CN113916395A - Wireless temperature measuring device for live installation of transformer substation - Google Patents

Wireless temperature measuring device for live installation of transformer substation Download PDF

Info

Publication number
CN113916395A
CN113916395A CN202111208490.0A CN202111208490A CN113916395A CN 113916395 A CN113916395 A CN 113916395A CN 202111208490 A CN202111208490 A CN 202111208490A CN 113916395 A CN113916395 A CN 113916395A
Authority
CN
China
Prior art keywords
shell
rod
temperature measuring
circuit board
thermistor
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
Application number
CN202111208490.0A
Other languages
Chinese (zh)
Inventor
李迎涛
李逸铭
侯超
李乐
朱剑
尤骥
王涣尧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Original Assignee
State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch filed Critical State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Priority to CN202111208490.0A priority Critical patent/CN113916395A/en
Publication of CN113916395A publication Critical patent/CN113916395A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention relates to a wireless temperature measuring device for live installation of a transformer substation, which comprises a temperature measuring front end, an extension and a host, wherein the temperature measuring front end, the extension and the host are connected in a wireless mode, the temperature measuring front end comprises a shell, an opening is formed in one end of the shell, a thermistor and a radio frequency circuit board are arranged in the shell, a functional end of the thermistor is connected with a metal column, the end part of the metal column is tightly attached to the functional end of the thermistor, a bottom shell is arranged at the opening, the opening is sealed by the bottom shell, a through hole for extending the thermistor is formed in the center of the bottom shell, and a battery is further arranged in the shell to supply power to the temperature measuring front end. Compared with the prior art, the invention firstly directly contacts the temperature measurement front end with the component, so that the temperature measurement precision is obviously improved; the insulating rod is arranged between the operating part and the control part on the handle, so that the personal safety of operators can be guaranteed, and the components and parts are grabbed through the pawls, so that the testing process is more stable.

