CN116223879A - Novel shaft voltage measuring tool universally applicable to hydraulic generator - Google Patents
Novel shaft voltage measuring tool universally applicable to hydraulic generator Download PDFInfo
- Publication number
- CN116223879A CN116223879A CN202310032556.8A CN202310032556A CN116223879A CN 116223879 A CN116223879 A CN 116223879A CN 202310032556 A CN202310032556 A CN 202310032556A CN 116223879 A CN116223879 A CN 116223879A
- Authority
- CN
- China
- Prior art keywords
- carbon brush
- measuring
- measuring rod
- shaft voltage
- brush seat
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 77
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000002788 crimping Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 12
- 208000027418 Wounds and injury Diseases 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 4
- 208000014674 injury Diseases 0.000 abstract description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 206010014357 Electric shock Diseases 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
The invention discloses a novel shaft voltage measuring tool which is universally applicable to a hydraulic generator, and the novel shaft voltage measuring tool comprises a measuring rod, a digital display voltmeter and a carbon brush seat, wherein the measuring rod is of a hollow structure, a measuring handle is nested on the surface of the lower part of the measuring rod, a storage barrel is arranged at the lower end part of the measuring rod, the carbon brush seat is arranged at the upper end part of the measuring rod, and a cylindrical carbon brush is arranged in the carbon brush seat; the digital display voltmeter is sleeved inside the measuring rod, the measuring lead wire of the digital display voltmeter is fixedly connected with the cylindrical carbon brush inside the measuring rod, and the grounding lead wire is stored in the storage barrel. The novel shaft voltage measuring tool which is universally applicable to the hydraulic generator is simple in structure, the position of a person is not limited by the length of the measuring lead of the universal meter during measurement, the measuring person can adjust the length of the measuring rod according to actual conditions, the person is ensured to be far away from the rotating and electrified collecting ring, mechanical injury and electric shock injury are prevented, and the personal safety during measurement is ensured.
Description
Technical Field
The invention belongs to the technical field of hydro-generator sets, and particularly relates to a novel shaft voltage measuring tool which is universally applicable to hydro-generator sets.
Background
The voltage induced by the unbalanced alternating magnetic field in the generator on the large shaft is shaft voltage, and for the hydroelectric generating set, the voltage exists between the large shaft and the guide bearing, and according to different set structures and running states, the voltage is within about 20V of AC and is mainly based on fundamental wave components. When the running state of the generator changes or faults cause the shaft voltage to exceed the insulation strength of an oil film between the large shaft and the bearing, the large shaft and the bearing are discharged, so that the content of metal particles in the oil film is increased, the insulation strength of the oil film is reduced, the discharging phenomenon is easier to occur, further a chain reaction is formed, finally, the shaft current flows through the large-shaft grounding carbon brush to form a low-impedance loop, at the moment, the shaft current can reach hundreds of amperes, the energy is very high, the thermal effect accelerates the aging and deterioration of oil, and finally, the burning loss of a bearing bush and a shaft neck is caused, and therefore, the hydraulic generator is regulated to measure the shaft voltage in A repair or when necessary in the DL/596-2021 electric equipment preventive test procedure, and is generally measured in a startup test link after unit maintenance in production.
Currently, no universal measuring tool for the voltage of the shaft of the water turbine generator exists in the industry, no such product exists in the market, each unit generally self-controls a simple measuring tool according to actual conditions, the tool generally comprises a wood rod with a carbon brush bound at the end part and a universal meter, a person inserts the universal meter into a carbon brush braid during measurement, the wood rod is held by hand to enable the carbon brush to be in sliding contact with a large shaft, and the universal meter is used for measuring the voltage of the large shaft to the ground. The measuring tool is too simple, and because the length of the measuring lead of the universal meter is limited, the personnel has to be close to the rotating and electrified collecting ring during measurement, so that the personal safety of the measuring personnel cannot be guaranteed; because the multimeter pen is unstable with carbon brush braid contact, data jump easily during the measurement, the measurement is inaccurate, and measuring tool is convenient inadequately in storage and use.
