WO2023138045A1

WO2023138045A1 - Energy efficiency index detection apparatus for power transformer

Info

Publication number: WO2023138045A1
Application number: PCT/CN2022/113368
Authority: WO
Inventors: 姜杏辉; 董巍; 童彬; 俞振兴; 董明; 胡敏; 宋毅; 童文辉; 袁玉兰
Original assignee: 苏州华电电气股份有限公司
Priority date: 2022-01-21
Filing date: 2022-08-18
Publication date: 2023-07-27
Also published as: CN114527341A

Abstract

An energy efficiency index detection apparatus for a power transformer, the apparatus comprising an IPC central control unit, a PLC electrical core controller, a physical key, a direct-current resistance test unit, no-load/load test units, an output wiring switching unit, and an output wiring interface. The IPC central control unit interacts and communicates with the PLC electrical core controller. The physical key, the no-load/load test units, and the output wiring switching unit are separately connected to the PLC electrical core controller; the direct-current resistance test unit and the no-load/load test units are separately connected to the output wiring switching unit; and the output wiring interface is connected to the output wiring switching unit. The operation is simple and convenient, and the requirements for detecting the energy efficiency index of a power transformer are met.

Description

Power Transformer Energy Efficiency Level Detection Device

technical field

The invention belongs to the field of electrical test equipment, and in particular relates to a power transformer energy efficiency level detection device for power transformers.

Background technique

According to the standard requirements of "GB20052-2020 Power Transformer Energy Efficiency Limits and Energy Efficiency Grades", the test limit values of energy efficiency (no-load loss and load loss) of power transformers produced after 2020 should meet the requirements of this standard, and the two fundamental basis for energy efficiency judgment are two parameters: no-load loss value and load loss value. According to the standard requirements of "JB/T 501-2006 Power Transformer Test Guidelines", both the no-load loss test and the load loss test of the transformer need to be corrected. The no-load loss test needs to be corrected for waveform (the difference between the voltage average value and the effective value). When the load loss test is performed, temperature correction, resistance loss correction and other loss corrections are required. Therefore, when performing these two tests, the DC resistance value of the transformer winding needs to be measured before no-load and load loss tests can be performed, and corresponding corrections should be made.

At present, there is no special equipment for testing the energy efficiency level of power transformers on the market, and all of them are only separate independent project testing instruments, such as DC resistance tester, low-voltage method no-load loss tester (does not meet the requirements of the test standard, does not perform DC resistance and temperature correction), no-load loss tester (does not perform DC resistance test and temperature correction), etc. Therefore, there is no integrated single set of equipment that can complete energy efficiency level detection. When using it, it is necessary to prepare a combination of multiple devices for use, and there are the following problems:

1. Each test item requires an independent instrument, and its power supply and test wiring are independent. Each test item requires power supply and test wiring, which is prone to wiring errors, causing damage to the instrument or the transformer under test or inaccurate measurement results, and the test efficiency is extremely low;

2. Since the test instruments are scattered and independent, it is necessary to manually record the test results after each test item is completed, which is prone to recording errors and revisions, and has the subjective characteristics of manual intervention, which reduces the credibility of the results and greatly reduces the reliability of the energy efficiency evaluation results;

3. When testing no-load loss and load loss, it is necessary to perform corrections according to the corresponding calculation methods according to the test results, such as no-load carrier shape correction, load loss resistance correction and temperature calibration. These calibrations are currently recorded manually by item, and then input into the excel calculation form of the PC for calculation. This operation is not only extremely inefficient, but also due to operator intervention, problems such as recording errors, intentional modifications, input errors, and calculation errors are prone to occur. The reliability of the overall test results is further reduced, which makes the final report serious.

4. According to the requirements of relevant standards, high-energy-efficiency transformers need to be inspected for each energy-efficiency project. Due to the huge number of transformers, only the material warehouse has storage capacity. Therefore, the inspection work can only be carried out in the material warehouse and the inspection efficiency must be improved to a certain extent. In order to meet the warehouse inspection, it is not currently possible.

Therefore, the testing equipment must have the characteristics of complete integration, convenient movement, complete test items, and simple operation. Currently, existing equipment cannot meet the above testing requirements.

Contents of the invention

The object of the present invention is to provide a power transformer energy efficiency level detection device which can complete the energy efficiency level detection in an integrated manner and is simple and convenient to use.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An energy efficiency level detection device for a power transformer is used to detect an energy efficiency level for a power transformer to be detected. The power transformer energy efficiency level detection device includes an IPC central control unit, a PLC electrical core controller, a physical button, a DC resistance test unit, a no-load/load test unit, an output wiring switching unit, and an output wiring interface; the IPC central control unit communicates interactively with the PLC electrical core controller. The units are respectively connected to the output wiring switching unit, and the output wiring interface is connected to the output wiring switching unit;

The physical button is used to output detection trigger information for detecting the energy efficiency level of the power transformer;

The IPC central control unit is used to acquire the basic information of the power transformer, calculate the parameter values required for energy efficiency level detection based on the basic information of the power transformer, receive the detection trigger information output by the physical key through the PLC electrical core controller and issue corresponding detection instructions, provide a wiring guide diagram for the energy efficiency level detection, obtain corresponding detection data through the DC resistance test unit and no-load/load test unit, correct the detection data to obtain corrected data, determine the energy efficiency level of the power transformer based on the corrected data, and generate a power transformer energy efficiency level test report;

The PLC electrical core controller is used to control the output wiring switching unit according to the detection instruction to realize the switching of the DC resistance test unit and the no-load/load test unit, control the power supply and communication of the DC resistance test unit and the no-load/load test unit according to the detection instruction, and control the detection of the physical button;

The DC resistance testing unit is used to perform a DC resistance test on the power transformer to obtain the corresponding detection data;

The no-load/load test unit is used to perform a no-load loss test and a load loss test on the power transformer to obtain the corresponding detection data;

The output wiring switching unit is used to connect the DC resistance testing unit or the no-load/load testing unit to the output wiring interface under the control of the PLC electrical core controller;

The output wiring interface is used to connect to the power transformer.

The no-load/load test unit includes a frequency conversion and voltage regulation electronic power supply, a capacitor compensation unit, and a voltage, current and power measurement unit; the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit and the voltage, current and power measurement unit are all connected to the PLC electrical core controller, the frequency conversion and voltage regulation electronic power supply is connected to the IPC central control unit, and the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit, and the voltage and current power measurement unit are all connected to the output wiring switching unit;

The frequency conversion and voltage regulation electronic power supply is used to output the corresponding test power supply according to the parameter values required for the energy efficiency level detection calculated by the IPC central control unit, and the test power supply is supplied to the power transformer through the output wiring switching unit;

The capacitor compensation unit is used to compensate the power transformer when performing a load loss test, and the capacitor compensation unit is connected to the power transformer through the output wiring switching unit;

The voltage, current and power measurement unit is used to obtain the detection data when performing no-load loss test and load loss test, and the voltage, current and power measurement unit is connected to the power transformer through the output wiring switching unit.

The IPC central control unit is connected to a scanning gun and/or an input module, the scanning gun acquires basic information of the power transformer by scanning the two-dimensional code or barcode, and the input module is used to manually input the basic information of the power transformer.

The IPC central control unit is connected with the temperature measuring sensor of the power transformer to obtain the temperature of the transformer.

The IPC central control unit is configured with a network interface with a network access function, and the IPC central control unit communicates with the system background or server through the network interface.

The output wiring interface includes a power contact and a compensation contact, the power contact is connected to the frequency conversion and voltage regulation electronic power supply for the frequency conversion and voltage regulation electronic power supply to connect to the low voltage side or high voltage side of the power transformer, the compensation contact is connected to the capacitor compensation unit for the capacitor compensation unit to connect to the power transformer.

Both the power supply contact and the compensation contact are equipped with switch auxiliary feedback nodes for feeding back their switching states, and the switch auxiliary feedback nodes are connected to the PLC electrical core controller.