Description

Wireless temperature measuring device for live installation of transformer substation
Technical Field
The invention relates to a temperature measuring device, in particular to a temperature measuring device for measuring the surface temperature of a transformer substation component.
Background
The transformer substation is a place for converting high-voltage current transmitted by a high-voltage power transmission circuit into suitable voltage current used by daily electric appliances, and the working temperature of components in the transformer substation becomes an important index for judging whether the components work normally or not because the current can generate a large amount of heat in the transmission process. Most of transformer substation temperature measuring devices on the market carry out remote measurement at a far distance through a temperature sensor, the measuring error is large, if a temperature sensing device is directly arranged on the surface of a component, the service life of the temperature sensing device cannot be guaranteed under the action of high temperature, and the method for measuring the temperature accurately only temporarily closes the power transformation work to enter the daily maintenance, and then measures the temperature of the component, so that the safety of operation and maintenance personnel is guaranteed. Therefore, the power utilization area covered by the transformer substation must be powered off, so that a large amount of economic loss is caused, and much inconvenience is brought to the daily life of residents in the power utilization area.
Disclosure of Invention
The invention aims to provide a wireless temperature measuring device capable of being installed in an electrified mode, which can improve the temperature measuring accuracy firstly, does not need to be powered off in the temperature measuring process and does not cause extra economic loss.
The invention is realized by adopting the following technical means: the utility model provides a wireless temperature measuring device of electrified installation of transformer substation, temperature measuring device include temperature measurement front end, extension and host computer, temperature measurement front end, extension and host computer all connect through wireless mode, the temperature measurement front end include the shell, the shell sets up the opening in one end, sets up thermistor and radio frequency circuit board in the shell, thermistor's function end connect a metal post, the tip of metal post closely laminates with thermistor's function end the opening part set up the drain pan, the drain pan seal the opening, set up the perforation that heat supply thermistor stretches out in drain pan central authorities, still set up the battery in the shell and do the power supply of temperature measurement front end.
The protective sleeve is wrapped on the outer side of the metal column, a disc is fixedly arranged at the front end of the protective sleeve, a magnet is sleeved on the outer side of the protective sleeve, the outer diameter of the magnet is the same as the diameter of the disc, the width of the magnet is the same as the length of the protective sleeve, the radio frequency circuit board is fixedly arranged on the inner side of the rear side wall of the shell through screws, a support frame is arranged on the top wall of the shell, and the support frame fixes the battery.
The waterproof rubber sheet is arranged on the contact surface of the shell and the bottom shell, and the length of the metal column is slightly larger than the sum of the length of the protective sleeve and the width of the disc.
Set up the drum that supplies the screw to pass on four angles of the inner wall of shell, four angles of drain pan and four corresponding positions in waterproof film set up the through-hole that supplies the screw to pass.
The protective sleeve is an aluminum silicate protective sleeve, and the metal column is a red copper column.
The temperature measuring front end is arranged on the insulating mechanical claw, the insulating mechanical claw comprises an insulating rod, a handle is arranged at the rear end of the insulating rod, the mechanical claw and a telescopic motor are arranged at the front end of the insulating rod, and the mechanical claw is movably connected with the telescopic motor through a connecting rod.
Set up the button on the handle, the inside cavity of handle sets up the circuit board in the handle inside, the button is connected with the circuit board electricity, flexible motor on set up motor control panel, the circuit board passes through radio frequency signal communication with motor control panel, sets up the battery respectively in circuit board and motor control panel department and supplies power for circuit board, motor and motor control panel.
The telescopic motor is characterized by further comprising a coupler and a power rod, wherein the coupler is arranged on the action end of the telescopic motor and is fixedly connected with the rear end of the rod part of the power rod; the connecting rod is arranged at the rear part of each mechanical claw, the other end of the connecting rod is rotatably connected with the front end of the rod part of the power rod, and the end part of the power rod is also provided with a pawl for fixing the front end of the temperature measurement.
The motor is arranged in a motor shaft sleeve, and the handle, the motor shaft sleeve and the insulating rod are connected through threads.
Compared with the prior art, the invention firstly directly contacts the temperature measurement front end with the component, so that the temperature measurement precision is obviously improved; the insulating rod is arranged between the operating part and the control part on the handle, so that the personal safety of operators can be guaranteed, and the components and parts are grabbed through the pawls, so that the testing process is more stable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded view of a temperature measurement front end structure;
FIG. 3 is a schematic view of the structure of an insulating mechanical claw;
fig. 4 is an exploded view of the insulated mechanical claw of the present invention.
