CN113567892A - Intelligent terminal device of power transformer - Google Patents
Intelligent terminal device of power transformer Download PDFInfo
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- CN113567892A CN113567892A CN202110993845.5A CN202110993845A CN113567892A CN 113567892 A CN113567892 A CN 113567892A CN 202110993845 A CN202110993845 A CN 202110993845A CN 113567892 A CN113567892 A CN 113567892A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention provides an intelligent terminal device of a power transformer, which comprises: a current sensor; a temperature sensor; a switching value sensor; the intelligent communication system comprises a current, temperature and switching value integrated intelligent communication module and a first controller; the intelligent communication module integrating current, temperature and switching value comprises a logic array unit functional module; the first controller includes an analog-to-digital converter. The invention adopts the logic array unit with multiple input and output ports, which can simultaneously meet the collection of 120 paths of signals, ensure that the signals of the intelligent electronic equipment of the transformer can be effectively read in time and calculated and analyzed, and ensure the accurate evaluation of the state of the transformer; the signal acquisition capability is strong, peripheral equipment of the transformer can be reduced to the greatest extent, the reliability and the maintainability are enhanced, and the maintenance cost is reduced; the real-time monitoring effect of the intelligent monitoring platform on the working state of the transformer is improved, the safety factor of the transformer is improved, and timely, safe and reliable data are provided for maintenance personnel.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to an intelligent terminal device of a power transformer.
Background
According to the construction scheme of the Internet of things of the power transmission and transformation equipment provided by the national power grid in 2019, a sensor network standard architecture with access nodes and sink nodes as cores needs to be established in the sensor network architecture design. The transformer market capacity is necessary to be effectively utilized, and the intelligent terminal device which can be suitable for main network side transformer equipment is developed and researched by matching the response condition of a power supply company to a national power grid intelligent monitoring terminal, and is used for being directly installed on a transformer device body or in a machine room in the later period, so that the safety level of the transformer is improved, and the requirement of the national power grid on planning the main network side transformer intelligent terminal in the later period is met.
Disclosure of Invention
In view of the above, the present invention provides an intelligent terminal device for a power transformer, which integrates monitoring of temperature, current and switch in the transformer, and reads and comprehensively analyzes signals of an intelligent component of a conventional transformer, so as to perform health assessment on an operation state of the transformer.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an intelligent terminal device for a power transformer, including:
a current sensor; a temperature sensor; a switching value sensor; the intelligent communication module integrates current, temperature and switching value; a first controller; the intelligent communication module integrating current, temperature and switching value comprises a logic array unit functional module; the first controller comprises an analog-to-digital converter;
the analog-to-digital converter is respectively electrically connected with the current sensor, the temperature sensor and the logic array unit function module, and is used for respectively performing analog-to-digital conversion on signals sent by the current sensor and the temperature sensor and inputting the signals after the analog-to-digital conversion to the logic array unit function module; the switching value sensor is electrically connected with the logic array unit functional module and is used for inputting a signal output by the switching value sensor to the logic array unit functional module;
the logic array unit function module is used for processing the signals input by the analog-to-digital converter after analog-to-digital conversion and the signals input by the switching value sensor to obtain processed data, storing the processed data and/or uploading the processed data to a monitoring platform.
Further, the current sensor is a current sensor which converts a current signal into a voltage signal; the temperature sensor is used for converting a temperature signal into a voltage signal; the switching value sensor is used for converting a switching value dry node signal into a voltage signal.
Further, the current sensor adopts a silicon piezoresistive chip to convert a current signal into a voltage signal; the temperature sensor outputs a resistance signal by adopting a platinum resistor, and converts the temperature signal into a voltage signal; the switching value sensor adopts a photoelectric coupling device to convert a voltage signal into an optical signal and then into a voltage signal;
furthermore, the measuring range of the current sensor is 4 mA-20 mA; the measuring range of the temperature sensor is-40 ℃ to 180 ℃.
Further, the first controller further comprises a first voltage stabilizing device, a second voltage stabilizing device and an isolator; the first voltage stabilizing device is positioned between the current sensor and the analog-to-digital converter and is used for converting a voltage signal input by the current sensor into a standard voltage signal of 0-2.5V and outputting the converted signal to the analog-to-digital converter;
the second voltage stabilizing device is positioned between the temperature sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the temperature sensor into a range of 0-2.5V, comparing the voltage signal with a standard voltage signal of 2.5V, and outputting the converted signal to the analog-to-digital converter;
the isolator is located between the switching value sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the switching value sensor into a standard voltage signal of 0V or 3.3V and outputting the converted signal to the analog-to-digital converter.