Disclosure of Invention
The invention aims to solve the problems of unsafe, inaccurate and inconvenient measurement work of the shaft voltage of a hydraulic generator, and provides a novel shaft voltage measuring tool which is universally applicable to the hydraulic generator, so that the shaft voltage can be measured efficiently and accurately under the condition of ensuring personnel safety.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a novel axle voltage measuring tool that is commonly suitable for hydraulic generator, includes measuring stick, digital display voltmeter and carbon brush seat, the measuring stick is hollow structure, measuring handle is nested to measuring stick lower part surface, the measuring stick lower extreme is provided with the receiving vessel, the carbon brush seat is installed to measuring stick upper end, install cylindricality carbon brush in the carbon brush seat; the digital display voltmeter is sleeved inside the measuring rod, the measuring lead wire of the digital display voltmeter is fixedly connected with the cylindrical carbon brush inside the measuring rod, and the grounding lead wire is stored in the storage barrel.
Preferably, the measuring rod is a telescopic structure formed by sleeving a plurality of sleeve rods, the measuring rod 1 is made of epoxy resin, and the upper end and the lower end of the measuring rod are both of an opening structure.
Preferably, the receiving cylinder is made of light PVC material, and the receiving cylinder is in threaded connection with the measuring rod.
Preferably, the carbon brush seat is made of light PVC material, and the carbon brush seat is in threaded connection with the measuring rod.
Preferably, the lower part of the carbon brush seat is provided with a crimping type binding post, and the meter measuring lead and the carbon brush braid are fixedly connected to the binding post.
Preferably, the inside of the carbon brush seat is of a groove structure, the cylindrical carbon brush is arranged in the carbon brush seat, and the carbon brush braids are led to the crimping connecting terminal through the through holes at the lower part of the carbon brush seat.
Preferably, a cap made of light PVC material is arranged at the top of the carbon brush seat, and the cap is in threaded connection with the carbon brush seat 5.
Compared with the prior art, the invention has the following beneficial effects:
1. the novel shaft voltage measuring tool is universally applicable to the hydraulic generators, the length of a measuring rod can be adjusted within the length of about 1.5m-2.2m, and the novel shaft voltage measuring tool is universally applicable to shaft voltage measuring work of hydraulic generator sets of various power stations; during measurement, the position of a person is not limited by the length of the measuring lead of the universal meter any more, the measuring staff can adjust the length of the measuring rod according to actual conditions, the person is guaranteed to keep away from the rotating and electrified collecting ring, mechanical injury and electric shock injury are prevented, and the personal safety during measurement is guaranteed.
2. The novel shaft voltage measuring tool is universally applicable to the hydraulic generator, the measuring lead of the digital display voltmeter is fixedly connected with the carbon brush braid, the digital display voltmeter and the carbon brush braid are in stable contact, and the measuring data are accurate and have no jump; the measuring tool adopts a digital display voltmeter, the digital display voltmeter is sleeved in the measuring rod, and the grounding lead of the digital display voltmeter is placed in the storage box, so that the whole tool is exquisite and concise; carbon brush protection cap has been set up on measuring stick upper portion, can effectively prevent the carbon brush and burst apart in instrument use and the storage process, reduces the frequency of changing the carbon brush. The measuring rod is made of epoxy resin, so that the insulation strength is not easy to decrease due to damp, a rubber handle is arranged at the lower part of the measuring rod, and the insulation strength of the whole set of measuring tool is higher.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present invention.
Fig. 2 is a partial structural schematic diagram of an embodiment of the present invention.
