CN207095730U - Temperature monitoring device for dry-type air-core reactor - Google Patents
Temperature monitoring device for dry-type air-core reactor Download PDFInfo
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- CN207095730U CN207095730U CN201720783917.2U CN201720783917U CN207095730U CN 207095730 U CN207095730 U CN 207095730U CN 201720783917 U CN201720783917 U CN 201720783917U CN 207095730 U CN207095730 U CN 207095730U
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Abstract
The utility model provides a temperature monitoring device for dry-type air-core reactor, the device including: the system comprises a plurality of pairs of temperature sensors, at least one data sampling processing module, a communication module and an upper computer; the temperature sensor collects temperature data of the upper end part and the lower end part of the air passage of the encapsulation room and outputs the temperature data to the data sampling processing module; the data sampling processing module uploads the corresponding temperature data and the sampling time node data to an upper computer through a communication module; and the upper computer calculates the change rate of the temperature data difference value of the upper end part and the lower end part of the air passage of the same packaging room as the temperature rise change rate, judges the occurrence of the initial or development fault of the dry type air-core reactor and gives an alarm of the initial or development fault. The utility model discloses can judge dry-type air-core reactor's initial stage or development phase trouble, realize discernment, monitoring, the early warning of dry-type air-core reactor initial stage and development phase trouble.
Description
Technical field
Technical field of electric power is the utility model is related to, more particularly to a kind of monitoring temperature for dry-type air-core reactor fills
Put.
Background technology
In technical field of electric power, supergrid, extra-high voltage grid have the ability of Large Copacity, long distance power transmission, are states
The core network of family's power Transmission.Dry-type air-core reactor played in network system compensating power, limiting short-circuit current,
The effect such as higher hamonic wave is filtered out, is one of important power equipment for ensureing power system stability operation.
Because dry-type air-core reactor for high-voltage fence is main out of doors, it is non-maintaining under the conditions of be on active service, operating mode is severe,
So cause dry-type air-core reactor Frequent Accidents.Statistics shows, causes being mainly shown as under high temperature for such reactor accident
Reactor deterioration in electrical insulation performance and vigorous combustion damage, especially the latter can spread to other electrical equipments, so as to trigger thing
Therefore endanger power grid security.Therefore, effective monitoring reactor operating temperature is to ensure the technology of dry-type air-core reactor stable operation
It is crucial.
Currently for the monitoring temperature of dry-type air-core reactor, the detection method used both at home and abroad has 5 classes：1st, it is distributed and
(patent publication No. is grating fiber optic thermometry：CN105679451A, CN204881907U and CN202793642U,
CN104344913A、CN105067145A)；(patent publication No. is 2 IR thermometries：CN104048766A、
CN203984091U、CN103698017A、CN202305017U、CN202928691U)；3 thermistors, electric thermo-couple temperature sensing
(patent publication No. is thermometry：CN105587679A, CN201464067U) (patent is public for 4 thermo-sensitive materials coating heat-sensitive variable colour method
The number of opening is：CN205719328U) (patent publication No. is 5 temperature-sensitive surface acoustic wave methods：CN102353473A).
Its principle is to supervise in real time by the change of the light wave of heat-sensitive sensor component, sound wave, electrical property, color etc.
Survey, the entirety or surface Working Temperature of monitoring reactor, alarm pre-warning signal is sent when detecting that temperature value exceeds threshold value.
Due to reactor arrangement outdoor service condition diversity and weather condition difference, temperature threshold setting is difficult.Therefore, existing temperature
Degree supervising device is confined to the alarm to the failure later stage from principle.But for the reactor arrangement that network system is on active service, go out
The essential characteristic of existing circuit (such as turn-to-turn short circuit class failure) failure be there is local fault, induce many places or serious local fault,
Failure of insulation causes equipment to be damaged, and it corresponds respectively to failure initial stage of reactor arrangement, period of expansion and damage phase.In failure
Initial stage and period of expansion, simply local temperature change, equipment bulk temperature change unobvious, and the damage phase equipment in failure is overall
Temperature, which drastically raises, insulating properties drastically deteriorate, spreads other electrical equipments triggers catastrophic failure, reactor arrangement failure damage
Ruin the phase to disaster actually occur between interval time generally in 30s~100s time frame.