In the figure: 1. the temperature measuring device comprises a temperature measuring front end, a 2-extension machine, a 3-host machine, a1.1 screw A, a 1.2 red copper column, a 1.3 aluminum silicate protective sleeve, a 1.4 strong magnet, a 1.5 plastic bottom shell, a 1.6 waterproof film, a 1.7 thermistor, a1.8 battery A, a 1.9 supporting frame, a 1.10 screw B, a 1.11 radio frequency circuit board, a 1.12 plastic shell, a 1.2 red copper column, a 1.3 aluminum silicate protective sleeve, A4-insulating mechanical claw, a 4.1 rear cover, a 4.2 battery B, a4.3 circuit board A, a 4.4 button, a 4.5 handle, a 4.6 insulating rod, a 4.7 pair of lock bolts, a 4.8 battery c, a 4.9 motor control board, a 4.10 screw c, a 4.11 telescopic motor, a 4.12 coupler, a 4.13 motor shaft sleeve, a 4.14 bolt, a 4.15 mechanical claw chassis, a 4.16 connecting rod, a 4.17 mechanical claw and a 4.18 power rod.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention relates to a temperature measuring device, in particular to a temperature measuring device for measuring the surface temperature of components of a transformer substation in the transformer substation, which comprises a temperature measuring front end 1, an extension set 2 and a host 3, wherein the temperature measuring front end 1, the extension set 2 and the host 3 are connected in a wireless mode, in particular, each transformer substation is provided with one extension set 2 to monitor all the temperature measuring front ends 1 in the transformer substation, and then each extension set 2 sends data to the host 3 for overall monitoring.
In the invention, the temperature measurement front end 1 comprises a shell, an opening is arranged at one end of the shell, a thermistor 1.7 and a radio frequency circuit board 1.11 are arranged in the shell, a functional end of the thermistor is connected with a metal column, the end part of the metal column is tightly attached to the functional end of the thermistor 1.7, the thermistor is connected with the radio frequency circuit board and transmits the obtained signal through the radio frequency circuit board, a bottom shell is arranged at the opening, the bottom shell seals the opening, a through hole for extending the thermistor is arranged in the center of the bottom shell, and a battery A1.8 is also arranged in the shell to supply power for the temperature measurement front end.
Specifically, the metal column outside parcel lag, the front end of lag is fixed and is set up the disc, cup joints a magnet in the outside of lag, the external diameter of magnet is the same with the diameter of disc, and the width of magnet is the same with the length of lag, the radio frequency circuit board pass through the fixed back lateral wall inboard that sets up at the shell of screw B1.10, set up the support frame on the shell roof, the support frame fix the battery.
Furthermore, a waterproof rubber sheet 1.6 is arranged on the contact surface of the shell and the bottom shell, and the length of the metal column is slightly larger than the sum of the length of the protective sleeve and the width of the disc, so that moisture can be prevented from entering the shell in work and affecting the normal operation of internal electrical elements.
In the invention, cylinders for the screws A1.1 to pass through are arranged at four corners of the inner wall of the shell, and through holes for the screws A1.1 to pass through are arranged at the positions corresponding to the four corners of the bottom shell and the waterproof film.
More specifically, the protecting sleeve is an aluminum silicate protecting sleeve 1.3, the metal column is a red copper column 1.2, the red copper column 1.2 has good heat conducting performance, the aluminum silicate protecting sleeve 1.3 has good heat insulating performance, the accuracy of temperature measurement can be fully guaranteed, and the magnet is strong magnetism 1.4.
According to the invention, the temperature measurement front end is arranged on the insulating mechanical claw 4, the insulating mechanical claw 4 comprises an insulating rod 4.6, the rear end of the insulating rod 4.6 is provided with a handle 4.5, the front end of the insulating rod 4.6 is provided with a mechanical claw 4.17 and a telescopic motor 4.11, the mechanical claw 4.17 is movably connected with the telescopic motor 4.11 through a connecting rod 4.16, and an operator can contact the temperature measurement front end with a component by operating the insulating mechanical claw 4, so that the personal safety of the operator is ensured.
According to the invention, a button 4.4 is arranged on a handle 4.5, the handle 4.5 is hollow, a circuit board A4.3 is arranged inside the handle 4.5, the button 4.4 is electrically connected with the circuit board A4.3, a motor control board 4.9 is arranged on a telescopic motor 4.11, the circuit board A4.3 is communicated with the motor control board 4.9 through radio frequency signals, and a battery b4.2 and a battery c4.8 are respectively arranged at the circuit board A4.3 and the motor control board 4.9 to supply power to the circuit board A4.3, the telescopic motor 4.11 and the motor control board 4.9.
In the invention, the handle 4.5 and the telescopic motor 4.11 are connected with the insulating rod 4.6 through threads, so that the replacement at the later stage is convenient, meanwhile, the connection is carried out by using the threads, and the handle can also be used as an opening of a battery bin by using the connection part, so that the installation and the use are convenient. Further, the handle outside parcel insulating layer, the insulating layer through locking bolt 4.7 and handle laminating.
In the invention, the telescopic motor 4.11, the motor control board 4.9 and the battery C4.8 are arranged in a battery shaft sleeve 4.13, the telescopic motor 4.11 is fixed with the battery shaft sleeve 4.13 through a screw C4.10, and the telescopic motor 4.11, the battery shaft sleeve and the battery shaft sleeve are combined into a whole, thereby being convenient for installation and maintenance.
The insulating mechanical claw further comprises a coupler 4.12 and a power rod 4.18, wherein the coupler 4.12 is arranged at the action end of a telescopic motor 4.11, and the coupler 4.12 is fixedly connected with the rear end of the rod part of the power rod 4.18; the rear part of each mechanical claw is provided with one connecting rod 4.16, the other end of each connecting rod 4.16 is rotatably connected with the front end of the rod part of the power rod 4.18, and the end part of the power rod 4.18 is also provided with a pawl for fixing the front end of the temperature measurement.
The mechanical claw is arranged on a mechanical claw chassis 4.15, the front end of the coupler 4.12 extends into the mechanical claw chassis 4.15, the rear end of the rod part of the power rod 4.18 also penetrates into the mechanical claw chassis 4.15, and the mechanical claw and the power rod are fixedly connected in the mechanical claw chassis 4.15.