Further, the transformer intelligent terminal device further comprises: and the second controller is electrically connected with the logic array unit functional module and is used for transmitting the data stored in the logic array unit functional module to the monitoring platform.
Further, the second controller comprises an RS485 interface, and data stored in the logic array unit function module is converted through the RS485 interface and then transmitted to the monitoring platform.
Furthermore, the logic array unit functional module is provided with a plurality of input/output ports, and is used for simultaneously acquiring a plurality of signals transmitted by the switching value sensor and a plurality of signals of the current sensor and the temperature sensor after the signals are converted by the analog-to-digital converter.
Furthermore, the intelligent terminal device of the power transformer further comprises a differential current acquisition circuit, the differential current acquisition circuit is arranged to be connected with the current sensor, the differential current acquisition circuit adopts double differential lines, simultaneously acquires two paths of signals, and inputs the acquired signals to the current sensor.
In a second aspect, the invention provides a power transformer, where the power transformer includes the power transformer intelligent terminal device as described above.
The technical scheme of the invention has the following beneficial effects:
the invention provides an intelligent terminal device of a power transformer, which comprises: a current sensor; a temperature sensor; a switching value sensor; the intelligent communication module integrates current, temperature and switching value; a first controller; the intelligent communication module integrating current, temperature and switching value comprises a logic array unit functional module; the first controller comprises an analog-to-digital converter; the analog-to-digital converter is respectively electrically connected with the current sensor, the temperature sensor and the logic array unit function module, and is used for respectively performing analog-to-digital conversion on signals sent by the current sensor and the temperature sensor and inputting the signals after the analog-to-digital conversion to the logic array unit function module; the switching value sensor is electrically connected with the logic array unit functional module and is used for inputting a signal output by the switching value sensor to the logic array unit functional module; the logic array unit function module is used for processing the signals input by the analog-to-digital converter after analog-to-digital conversion and the signals input by the switching value sensor to obtain processed data, storing the processed data and/or uploading the processed data to a monitoring platform. The intelligent terminal device of the power transformer provided by the invention at least has the following advantages:
(1) by adopting a double differential circuit, the isolation of each path of signals is realized respectively, the signals do not interfere with each other, current signals can be processed independently, multiple paths of signals can be processed together, and the reliability of data reading is ensured;
(2) the logic array unit with multiple input and output ports is adopted, so that the collection of 120 paths of signals can be simultaneously met, the signals of intelligent electronic equipment of the transformer can be effectively read in time and calculated and analyzed, and the accurate evaluation of the state of the transformer can be ensured;
(3) the signal acquisition capability is strong, peripheral equipment of the transformer can be reduced to the greatest extent, the reliability and the maintainability are enhanced, and the maintenance cost is reduced; the real-time monitoring effect of the intelligent monitoring platform on the working state of the transformer is improved, the safety coefficient of the working of the transformer is improved, and timely, safe and reliable data are provided for maintenance personnel;
(4) and the intelligent terminal device of the power transformer optimizes the signals and transmits the signals to the monitoring platform. The monitoring platform can be 24 hours incessant monitoring intelligent terminal gathers real-time data, and each monitoring point monitoring data of dynamic display forms the report data, and staff's accessible APP visits monitoring platform, looks over corresponding data in real time.
Drawings
FIG. 1 is a flow chart of a transformer intelligent terminal device;
FIG. 2 is an internal block diagram of a switching value dry node signal acquisition circuit;
FIG. 3 is an internal block diagram of a current acquisition circuit;
FIG. 4 is a current differential line acquisition circuit;
FIG. 5 is an internal block diagram of a temperature acquisition circuit;
FIG. 6 is a schematic diagram of RS-485 communication.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
In a first aspect, the present invention provides an intelligent terminal device for a power transformer, including:
a current sensor; a temperature sensor; a switching value sensor; the intelligent communication module integrates current, temperature and switching value; a first controller; the intelligent communication module integrating current, temperature and switching value comprises a logic array unit functional module; the first controller comprises an analog-to-digital converter;
the analog-to-digital converter is respectively electrically connected with the current sensor, the temperature sensor and the logic array unit function module, and is used for respectively performing analog-to-digital conversion on signals sent by the current sensor and the temperature sensor and inputting the signals after the analog-to-digital conversion to the logic array unit function module; the switching value sensor is electrically connected with the logic array unit functional module and is used for inputting a signal output by the switching value sensor to the logic array unit functional module;
the logic array unit function module is used for processing the signals input by the analog-to-digital converter after analog-to-digital conversion and the signals input by the switching value sensor to obtain processed data, storing the processed data and/or uploading the processed data to a monitoring platform.