In summary, existing monitoring temperature principle is mainly to provide the failure warning in the reactor arrangement damage phase, leaves for
Field technician takes redemption, the time safeguarded and means limited.Drastic delimitations Temperature monitoring technology is in power network, power train
Application and effect in system.Accordingly, it is desirable to provide a kind of technical scheme, when to reactor arrangement safe operation condition monitoring,
Effectively identification and early warning can be carried out to failure initial stage, the period of expansion of reactor arrangement.
Utility model content
Filled in order to solve the above technical problems, the utility model provides a kind of monitoring temperature for dry-type air-core reactor
Put, can interpolate that initial stage or the period of expansion failure of dry-type air-core reactor, and send initial stage or period of expansion fault alarm, it is real
Existing dry-type air-core reactor initial stage and identification, monitoring, the early warning of period of expansion failure.
A kind of device for monitoring temperature for dry-type air-core reactor provided by the utility model, includes：It is some to temperature
Spend sensor, at least one data sampling processing module, communication module, host computer；
Some every a pair of temperature sensors in temperature sensor, are separately positioned on dry-type air-core reactor not
With in air flue upper and lower end parts preset range between encapsulating；The temperature sensor, the temperature of air flue upper and lower end parts between being encapsulated for collection
Degrees of data is simultaneously converted into corresponding first electric signal output；
The data sampling processing module, it is electrically connected with the temperature sensor and communicates company with the communication module
Connect, for receiving first electric signal of temperature sensor output, and corresponding to first electric signal is converted into
Temperature data, time of the temperature data will be also obtained as sampling time node data, and by the temperature data and institute
Sampling time node data is stated to send to the communication module；
The communication module, it is connected with the upper machine communication, for receiving the temperature data and the sampling time
Node data is simultaneously forwarded to the host computer；
The host computer, for according to the temperature data and the sampling time node data, calculating between same encapsulating
The rate of change of the temperature data difference of air flue upper and lower end parts is as temperature rise rate of change, when the temperature rise rate of change exceedes default change
During rate value, then dry-type air-core reactor early period of origination or period of expansion failure are judged, and send initial stage or period of expansion failure
Alarm.
Preferably, in addition to：
High pressure electricity-fetching module, it is electrically connected with the data sampling processing module, for being described from high-tension bus-bar power taking
Data sampling processing module is powered.
Preferably, the data sampling processing module includes：
Photoelectric isolation module, it is electrically connected with the temperature sensor, for receiving first electric signal and being put
Big processing, obtains the second electric signal output；
Analog-to-digital conversion module, it is electrically connected with the photoelectric isolation module, for receiving second electric signal and converting
Exported for corresponding data signal；
Signal transmitting module, communicate and connect with the communication module；
Processor, it is connected with the analog-to-digital conversion module, for receiving the data signal and being converted into corresponding described
Temperature data, time of the temperature data will be also obtained as sampling time node data, and by the temperature data and institute
Sampling time node data is stated to send to the communication module by the signal transmitting module.
Preferably, the temperature sensor is thermistor temperature sensor.
Preferably, in addition to：The star-like arm in top, the star-like arm in bottom；
The star-like arm in top and the star-like arm in the bottom are located at upper end, the lower end of dry-type air-core reactor respectively；It is described
Data sampling processing module and the quantity of the high pressure electricity-fetching module are two；
Wherein, the first data sampling processing module is each attached on the star-like arm in the top with the first high pressure electricity-fetching module,
And the first data sampling processing module respectively the first high pressure electricity-fetching module and encapsulating between air flue upper end the temperature
Sensor connection is spent, the second data sampling processing module is respectively between the second high pressure electricity-fetching module and encapsulating under air flue
The temperature sensor connection at end.
Preferably, the signal transmitting module is ZigBee sending modules, and the communication module is that ZigBee receives transmission
Establishment ZigBee-network progress data are led between module, the ZigBee sending modules and the ZigBee receive transport module
News.
