CN112349490A - Transformer with respiration monitoring control function - Google Patents
Transformer with respiration monitoring control function Download PDFInfo
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- CN112349490A CN112349490A CN202011210384.1A CN202011210384A CN112349490A CN 112349490 A CN112349490 A CN 112349490A CN 202011210384 A CN202011210384 A CN 202011210384A CN 112349490 A CN112349490 A CN 112349490A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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- Engineering & Computer Science (AREA)
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- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides a transformer with a respiration monitoring control function.A main gas circuit is arranged on a respirator; a drying cavity and an air control valve are arranged on the main air path; when the transformer is heated and expanded, redundant air in the conservator is exhaled through the main air path; when the oil temperature of the transformer is reduced, air is sucked in through the main air path, and the sucked air passes through the drying cavity, is dried and then enters the transformer; the processor is connected with the transformer oil temperature detection module, acquires oil temperature information of the transformer in the running state and stores the oil temperature information into the storage; and meanwhile, when the monitored oil temperature exceeds a preset threshold value, the monitoring oil temperature is connected with the air control valve through the valve control circuit to control the air control valve to be opened, so that the transformer performs ventilation. The invention solves the problem that the breathing state of the transformer cannot be effectively monitored, and realizes alarm processing when the breathing state of the transformer is monitored, abnormal breathing is judged, the oil level is abnormal and the like.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a transformer with a respiration monitoring control function.
Background
The transformer respirator mainly carries out drying and filtering to the inspiratory air of transformer, can produce more water among the respiratory process, simultaneously through rainy season, the respirator reserves water more, comes winter, can lead to the respirator to block up, causes the transformer to breathe the difficulty, and inside produces great pressure, reaches the certain degree at the temperature, and the respirator blocks up the ice crystal and melts, and transformer internal pressure releases in the twinkling of an eye, leads to heavy gas action, produces the tripping operation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a transformer with a respiration monitoring function, which comprises: the system comprises a transformer monitoring device, a breather and a conservator, wherein the transformer monitoring device is used for acquiring running state parameters of a transformer;
the respirator is provided with a main gas circuit; a drying cavity and an air control valve are arranged on the main air path;
when the transformer is heated and expanded, redundant air in the conservator is exhaled through the main air path;
when the oil temperature of the transformer is reduced, air is sucked in through the main air path, the sucked air passes through the drying cavity, and a drying agent is arranged in the drying cavity, so that the sucked air is dried and then enters the transformer;
the transformer monitoring device includes: the device comprises a processor, a transformer oil temperature detection module, a valve control circuit, an input/output module and a storage;
the processor is connected with the input and output module, outputs the information of the transformer, acquires the data information input by a user and executes the data information;
the processor is connected with the transformer oil temperature detection module, acquires oil temperature information of the transformer in the running state and stores the oil temperature information into the storage; and meanwhile, when the monitored oil temperature exceeds a preset threshold value, the monitoring oil temperature is connected with the air control valve through the valve control circuit to control the air control valve to be opened, so that the transformer performs ventilation.
It should be further noted that an air flow meter is also arranged on the main air path;
the air flow meter is connected with the processor, and the processor acquires the gas flow of the main gas circuit and controls the opening of the gas control valve through the valve control circuit.
It should be further noted that the transformer monitoring apparatus further includes: the device comprises a heating wire control circuit, an ambient temperature detection module and a humidity detection module;
the transformer is provided with an oil cup; the heating wire is arranged in the oil cup;
the processor is connected with the ambient temperature detection module to acquire ambient temperature information and store the ambient temperature information in the storage device;
the processor is connected with the humidity detection module to acquire environment humidity information and store the environment humidity information in the storage device;
the processor is connected with the heating wire through the heating wire control circuit, when the environmental humidity exceeds a threshold value, the heating wire is controlled to work, the heating wire is used for heating to remove moisture in the oil cup, and ice crystals in the respiratory orifice are melted.
It is further noted that the processor controls the opening of the air control valve through the following formula;
K＝(s1-s2)/s1*100％＝(M1–M2)/(M1-M0)*100％
s1 and M1 are the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature at the current time point;
s2 and M2 represent the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature in a normal state;
m0 is ambient temperature;
k is the opening of the air control valve.
