An auxiliary device for measuring the temperature of a power transformer winding

Abstract

The application discloses a kind of auxiliary devices for measuring the temperature of power transformer winding, comprising: shell, the shell includes the shell body with a plurality of openings in top surface and the shell cover hinged with the shell body, power supply is provided in the shell, and the shell cover is used to cover the opening;The opening is respectively placed with DC power supply adjusting module, power output, resistance regulator and device total switch;The power output is used to output the DC power of preset DC voltage interval and the AC power of preset AC voltage interval to the connected calibration transformer winding temperature table;The DC power supply adjusting module is used to adjust and display the output voltage value and output current value of the DC power supply;The resistance regulator is used to adjust the size of resistance output AC current.The existing transformer temperature table calibration work is limited by the volume and weight of the calibration device, thereby improving the efficiency of transformer temperature table calibration.

Description

Technical Field

[0001] This application relates to the field of transformer winding temperature measurement technology, and in particular to an auxiliary device for measuring the winding temperature of a power transformer. Background Technology

[0002] Most transformer accidents are caused by overheating of the windings, which leads to insulation aging and then to winding breakdown or even burnout. Therefore, the measurement and verification of transformer winding temperature is of great significance for early warning of transformer accidents.

[0003] To calibrate a transformer winding temperature gauge, a compensation current must be applied. Currently, the mainstream compensation current supply devices on the market are quite large and weigh over 10kg. They require two people to lift and move them horizontally, and a platform needs to be arranged on-site for operation.

[0004] In summary, the efficiency of transformer temperature measurement is limited by the size and weight of the measuring device. Therefore, it is of great significance to propose a simple auxiliary device for measuring the winding temperature of power transformers. Summary of the Invention

[0005] This application provides an auxiliary device for measuring the winding temperature of a power transformer, which solves the problem that the calibration of existing transformer temperature gauges is limited by the weight of the calibration device, thereby improving the efficiency of transformer temperature gauge calibration.

[0006] This application provides an auxiliary device for measuring the winding temperature of a power transformer, comprising: a housing, the housing including a shell body with multiple openings on its top surface and a shell cover hinged to the shell body, a power supply being provided inside the housing, and the shell cover being used to cover the openings; the openings are respectively provided with a DC power supply adjustment module, a power output port, a resistance regulator and a main switch of the device;

[0007] The power output port is used to output DC power within a preset DC voltage range and AC power within a preset AC voltage range to the connected calibration transformer winding temperature gauge.

[0008] The DC power supply adjustment module is used to adjust and display the output voltage and output current values ​​of the DC power supply;

[0009] The resistor regulator is used to adjust the magnitude of the AC current output by the resistor.

[0010] Optionally, the voltage output port includes: a DC power output port and an AC power output port;

[0011] The DC power output port is used to provide DC power for the operation of the calibration transformer winding temperature gauge;

[0012] The AC power output port is used to provide compensation current for the temperature measurement of the target power transformer winding by the calibration transformer winding temperature gauge.

[0013] Optionally, the preset DC voltage range is [0, 50V]; the preset AC voltage range is [24V, 36V].

[0014] Optionally, the inner wall of the shell cover is provided with an elastic mesh pocket.

[0015] Optionally, the top surface of the housing is provided with a heat dissipation vent.

[0016] Optionally, the power source is a lithium battery.

[0017] Optionally, the top surface of the housing is provided with a device charging port at any of the openings, the device charging port being used to charge the lithium battery.

[0018] Optionally, the DC power conditioning module includes: a DC power regulator and a DC power display screen;

[0019] The DC power regulator is used to adjust the output voltage and output current values ​​of the DC power supply.

[0020] The DC power supply display screen is used to display the output voltage value of the DC power supply.

[0021] Optionally, an AC voltage and current display screen is provided on the cover at any of the openings; the AC voltage and current display screen is used to display the AC current value output by the resistor regulator.

[0022] Optionally, the cover is provided with a battery capacity display screen at any of the openings.