The power transformer energy efficiency level detection device also includes a state indication module connected with the PLC electrical core controller.

The power transformer energy efficiency level detection device also includes an integrated mobile chassis, a plurality of modular combined boxes or an integrated container.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art: the present invention completes each test item of energy efficiency level detection at one time through a single set of equipment and performs corresponding corrections, the operation is simple and convenient, and meets the requirements of power transformer energy efficiency level detection.

Description of drawings

Accompanying drawing 1 is the structural block diagram of the power transformer energy efficiency grade detection device of the present invention.

Figure 2 is a schematic front view of the first appearance of the power transformer energy efficiency level detection device of the present invention.

Accompanying drawing 3 is the schematic plan view of the first appearance of the power transformer energy efficiency level detection device of the present invention.

Figure 4 is a schematic front view of the second appearance of the power transformer energy efficiency level detection device of the present invention.

Figure 5 is a schematic top view of the second appearance of the power transformer energy efficiency level detection device of the present invention.

Figure 6 is a schematic front view of the third appearance of the power transformer energy efficiency level detection device of the present invention.

Accompanying drawing 7 is the schematic rear view of the third appearance of the power transformer energy efficiency level detection device of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

Embodiment 1: As shown in Figure 1, a power transformer energy efficiency level detection device includes an IPC central control unit, a PLC electrical core controller, physical buttons, a DC resistance test unit, a no-load/load test unit, an output wiring switching unit, and an output wiring interface. The IPC central control unit communicates interactively with the PLC electrical core controller. The physical buttons, no-load/load test unit, and output wiring switching unit are respectively connected to the PLC electrical core controller. The DC resistance test unit and no-load/load testing unit are respectively connected to the output wiring switching unit, and the output wiring interface is connected to the output wiring switching unit. The power transformer energy efficiency level detection device may also include a status indication module connected with the PLC electrical core controller and an emergency stop button.

The physical button is used to output the detection trigger information for the energy efficiency level detection of the power transformer, that is, to initiate the energy efficiency detection. The DC resistance test unit is used to perform DC resistance test on the power transformer to obtain corresponding detection data. The no-load/load test unit is used to perform no-load loss test and load loss test on the power transformer to obtain corresponding detection data. The no-load/load test unit includes frequency conversion and voltage regulation electronic power supply, capacitor compensation unit and voltage, current and power measurement unit (U, I, P measurement unit). The frequency conversion and voltage regulation electronic power supply, capacitor compensation unit and voltage and current power measurement unit are all connected to the PLC electrical core controller, the frequency conversion and voltage regulation electronic power supply is connected to the IPC central control unit, and the frequency conversion and voltage regulation electronic power supply, capacitor compensation unit, voltage and current power measurement unit are all connected to the output wiring switching unit. The frequency conversion and voltage regulation electronic power supply is used to output the corresponding test power supply according to the parameter values required for energy efficiency level detection calculated by the IPC central control unit, and the test power supply is then supplied to the power transformer through the output wiring switching unit. The capacitor compensation unit is used for compensating the power transformer during the load loss test, and the capacitor compensation unit is connected with the power transformer through the output wiring switching unit. The voltage, current and power measurement unit is used to obtain detection data during the no-load loss test and load loss test, and the voltage, current and power measurement unit is connected to the power transformer through the output wiring switching unit. The output wiring switching unit is used to connect the DC resistance test unit or the no-load/load test unit to the output wiring interface under the control of the PLC electrical core controller. The output wiring interface is used to connect the power transformer. The output wiring interface includes a power contact and a compensation contact. The power contact is connected to the frequency conversion and voltage regulation electronic power supply and the frequency conversion and voltage regulation electronic power supply is connected to the low voltage side or high voltage side of the power transformer. The compensation contact is connected to the capacitor compensation unit and the capacitor compensation unit is connected to the power transformer.

The IPC central control unit can realize the following functions:

a) It is used to obtain the basic information of the power transformer. The IPC central control unit can be connected with the scanning gun and/or the input module. The scanning gun is used to obtain the basic information of the power transformer by scanning the QR code or barcode. The input module is used to manually enter the basic information of the power transformer;

b) Calculate the parameter values required for energy efficiency level detection based on the basic information of the power transformer, including DC resistance test current, no-load loss test voltage and load loss test voltage, current and compensation capacity;

c) Receive the detection trigger information output by the physical key through the PLC electrical core controller and issue corresponding detection instructions. The operator triggers different detection items through the physical key, and the IPC central control unit receives the corresponding detection trigger information, gives the corresponding test items, and can give prompt information to complete the test;

d) For each test item, provide a wiring guide diagram for energy efficiency level detection through the configured display device, guide the testers to perform wiring, and ensure the correctness of the test connection;

e) Obtain corresponding detection data (test results) through the DC resistance test unit and the no-load/load test unit;

f) Correct the detected data to obtain the corrected data. After the DC resistance test, no-load loss test, and load loss test are completed in sequence, the system reads the transformer temperature measured by the configured temperature sensor according to the input transformer information, and at the same time, the IPC central control unit is connected to the temperature sensor of the power transformer. Comprehensive test results, transformer information and test temperature, automatically generate corrected data after waveform correction, resistance correction and temperature correction;

g) Determine the energy efficiency level of the power transformer based on the corrected data, that is, according to the limit value of the energy efficiency level given in "GB20052-2020 Energy Efficiency Limits and Energy Efficiency Levels of Power Transformers", combined with the material option of whether the iron core is an electrical steel strip or an amorphous alloy in the transformer information, compare the test value to automatically determine the energy efficiency level of the tested power transformer;

h) Generate a power transformer energy efficiency level test report, which includes the test data before and after correction and the energy efficiency level of the tested power transformer and other information. In particular, the report format can be customized and modified according to different requirements to meet individual requirements.

In addition, the IPC central control unit can also have the following functions:

i) The IPC central control unit is equipped with a network interface with network access function. The IPC central control unit communicates with the system background or server through its network interface, so that the IPC central control unit can send the unique identity serial number of the energy efficiency detection device itself, the information of the power transformer under test, the test process, results, reports and environmental information to the network background or the designated server.

The PLC electrical core controller can realize the following functions:

a) Control the output wiring switching unit according to the detection command output by the IPC central control unit to realize the switching of the DC resistance test unit and the no-load/load test unit, that is, control the switching of the corresponding electrical connection when the test item is converted. And switch the corresponding compensation capacitor according to the capacity of the power transformer under test. The switching of the above electrical connections is checked at the same time through the switch auxiliary feedback node. That is, the power contact and the compensation contact are equipped with switch auxiliary feedback nodes that feedback their switching status. The switch auxiliary feedback node is connected with the PLC electrical core controller to complete the switching feedback.

b) According to the detection command of the IPC central control unit, the power supply and communication of the DC resistance test unit and the no-load/load test unit are controlled, and when the test function is not performed, the test module is not powered, which reduces the mutual interference between the test units and also reduces the power consumption of the energy efficiency detection device;

c) Control the detection of physical buttons, including the detection of control physical buttons, the detection of emergency stop buttons, the detection of status indication modules, and the like.

The detection of the above-mentioned power transformer energy efficiency level detection device is mainly based on the two modules of the DC resistance test unit and the no-load/load test unit. Both of them are electrically input and cut out through the PLC, and the test item functions can be realized with only one set of external test lines. The DC resistance test, no-load loss and load loss test can meet the requirements of one-time wiring and multiple test items. The central control unit adopts an IPC central control unit with a touch display screen, which is easy to operate and has strong expandability.