In the above figures: 1. a measuring rod; 2. a measuring handle; 3. a storage barrel; 4. a ground lead; 5. a carbon brush holder; 6. a digital display voltmeter; 7. measuring leads; 8. brushing braids on carbon brushes; 9. a connection terminal; 10. a cylindrical carbon brush; 11. a through hole; 12. and (3) capping.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and fig. 2, as a preferred embodiment of the present invention, the present embodiment provides a novel shaft voltage measuring tool commonly applicable to a hydraulic generator, including a measuring rod 1, a digital display voltmeter 6 and a carbon brush seat 5, where the measuring rod 1 is of a hollow structure, a measuring handle 2 is nested on the lower surface of the measuring rod 1, the measuring handle 2 is made of rubber, and the length is 0.3m, and is nested on the lower part of the measuring rod 1, so as to ensure personal safety during measurement; the lower end part of the measuring rod 1 is provided with a storage barrel 3, the upper end part of the measuring rod 1 is provided with a carbon brush seat 5, and a cylindrical carbon brush 10 is arranged in the carbon brush seat 5; the digital display voltmeter 6 is sleeved inside the measuring rod 1, only the display screen, the gear adjusting keys and the button battery bin are exposed outside, the application range of alternating current voltage gear measurement is 0-1000Hz, and the internal resistance is not less than 1000kΩ/V; the length of the grounding lead 4 of the digital display voltmeter 6 is 1.5m, the length of the measuring lead 7 is 1.7m, and the two are thin soft copper wires, so that the measuring lead 7 can be stretched and bent inside the measuring rod 1 when the measuring rod 1 stretches and contracts, the measuring lead 7 is fixedly connected with the cylindrical carbon brush 10 inside the measuring rod 1, and the grounding lead 4 is stored in the storage barrel 3.
In some embodiments, the measuring rod 1 is a telescopic structure formed by sleeving a plurality of sleeve rods, one structural form is that the measuring rod 1 is formed by sleeving an upper section and a lower section, and is similar to a fishing rod structure, wherein the length of the lower section is 1.5m, the length of the upper section is 0.7m, and the measuring rod can be telescopic in 1.5m-2.2m for adjusting the length; the measuring rod 1 is made of epoxy resin, insulation strength is guaranteed, the upper end and the lower end of the measuring rod 1 are of an opening structure, the inside of the measuring rod is hollow, and the wall thickness of the measuring rod is 2mm, so that the weight of a tool is reduced.
In other embodiments, the accommodating barrel 3 is made of light PVC material, so as to reduce the weight of the tool, and has a length of 0.15m, and is used for storing the grounding lead 4 of the digital display voltmeter, and the accommodating barrel 3 is in threaded connection with the measuring rod 1.
In some preferred embodiments, the carbon brush holder 5 is made of light PVC material to reduce the weight of the tool, and the length thereof is 0.15m, and the carbon brush holder 5 is screwed with the measuring rod 1.
As another embodiment of the present invention, a crimp connection terminal 9 is disposed at the lower portion of the carbon brush base 5, and the gauge wire 7 and the carbon brush braid 8 are fixedly connected to the connection terminal 9.
Specifically, the inside of the carbon brush seat 5 is of a groove structure, the cylindrical carbon brush 10 is placed in the carbon brush seat 5, and the carbon brush braid 8 is led to the crimping terminal 9 through a through hole 11 at the lower part of the carbon brush seat 5.
In other preferred embodiments, the top of the carbon brush seat 5 is provided with a cap 12 made of light PVC, and the cap 12 is screwed with the carbon brush seat 5, so as to reduce the weight of the tool, and the cap 12 can prevent the carbon brush from cracking when the tool is dropped or knocked down carelessly, so as to avoid frequent replacement of the carbon brush.
During measurement, the cap 12 is firstly opened, the cylindrical carbon brush 10 is exposed, the storage barrel 3 is opened, the grounding lead 4 of the digital display voltmeter is taken out and clamped at a site grounding point, the digital display voltmeter 6 is adjusted to a proper range, the measuring rod 1 is adjusted to a proper length, a person holds the measuring handle 2 at the lower part of the measuring rod 1, the cylindrical carbon brush 10 is in stable contact with a large shaft of the generator, and the shaft voltage measured value is read from the display screen of the digital display voltmeter 6.
Carbon brush replacement: keeping the upper section of the measuring rod 1 in a retracted state, unscrewing the carbon brush seat 5 from the measuring rod 1, loosening the crimping type wiring terminal 9, and taking out the cylindrical carbon brush 10; taking out the new carbon brush, adjusting the length of the brush braid of the new carbon brush, and preferably, the length of the brush braid of the new carbon brush can be just connected to the crimping type wiring terminal 9, leading the brush braid 8 of the new carbon brush into the crimping type wiring terminal 9 through the through hole 11 and connecting the brush braid with the measuring lead 7, screwing the crimping screw of the crimping type wiring terminal 9, and screwing the brush holder 5 on the measuring rod 1.