Claims (9)

1. The utility model provides a wireless temperature measuring device of electrified installation of transformer substation, temperature measuring device include temperature measurement front end, extension and host computer, temperature measurement front end, extension and host computer all connect its characterized in that through wireless mode: the temperature measurement front end comprises a shell, an opening is formed in one end of the shell, a thermistor and a radio frequency circuit board are arranged in the shell, a metal column is connected with the functional end of the thermistor, the end portion of the metal column is tightly attached to the functional end of the thermistor, a bottom shell is arranged at the opening, the opening is sealed by the bottom shell, a through hole extending out of the thermistor is formed in the center of the bottom shell, and a battery is further arranged in the shell to supply power to the temperature measurement front end.
2. The wireless thermometry device of claim 1, wherein: the protective sleeve is wrapped on the outer side of the metal column, a disc is fixedly arranged at the front end of the protective sleeve, a magnet is sleeved on the outer side of the protective sleeve, the outer diameter of the magnet is the same as the diameter of the disc, the width of the magnet is the same as the length of the protective sleeve, the radio frequency circuit board is fixedly arranged on the inner side of the rear side wall of the shell through screws, a support frame is arranged on the top wall of the shell, and the support frame fixes the battery.
3. The wireless thermometry device of claim 1, wherein: the waterproof rubber sheet is arranged on the contact surface of the shell and the bottom shell, and the length of the metal column is slightly larger than the sum of the length of the protective sleeve and the width of the disc.
4. The wireless thermometry device of claim 3, wherein: set up the drum that supplies the screw to pass on four angles of the inner wall of shell, four angles of drain pan and four corresponding positions in waterproof film set up the through-hole that supplies the screw to pass.
5. The wireless thermometry device of claim 2, wherein: the protective sleeve is an aluminum silicate protective sleeve, and the metal column is a red copper column.
6. The wireless thermometry device of claim 1, wherein: the temperature measuring front end is arranged on the insulating mechanical claw, the insulating mechanical claw comprises an insulating rod, a handle is arranged at the rear end of the insulating rod, the mechanical claw and a telescopic motor are arranged at the front end of the insulating rod, and the mechanical claw is movably connected with the telescopic motor through a connecting rod.
7. The wireless thermometry device of claim 6, wherein: set up the button on the handle, the inside cavity of handle sets up the circuit board in the handle inside, the button is connected with the circuit board electricity, flexible motor on set up motor control panel, the circuit board passes through radio frequency signal communication with motor control panel, sets up the battery respectively in circuit board and motor control panel department and supplies power for circuit board, motor and motor control panel.
8. The wireless thermometry device of claim 6, wherein: the telescopic motor is characterized by further comprising a coupler and a power rod, wherein the coupler is arranged on the action end of the telescopic motor and is fixedly connected with the rear end of the rod part of the power rod; the connecting rod is arranged at the rear part of each mechanical claw, the other end of the connecting rod is rotatably connected with the front end of the rod part of the power rod, and the end part of the power rod is also provided with a pawl for fixing the front end of the temperature measurement.
9. The wireless thermometry device of claim 6, wherein: the motor is arranged in a motor shaft sleeve, and the handle, the motor shaft sleeve and the insulating rod are connected through threads.
CN202111208490.0A 2021-10-18 2021-10-18 Wireless temperature measuring device for live installation of transformer substation Pending CN113916395A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111208490.0A CN113916395A (en) 2021-10-18 2021-10-18 Wireless temperature measuring device for live installation of transformer substation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111208490.0A CN113916395A (en) 2021-10-18 2021-10-18 Wireless temperature measuring device for live installation of transformer substation

Publications (1)

Publication Number Publication Date
CN113916395A true CN113916395A (en) 2022-01-11

Family

ID=79241076

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111208490.0A Pending CN113916395A (en) 2021-10-18 2021-10-18 Wireless temperature measuring device for live installation of transformer substation

Country Status (1)

Country Link
CN (1) CN113916395A (en)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103674292A (en) * 2013-10-18 2014-03-26 国家电网公司 Temperature detecting method and apparatus for devices of transformer station
CN203929246U (en) * 2013-10-18 2014-11-05 国家电网公司 Substation equipment temperature-detecting device
CN106017706A (en) * 2016-07-01 2016-10-12 国网山东省电力公司淄博供电公司 Live installation device for cable clamp temperature monitoring device of high-voltage line
CN106441609A (en) * 2015-08-10 2017-02-22 秦骏(上海)实业有限公司 Combined wireless RF temperature measuring device
CN207423393U (en) * 2017-11-24 2018-05-29 常熟开关制造有限公司(原常熟开关厂) A kind of wireless temperature-measuring terminal
CN207689020U (en) * 2017-11-22 2018-08-03 向英特 A kind of sucked type temperature alarm
CN207779259U (en) * 2017-12-28 2018-08-28 四川飞亚动力科技股份有限公司 A kind of self-centering measuring device of automobile connecting bar
CN208333709U (en) * 2018-07-05 2019-01-04 佛山市双阳电子有限公司 A kind of hand-held temperature meter
CN210268939U (en) * 2019-09-29 2020-04-07 大唐环境产业集团股份有限公司 Handheld insulating rod type electrical equipment surface temperature measuring device
CN211121663U (en) * 2019-12-13 2020-07-28 上海博翔电器仪表有限公司 Big handle type thermocouple
CN112345095A (en) * 2020-11-16 2021-02-09 山西世恒铁路技术有限公司 Portable steel rail thermometer and temperature measuring system thereof
CN212988611U (en) * 2020-09-07 2021-04-16 科姆勒电气(安徽)有限公司 High-voltage live online temperature measuring device
CN112729588A (en) * 2020-12-25 2021-04-30 山东省产品质量检验研究院 Miniature passive wireless temperature sensor and temperature measurement system