It is further noted that the processor is further configured to obtain a preset oil temperature-oil level curve of the transformer;
after the transformer operates, acquiring time T, voltage V, current I, oil level and pressure data to form a mutual correlation curve;
and manufacturing a transformer health database;
comparing the running process data of the transformer with corresponding preset threshold values respectively;
and alarming and uploading to the monitoring center after the abnormity occurs.
It should be further noted that the transformer monitoring apparatus further includes: an oil level sensor;
the oil level sensor is arranged on the transformer, and the processor is connected with the oil level sensor to acquire the oil quantity state information of the transformer and store the information into the storage.
It should be further noted that the oil level sensor is provided with an oil level scale, and the oil level scale is arranged on an observation window of the transformer body;
the oil level scale is provided with scale marks, the scale marks are provided with reading units, when the oil level moves on the scale, two groups of pulses are generated, and each pulse represents one scale mark, so that the oil level value is obtained.
It should be further noted that the oil level sensor is a liquid level meter in a floating ball manner, a sliding resistance unit is additionally arranged in the floating ball type liquid level meter, and an oil level value is obtained according to the change of a resistance value.
It should be further noted that the transformer monitoring apparatus further includes: the transformer primary and secondary side voltage detection module and the transformer primary and secondary side current detection module are connected with the transformer primary and secondary side voltage detection module;
the transformer primary and secondary side voltage detection module and the transformer primary and secondary side current detection module are respectively connected with the processor.
It should be further noted that the transformer monitoring apparatus further includes: a wireless communication module;
the processor is connected with the monitoring center through the wireless communication module, uploads the operation data of the transformer to the monitoring center, and simultaneously obtains a control instruction of the monitoring center.
According to the technical scheme, the invention has the following advantages:
the invention solves the problem that the breathing state of the transformer cannot be effectively monitored, and realizes alarm processing when the breathing state of the transformer is monitored, abnormal breathing is judged, the oil level is abnormal and the like. The invention integrates the acquisition of temperature, voltage, current, oil level and environment temperature and humidity information of the transformer, and can be uploaded to a monitoring center to realize remote monitoring based on the requirement.
The invention can also control the opening of the air control valve according to the running state of the transformer to prevent sudden pressure change from influencing the normal running of the transformer. And then avoid the increase of transformer internal pressure, reach certain degree, inside bellows releases suddenly, leads to the tripping operation equally.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a transformer with a breath monitoring function;
FIG. 2 is a schematic view of a respirator;
FIG. 3 is a schematic view of a respirator embodiment;
FIG. 4 is a schematic diagram of an embodiment of a transformer with a respiration monitoring function;
FIG. 5 is a schematic view of the oil level scale;
FIG. 6 is a schematic view of the oil level scale, the scale lines and the reading unit;
FIG. 7 is a schematic view of a float-type level gauge.
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.
The present invention provides a transformer having a respiration monitoring control function, as shown in fig. 1 to 7, including: the device comprises a transformer monitoring device for acquiring running state parameters of the transformer 1, a breather 4 connected with the transformer 1 and an oil conservator 2 for supplying oil to the transformer;
the main gas circuit 5 is arranged on the respirator 4; the main gas path 5 is provided with a drying cavity 6 and a gas control valve 7;
when the transformer is heated and expanded, redundant air in the oil conservator 2 is exhaled through the main air path 5; when the oil temperature of the transformer is reduced, air is sucked in through the main air path 5, the sucked air passes through the drying cavity 6, a drying agent is arranged in the drying cavity 6, the sucked air is dried, and then the air enters the interior of the transformer; the desiccant is silicon material desiccant.
The transformer monitoring device includes: the system comprises a processor 11, a transformer oil temperature detection module 12, a valve control circuit 13, an input/output module 14 and a storage 15; the processor 11 is connected with the input/output module 14, outputs the information of the transformer, acquires the data information input by the user, and executes the data information; the processor 11 is connected with the transformer oil temperature detection module 12 to acquire oil temperature information of the transformer in the running state and store the oil temperature information into the storage 15; and meanwhile, when the monitored oil temperature exceeds a preset threshold value, the oil temperature is connected with the air control valve 7 through the valve control circuit 13, and the air control valve 7 is controlled to be opened, so that the transformer is ventilated.
The processor 11 may be implemented using at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, and an electronic unit designed to perform the functions described herein, and in some cases, such an implementation may be implemented in a controller. For a software implementation, the implementation such as a process or a function may be implemented with a separate software module that allows performing at least one function or operation. The software codes may be implemented by software applications (or programs) written in any suitable programming language, which may be stored in memory and executed by the controller.
The storage 15 can store data, so that a user can search historical data and check the past state of the transformer.
The input and output module 14 may include an operation interface, a display screen, a touch screen, and the like.
Suffixes such as "module", "means", or "unit" used for denoting elements for the present invention are used only for facilitating the description of the embodiments of the present invention, and have no specific meaning per se. Thus, "module" and "component" may be used in a mixture.
In order to facilitate the remote monitoring of the transformer status information, the transformer monitoring device further comprises: a wireless communication module; the processor 11 is connected to the monitoring center 22 through the wireless communication module 21, and uploads the operation data of the transformer to the monitoring center 22, and meanwhile, obtains a control instruction of the monitoring center.
Of course the transformer monitoring device may comprise a wireless communication unit, an audio/video (a/V) input unit, a user input unit, a sensing unit, an output unit, a memory, an interface unit, a controller and a power supply unit, etc. It is to be understood that not all illustrated components are required to be implemented.
The Wireless internet Access technology related to the Wireless communication module 21 may include a Wireless Local Area network (Wi-Fi, WLAN), a Wireless broadband (Wibro), a worldwide interoperability for microwave Access (Wimax), a High Speed Downlink Packet Access (HSDPA), and so on.
In order to connect the state information of the transformer, an air flow meter 8 is also arranged on the main air path 5; the air flow meter 8 is connected with the processor 11, and the processor 11 obtains the gas flow of the main gas path 5 and controls the opening of the gas control valve 7 through the valve control circuit 13.
Wherein, the processor 11 controls the opening of the air control valve 7 through the following formula;
K＝(s1-s2)/s1*100％＝(M1–M2)/(M1-M0)*100％
s1 and M1 are the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature at the current time point; s2 and M2 represent the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature in a normal state; m0 is ambient temperature; and K is the opening degree of the air control valve 7.
That is, the opening degree of the air control valve 7 is controlled based on the current ambient temperature, the oil temperature in the transformer operating state, and the preset normal oil temperature.
In other words, the invention improves the transformer respirator, and the drying cavity can drain and dry air inhaled by the transformer. The drying cavity can be internally provided with a heating device, and the main air path 5 can adopt a serpentine coil state so as to sufficiently heat and dry air. A plurality of desiccants may be provided and the drying may be performed a plurality of times.
When the transformer breathes and gathers, the air control valve is closed, and the air obtains breathing condition data through the flowmeter. And when the abnormity is detected, the air control valve is opened according to the preset opening degree, and the sudden breathing of the transformer is controlled to be slow breathing.
Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations thereof, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Further, the transformer monitoring device further comprises: a heating wire control circuit 16, an ambient temperature detection module 18, a humidity detection module 19, a transformer primary and secondary side voltage detection module, and a transformer primary and secondary side current detection module; (ii) a The transformer is provided with an oil cup; the heating wire 17 is arranged in the oil cup; the processor 11 is connected with the ambient temperature detection module 18 to obtain ambient temperature information and store the ambient temperature information in the storage 15; the processor 11 is connected with the humidity detection module 19 to acquire environmental humidity information and store the environmental humidity information in the storage 15; the processor 11 is connected with the heating wire 17 through the heating wire control circuit 16, when the environmental humidity exceeds the threshold value, the heating wire 17 is controlled to work, the heating wire 17 heats and removes the moisture of the oil in the oil cup, and the ice crystals of the respiratory orifice are melted.
The primary and secondary side voltage detection module and the primary and secondary side current detection module are respectively connected with the processor 11. This allows the current voltage of the transformer to be monitored. If the threshold value is exceeded, the alarm can be given in time.
As an embodiment provided by the present invention, the transformer monitoring apparatus further includes: a fuel level sensor 20; the oil level sensor 20 is disposed on the transformer, and the processor 11 acquires the transformer oil quantity state information by connecting with the oil level sensor 20 and stores the information into the storage 15.
As an embodiment provided by the present invention, the processor 11 is further configured to obtain a preset oil temperature-oil level curve of the transformer; namely, after the transformer operates, data of the voltage V, the current I, the oil level, the pressure and the like at all seasons of the time T are obtained to form a mutual correlation curve. And manufacturing a transformer health database. And comparing subsequent data. And after abnormity, alarming and uploading scheduling processing. When the abnormality is serious, the respirator and the drying function are started first, and the failure of the respirator is eliminated. The opening of the air control valve is controlled to prevent sudden pressure change.
As an embodiment provided by the present invention, the oil level sensor 20 is provided with an oil level scale 33, the oil level scale 33 being provided on the observation window of the transformer body; the oil level scale 33 is provided with scale lines 31 on which reading units 32 are provided, and when the oil level moves on the scale, two sets of pulses are generated, each representing one scale line 31, thereby acquiring the oil level value.
The invention is provided with an oil level detection digitalization mode. A vertically placed observation window is configured, and a scale mark 31 and a reading unit 32 are designed. The reading unit 32 reads the data information of the scale marks 31, and the reading unit 32 can generate two groups of pulses with different intervals and different pulse diagrams of forward and reverse rotation so as to measure the forward and reverse rotation, wherein each pulse represents one scale mark, so that the oil level value is read.
As an embodiment of the present invention, the oil level sensor 20 is a float-type level gauge, and the float-type level gauge is internally provided with a sliding resistance unit, and obtains an oil level value according to a change in a resistance value. Namely, a sliding resistance unit is adopted, a liquid level value is obtained according to the change of the resistance value, and the liquid level value is converted into industrial 0-20mA sensor data by a transmitter to be recorded.
Therefore, the invention solves the problem that the breathing state of the transformer cannot be effectively monitored, and realizes alarm processing when the breathing state of the transformer is monitored, abnormal breathing is judged, the oil level is abnormal and the like. The invention integrates the acquisition of temperature, voltage, current, oil level and environment temperature and humidity information of the transformer, and can be uploaded to a monitoring center to realize remote monitoring based on the requirement.
The invention can also control the opening of the air control valve according to the running state of the transformer to prevent sudden pressure change from influencing the normal running of the transformer.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A transformer with a respiration monitoring function, comprising: the monitoring device comprises a transformer monitoring device, a breather (4) and a conservator (2), wherein the transformer monitoring device is used for acquiring running state parameters of a transformer (1), the breather (4) is connected with the transformer (1), and the conservator is used for supplying oil to the transformer;
the respirator (4) is provided with a main gas circuit (5); the main gas path (5) is provided with a drying cavity (6) and a gas control valve (7);
when the transformer is heated and expanded, redundant air in the conservator (2) is exhaled through the main air path (5);
when the oil temperature of the transformer is reduced, air is sucked in through the main air path (5), the sucked air passes through the drying cavity (6), a drying agent is arranged in the drying cavity (6), the sucked air is dried, and then the air enters the transformer;
the transformer monitoring device includes: the device comprises a processor (11), a transformer oil temperature detection module (12), a valve control circuit (13), an input and output module (14) and a storage (15);
the processor (11) is connected with the input and output module (14), outputs the information of the transformer, acquires the data information input by a user and executes the data information;
the processor (11) is connected with the transformer oil temperature detection module (12) to acquire oil temperature information of the transformer in the running state and store the oil temperature information into the storage (15); and meanwhile, when the monitored oil temperature exceeds a preset threshold value, the oil temperature is connected with the air control valve (7) through the valve control circuit (13) to control the air control valve (7) to be opened, so that the transformer is ventilated.
2. The transformer with respiration monitoring and controlling function according to claim 1,
an air flow meter (8) is also arranged on the main air path (5);
the air flow meter (8) is connected with the processor (11), and the processor (11) acquires the gas flow of the main gas path (5) and controls the opening of the gas control valve (7) through the valve control circuit (13).
3. The transformer with respiration monitoring and controlling function according to claim 1,
the transformer monitoring device further comprises: a heating wire control circuit (16), an ambient temperature detection module (18) and a humidity detection module (19);
the transformer is provided with an oil cup; an electric heating wire (17) is arranged in the oil cup;
the processor (11) is connected with the ambient temperature detection module (18) to acquire ambient temperature information and store the ambient temperature information in the storage device (15);
the processor (11) is connected with the humidity detection module (19) to acquire environmental humidity information and store the environmental humidity information into the storage device (15);
the processor (11) is connected with the electric heating wire (17) through an electric heating wire control circuit (16), when the environmental humidity exceeds a threshold value, the electric heating wire (17) is controlled to work, the electric heating wire (17) heats to remove the moisture of oil in the oil cup, and the ice crystals of the respiratory orifice are melted.
4. The transformer with respiration monitoring and controlling function according to claim 2,
the processor (11) controls the opening of the air control valve (7) through the following formula;
K＝(s1-s2)/s1*100％＝(M1–M2)/(M1-M0)*100％
s1 and M1 are the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature at the current time point;
s2 and M2 represent the temperature rise of the transformer oil temperature and the temperature of the transformer oil temperature in a normal state;
m0 is ambient temperature;
k is the opening degree of the air control valve (7).
5. The transformer with respiration monitoring and controlling function according to claim 1,
the processor (11) is also used for acquiring a preset oil temperature-oil level curve of the transformer;
after the transformer operates, acquiring time T, voltage V, current I, oil level and pressure data to form a mutual correlation curve;
and manufacturing a transformer health database;
comparing the running process data of the transformer with corresponding preset threshold values respectively;
and alarming and uploading to the monitoring center after the abnormity occurs.
6. The transformer with respiration monitoring and controlling function according to claim 1,
the transformer monitoring device further comprises: a fuel level sensor (20);
the oil level sensor (20) is arranged on the transformer, and the processor (11) is connected with the oil level sensor (20) to acquire the oil quantity state information of the transformer and store the information into the storage device (15).
7. The transformer with respiration monitoring and controlling function according to claim 6,
the oil level sensor (20) is provided with an oil level scale, and the oil level scale is arranged on an observation window of the transformer body;
the oil level scale is provided with scale marks, the scale marks are provided with reading units, when the oil level moves on the scale, two groups of pulses are generated, and each pulse represents one scale mark, so that the oil level value is obtained.
8. The transformer with respiration monitoring and controlling function according to claim 6,
the oil level sensor (20) adopts a liquid level meter in a floating ball mode, a sliding resistance unit is additionally arranged in the floating ball mode liquid level meter, and an oil level value is obtained according to the change of a resistance value.
9. The transformer with respiration monitoring and controlling function according to claim 1,
the transformer monitoring device further comprises: the transformer primary and secondary side voltage detection module and the transformer primary and secondary side current detection module are connected with the transformer primary and secondary side voltage detection module;
the transformer primary and secondary side voltage detection module and the transformer primary and secondary side current detection module are respectively connected with the processor (11).
10. The transformer with respiration monitoring and controlling function according to claim 1,
the transformer monitoring device further comprises: a wireless communication module;
the processor (11) is connected with the monitoring center through the wireless communication module, uploads the operation data of the transformer to the monitoring center, and simultaneously obtains a control instruction of the monitoring center.
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| CN114791300A (en) * | 2021-11-15 | 2022-07-26 | 中国石油化工股份有限公司 | Power equipment state detection equipment with visualization function |
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| CN203733575U (en) * | 2014-03-06 | 2014-07-23 | 广西电网公司河池供电局 | Main transformer respirator solar automatic drying system |
| CN104505220A (en) * | 2015-01-07 | 2015-04-08 | 国家电网公司 | Main-transformer type online regenerative breathing device with microwave heating function and control method thereof |
| CN104614018A (en) * | 2015-01-22 | 2015-05-13 | Abb技术有限公司 | On-line integrated monitoring method and system for transformer |
| CN204464001U (en) * | 2015-03-10 | 2015-07-08 | 武汉寒霜科技有限公司 | The non-maintaining intelligent moisture absorber of a kind of transformer |
| CN207009231U (en) * | 2017-05-16 | 2018-02-13 | 天晟电气股份有限公司 | A kind of transformer breather component that can voluntarily dry |
| CN110911107A (en) * | 2018-09-17 | 2020-03-24 | 怀来驰博电工装备有限公司 | Respirator system and switching method |
| CN110323039A (en) * | 2019-07-27 | 2019-10-11 | 南京蹑波物联网科技有限公司 | A kind of automatic moisture absorption apparatus of transformer with Humidity Detection |
| CN110849881A (en) * | 2019-12-13 | 2020-02-28 | 国网宁夏电力有限公司宁东供电公司 | Transformer respirator on-line monitoring system |
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| CN114791300A (en) * | 2021-11-15 | 2022-07-26 | 中国石油化工股份有限公司 | Power equipment state detection equipment with visualization function |
| CN114791300B (en) * | 2021-11-15 | 2023-09-12 | 中国石油化工股份有限公司 | Power equipment state detection equipment with visualization function |
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