Implement the utility model, have the advantages that：Set near upper and lower side by air flue between being encapsulated in reactor
Be set to thermistor temperature sensor, obtain the temperature data of the upper and lower part of air flue between the different encapsulating of reactor, by
The rate of change of the temperature data difference of air flue upper and lower end parts is as temperature rise rate of change between the same encapsulating of host computer calculating, when temperature rise becomes
When rate exceedes default rate of change value, then dry-type air-core reactor early period of origination or period of expansion failure are judged, and send just
Phase or period of expansion fault alarm, realize the initial stage of dry-type air-core reactor and identification, monitoring, the early warning of period of expansion failure.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the operation principle signal of the device for monitoring temperature provided by the utility model for dry-type air-core reactor
Figure.
Fig. 2 is the theory diagram of data sampling processing module provided by the utility model.
Embodiment
The utility model provides a kind of device for monitoring temperature for dry-type air-core reactor, as shown in figure 1, the device bag
Include：It is some to temperature sensor 2, at least one data sampling processing module 3, communication module 7, host computer 9.
Some every a pair of temperature sensors 2 in temperature sensor 2, it is separately positioned on the difference of dry-type air-core reactor
Between encapsulating in the upper and lower end parts preset range of air flue 1；Temperature sensor 2 is used for the temperature number of the upper and lower end parts of air flue 1 between collection encapsulating
According to and the first electric signal output corresponding to being converted into.
Every a pair of temperature sensors 2 are respectively positioned between same encapsulating in air flue 1, and one of temperature sensor 2 is arranged on bag
Between envelope near the upper end of air flue 1, the temperature data of the upper end of air flue 1, another temperature sensor 2 are arranged on encapsulating between collection encapsulating
Between air flue 1 lower end, collection encapsulating between the both under air of air flue 1 temperature data, between the logarithm of temperature sensor 2 and encapsulating
The quantity of air flue 1 is corresponding, for example, air flue 1 has 5 between encapsulating, temperature sensor 2 is then 5 pairs.
Data sampling processing module 3 is electrically connected with temperature sensor 2, and is communicated and connected with communication module 7, for receiving
The first electric signal that temperature sensor 2 exports, and the first electric signal is converted into corresponding temperature data, it will also obtain temperature number
According to time sent as sampling time node data, and by temperature data and sampling time node data to communication module 7.
Communication module 7 connects with the communication of host computer 9, for receiving temperature data and sampling time node data and being forwarded to
Host computer 9.
Host computer 9 is used for according to temperature data and sampling time node data, calculates the upper and lower end parts of air flue 1 between same encapsulating
Temperature data difference rate of change as temperature rise rate of change, when temperature rise rate of change exceedes default rate of change value, then judge
Dry-type air-core reactor early period of origination or period of expansion failure, and send initial stage or period of expansion fault alarm.Wherein, host computer
9 these operations performed can be realized by hardware circuit.
Further, the device for monitoring temperature for dry-type air-core reactor also includes：High pressure electricity-fetching module 4.
High pressure electricity-fetching module 4 is electrically connected with data sampling processing module 3, for from high-tension bus-bar power taking, being adopted for data
Sample processing module 3 is powered.Wherein, high pressure electricity-fetching module 4 is using the commercialization module for meeting reactor military service condition of work, communication
485 agreements are supported, its output voltage 9V~36V, rated output power 3W~15W.
Further, as shown in Fig. 2 data sampling processing module 3 includes：Photoelectric isolation module 31, analog-to-digital conversion mould
Block 32, signal transmitting module 33, processor 34.
Photoelectric isolation module 31 is electrically connected with temperature sensor 2, for receiving the first electric signal and carrying out enhanced processing,
Obtain the second electric signal output.
Analog-to-digital conversion module 32 is electrically connected with photoelectric isolation module 31, for receiving the second electric signal and being converted into correspondingly
Data signal output.In general, the first electric signal and the second electric signal are voltage signal.
Signal transmitting module 33 connects with the communication of communication module 7.
Processor 34 is connected with analog-to-digital conversion module 32, for receiving data signal and being converted into corresponding temperature data,
Also the time for obtaining temperature data is passed through as sampling time node data, and by temperature data and sampling time node data
Signal transmitting module 33 is sent to communication module 7.Wherein, processor 34 can use CPU single-chip microcomputers, more specifically, using DSP
Single-chip microcomputer.
Preferably, high pressure electricity-fetching module 4 supplies for the signal transmitting module 33 in data sampling processing module 3 and processor 34
Electricity.
Further, temperature sensor 2 is thermistor temperature sensor, more specifically, sealing NTC temperature-sensitives for the glass of MF 58
Resistive element, thermometric temperature include -50 DEG C~200 DEG C of temperature range, 0.01~0.1 sample of sampling rate/s.
Further, the device for monitoring temperature for dry-type air-core reactor also includes：The star-like arm 5 in top, bottom are star-like
Arm 6.
The star-like arm 6 of the star-like arm 5 in top and bottom is located at upper end, the lower end of dry-type air-core reactor respectively；At data sampling
The quantity for managing module 3 and high pressure electricity-fetching module 4 is two.
Wherein, the first data sampling processing module is each attached on the star-like arm 5 in top with the first high pressure electricity-fetching module, and the
The temperature sensor 2 of the upper end of air flue 1 is connected one data sampling processing module between the first high pressure electricity-fetching module and encapsulating respectively, the
The temperature sensor 2 of the lower end of air flue 1 is connected two data sampling processing modules between the second high pressure electricity-fetching module and encapsulating respectively.
Further, signal transmitting module 33 is ZigBee sending modules, and communication module 7 is that ZigBee receives transmission mould
Block, ZigBee sending modules and ZigBee set up ZigBee-network progress data communication between receiving transport module so that communication
Between module 7 and data sampling processing module 3 high-voltage isolating, Yi Jishi are realized by the way of ZigBee communications protocol transfers
When communication and flexible networking.Wherein, ZigBee communication frequency bands 0.8GHz~2.8GHz, ZigBee communication distance are 50~100m,
Communications protocol uses ModBus frameworks, and ZigBee receives transport module using the commercialization mould for meeting reactor military service condition of work
Block, communications protocol support 485 agreements.
Preferably, connected between communication module 7 and host computer 9 by communication cable 8, the communication cable 8 uses commercialization
The two-core cable with shielding construction, the two-core cable support 485 agreements.
In another embodiment of device for monitoring temperature provided by the utility model for dry-type air-core reactor, dry type is empty
Rated voltage 500kV, rated capacity 5000kVA, rated current 247A, the inductance ratings 260mH of core device, working frequency are
50Hz.The setting of search coil is the same as shown in Fig. 1.
It is each in the top of reactor, bottom wiring arm neighbouring position, 4 adjacent air intake ducts including air feeding in center road
From thermistor temperature sensor is correspondingly arranged, each dispose data sampling processing module 3 and CV high on top, bottom wiring arm
Electricity-fetching module 4 is pressed, forms the concurrent working of double loop independence.
Data sampling processing module 3 carries out the temperature data sampling of respective corresponding air intake duct, and the speed of sampling is 0.01
~0.1 sample/s, can be to each on the corresponding temperature signal Ti for the upper and lower part for obtaining reactor difference air flue, under Ti
Air intake duct bottom, upper temp carry out on-line real-time measuremen.
Sampling time node data and said temperature data are received by Zigbee protocol individual transmission to ZigBee to be transmitted
Module realizes high-voltage isolating, and transmission of wireless signals distance is no more than 50m.Then transport module is received by ZigBee and passes through 485
The communication cable of agreement is sent to long-range host computer 9 in the lump at a distance, and further data processing and signal are carried out by host computer 9
Identification.In this example, 4 groups of temperature datas comprising timing node up and down are shared and are sent to host computer 9, it is real-time by host computer 9
Corresponding upper airways, bottom temperature data Ti on, under Ti carry out difference obtain different encapsulatings temperature rise Δ Ti, Δ Ti
Under the upper-Ti of=Ti, and unit interval step-length Δ t temperature rise rate of change Gi, Gi=Δ Ti/ Δ t, then further Gi is carried out
The data statistics computings such as average Ei, deviation Si, variances sigma i, commenting for reactor working condition is carried out according to Confidence interval analysis principle
Valency and related early warning, actuation of an alarm.
Under nominal situation, surface area Ai, the coefficient of heat transfer hi and thermal power Qi of each encapsulating of reactor are certain, corresponding each bag
The temperature rise Δ T=Qi/ (hi*Ai) of air flue 1 each tends to constant value between envelope, and its temperature rise rate of change Gi tends to 0, when reactor due to
Between turn-to-turn short circuit, encapsulating during the work condition abnormality such as circulation, the temperature rise Δ Ti of air flue 1 can gradually rise between corresponding encapsulating, and its temperature rise
Rate of change Gi then can outlet significantly mutation and fluctuation peak value, thus it is readily discernible and judge, can be in reactor work condition abnormality
The generation phase (i.e. initial stage) and period of expansion timely early warning, while can also provide failure generation encapsulating positional information.On in addition,
Position machine 9 can also be easy to carry out electricity at any time by sampled data and statistical analysis relevant feature parameters by SQL database storage management
Anti- device running status historical analysis and further data exchange, Treatment Analysis.
Estimating Confidence Interval principle based on random process data processing, as deviation Si>(in formula, k is confidence system during k σ i
Number, k span is 2~5), show that reactor is in the failure generation phase of temperature anomaly, the frequency that the failure occurs is got over
Height, show that its temperature anomaly is very serious, reactor runs the danger for facing major accident.
The utility model is applied to abnormal in early stage failure (the i.e. incipient failure and period of expansion event of dry-type air-core reactor operating mode
Barrier) identification and monitoring and warning, be arranged near the upper and lower side by air flue between being encapsulated in reactor 1 to thermistor temp
Sensor, the temperature data of the top and bottom of air flue 1 between the different encapsulatings of acquisition reactor, by carrying out difference and statistics to it
Calculate, obtain the reactor temperature rise Δ Ti unrelated with environment temperature and its with time temperature rise rate of change Gi, and temperature rise rate of change Gi
Data distribution, then, using confidential interval statistical analysis principle, the temperature rise rate of change of air flue 1 each encapsulating of reactor
On-line real time monitoring is carried out, judges the initial stage corresponding to the abnormality of reactor operating temperature and period of expansion fault-signal, it is real
Identification, monitoring, the early warning at existing Reactor Fault initial stage and period of expansion.Carry out being wirelessly transferred realization height using ZigBee signals simultaneously
Voltage is isolated, and ensures the functional reliability and security of reactor arrangement from principle.
Said apparatus not only has height adaptive, sensitivity and reliability, while causes Reactor Fault, abnormal work
Continuous effective monitoring and early warning can be obtained with period of expansion in the early stage by making state, for extra-high voltage, super-pressure, high-voltage fence dry type
The health operation of air reactor provides reliable guarantee.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (6)
1. a kind of device for monitoring temperature for dry-type air-core reactor, it is characterised in that include：It is some to temperature sensor
(2), at least one data sampling processing module (3), communication module (7), host computer (9)；
Every a pair of temperature sensors (2) in some (2) to temperature sensor, are separately positioned on dry-type air-core reactor
Between difference encapsulating in air flue (1) upper and lower end parts preset range；The temperature sensor (2), air flue (1) between being encapsulated for collection
The temperature data of bottom is simultaneously converted into corresponding first electric signal output；
The data sampling processing module (3), it is electrically connected with the temperature sensor (2) and logical with the communication module (7)
News connection, for receiving first electric signal of the temperature sensor (2) output, and first electric signal is converted into
Corresponding temperature data, time of the temperature data will be also obtained as sampling time node data, and by the temperature number
Sent according to the sampling time node data to the communication module (7)；
The communication module (7), communicate and connect with the host computer (9), during for receiving the temperature data and the sampling
Segmentum intercalaris point data is simultaneously forwarded to the host computer (9)；
The host computer (9), for according to the temperature data and the sampling time node data, calculating gas between same encapsulating
The rate of change of the temperature data difference of road (1) upper and lower end parts is as temperature rise rate of change, when the temperature rise rate of change is more than default
During rate of change value, then dry-type air-core reactor early period of origination or period of expansion failure are judged, and send initial stage or period of expansion event
Barrier alarm.
2. the device for monitoring temperature according to claim 1 for dry-type air-core reactor, it is characterised in that also include：
High pressure electricity-fetching module (4), it is electrically connected with the data sampling processing module (3), for from high-tension bus-bar power taking, for institute
State data sampling processing module (3) power supply.
3. the device for monitoring temperature according to claim 1 for dry-type air-core reactor, it is characterised in that the data
Sampling processing module (3) includes：
Photoelectric isolation module (31), it is electrically connected with the temperature sensor (2), for receiving first electric signal and carrying out
Enhanced processing, obtain the second electric signal output；
Analog-to-digital conversion module (32), it is electrically connected with the photoelectric isolation module (31), for receiving second electric signal simultaneously
Data signal output corresponding to being converted into；
Signal transmitting module (33), communicate and connect with the communication module (7)；
Processor (34), it is connected with the analog-to-digital conversion module (32), for receiving the data signal and being converted into corresponding
The temperature data, time of the temperature data will be also obtained as sampling time node data, and by the temperature data
Sent with the sampling time node data by the signal transmitting module (33) to the communication module (7).
4. the device for monitoring temperature according to claim 1 for dry-type air-core reactor, it is characterised in that the temperature
Sensor (2) is thermistor temperature sensor.
5. the device for monitoring temperature according to claim 2 for dry-type air-core reactor, it is characterised in that also include：
The star-like arm in top (5), the star-like arm in bottom (6)；
The star-like arm of the star-like arm in top (5) and the bottom (6) is located at upper end, the lower end of dry-type air-core reactor respectively；Institute
The quantity for stating data sampling processing module (3) and the high pressure electricity-fetching module (4) is two；
Wherein, the first data sampling processing module is each attached on the star-like arm in the top (5) with the first high pressure electricity-fetching module, and
The first data sampling processing module respectively the first high pressure electricity-fetching module and encapsulating between air flue (1) upper end the temperature
Spend sensor (2) connection, the second data sampling processing module respectively the second high pressure electricity-fetching module and encapsulating between air flue (1) lower end
The temperature sensor (2) connection.
6. the device for monitoring temperature according to claim 3 for dry-type air-core reactor, it is characterised in that the signal
Sending module (33) is ZigBee sending modules, and the communication module (7) is that ZigBee receives transport module, the ZigBee hairs
Module and the ZigBee is sent to receive establishment ZigBee-network progress data communication between transport module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720783917.2U CN207095730U (en) | 2017-06-30 | 2017-06-30 | Temperature monitoring device for dry-type air-core reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720783917.2U CN207095730U (en) | 2017-06-30 | 2017-06-30 | Temperature monitoring device for dry-type air-core reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207095730U true CN207095730U (en) | 2018-03-13 |
Family
ID=61554613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720783917.2U Active CN207095730U (en) | 2017-06-30 | 2017-06-30 | Temperature monitoring device for dry-type air-core reactor |
Country Status (1)
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| CN (1) | CN207095730U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131968A (en) * | 2017-06-30 | 2017-09-05 | 深圳供电局有限公司 | Temperature monitoring device and method for dry-type air-core reactor |
| CN117804636A (en) * | 2024-02-29 | 2024-04-02 | 辽宁芯峻电气有限公司 | Internal temperature measuring device of air-core reactor |
-
2017
- 2017-06-30 CN CN201720783917.2U patent/CN207095730U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131968A (en) * | 2017-06-30 | 2017-09-05 | 深圳供电局有限公司 | Temperature monitoring device and method for dry-type air-core reactor |
| CN117804636A (en) * | 2024-02-29 | 2024-04-02 | 辽宁芯峻电气有限公司 | Internal temperature measuring device of air-core reactor |
| CN117804636B (en) * | 2024-02-29 | 2024-04-30 | 辽宁芯峻电气有限公司 | Internal temperature measuring device of air-core reactor |
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