According to the standard requirements of the test guidelines, the steps of using the above-mentioned power transformer energy efficiency level detection device to detect the power transformer to be tested include DC resistance test, no-load test and load test. During the test, 1) the IPC central control unit records the relevant basic information of the tested power transformer through a code scanner or manual input; 2) The IPC central control unit automatically calculates the DC resistance test current, no-load test voltage, load test voltage and current and supplementary capacity according to the basic information of the power transformer under test; Guide diagram; 4) When the wiring is completed and the wiring is correct, start the DC resistance test through the DC resistance test unit, including the line resistance and phase resistance of the power transformer under test. Automatically test and record; 5) After the DC resistance test is completed, the IPC central control unit automatically records the test results, receives the input of the no-load test button and prompts the no-load test wiring guide map; Power, apparent power, voltage frequency, etc.; 7) Complete the no-load test, and the IPC central control unit corrects the test results and records the test results; 8) The IPC central control unit receives the input of the load test button and prompts the load test wiring guide; 9) Automatically switches the corresponding compensation capacitor, and boosts the current to the test current (not less than 50% of the rated current), records the test data (voltage RMS, voltage average value, current RMS value, active power, apparent power, voltage frequency, etc.) 10) After the no-load test is completed, the IPC central control unit reads the measured value of the temperature sensor of the test transformer temperature, performs temperature correction on the test result and records the test result; 11) Compared with the limit value of no-load loss given in "GB20052-2020 Power Transformer Energy Efficiency Limits and Energy Efficiency Grades", the energy efficiency level of the power transformer is automatically judged and recorded in the test report; Relevant quantities such as environmental information are sent to the network background or designated server without any sense; 13) Complete the test and wait for the next transformer test to start.

The above-mentioned power transformer energy efficiency level detection device also includes an integrated mobile chassis, a plurality of modularized combined boxes or an integrated container, the details are as follows:

a) For testing small-capacity transformers (not greater than 630kVA/10kV distribution transformers), each functional module is built in an integrated mobile chassis, which meets the requirements of portability in terms of volume and weight, and is easy to use on site or in a transformer storage warehouse.

b) For testing medium-capacity transformers (not greater than 1250kVA/10kV distribution transformers), multiple (such as two) modular combined boxes are used. Different functional modules are distributed in different modular combined boxes, and the modular combined boxes can be docked and stacked through the corresponding docking mechanism. The modular combined box is an independent module during transportation, and it is superimposed into one test equipment during testing. The necessary connections between the two modular combined boxes are made with cables. The volume and weight of a single module meet the requirements of portability and are easy to use on site or in transformer storage warehouses. The structural form is shown in Figures 4 and 5;

c) For power transformers with medium or higher capacity (greater than 1250kVA/10kV distribution transformers and power transformers), an integrated container structure is adopted, which is hoisted and transported as a whole. During the test, only the power supply and the output connection line need to be connected to complete the test project. It is easy to use on site or in the transformer storage warehouse.

Based on the test requirements of two related standards, the present invention realizes a single set of equipment, completes three test items of energy efficiency level detection and corresponding corrections at one time, automatically issues test reports and level evaluation, and sends test data and results to the network platform or server in real time to meet the technical requirements of power transformer energy efficiency level detection. The beneficial effects are as follows:

1) Portable: modular, lightweight, and integrated wheeled structure for easy movement (small-capacity testing platform), convenient for warehouse and on-site testing;

2) Accurate: Full inspection of energy efficiency items, the inspection process and accuracy meet the requirements of national standards and industry standards (measurement accuracy: voltage, current 0.1 level, power 0.2 level)

3) Simple: One-key operation, automatic test, report generation, and remote data transmission. In particular, it can be operated without professional personnel and simple training;

4) Fast: fast anti-reverse wiring, programmed process control, single detection does not exceed 15 minutes;

5) Reliable: capacity margin, long-term work, shockproof structure for easy transportation.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

An energy efficiency level detection device for a power transformer, which is used to detect an energy efficiency level of a power transformer to be detected, wherein the power transformer energy efficiency level detection device includes an IPC central control unit, a PLC electrical core controller, physical buttons, a DC resistance test unit, a no-load/load test unit, an output wiring switching unit, and an output wiring interface; The load/load test unit is respectively connected to the output wiring switching unit, and the output wiring interface is connected to the output wiring switching unit;