[0023] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0024] This application provides an auxiliary device for measuring the winding temperature of a power transformer, comprising: a housing, the housing including a body with multiple openings on its top surface and a cover hinged to the body, a power supply inside the housing, and the cover covering the openings; each opening housing a DC power supply adjustment module, a power output port, a resistor regulator, and a main switch; the power output port outputting DC power within a preset DC voltage range and AC power within a preset AC voltage range to a connected transformer winding temperature gauge; the DC power supply adjustment module adjusting and displaying the output voltage and current values ​​of the DC power supply; and the resistor regulator adjusting the magnitude of the AC current output by the resistor. This solves the problem of existing transformer temperature gauge measurements being limited by the size and weight of the calibration device, thereby improving the efficiency of transformer temperature gauge calibration. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an auxiliary device for measuring the winding temperature of a power transformer provided in an embodiment of this application;

[0026] Figure 2 This is an internal electrical connection diagram of an auxiliary device for measuring the winding temperature of a power transformer provided in the embodiments of this application;

[0027] Figure 3 This is a schematic diagram of the inverter module of an auxiliary device for measuring the winding temperature of a power transformer provided in this application embodiment;

[0028] Figure 4 This is a schematic diagram of the DC power regulator of an auxiliary device for measuring the winding temperature of a power transformer provided in this application embodiment.

[0029] in:

[0030] 1 is the housing, 2 is the DC power regulator module, 3 is the DC power output port, 4 is the device charging port, 5 is the AC power output port, 6 is the AC voltage and current display screen, 7 is the resistor regulator, 8 is the battery capacity display screen, 9 is the heat dissipation port, 10 is the device main switch, a is the charging plug, b is the battery, c is the device main switch, d is the heat sink, e is the inverter module, f is the DC power regulator, g1 is the DC voltage and current display screen, g2 is the AC voltage and current display screen, h1 is the first overcurrent protector, h2 is the second overcurrent protector, j is the rheostat, k1 is the first socket, and k2 is the second socket. Detailed Implementation

[0031] This application provides an auxiliary device for measuring the winding temperature of a power transformer, which solves the problem that the existing voltage transformer temperature gauge calibration work is limited by the weight of the calibration device, thereby improving the efficiency of voltage transformer temperature gauge calibration.

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0033] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] For easier understanding, please refer to Figure 1 This application provides an embodiment of an auxiliary device for measuring the winding temperature of a power transformer, comprising: a housing 1, the housing including a shell body with multiple openings on the top surface and a shell cover hinged to the shell body, a power supply being provided inside the housing, and the shell cover being used to cover the openings; the openings are respectively provided with a DC power adjustment module 2, a power output port, a resistance regulator 2 and a device main switch 10;

[0036] The power output port is used to output DC power within a preset DC voltage range and AC power within a preset AC voltage range to the connected calibration transformer winding temperature gauge.

[0037] The DC power supply adjustment module 2 is used to adjust and display the output voltage and output current values ​​of the DC power supply;

[0038] The resistor regulator 7 is used to adjust the magnitude of the AC current output by the resistor.

[0039] In this embodiment of the invention, the auxiliary device for measuring the winding temperature of a power transformer consists of a housing 1 and a cover for protecting the housing 1. The top surface of the housing 1 is equipped with a power supply, a DC power adjustment module 2, a power output port, a resistance regulator 2, and a main switch 10. In practical application, maintenance personnel can open the cover, check the switch status of the auxiliary device, confirm that the resistance regulator 2 is at its maximum value, then remove the output cable and insert it into the power output port according to its polarity; connect the other end of the output cable to the corresponding contact of the platinum resistance thermometer; after verifying that the wiring is correct, turn on the main switch 10, and then slowly adjust the resistance regulator 7. At this time, the power supply provides current to the platinum resistance thermometer through the power output port, thereby assisting in the measurement of the power transformer winding temperature; upon completion of the measurement, first turn off the main switch 10 of the power supply device, then disconnect the output cable and close the cover.