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103674292A (en) * 2013-10-18 2014-03-26 国家电网公司 Temperature detecting method and apparatus for devices of transformer station
CN203929246U (en) * 2013-10-18 2014-11-05 国家电网公司 Substation equipment temperature-detecting device
CN106441609A (en) * 2015-08-10 2017-02-22 秦骏(上海)实业有限公司 Combined wireless RF temperature measuring device
CN106017706A (en) * 2016-07-01 2016-10-12 国网山东省电力公司淄博供电公司 Live installation device for cable clamp temperature monitoring device of high-voltage line
CN207689020U (en) * 2017-11-22 2018-08-03 向英特 A kind of sucked type temperature alarm
CN207423393U (en) * 2017-11-24 2018-05-29 常熟开关制造有限公司(原常熟开关厂) A kind of wireless temperature-measuring terminal
CN207779259U (en) * 2017-12-28 2018-08-28 四川飞亚动力科技股份有限公司 A kind of self-centering measuring device of automobile connecting bar
CN208333709U (en) * 2018-07-05 2019-01-04 佛山市双阳电子有限公司 A kind of hand-held temperature meter
CN210268939U (en) * 2019-09-29 2020-04-07 大唐环境产业集团股份有限公司 Handheld insulating rod type electrical equipment surface temperature measuring device
CN211121663U (en) * 2019-12-13 2020-07-28 上海博翔电器仪表有限公司 Big handle type thermocouple
CN212988611U (en) * 2020-09-07 2021-04-16 科姆勒电气(安徽)有限公司 High-voltage live online temperature measuring device
CN112345095A (en) * 2020-11-16 2021-02-09 山西世恒铁路技术有限公司 Portable steel rail thermometer and temperature measuring system thereof
CN112729588A (en) * 2020-12-25 2021-04-30 山东省产品质量检验研究院 Miniature passive wireless temperature sensor and temperature measurement system

Similar Documents

Publication Publication Date Title
CN201532262U (en) High-voltage switch contact and bus on-line temperature measuring device
CN208847372U (en) Cable joint for ring main unit
CN201867270U (en) Wireless temperature measurement system used in high-voltage power environment
CN206804797U (en) The extra-high video sensor of external intelligence for GIS partial discharge detection
CN207636199U (en) The sheath assembly and temperature measurement system of temperature change for sensing end
CN201229210Y (en) Wireless temperature acquisition machine for switch cubicle
CN113916395A (en) Wireless temperature measuring device for live installation of transformer substation
CN108414895A (en) The real-time monitoring device of low-voltage circuit
CN202853762U (en) Suspension electricity acquiring device especially for medium-voltage intelligent wireless temperature measurement of breaker contact arm
CN218240367U (en) Device for sensing state of lead
CN109253815B (en) Wireless temperature sensor and application thereof
US20210072092A1 (en) Temperature measuring device and electric power system
CN111504498B (en) GIS isolating switch contact temperature on-line monitoring system
CN212458684U (en) High tension switchgear plum blossom contact temperature on-line monitoring sensor
CN210774146U (en) Integrated multisensor soil moisture content data acquisition device
CN108422885A (en) Main Control Tank, battery management system and electric vehicle
CN114459605A (en) Combined platform outdoor thermal infrared imager and use method thereof
CN210323920U (en) Intelligent bus temperature and humidity control system
CN219045995U (en) Self-power-taking plug temperature measurement sensor
CN208263992U (en) Main Control Tank, battery management system and electric vehicle
CN201903952U (en) Structure of high-voltage temperature online monitor wireless launching contact box
CN202601871U (en) All-insulation electric cable accessory capable of measuring temperature indirectly
CN212567712U (en) Nut type plug temperature measuring sensor
CN219455321U (en) Wireless temperature measuring device for high-voltage switch cabinet
CN207490500U (en) A kind of circuit distance protection 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