Replacing a digital display voltmeter battery: and opening a button battery compartment on the surface of the digital display voltmeter 6, taking out the old battery, and replacing the new button battery.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (7)
1. A novel axle voltage measuring tool that is commonly suitable for hydraulic generator, its characterized in that: the measuring device comprises a measuring rod (1), a digital display voltmeter (6) and a carbon brush seat (5), wherein the measuring rod (1) is of a hollow structure, a measuring handle (2) is embedded in the surface of the lower part of the measuring rod (1), a storage barrel (3) is arranged at the lower end part of the measuring rod (1), the carbon brush seat (5) is arranged at the upper end part of the measuring rod (1), and a cylindrical carbon brush (10) is arranged in the carbon brush seat (5); the digital display voltmeter (6) is sleeved inside the measuring rod (1), a measuring lead (7) of the digital display voltmeter is fixedly connected with the cylindrical carbon brush (10) inside the measuring rod (1), and a grounding lead (4) is stored in the storage barrel (3).
2. The novel shaft voltage measuring tool universally applicable to hydraulic generators of claim 1, wherein: the measuring rod (1) is of a telescopic structure formed by sleeving a plurality of sleeve rods, the measuring rod (1) is made of epoxy resin, and the upper end and the lower end of the measuring rod are both of an opening structure.
3. A novel shaft voltage measuring tool commonly applicable to hydraulic generators as in claim 1, wherein: the storage barrel (3) is made of light PVC materials, and the storage barrel (3) is in threaded connection with the measuring rod (1).
4. A novel shaft voltage measuring tool commonly applicable to hydraulic generators as in claim 1, wherein: the carbon brush seat (5) is made of light PVC materials, and the carbon brush seat (5) is in threaded connection with the measuring rod (1).
5. A novel shaft voltage measuring tool commonly applicable to hydraulic generators as in claim 1, wherein: the lower part of the carbon brush seat (5) is provided with a crimping type wiring terminal (9), and the meter measuring lead (7) and the carbon brush braid (8) are fixedly connected to the wiring terminal (9).
6. A novel shaft voltage measuring tool commonly applicable to hydraulic generators as in claim 5, wherein: the inside of the carbon brush seat (5) is of a groove structure, the cylindrical carbon brush (10) is arranged in the carbon brush seat (5), and the carbon brush braid 8 is led to the crimping type wiring terminal (9) through a through hole (11) at the lower part of the carbon brush seat (5).
7. A novel shaft voltage measuring tool commonly applicable to hydraulic generators as in claim 5, wherein: the top of the carbon brush seat (5) is provided with a cap (12) made of light PVC material, and the cap (12) is in threaded connection with the carbon brush seat (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032556.8A CN116223879A (en) | 2023-01-10 | 2023-01-10 | Novel shaft voltage measuring tool universally applicable to hydraulic generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032556.8A CN116223879A (en) | 2023-01-10 | 2023-01-10 | Novel shaft voltage measuring tool universally applicable to hydraulic generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116223879A true CN116223879A (en) | 2023-06-06 |
Family
ID=86570756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032556.8A Pending CN116223879A (en) | 2023-01-10 | 2023-01-10 | Novel shaft voltage measuring tool universally applicable to hydraulic generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116223879A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205992016U (en) * | 2016-08-29 | 2017-03-01 | 酒泉钢铁(集团)有限责任公司 | A kind of motor shaft-voltage measurement instrument |
| CN107576837A (en) * | 2017-07-24 | 2018-01-12 | 国家电网公司 | A kind of generator shaft voltage measuring apparatus |