[0040] Specifically, the voltage output port includes: DC power output port 3 and AC power output port 5;

[0041] The DC power output port 3 is used to provide DC power for the operation of the calibration transformer winding temperature gauge;

[0042] The AC power output port 5 is used to provide compensation current for the temperature measurement of the target power transformer winding by the calibration transformer winding temperature gauge.

[0043] Furthermore, the preset DC voltage range is [0, 50V]; the preset AC voltage range is [24V, 36V].

[0044] To facilitate the storage of the circuitry during the testing process, an elastic mesh pocket is provided on the inner wall of the casing.

[0045] To improve heat dissipation performance, the top surface of the housing is provided with a heat dissipation vent 9.

[0046] In one alternative embodiment, the power source is a lithium battery.

[0047] To facilitate the use of the device, a charging port 4 is provided on the top surface of the housing at any of the openings, and the charging port 4 is used to charge the lithium battery.

[0048] To improve the accuracy of adjustment, the DC power supply adjustment module includes: a DC power supply regulator 2 and a DC power supply display screen;

[0049] The DC power regulator 2 is used to adjust the output voltage value and the output current value of the DC power supply.

[0050] The DC power supply display screen is used to display the output voltage value of the DC power supply.

[0051] In an optional embodiment, an AC voltage and current display screen is provided on the cover at any of the openings; the AC voltage and current display screen 6 is used to display the AC current value output by the resistor regulator.

[0052] In order to know the battery capacity information in real time, the cover is provided with a battery capacity display screen 8 at any of the openings.

[0053] Please see Figure 2 , Figure 2 This is an internal electrical connection diagram of an auxiliary device for measuring the winding temperature of a power transformer provided in this application embodiment. In this embodiment, the internal components include a charging plug a, a battery b, a main switch c, a heat sink d, an inverter module e, an AC voltage and current display screen g2, a DC power regulator (with built-in display screen) g1, overcurrent protectors h1 and h2, and two sets of sockets k1 and k2. The connection port of the charging plug a is located at... Figure 1 The device's charging port has a battery b with a capacity of [missing information]. Figure 1 The power capacity display screen 8 shows that the main switch c of the device is in [position]. Figure 1 The main switch 10 of the component device is directly controlled, while the DC voltage and current display screen g1 and the AC voltage and current display screen g2 are respectively connected to and display the voltage and current on the main switch 10. Figure 1 The DC power regulator 2 and the AC voltage and current display screen are included, while the first socket k1 and the second socket k2 are connected to the DC power output module 3 and the AC voltage output port 5, respectively.

[0054] Furthermore, to achieve its inverter output function, in the specific implementation, after the top switch is turned on, the inverter converts the DC power of battery b into pure sinusoidal AC power, which is output through the "AC Output (AC OUTPUT)" on the top. Further, the automatic voltage regulation function means that when the voltage of battery b fluctuates between the undervoltage and overvoltage points, and the load varies within the rated power range, the device can automatically regulate the output voltage. The overvoltage protection function means that when the voltage of battery b is greater than the "overvoltage point," battery b cuts off power to the inverter module e. The undervoltage protection function means that when the voltage of battery b is lower than the "undervoltage point," to avoid over-discharge and damage to battery b, battery b cuts off power to the inverter module e. The inverter resumes operation when the voltage rises to the "undervoltage recovery point." In this embodiment of the invention, the inverter module e uses an SPWM pulse signal, which is a pulse sequence with equal amplitude and period but unequal width. When the amplitude of the modulation wave is changed, the pulse width of the SPWM pulse signal will change accordingly, thereby changing the magnitude of the output voltage; when the frequency of the modulation wave is changed, the fundamental frequency of the output signal will also change accordingly, thus achieving the purpose of both voltage regulation and frequency regulation.