The intelligent terminal device of the power transformer provided by the invention can effectively collect, calculate and analyze the working states of intelligent components such as a temperature controller, a Pt100 sensor, a voltage regulating switch control box, a pressure sensor, a body oil level meter, a switch oil level meter, a vibration sensor, a noise sensor, a cooling control cabinet, an oil level temperature controller, a winding temperature controller, a quick-acting pressure relay, a pressure release device, an oil chromatography device, a winding optical fiber temperature measuring device, a partial discharge device, a sleeve monitoring device, a merging unit, a grounding current sensor, a moisture absorber and the like in time, thereby realizing the real-time monitoring of the working state of the power transformer and ensuring the healthy working state of the transformer.
Specifically, the intelligent terminal device of the power transformer comprises a plurality of current sensors, a plurality of temperature sensors and a plurality of switching value sensors, wherein the current sensors, the temperature sensors and the switching value sensors are respectively and electrically connected with the intelligent assemblies and are used for acquiring the working states of the intelligent assemblies. The intelligent terminal device of the power transformer also comprises a current, temperature and switching value integrated intelligent communication module and a first controller; the current, temperature and switching value integrated intelligent communication module comprises a logic array unit function module, the first controller comprises a plurality of analog-to-digital converters, and the analog-to-digital converters are respectively in one-to-one correspondence with the current sensors and the temperature sensors. In the working process of the intelligent terminal device, the intelligent components respectively transmit signals to the current sensor, the temperature sensor and the switching value sensor and convert the signals in the sensors. The current sensor and the temperature sensor are both electrically connected with the analog-to-digital converter, the signal output by the current sensor is transmitted to the analog-to-digital converter, and the analog-to-digital converter performs analog-to-digital conversion on the signal sent by the current sensor. The analog-to-digital converter is also connected with the logic array unit function module and is used for processing the analog-to-digital converted signals input by the analog-to-digital converter and the signals input by the switching value sensor to obtain processed data, and storing the processed data and/or uploading the processed data to a monitoring platform. The switching value sensor is not connected with the analog-to-digital converter, signals are processed by the switching value sensor and then transmitted to the logic array unit functional module for processing, and processed data are also stored and/or uploaded to the monitoring platform. The intelligent terminal device of the transformer provided by the invention has strong signal acquisition capability, can reduce peripheral equipment of the transformer to the greatest extent, enhances the reliability and maintainability and reduces the maintenance cost; meanwhile, the real-time monitoring effect of the intelligent monitoring platform on the working state of the transformer is improved, the safety factor of the working of the transformer is improved, and timely, safe and reliable data are provided for maintenance personnel.
According to some embodiments of the invention, the current sensor is a current sensor that converts a current signal to a voltage signal; the temperature sensor is used for converting a temperature signal into a voltage signal; the switching value sensor is a switching value sensor which converts a signal into a voltage signal.
According to some embodiments of the invention, the current sensor employs a silicon piezoresistive chip to convert a current signal to a voltage signal; the temperature sensor outputs a resistance signal by adopting a platinum resistor, and converts the temperature signal into a voltage signal; the switching value sensor adopts a photoelectric coupling device to convert a voltage signal into an optical signal and then into a voltage signal.
According to some embodiments of the invention, the current sensor has a range of 4 mA-20 mA; the measuring range of the temperature sensor is-40 ℃ to 180 ℃.
According to some embodiments of the invention, the first controller further comprises a first voltage regulation device, a second voltage regulation device and an isolator; the first voltage stabilizing device is positioned between the current sensor and the analog-to-digital converter and is used for converting a voltage signal input by the current sensor into a standard voltage signal of 0-2.5V and outputting the converted signal to the analog-to-digital converter; the second voltage stabilizing device is positioned between the temperature sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the temperature sensor into a range of 0-2.5V, comparing the voltage signal with a standard voltage signal of 2.5V, and outputting the converted signal to the analog-to-digital converter; the isolator is located between the switching value sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the switching value sensor into a standard voltage signal of 0V or 3.3V and outputting the converted signal to the analog-to-digital converter.