| CN110687342A (en) * | 2019-09-23 | 2020-01-14 | 大唐陕西发电有限公司西安热电厂 | Generator shaft voltage measuring tool |
| CN213633587U (en) * | 2020-11-26 | 2021-07-06 | 天津华能杨柳青热电有限责任公司 | Generator shaft voltage measuring device |
| CN217385633U (en) * | 2022-05-25 | 2022-09-06 | 华能山东石岛湾核电有限公司 | Turbine generator shaft voltage measuring device |
| CN217561599U (en) * | 2022-03-28 | 2022-10-11 | 深圳市宝新宇机电设备有限公司 | Generator shaft voltage measuring equipment |
| CN217639257U (en) * | 2022-05-24 | 2022-10-21 | 华能山东石岛湾核电有限公司 | Generator shaft voltage measuring device |
-
2023
- 2023-01-10 CN CN202310032556.8A patent/CN116223879A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205992016U (en) * | 2016-08-29 | 2017-03-01 | 酒泉钢铁(集团)有限责任公司 | A kind of motor shaft-voltage measurement instrument |
| CN107576837A (en) * | 2017-07-24 | 2018-01-12 | 国家电网公司 | A kind of generator shaft voltage measuring apparatus |
| CN110687342A (en) * | 2019-09-23 | 2020-01-14 | 大唐陕西发电有限公司西安热电厂 | Generator shaft voltage measuring tool |
| CN213633587U (en) * | 2020-11-26 | 2021-07-06 | 天津华能杨柳青热电有限责任公司 | Generator shaft voltage measuring device |
| CN217561599U (en) * | 2022-03-28 | 2022-10-11 | 深圳市宝新宇机电设备有限公司 | Generator shaft voltage measuring equipment |
| CN217639257U (en) * | 2022-05-24 | 2022-10-21 | 华能山东石岛湾核电有限公司 | Generator shaft voltage measuring device |
| CN217385633U (en) * | 2022-05-25 | 2022-09-06 | 华能山东石岛湾核电有限公司 | Turbine generator shaft voltage measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108646152A (en) | A kind of method of polarization/depolarization current method check and evaluation stator bar insulation ag(e)ing state | |
| CN206146323U (en) | Micrometer connects pole, connects rod -type inside micrometer and foundation ditch center to measure structure | |
| CN116223879A (en) | Novel shaft voltage measuring tool universally applicable to hydraulic generator | |
| CN104635117B (en) | A kind of test method for evaluating breakdown voltage of transformer oil off field in high voltage direct current | |
| CN203455368U (en) | Current-leading structure for leakage current of porcelain insulator in shape of long bar | |
| CN208984744U (en) | A kind of modified generator stator winding Surface potential measurement instrument | |
| CN115586373A (en) | Auxiliary device for testing direct current resistance of high-voltage side of transformer | |
| CN206921648U (en) | A kind of good low-pressure line-outgoing sleeve pipe of stationarity | |
| CN214374977U (en) | Telescopic generator shaft voltage measuring device | |
| CN212228611U (en) | Middle-high voltage wind power cable torsion testing device | |
| CN209496101U (en) | A kind of switchgear voltage-withstand test connector | |
| CN204884919U (en) | Novel insulating rod | |
| RU92544U1 (en) | ELECTRICAL EQUIPMENT INSULATION CONDITION DEVICE | |
| CN208458649U (en) | A kind of photoelectric micrometer device measuring large product verticality | |
| CN211402672U (en) | Novel scalable electrical test short circuit device | |
| CN208900293U (en) | A kind of wind-powered electricity generation lightning protection device suitable for karst landform environment | |
| CN87207483U (en) | Universal meters probe | |
| Garros et al. | Evaluation of insulation degradation of stressed XLPE cables | |
| CN207336642U (en) | A kind of cable semi-conductive shield layer resistivity measuring device | |
| CN216248078U (en) | Lightning protection detection recorder convenient to installation | |
| CN205404744U (en) | A electrode assembly for measuring composite insulator silicon rubber full skirt electrical strength | |
| CN214011342U (en) | Generator shaft voltage tester | |
| CN211927985U (en) | Portable return circuit resistance test pincers | |
| CN206206949U (en) | Chargeable portable support of checking meter | |
| CN212780894U (en) | Insulator detection connecting device and detection equipment |
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 |