The physical button is used to output detection trigger information for detecting the energy efficiency level of the power transformer;

The IPC central control unit is used to acquire the basic information of the power transformer, calculate the parameter values required for energy efficiency level detection based on the basic information of the power transformer, receive the detection trigger information output by the physical key through the PLC electrical core controller and issue corresponding detection instructions, provide a wiring guide diagram for the energy efficiency level detection, obtain corresponding detection data through the DC resistance test unit and no-load/load test unit, correct the detection data to obtain corrected data, determine the energy efficiency level of the power transformer based on the corrected data, and generate a power transformer energy efficiency level test report;

The PLC electrical core controller is used to control the output wiring switching unit according to the detection instruction to realize the switching of the DC resistance test unit and the no-load/load test unit, control the power supply and communication of the DC resistance test unit and the no-load/load test unit according to the detection instruction, and control the detection of the physical button;

The DC resistance testing unit is used to perform a DC resistance test on the power transformer to obtain the corresponding detection data;

The no-load/load test unit is used to perform a no-load loss test and a load loss test on the power transformer to obtain the corresponding detection data;

The output wiring switching unit is used to connect the DC resistance testing unit or the no-load/load testing unit to the output wiring interface under the control of the PLC electrical core controller;

The output wiring interface is used to connect to the power transformer;

The no-load/load test unit includes a frequency conversion and voltage regulation electronic power supply, a capacitor compensation unit, and a voltage, current and power measurement unit; the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit and the voltage, current and power measurement unit are all connected to the PLC electrical core controller, the frequency conversion and voltage regulation electronic power supply is connected to the IPC central control unit, and the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit, and the voltage and current power measurement unit are all connected to the output wiring switching unit;

The frequency conversion and voltage regulation electronic power supply is used to output the corresponding test power supply according to the parameter values required for the energy efficiency level detection calculated by the IPC central control unit, and the test power supply is supplied to the power transformer through the output wiring switching unit;

The capacitor compensation unit is used to compensate the power transformer when performing a load loss test, and the capacitor compensation unit is connected to the power transformer through the output wiring switching unit;

The voltage, current and power measurement unit is used to obtain the detection data when performing no-load loss test and load loss test, and the voltage and current power measurement unit is connected to the power transformer through the output wiring switching unit;

The IPC central control unit is connected with a scanning gun and/or an input module, the scanning gun obtains its basic information by scanning the two-dimensional code or barcode of the power transformer, and the input module is connected to an input module for manually entering the basic information of the power transformer.

The IPC central control unit is connected with the temperature sensor of the power transformer to obtain the temperature of the transformer;

The IPC central control unit is configured with a network interface with a network access function, and the IPC central control unit communicates with the system background or server through its described network interface;

The output wiring interface includes a power contact and a compensation contact. The power contact is connected to the frequency conversion and voltage regulation electronic power supply for the frequency conversion and voltage regulation electronic power supply to connect to the low voltage side or high voltage side of the power transformer. The compensation contact is connected to the capacitor compensation unit and the capacitor compensation unit is connected to the compensation contact of the power transformer. Both the power supply contact and the compensation contact are equipped with a switch auxiliary feedback node for feeding back their switching status, and the switch auxiliary feedback node is connected to the PLC electrical core controller.

The power transformer energy efficiency level detection device also includes a state indication module connected to the PLC electrical core controller;

The power transformer energy efficiency level detection device also includes an integrated mobile chassis, a plurality of modular combined boxes or an integrated container.
An energy efficiency level detection device for a power transformer, which is used to detect an energy efficiency level of a power transformer to be detected, wherein the power transformer energy efficiency level detection device includes an IPC central control unit, a PLC electrical core controller, physical buttons, a DC resistance test unit, a no-load/load test unit, an output wiring switching unit, and an output wiring interface; The load/load test unit is respectively connected to the output wiring switching unit, and the output wiring interface is connected to the output wiring switching unit;

The physical button is used to output detection trigger information for detecting the energy efficiency level of the power transformer;