In the invention, the first controller further comprises a first voltage stabilizing device, a second voltage stabilizing device and an isolator, and the first voltage stabilizing device, the second voltage stabilizing device and the isolator mainly play roles in protection and isolation. Specifically, the signal processed by the current sensor is transmitted to the first voltage stabilizer, and then is transmitted to the mode converter after being stabilized by the first voltage stabilizer. The signals processed by the temperature and current sensor are the same as the signals processed by the temperature and current sensor, and are transmitted to the second voltage stabilizing device firstly, and then transmitted to the mode converter after being stabilized by the second voltage stabilizing device. The switching value sensor is different from the former two, the switching value sensor is electrically connected with the isolator, and the voltage signal transmitted by the switching value sensor is converted into the optical signal through the isolator and is converted into the voltage signal again. The isolator can reduce electromagnetic interference, strong current interference and the like of a cable in the transformer, thereby being beneficial to protecting internal precision equipment.
According to some embodiments of the invention, the transformer intelligent terminal device further comprises: and the second controller is electrically connected with the logic array unit functional module and is used for transmitting the data stored in the logic array unit functional module to the monitoring platform. In the invention, the transformer intelligent terminal device further comprises a second controller, wherein the second controller can be a main control board, and the second controller is electrically connected with the logic array unit function module, so that data stored in the logic array unit function module can be transmitted to a monitoring platform. The monitoring platform can be a remote computer, a mobile phone and the like. The flow chart of the transformer intelligent terminal device is shown in fig. 1.
According to some embodiments of the invention, the second controller includes an RS485 interface, and the data stored in the logic array unit function module is converted by the RS485 interface and then transmitted to the monitoring platform. Specifically, the data are transmitted to the monitoring platform through the RS485 interface, and the RS485 interface can support an MQTT protocol and a modbus protocol and is transmitted to the monitoring platform through a network. FIG. 6 is a schematic diagram of RS-485 communication.
In the invention, reliable and valuable signals are transmitted to the monitoring platform through data optimization processing. The monitoring platform can be 24 hours incessant monitoring intelligent terminal gathers real-time data, and each monitoring point monitoring data of dynamic display forms the report data, and staff's accessible APP visits monitoring platform, looks over corresponding data in real time.
According to some embodiments of the present invention, the logic array unit functional module has multiple input/output ports, and is configured to simultaneously acquire multiple signals transmitted by the switching value sensor, and multiple signals of the current sensor and the temperature sensor after being subjected to signal conversion by the analog-to-digital converter.
The invention utilizes the logic array unit functional module with a plurality of input and output ports, thereby being capable of simultaneously monitoring a plurality of current signals, temperature models and switching value signals. As shown in fig. 2, the switching value sensor is electrically connected to the multiple input/output ports of the logic array unit functional module through an isolator, and can simultaneously acquire switching value signals of 50 ports, thereby realizing rapid and timely acquisition. As shown in fig. 3, the multi-path current signals are timely and accurately transmitted to the logic array unit function module by a high-speed, full-duplex and synchronous communication bus, so as to realize the collection of the current values. As shown in fig. 5, the temperature sensor circuit realizes reading of 10-channel platinum resistor sampling data, and performs validity selection on the platinum resistor by using a chip selection signal and reads a resistance value corresponding to the temperature, and then obtains the corresponding temperature through table lookup calculation. The invention adopts the logic array unit function unit with multiple input and output ports, can simultaneously meet the collection of 120 paths of signals, and ensures that the signals of the intelligent electronic equipment of the transformer can be timely and effectively read and calculated and analyzed so as to ensure the accurate evaluation of the state of the transformer.
According to some embodiments of the invention, the intelligent terminal device of the power transformer further comprises a differential current acquisition circuit, the differential current acquisition circuit is connected with the current sensor, the differential current acquisition circuit adopts a double differential line, simultaneously acquires two paths of signals, and inputs the acquired signals to the current sensor. As shown in fig. 4, the differential current acquisition circuit uses 5 groups of double differential circuits with 14-bit sampling precision to respectively realize signal isolation of each path without mutual interference, can independently process current signals, can also process multiple paths together, and ensures reliable read data. Meanwhile, a proper bypass capacitor device can be properly added for filtering to the ground, so that the anti-interference capability is enhanced, the effective acquisition distance is increased, and the reliable online monitoring of the intelligent electronic component of the transformer is realized.
In a second aspect, the invention provides a power transformer, where the power transformer includes the power transformer intelligent terminal device as described above.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a power transformer intelligent terminal device which characterized in that includes:
a current sensor;
a temperature sensor;
a switching value sensor;
the intelligent communication module integrates current, temperature and switching value;
a first controller;
the intelligent communication module integrating current, temperature and switching value comprises a logic array unit functional module;
the first controller comprises an analog-to-digital converter;
the analog-to-digital converter is respectively electrically connected with the current sensor, the temperature sensor and the logic array unit function module, and is used for respectively performing analog-to-digital conversion on signals sent by the current sensor and the temperature sensor and inputting the signals after the analog-to-digital conversion to the logic array unit function module; the switching value sensor is electrically connected with the logic array unit functional module and is used for inputting a signal output by the switching value sensor to the logic array unit functional module;
the logic array unit function module is used for processing the signals input by the analog-to-digital converter after analog-to-digital conversion and the signals input by the switching value sensor to obtain processed data, storing the processed data and/or uploading the processed data to a monitoring platform.
2. The intelligent terminal device for power transformers according to claim 1,
the current sensor is used for converting a current signal into a voltage signal;
the temperature sensor is used for converting a temperature signal into a voltage signal;
the switching value sensor is used for converting a switching value dry node signal into a voltage signal.
3. The power transformer intelligent terminal device according to claim 2,
the current sensor adopts a silicon piezoresistive chip to convert a current signal into a voltage signal;
the temperature sensor outputs a resistance signal by adopting a platinum resistor, and converts the temperature signal into a voltage signal;
the switching value sensor adopts a photoelectric coupling device to convert a voltage signal into an optical signal and then into a voltage signal.
4. The power transformer intelligent terminal device according to claim 2,
the measuring range of the current sensor is 4 mA-20 mA;
the measuring range of the temperature sensor is-40 ℃ to 180 ℃.
5. The intelligent terminal device of the power transformer according to claim 2, wherein the first controller further comprises a first voltage stabilizer, a second voltage stabilizer and an isolator;
the first voltage stabilizing device is positioned between the current sensor and the analog-to-digital converter and is used for converting a voltage signal input by the current sensor into a standard voltage signal of 0-2.5V and outputting the converted signal to the analog-to-digital converter;
the second voltage stabilizing device is positioned between the temperature sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the temperature sensor into a range of 0-2.5V, comparing the voltage signal with a standard voltage signal of 2.5V, and outputting the converted signal to the analog-to-digital converter;
the isolator is located between the switching value sensor and the analog-to-digital converter, and is used for converting a voltage signal input by the switching value sensor into a standard voltage signal of 0V or 3.3V and outputting the converted signal to the analog-to-digital converter.
6. The intelligent terminal device for transformers according to claim 1, further comprising:
and the second controller is electrically connected with the logic array unit functional module and is used for transmitting the data stored in the logic array unit functional module to the monitoring platform.
7. The intelligent terminal device of transformer according to claim 6, wherein the second controller comprises an RS485 interface, and the RS485 interface converts the data stored in the logic array unit function module and transmits the converted data to the monitoring platform.
8. The intelligent terminal device of the power transformer as claimed in claim 1, wherein the logic array unit functional module has multiple input/output ports for simultaneously collecting multiple signals transmitted by the switching value sensor and multiple signals of the current sensor and the temperature sensor after being subjected to the number conversion by the analog-to-digital converter.
9. The intelligent terminal device for the power transformer as claimed in claim 1, further comprising a differential current collection circuit, wherein the differential current collection circuit is connected to the current sensor, and the differential current collection circuit collects two signals simultaneously by using a double differential line and inputs the collected signals to the current sensor.
10. A power transformer, characterized in that the power transformer comprises the intelligent terminal device of the power transformer as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110993845.5A CN113567892A (en) | 2021-08-27 | 2021-08-27 | Intelligent terminal device of power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110993845.5A CN113567892A (en) | 2021-08-27 | 2021-08-27 | Intelligent terminal device of power transformer |
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| CN113567892A true CN113567892A (en) | 2021-10-29 |
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| CN202110993845.5A Pending CN113567892A (en) | 2021-08-27 | 2021-08-27 | Intelligent terminal device of power transformer |
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- 2021-08-27 CN CN202110993845.5A patent/CN113567892A/en active Pending
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