CN115219061A - Temperature monitoring method and system for on-load capacity and voltage regulating distribution transformer - Google Patents
Temperature monitoring method and system for on-load capacity and voltage regulating distribution transformer Download PDFInfo
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- CN115219061A CN115219061A CN202211112109.5A CN202211112109A CN115219061A CN 115219061 A CN115219061 A CN 115219061A CN 202211112109 A CN202211112109 A CN 202211112109A CN 115219061 A CN115219061 A CN 115219061A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 68
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- 238000001931 thermography Methods 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims description 20
- 230000036760 body temperature Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/025—Interfacing a pyrometer to an external device or network; User interface
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Abstract
The application relates to a temperature monitoring method and a system for an on-load capacity and voltage regulating distribution transformer, wherein the method comprises the following specific steps: s1, a transformer oil temperature sensor acquires the top oil temperature T1 in a transformer, and an environment temperature sensor acquires the environment temperature T2 of the transformer; s2, acquiring the temperature T3 of the transformer body by using an infrared thermal imaging temperature measuring instrument; s3, transmitting the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body to a controller, and uploading the temperature to a monitoring center through a monitoring terminal of the distribution transformer by the controller; and S4, the monitoring center analyzes and judges the temperature state of the transformer according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, so that the temperature monitoring of the on-load capacity-regulating voltage-regulating distribution transformer is realized. This application ensures temperature monitoring's accuracy through the dual perception of infrared thermal imaging and temperature sensor, ensures the safety and stability operation of transformer.
Description
Technical Field
The application relates to the field of distribution transformers, in particular to a temperature monitoring method and system for an on-load capacity and voltage regulating distribution transformer.
Background
In rural areas of China, a power grid has the characteristics of dispersed load, strong seasonality, low average load rate and the like, the peak-valley load of the power grid is greatly changed, a transformer is approximately in no-load operation in valley, and overload is relatively serious in peak; the selection of the capacity of the transformer is a difficult problem, the economic benefit is reduced due to overlarge capacity selection, the power supply reliability is reduced due to undersize capacity selection; the capacity is large, the no-load loss is large, and the power grid loss is large in long-term operation.
In order to solve the above problems, a great number of on-load capacity regulating and voltage regulating distribution transformers are used, however, due to the complex application environment of the transformers, when a fault or an emergency occurs, the transformer fault of the temperature change reaction of the transformers cannot be timely sensed, the transformer is easily damaged, power failure occurs, and economic loss is caused, so that a temperature monitoring method and a temperature monitoring system for the on-load capacity regulating and voltage regulating distribution transformers are needed to be provided.
Disclosure of Invention
The embodiment of the application aims to provide a temperature monitoring method and a temperature monitoring system for an on-load capacity and voltage regulating distribution transformer, which can monitor the temperature condition of the transformer in real time and prevent power failure caused by transformer faults.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, an embodiment of the present application provides a method for monitoring a temperature of an on-load capacitance and voltage regulating distribution transformer, including the following specific steps:
s1, a transformer oil temperature sensor acquires the top layer oil temperature T1 inside a transformer, and an environment temperature sensor acquires the environment temperature T2 of the transformer;
s2, acquiring the temperature T3 of the transformer body by using an infrared thermal imaging temperature measuring instrument;
s3, transmitting the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body to a controller, and uploading the temperature to a monitoring center through a monitoring terminal of the distribution transformer by the controller;
and S4, the monitoring center calculates a top oil temperature rise T12 and a body temperature rise T32 according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, analyzes and judges the temperature state of the transformer, and realizes temperature monitoring of the on-load capacity-regulating and voltage-regulating distribution transformer.
In the step S1, the transformer oil temperature sensor extends into the transformer, and the collected top oil temperature T1 is an average value of 8 times of collected data of the temperature sensor within 2 minutes at intervals of 15 seconds.
In the step S2, the infrared thermal imaging thermometer obtains the temperature T3 of the transformer body as the temperature of the iron core portion with the highest temperature in the infrared image of the transformer body.
In the step S4, the controller includes a microprocessor chip, a power supply circuit and a communication chip, the power supply circuit is used for supplying power to the transformer oil temperature sensor, the ambient temperature sensor and the infrared thermal imaging thermometer, the microprocessor chip receives temperature values acquired by the transformer oil temperature sensor and the ambient temperature sensor and obtains a temperature value of the transformer body through the infrared thermal imaging thermometer, the communication chip packages the temperature value received by the microprocessor chip into a temperature information message and transmits the temperature information message to the distribution transformer monitoring terminal, the distribution transformer monitoring terminal transmits the temperature information message to the monitoring center through a communication network with the monitoring center, and the monitoring center analyzes the temperature information message to obtain the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body.
In the step S4, the monitoring center calculates a top oil temperature rise T12 and a body temperature rise T32 according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, analyzes and judges the temperature state of the transformer specifically,
taking the difference between the top oil temperature T1 and the ambient temperature T2 as a top oil temperature rise T12, and directly judging that the temperature of the transformer exceeds the limit when the top oil temperature rise T12 is greater than the top oil temperature rise threshold value of the transformer;
and taking the difference between the body temperature T3 and the environment temperature T2 as the body temperature rise T32, and judging that the temperature of the transformer is out of limit when the top layer oil temperature rise T12 is smaller than the top layer oil temperature rise threshold value of the transformer and the body temperature rise T32 of the transformer exceeds the body temperature rise threshold value of the transformer.
In a second aspect, the embodiment of the application provides an on-load capacity and voltage regulation distribution transformer temperature monitoring system, including installing the transformer oil temperature sensor who is used for gathering the inside top layer oil temperature of transformer in transformer body top, transformer oil temperature sensor is connected to the controller of installing in distribution transformer monitoring terminal, the controller is connected and is used for measuring the infrared thermal imaging thermoscope of transformer body temperature and ambient temperature's ambient temperature sensor, distribution transformer monitoring terminal and surveillance center communication connection form on-load capacity and voltage regulation distribution transformer temperature monitoring system.
The controller comprises a microprocessor chip, a power supply circuit and a communication chip, wherein the power supply circuit is used for supplying power to a transformer oil temperature sensor, an ambient temperature sensor and an infrared thermal imaging thermometer, the microprocessor chip receives temperature values acquired by the transformer oil temperature sensor and the ambient temperature sensor and obtains a temperature value of a transformer body through the infrared thermal imaging thermometer, the communication chip packages the temperature value received by the microprocessor chip into a temperature information message and transmits the temperature information message to a distribution transformer monitoring terminal, the distribution transformer monitoring terminal transmits the temperature information message to a monitoring center through a communication network with the monitoring center, and the monitoring center analyzes the temperature information message to obtain a top oil temperature T1, an ambient temperature T2, a temperature T3 of the transformer body, a top oil temperature rise T12 and a body temperature rise T32.
The transformer oil temperature sensor adopts a fiber bragg grating temperature sensor which is buried in the transformer.
The infrared thermal imaging temperature measuring instrument is arranged on the side edge of the on-load capacity and voltage regulating distribution transformer, and the infrared thermal imaging temperature measuring instrument is over against the part of the transformer without the radiating fins.
And the controller and the monitoring terminal of the distribution transformer both take electricity from the inlet wire end of the transformer through an electricity taking wire clamp.
Compared with the prior art, the beneficial effects of this application are: the temperature condition of transformer can be gathered and monitored in real time, need not carry out big structural adjustment, remote communication and temperature monitoring can be realized to the current distribution transformer monitoring terminal of application, through the dual perception of infrared thermal imaging and temperature sensor, ensure temperature monitoring's accuracy, ensure the safe and stable operation of transformer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a monitoring system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a monitoring system according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of a method according to an embodiment of the present application.
Fig. 4 is a schematic diagram of temperature monitoring according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1 and 2, an on-load capacity-regulating and voltage-regulating distribution transformer temperature monitoring system comprises a transformer oil temperature sensor 2 which is installed above a transformer body 1 and used for collecting the oil temperature of the top layer inside a transformer, wherein the transformer oil temperature sensor 2 is connected to a controller 6 installed in a distribution transformer monitoring terminal 3, the controller 6 is connected with an infrared thermal imaging thermometer 4 used for measuring the temperature of the transformer body and an ambient temperature sensor 10 used for measuring the ambient temperature, and the distribution transformer monitoring terminal 4 is in communication connection with a monitoring center 5 to form the on-load capacity-regulating and voltage-regulating distribution transformer temperature monitoring system.
The controller comprises a microprocessor chip 7, a power supply circuit 8 and a communication chip 9, wherein the power supply circuit 8 is used for supplying power to the transformer oil temperature sensor 2, the ambient temperature sensor 10 and the infrared thermal imaging thermometer 4, the microprocessor chip 7 receives temperature values acquired by the transformer oil temperature sensor 2 and the ambient temperature sensor 10 and temperature values of the transformer body acquired by the infrared thermal imaging thermometer 4, the communication chip 9 packages the temperature values received by the microprocessor chip 7 into temperature information messages and transmits the temperature information messages to the distribution transformer monitoring terminal 4, the distribution transformer monitoring terminal 4 transmits the temperature information messages to the monitoring center 5 through a communication network with the monitoring center 5, and the monitoring center 5 analyzes the temperature information messages to obtain top oil temperature T1, ambient temperature T2 and temperature T3 of the transformer body. The microprocessor chip adopts a GD series MCU chip which is easy to innovate.
The transformer oil temperature sensor 2 adopts a fiber bragg grating temperature sensor which is buried in the transformer.
The infrared thermal imaging temperature measuring instrument 4 is arranged on the side edge of the on-load capacity and voltage regulating distribution transformer, and the infrared thermal imaging temperature measuring instrument is over against the part of the transformer without the cooling fins. The measurement precision of the infrared thermal imaging temperature measuring instrument is 0.1 ℃.
The controller 6 and the distribution transformer monitoring terminal 4 are powered from the transformer inlet wire end through power supply wire clamps.
Furthermore, the distribution transformer monitoring terminal and the monitoring center communicate through GPRS or HPLC, and a VB software development program is installed on a host of the monitoring center and used for analyzing the temperature.
As shown in fig. 3, an embodiment of the present application provides a method for monitoring a temperature of an on-load capacitance and voltage regulating distribution transformer, including the following specific steps:
s1, a transformer oil temperature sensor acquires the top oil temperature T1 in a transformer, and an environment temperature sensor acquires the environment temperature T2 of the transformer;
s2, acquiring the temperature T3 of the transformer body by an infrared thermal imaging temperature measuring instrument;
s3, transmitting the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body to a controller, and uploading the temperature to a monitoring center through a monitoring terminal of the distribution transformer by the controller;
and S4, the monitoring center calculates a top oil temperature rise T12 and a body temperature rise T32 according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, analyzes and judges the temperature state of the transformer, and realizes temperature monitoring of the on-load capacity-regulating and voltage-regulating distribution transformer.
In the step S1, the transformer oil temperature sensor extends into the transformer, and the collected top oil temperature T1 is an average value of 8 times of collected data of the temperature sensor within 2 minutes at intervals of 15 seconds.
In the step S2, the infrared thermal imaging thermometer obtains the value of the temperature T3 of the transformer body as the temperature of the iron core part with the highest temperature in the infrared image of the transformer body.
In the step S4, the monitoring center calculates the top oil temperature rise T12 and the body temperature rise T32 according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, analyzes and judges the temperature state of the transformer specifically,
when the top oil temperature rise T12 is larger than the top oil temperature rise threshold value of the transformer, directly judging that the temperature of the transformer exceeds the limit;
and when the top oil temperature rise T12 is smaller than the top oil temperature rise threshold value of the transformer and the temperature rise T32 of the transformer body exceeds the temperature rise threshold value of the transformer body, judging that the temperature of the transformer exceeds the limit.
The monitoring system is applied to a field of a distribution transformer in a certain rural area, in the continuous monitoring from 1 day in 5 months to 30 days in 5 months in 2022 years, the sampling time is ten am, the top layer oil temperature monitoring data, the environment temperature monitoring data and the transformer body temperature monitoring data are shown in fig. 4, and as can be seen from the figure, in 2 days in 5 months in 2022 years, the temperature rise of the top layer oil temperature exceeds a threshold value of 55K, the transformer has a fault, and in 25 days in 5 months in 2022 years, the temperature rise of the transformer body is abnormal and exceeds a threshold value of 50K. By looking up a work order of an electric power company, the fact that the oil temperature rises due to transformer overload in 5 months and 2 days in 2022 years is found, the oil temperature is recovered to be normal after capacity adjustment and pressure adjustment, the transformer overload occurs in the transformer in 5 months and 25 days in 2022 years, the numerical value of the oil temperature sensor is unchanged, and the oil temperature sensor is replaced and subjected to capacity adjustment and pressure adjustment to be recovered to be normal.
The temperature condition of transformer can be gathered and monitored in real time to this application, need not carry out big structural adjustment, uses current distribution transformer monitoring terminal to realize remote communication and temperature monitoring, through the dual perception of infrared thermal imaging and temperature sensor, ensures temperature monitoring's accuracy, ensures the safe and stable operation of transformer.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A temperature monitoring method for an on-load capacity and voltage regulating distribution transformer is characterized by comprising the following specific steps:
s1, a transformer oil temperature sensor acquires the top oil temperature T1 in a transformer, and an environment temperature sensor acquires the environment temperature T2 of the transformer;
s2, acquiring the temperature T3 of the transformer body by an infrared thermal imaging temperature measuring instrument;
s3, transmitting the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body to a controller, and uploading the temperature to a monitoring center through a monitoring terminal of the distribution transformer by the controller;
and S4, the monitoring center calculates a top oil temperature rise T12 and a body temperature rise T32 according to the top oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, analyzes and judges the temperature state of the transformer, and realizes temperature monitoring of the on-load capacity-regulating and voltage-regulating distribution transformer.
2. An on-load capacity and voltage regulating distribution transformer temperature monitoring method according to claim 1, characterized in that in step S1, the transformer oil temperature sensor is inserted into the transformer, and the collected top oil temperature T1 is an average value of 8 collected data of the temperature sensor within 2 minutes of continuous collection at 15 seconds.
3. The method for monitoring the temperature of the on-load capacity and voltage regulating distribution transformer according to claim 1, wherein in the step S2, the temperature T3 value of the transformer body obtained by the infrared thermal imaging thermometer is the temperature of the iron core part with the highest temperature in the infrared image of the transformer body.
4. An on-load capacity and voltage regulating distribution transformer temperature monitoring method according to claim 1, wherein in the step S4, the controller comprises a microprocessor chip, a power supply circuit and a communication chip, the power supply circuit is used for supplying power to the transformer oil temperature sensor, the ambient temperature sensor and the infrared thermal imaging thermometer, the microprocessor chip receives temperature values acquired by the transformer oil temperature sensor and the ambient temperature sensor and the infrared thermal imaging thermometer acquires a temperature value of the transformer body, the communication chip packages the temperature values received by the microprocessor chip into a temperature information message and transmits the temperature information message to the distribution transformer monitoring terminal, the distribution transformer monitoring terminal transmits the temperature information message to the monitoring center through a communication network with the monitoring center, and the monitoring center analyzes the temperature information message to obtain a top oil temperature T1, an ambient temperature T2 and a temperature T3 of the transformer body.
5. An on-load capacity and voltage regulating distribution transformer temperature monitoring method according to claim 4, wherein in step S4, the monitoring center calculates a top layer oil temperature rise T12 and a body temperature rise T32 according to the top layer oil temperature T1, the ambient temperature T2 and the temperature T3 of the transformer body, and the analyzing and judging of the transformer temperature state are specifically,
taking the difference between the top oil temperature T1 and the ambient temperature T2 as a top oil temperature rise T12, and directly judging that the temperature of the transformer exceeds the limit when the top oil temperature rise T12 is greater than the top oil temperature rise threshold value of the transformer;
and taking the difference between the body temperature T3 and the environment temperature T2 as the body temperature rise T32, and judging that the temperature of the transformer is out of limit when the top layer oil temperature rise T12 is smaller than the top layer oil temperature rise threshold value of the transformer and the body temperature rise T32 of the transformer exceeds the body temperature rise threshold value of the transformer.
6. The utility model provides an on-load is transferred and is held pressure regulating distribution transformer temperature monitoring system which characterized in that, is connected to the controller of installing in distribution transformer monitoring terminal including installing the transformer oil temperature sensor who is used for gathering the inside top layer oil temperature of transformer in transformer body top, transformer oil temperature sensor, the controller is connected and is used for measuring the infrared thermal imaging thermoscope of transformer body temperature and ambient temperature's ambient temperature sensor, distribution transformer monitoring terminal and surveillance center communication connection form on-load and transfer and hold pressure regulating distribution transformer temperature monitoring system.
7. An on-load capacity and voltage regulating distribution transformer temperature monitoring system according to claim 6, wherein the controller comprises a microprocessor chip, a power supply circuit and a communication chip, the power supply circuit is used for supplying power to the transformer oil temperature sensor, the ambient temperature sensor and the infrared thermal imaging thermometer, the microprocessor chip receives the temperature values collected by the transformer oil temperature sensor and the ambient temperature sensor and the infrared thermal imaging thermometer obtains the temperature value of the transformer body, the communication chip packages the temperature values received by the microprocessor chip into temperature information messages and transmits the temperature information messages to the distribution transformer monitoring terminal, the distribution transformer monitoring terminal transmits the temperature information messages to the monitoring center through a communication network with the monitoring center, and the monitoring center analyzes the temperature information messages to obtain top layer oil temperature T1, ambient temperature T2, temperature T3 of the transformer body, top layer oil temperature T12 and body temperature rise T32.
8. An on-load capacity and voltage regulating distribution transformer temperature monitoring system according to claim 6, characterized in that the transformer oil temperature sensor is a fiber grating temperature sensor buried inside the transformer.
9. An on-load capacity and voltage regulating distribution transformer temperature monitoring system according to claim 6, wherein the infrared thermal imaging temperature measuring instrument is installed at the side of the on-load capacity and voltage regulating distribution transformer, and the infrared thermal imaging temperature measuring instrument is over against the part of the transformer without the cooling fins.
10. An on-load capacitance and voltage regulating distribution transformer temperature monitoring system according to claim 6, characterized in that the controller and the distribution transformer monitoring terminal both draw electricity from the transformer inlet terminal through an electricity drawing wire clamp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211112109.5A CN115219061A (en) | 2022-09-13 | 2022-09-13 | Temperature monitoring method and system for on-load capacity and voltage regulating distribution transformer |
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| CN202211112109.5A CN115219061A (en) | 2022-09-13 | 2022-09-13 | Temperature monitoring method and system for on-load capacity and voltage regulating distribution transformer |
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