The IPC central control unit is used to acquire the basic information of the power transformer, calculate the parameter values required for energy efficiency level detection based on the basic information of the power transformer, receive the detection trigger information output by the physical key through the PLC electrical core controller and issue corresponding detection instructions, provide a wiring guide diagram for the energy efficiency level detection, obtain corresponding detection data through the DC resistance test unit and no-load/load test unit, correct the detection data to obtain corrected data, determine the energy efficiency level of the power transformer based on the corrected data, and generate a power transformer energy efficiency level test report;

The PLC electrical core controller is used to control the output wiring switching unit according to the detection instruction to realize the switching of the DC resistance test unit and the no-load/load test unit, control the power supply and communication of the DC resistance test unit and the no-load/load test unit according to the detection instruction, and control the detection of the physical button;

The DC resistance testing unit is used to perform a DC resistance test on the power transformer to obtain the corresponding detection data;

The no-load/load test unit is used to perform a no-load loss test and a load loss test on the power transformer to obtain the corresponding detection data;

The output wiring switching unit is used to connect the DC resistance testing unit or the no-load/load testing unit to the output wiring interface under the control of the PLC electrical core controller;

The output wiring interface is used to connect to the power transformer.
The power transformer energy efficiency level detection device according to claim 2, characterized in that: the no-load/load test unit includes a frequency conversion and voltage regulation electronic power supply, a capacitor compensation unit and a voltage and current power measurement unit; the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit and the voltage and current power measurement unit are all connected to the PLC electrical core controller, the frequency conversion and voltage regulation electronic power supply is connected to the IPC central control unit, and the frequency conversion and voltage regulation electronic power supply, the capacitor compensation unit, and the voltage and current power measurement unit are all connected to the output wiring switching unit;

The frequency conversion and voltage regulation electronic power supply is used to output the corresponding test power supply according to the parameter values required for the energy efficiency level detection calculated by the IPC central control unit, and the test power supply is supplied to the power transformer through the output wiring switching unit;

The capacitor compensation unit is used to compensate the power transformer when performing a load loss test, and the capacitor compensation unit is connected to the power transformer through the output wiring switching unit;

The voltage, current and power measurement unit is used to obtain the detection data when performing no-load loss test and load loss test, and the voltage, current and power measurement unit is connected to the power transformer through the output wiring switching unit.
The power transformer energy efficiency level detection device according to claim 2, characterized in that: the IPC central control unit is connected to a scanning gun and/or an input module, the scanning gun acquires basic information by scanning the two-dimensional code or barcode of the power transformer, and the input module is used to manually enter the basic information of the power transformer.
The power transformer energy efficiency level detection device according to claim 2, characterized in that: the IPC central control unit is connected with a temperature sensor of the power transformer to obtain the temperature of the transformer.
The device for detecting energy efficiency levels of power transformers according to claim 2, wherein the IPC central control unit is configured with a network interface with a network access function, and the IPC central control unit communicates with the system background or server through the network interface.
The power transformer energy efficiency level detection device according to claim 3, characterized in that: the output wiring interface includes a power contact and a compensation contact, the power contact is connected to the frequency conversion and voltage regulation electronic power supply for the frequency conversion and voltage regulation electronic power supply to connect to the low voltage side or high voltage side of the power transformer, and the compensation contact is connected to the capacitor compensation unit for the capacitor compensation unit to connect to the power transformer.
The power transformer energy efficiency level detection device according to claim 7, characterized in that: the power supply contact and the compensation contact are equipped with switch auxiliary feedback nodes for feeding back their switching status, and the switch auxiliary feedback nodes are connected to the PLC electrical core controller.
The device for detecting energy efficiency levels of power transformers according to claim 2, characterized in that: the device for detecting energy efficiency levels of power transformers further includes a status indication module connected to the PLC electrical core controller.
The power transformer energy efficiency level detection device according to claim 2, characterized in that: the power transformer energy efficiency level detection device further comprises an integrated mobile chassis, a plurality of modular combined boxes or an integrated container.