[0055] Please see Figure 3 , Figure 3This is a schematic diagram of the inverter module of an auxiliary device for measuring the winding temperature of a power transformer provided in this application embodiment. In the schematic diagram, the battery terminal is input through con12, and the power is supplied to integrated circuit IC1 through resistor R50, resistor R47, and capacitor C25. The voltage is filtered through resistor R51, processing unit U2, capacitors C27, C28, C30, and C31 to become 15V. This 15V voltage supplies power to relay RLY2, integrated circuit IC3, and integrated circuit IC6. The voltage also passes through resistor R50, resistor R47, and capacitor C26 to provide integrated circuit IC1 as a reference voltage input. The voltage also serves as the drain voltage of MOSFETs T5, T6, T7, and T8. Subsequently, the 15V voltage is filtered through resistor R52, unit U8, capacitors C29, C33, and C33 to become 5V. This 5V voltage supplies power to integrated circuits IC1, IC3, and IC6. The signal is output via PWM modulation from pin 13 of integrated circuit IC1, with pins 12 and 14 serving as feedback inputs. The signal from pin 13 of IC1 is processed by processing unit U6A, resistor R53, processing unit U7A, and capacitor C39, and then sent to integrated circuit IC3. The signal is then sent to pin 12 of IC3 via resistor R54, capacitor C40, and processing unit U7B as a low-level logic input. The signal from pin 13 of the microcontroller PIC16F73 is processed by processing unit U6B, resistor R55, processing unit U7C, and capacitor C37, and then sent to integrated circuit IC6. The signal is then sent to pin 12 of IC6 via resistor R60, capacitor C38, and processing unit U7D as a low-level logic input. The high and low voltage outputs from pins 7 and 1 of IC3 are connected to a base-collector coupled multivibrator (SCVM) via resistor R56, diode D11, resistors R21 and R24, MOSFET T5, resistor R57, diode D12, resistors R42 and R43, and SCVM T8 to form a square wave output. Similarly, the high and low voltage outputs from pins 7 and 1 of IC6 are connected to a base-collector coupled multivibrator (SCVM) via resistor R58, diode D13, resistors R38 and R39, MOSFET T6, resistor R59, diode D14, resistors R40 and R41, and SCVM T7 to form a square wave output. This output is then boosted and filtered by transformer TX5, capacitor C16, relay RLY2, and con1. The output terminal consists of a signal feedback loop composed of transformer TX2, transistor Q1, resistor R46, resistor R49, and capacitor C19. When the protection is triggered, the output is disconnected through resistor R18, transistor Q6, relay RLY2, and diode D2.The voltage output feedback is provided by transformer TX6, amplifier Q5, resistors R44, R45, and R48, and capacitor C20. When undervoltage or overvoltage occurs, the signal outputs at pins 12, 13, and 14 of integrated circuit IC1 are controlled to stabilize the voltage. Capacitors C17 and C18 perform power supply filtering.

[0056] Please see Figure 4 , Figure 4 This is a schematic diagram of the DC power supply regulator of an auxiliary device for measuring the winding temperature of a power transformer provided in this application embodiment. For the Zener diode voltage regulator circuit, its working principle utilizes the characteristic that a slight change in the voltage across the Zener diode will cause a large change in its current. The output voltage is stabilized by adjusting the voltage drop across the current-limiting resistor connected in series with the Zener diode. The LM317 adjustable three-terminal voltage regulator can continuously output an adjustable DC voltage. However, it can only continuously adjust a positive voltage, and the regulator contains overcurrent and overheat protection circuits. The voltage output regulation circuit consists of a resistor (R1) and a variable potentiometer (R2).

[0057] The present invention provides an auxiliary device for measuring the winding temperature of a power transformer, comprising: a housing 1, the housing including a body with multiple openings on its top surface and a cover hinged to the body; a power supply is provided inside the housing, and the cover is used to cover the openings; the openings respectively house a DC power supply adjustment module 2, a power output port, a resistor regulator 7, and a main switch 10; the power output port is used to output DC power within a preset DC voltage range and AC power within a preset AC voltage range to the connected transformer winding temperature gauge; the DC power supply adjustment module 2 is used to adjust and display the output voltage and current values ​​of the DC power supply; the resistor regulator 7 is used to adjust the magnitude of the AC current output by the resistor. This invention solves the problem that existing transformer temperature gauge calibration work is limited by the size and weight of the calibration device, thereby improving the efficiency of transformer temperature gauge calibration.

[0058] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An auxiliary device for measuring temperature of a winding of a power transformer, characterized in that, The utility model relates to a kind of temperature measuring device for transformer winding, including: Shell, the shell includes the shell body with multiple openings on top surface and the shell cover articulated with the shell body, power supply is equipped in the shell, and the shell cover is used to cover the opening;The opening is respectively placed direct-current power supply adjusting module, power output, resistance regulator and device total switch; The power output is used to output preset direct-current voltage interval direct-current power and preset alternating voltage interval alternating current to the connected check transformer winding temperature table; The direct-current power supply adjusting module is used to adjust and display the output voltage value and output current value of the direct-current power supply; The resistance regulator is used to adjust the size of resistance output alternating current; Further including: Charging plug, battery, device total switch, radiator, inverter module, direct-current voltage and current display screen, alternating voltage and current display screen, direct-current power supply regulator, first overcurrent protector, second overcurrent protector, socket, rheostat, first socket and second socket; The charging plug is connected with the battery and the device total switch respectively; The inverter module is connected with the battery, the device total switch, the radiator, the direct-current power supply regulator respectively; The direct-current voltage and current display screen is connected with the direct-current power supply regulator; The inverter module is connected with the alternating voltage and current display screen, the first overcurrent protector and the rheostat respectively;The first overcurrent protector and the rheostat are connected with the first socket respectively; The direct-current power supply regulator is connected with the second overcurrent protector and the second socket in sequence; The inverter module includes resistance R50; One end of the resistance R50 is connected with battery end, and the other end of the resistance R50 is connected with resistance R47 in series;Capacitor C25 is connected in parallel at both ends of the resistance R47, and the capacitor C25 is connected with integrated circuit IC1; The integrated circuit IC1 is connected with one end of capacitor C20, one end of capacitor C19, input end of processing unit U6A, one input end of processing unit U7B, input end of processing unit U6B, one input end of processing unit U7D, integrated circuit IC3, integrated circuit IC6 and resistance R18 respectively;The integrated circuit IC1, the integrated circuit IC3 and the integrated circuit IC6 are grounded; One end of the capacitor C20 is connected with one end of resistance R48 and one end of resistance R45 respectively;The other end of the capacitor C20 and the other end of the resistance R48 are grounded;The other end of the resistance R45 is connected with one end of resistance R44, and the other end of the resistance R44 is connected with ground and first end of amplifier Q5 respectively;Second end and third end of the amplifier Q5 are connected with one side of transformer TX6;Fourth end of the amplifier Q5 is grounded;The other side of the transformer TX6 is used as voltage output feedback end and is connected to filter output end. One end of the capacitor C19 is connected with one end of the resistor R49 and one end of the resistor R46 respectively; the other end of the resistor R49 is grounded; the other end of the resistor R46 is connected with the first end of the transistor Q1; the fourth end of the transistor Q1 is grounded, and the second end and the third end of the transistor Q1 are connected with one side of the transformer TX2; the other side of the transformer TX2 is connected with the moving contact of the relay RLY2 and one end of the capacitor C16 respectively; the other end of the capacitor C16 is connected to the filter output end; the two ends of the capacitor C16 are connected to the other side of the transformer TX5; The static contact of the relay RLY2 is connected with the filter output end; one end of the coil of the relay RLY2 is connected with the cathode of the diode D2 and one end of the capacitor C31 respectively; the other end of the coil of the relay RLY2 is connected with the anode of the diode D2 and the collector of the transistor Q6 respectively; the emitter of the transistor Q6 is grounded; the base of the transistor Q6 is connected with the resistor R18; One end of the output end of the processing unit U6A is connected with one end of the resistor R53 and one input end of the processing unit U7A respectively; the other end of the resistor R53 is connected with the other input end of the processing unit U7A and one end of the capacitor C39 respectively, the other end of the capacitor C39 is grounded, and the output end of the processing unit U7A is connected with the integrated circuit IC3; One input end of the processing unit U7B is connected with one end of the resistor R54, and the other end of the resistor R54 is connected with the other input end of the processing unit U7B and one end of the capacitor C40 respectively, and the other end of the capacitor C40 is grounded; The output end of the processing unit U6B is connected with one input end of the processing unit U7C and one end of the resistor R55 respectively; the other end of the resistor R55 is connected with the other input end of the processing unit U7C and one end of the capacitor C37 respectively; the other end of the capacitor C37 is grounded; the output end of the processing unit U7C is connected with the integrated circuit IC6; One input end of the processing unit U7D is connected with one end of the resistor R60, and the other end of the resistor R60 is connected with one end of the capacitor C38 and the other input end of the processing unit U7D respectively, and the other end of the capacitor C38 is grounded; the output end of the processing unit U7D is connected with the integrated circuit IC6; The integrated circuit IC3 is further connected with the cathode of the diode D11, the cathode of the diode D9 and the cathode of the diode D12 respectively; The two ends of the diode D11 are connected with the resistor R56 in parallel, and are connected with one end of the resistor R24 and one end of the resistor R21 respectively; The other end of the resistor R24 is connected with the integrated circuit IC3, the source of the field effect transistor T5, the drain of the field effect transistor T8 and one side of the transformer TX5 respectively; The other end of the resistor R21 is connected with the gate of the field effect transistor T5; the drain of the field effect transistor T5 is connected with one end of the capacitor C17, one end of the capacitor C18 and the drain of the field effect transistor T6 respectively; the capacitor C17 is connected with the capacitor C18 in parallel and grounded; An anode of the diode D9 is connected with an anode of the diode D10, and a cathode of the diode D10 is connected with the integrated circuit IC6. A gate of the field effect transistor T7 is connected with one end of the resistor R40, and a source of the field effect transistor T7 is connected with one end of the resistor R41 and the ground. A gate of the field effect transistor T8 is connected with one end of the resistor R42, and a source of the field effect transistor T8 is connected with the ground and one end of the resistor R43. The other end of the resistor R58 is connected with a cathode of the diode D13 and the integrated circuit IC6. An anode of the diode D9 is connected with an anode of the diode D10, and a cathode of the diode D10 is connected with the integrated circuit IC6. A cathode of the diode D14 is connected with the other end of the resistor R59 and the integrated circuit IC6. One end of the capacitor C31 is connected with one end of the capacitor C30, one end of the capacitor C28, one end of the capacitor C27 and a first end of the processing unit U2, and the other end of the capacitor C31 is connected with the other end of the capacitor C30, the other end of the capacitor C28, the other end of the capacitor C27, a second end of the processing unit U2 and the ground. The resistor R51 is used for receiving the voltage of the battery end, and the processing unit U2, the capacitor C27, the capacitor C28, the capacitor C30 and the capacitor C31 are used for converting the voltage of the battery end into a 15V voltage, using the 15V voltage to power the relay RLY2, the integrated circuit IC3 and the integrated circuit IC6, and transmitting the 15V voltage to the resistor R52. The resistor R51 is used for receiving the voltage of the battery end, and the processing unit U2, the capacitor C27, the capacitor C28, the capacitor C30 and the capacitor C31 are used for converting the voltage of the battery end into a 15V voltage, using the 15V voltage to power the relay RLY2, the integrated circuit IC3 and the integrated circuit IC6, and transmitting the 15V voltage to the resistor R52. The battery end is also used for transmitting voltage to the resistor R50, and transmitting voltage to the integrated circuit IC1 through the resistor R47 and the capacitor C26, so as to serve as the reference voltage of the integrated circuit IC1; the battery end is also used for outputting voltage as the drain voltage of the field effect tube T5, the field effect tube T6, the field effect tube T7 and the field effect tube T8; The resistor R52 is used for transmitting the 15V voltage to the processing unit U8; the processing unit U8, the capacitor C29, the capacitor C33 and the capacitor C33 are used for converting the 15V voltage into 5V voltage, and using the 5V voltage to supply power for the integrated circuit IC1, the integrated circuit IC3 and the integrated circuit IC6; The integrated circuit IC1 is used for outputting a PWM modulation signal, transmitting the PWM modulation signal to the integrated circuit IC3 through the processing unit U6A, the resistor R53, the processing unit U7A and the capacitor C39, transmitting the PWM modulation signal to the integrated circuit IC3 through the resistor R54, the capacitor C40 and the processing unit U7B, transmitting the PWM modulation signal to the integrated circuit IC6 through the processing unit U6B, the resistor R55, the processing unit U7C and the capacitor C37, and transmitting the PWM modulation signal to the integrated circuit IC6 through the resistor R60, the capacitor C38 and the processing unit U7D; The resistor R56, the diode D11, the resistor R21, the resistor R24, the field effect tube T5, the resistor R57, the diode D12, the resistor R42, the resistor R43 and the field effect tube T8 constitute a transistor base-collector coupled multivibrator, which is used for receiving and converting the voltage output by the integrated circuit IC3 into a square wave output; The resistor R58, the diode D13, the resistor R38, the resistor R39, the field effect tube T6, the resistor R59, the diode D14, the resistor R40, the resistor R41 and the field effect tube T7 constitute another transistor base-collector coupled multivibrator, which is used for receiving and converting the voltage output by the integrated circuit IC6 into a square wave output; The transformer TX2, the triode Q1, the resistor R46, the resistor R49 and the capacitor C19 constitute a signal feedback loop; the resistor R18, the triode Q6, the relay RLY2 and the diode D2 are used for disconnecting the output of the signal feedback loop when triggering protection; The transformer TX6, the amplifier Q5, the resistor R44, the resistor R45, the resistor R48 and the capacitor C2 serve as a voltage output feedback end, which is used for controlling the integrated circuit IC1 to output corresponding signals when under-voltage or over-voltage occurs, so as to stabilize voltage; the capacitor C17 and the capacitor C18 serve as power supply filters.

2. The power transformer winding temperature measurement aid of claim 1, wherein, The power output port comprises a direct-current power output port and an alternating-current power output port. The direct-current power output port is configured to provide direct-current power for operation of the transformer winding temperature meter. The alternating-current power output port is configured to provide compensation current for temperature measurement of the target power transformer winding by the transformer winding temperature meter.

3. The power transformer winding temperature measurement aid of claim 2, wherein, The preset direct-current voltage interval is [0, 50V], and the preset alternating-current voltage interval is [24V, 36V].

4. The power transformer winding temperature measurement aid of claim 1, wherein, An inner wall of the shell cover is provided with an elastic mesh bag.

5. The power transformer winding temperature measurement aid of claim 1, wherein, A top surface of the shell is provided with a heat dissipation opening.

6. The power transformer winding temperature measurement aid of claim 1, wherein, The power supply is a lithium battery.

7. The power transformer winding temperature measurement aid of claim 6, wherein, A device charging port is arranged on the top surface of the shell at any of the openings, and the device charging port is configured to charge the lithium battery.

8. The power transformer winding temperature measurement aid of claim 1, wherein, The direct-current power supply adjustment module comprises a direct-current power supply regulator and a direct-current power supply display screen. The direct-current power supply regulator is configured to adjust the output voltage value and the output current value of the direct-current power supply. The direct-current power supply display screen is configured to display the output voltage value of the direct-current power supply.

9. The power transformer winding temperature measurement aid of claim 1, wherein, An alternating-current voltage and current display screen is arranged on the shell cover at any of the openings, and the alternating-current voltage and current display screen is configured to display the alternating-current current value output by the resistance regulator.

10. The power transformer winding temperature measurement aid of claim 1, wherein, A battery capacity display screen is arranged on the shell cover at any of the openings.

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