Apparatus for measuring polar of isonym end of current mutual inductor or transformer | |
| CN216847928U (en) | Low pressure overhead line current measurement and tour device | |
| US20170292999A1 (en) | Transformer monitoring and data analysis systems and methods | |
| CN110703136A (en) | Live detection device and method for leakage current of insulator of power transmission line | |
| CN114152800A (en) | Low-voltage overhead line current measuring and inspecting device | |
| Carlini et al. | Uprating an overhead line. Italian TSO applications for integration of RES | |
| CN108318732B (en) | On-line monitoring device and method for grounding current of transformer core | |
| US20140312893A1 (en) | Intelligent electronic sensors for monitoring electrical circuits | |
| CN103293507A (en) | Online detection method of error of current transformer | |
| CN103543321B (en) | A kind of polarization for crosslinked polyethylene midium voltage cable-depolarization current pick-up unit | |
| CN104391168A (en) | System and method for inspecting grounding current of accessories of single-core cable having voltage grade above 35kV | |
| CN204479647U (en) | 35kV and above single core cable annex ground current cruising inspection system | |
| CN205545708U (en) | Dolly is patrolled and examined to transformer substation's solar energy | |
| CN108303142A (en) | Determine phase nuclear phase, electric current, the harvester of voltage and system for telecommunication network base station | |
| CN204479654U (en) | A kind of alternating current circuit alternating-current lightning arrestor electrification detection system | |
| CN201804097U (en) | High voltage electric energy metering device with on-line checking and testing standard | |
| CN207007466U (en) | Overhead transmission line windage yaw characteristic monitoring platform | |
| Takahashi et al. | Demonstration and verification tests of 500 m long HTS power cable | |
| CN113701889B (en) | Cable joint temperature measuring equipment based on electric field electricity taking and temperature measuring method thereof | |
| CN210427688U (en) | Portable platform district decreases and decreases investigation device | |
| CN209542707U (en) | High pressure outside line porcelain insulator resistance measurement bar | |
| CN107765059A (en) | A kind of fishing rod type clamp multimeter | |
| CN210487896U (en) | Accurate positioning device for short circuit fault of high-voltage cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |