CN110389271A - Transformer testing system and method - Google Patents

Abstract

The invention relates to a transformer test system, which includes a measuring device and a control device, and the control device is connected with the measuring device. The measuring device includes: a variable frequency power supply, the variable frequency power supply is connected to the mains through a power supply line protection switch and a contactor; an intermediate transformer, the input side of the intermediate transformer is connected to the output terminal of the variable frequency power supply through a contactor, and a set of The contactors set in series are connected to the transformer to be tested; power frequency withstand voltage measuring instrument, DC resistance measuring instrument, insulation resistance measuring instrument, transformation ratio group measuring instrument and no-load measuring instrument, the signal input terminals of each measuring instrument are respectively connected in series After connecting the contactor, connect it in parallel with the input and output terminals of the transformer to be tested. The transformer testing system of the present invention can perform multiple tests on transformers under high and low voltage conditions such as insulation resistance, power frequency withstand voltage, direct resistance, transformation ratio, and no-load at the same time with one connection. The system can realize fully automatic testing with high measurement accuracy. The efficiency is high and fast, and the qualification of the test product is automatically judged.

Description

Transformer testing system and method

technical field

The invention belongs to the technical field of transformer testing, in particular to a transformer testing system and method.

Background technique

Transformer testing generally includes insulation resistance test, DC resistance test, no-load test, power multiplier withstand voltage and transformation ratio test, etc. Before leaving the factory, the transformer needs to carry out relevant experiments and use it only after the experimental data meet the national standard range, otherwise it is easy to exist. Serious accident hazard.

As far as the current transformer testing is concerned, most of them only measure and record a certain parameter of the transformer. For example, only the insulation resistance test, DC resistance test, insulating oil dielectric strength withstand voltage test, and no-load test can only be performed on the transformer. One of the tests in the test, power frequency multiplication withstand voltage and transformation ratio tests, the test instruments and test circuits need to be replaced frequently during the test, and multiple performance parameters cannot be tested at the same time. At the same time, when the existing transformer test system performs high-voltage and low-voltage tests on the transformer, it needs to perform tests under high-voltage or low-voltage conditions separately, and cannot perform tests under high-voltage conditions at the same time.

Therefore, it is necessary to improve the design of the above-mentioned existing transformer testing system, provide a transformer testing system that can simultaneously meet various performance tests of transformers under high and low voltage conditions, and improve efficiency.

Contents of the invention

Aiming at the deficiencies of the existing transformer testing system, the present invention provides a transformer testing system. The system can simultaneously realize the insulation resistance test, DC resistance test, no-load test, power frequency multiplication withstand voltage and variable voltage test of transformers under high and low voltage conditions. Various tests such as ratio testing, the system can realize fully automatic testing, with high measurement accuracy and high efficiency.

In order to achieve the above object, a transformer testing system includes a measuring device and a control device, the control device is connected to the measuring device, and is used to control the measuring device to test the transformer to be tested; the measuring device includes:

A variable frequency power supply, the variable frequency power supply is connected to the mains through a power supply inlet protection switch and a contactor;

An intermediate transformer, the input side of the intermediate transformer is connected to the output end of the frequency conversion power supply through a contactor, and the output side is connected to a group of contactors arranged in series and then connected to the transformer to be tested;

Power frequency withstand voltage measuring instrument, DC resistance measuring instrument, insulation resistance measuring instrument, ratio group measuring instrument and no-load measuring instrument, the signal input terminals of each measuring instrument are respectively connected in parallel to the input and output terminals of the transformer to be tested behind the switch array.

Preferably, the measurement device also includes a power analyzer, a precision current transformer and a precision voltage transformer; the signal input end of the power analyzer is connected to the input and output side of the transformer to be tested through a power sensor; the precision current transformer, Precision voltage transformers are used to measure the loop current and voltage between the transformer to be tested and the intermediate transformer.

Preferably, the control device includes a main control module, the main control module includes a central processing unit, an information collection unit, and an output control unit, and the central processing unit is connected to the information collection unit and the output control unit; the output The control unit includes the power frequency withstand voltage measuring instrument, the DC resistance measuring instrument, the insulation resistance measuring instrument, the transformation ratio group measuring instrument, the no-load measuring instrument and the intermediate transformer, the power analyzer, the precision current transformer, the precision voltage transformer Multiple groups of relays and contactors connected to the relay; the central processing unit is used to control the conduction of each relay and contactor, and control the insulation resistance, power frequency multiplication withstand voltage, direct resistance, no-load test and load test of the transformer to be tested; The information collection unit is connected with the measuring device, and is used to collect detection information of each measuring instrument and switch on-off information of each component.

Preferably, the main control module also includes a power supply unit, a communication unit, and an overcurrent protection unit, the power supply unit, communication unit, and overcurrent protection unit are connected to the central processing unit; the power supply unit is used to provide the main control The control power supply voltage required by the module; the communication unit is connected to the remote monitoring system for uploading the detection information of the transformer to be tested; the overcurrent protection unit is connected in series to the main circuit of the high and low voltage power supply for over stream protection.

Preferably, the central processing unit includes an insulation resistance test unit, a withstand voltage test unit, a DC resistance test unit, a transformation ratio test unit and an empty load test unit; the insulation resistance test unit is used to control the winding and iron core of the measurement transformer , the insulation resistance information between the radiator and the temperature measuring device; the withstand voltage test unit is used to control and measure the withstand voltage information between the winding, the iron core, the radiator and the temperature measuring device of the transformer when measuring power frequency or frequency multiplication; The DC resistance test unit is used to control and measure the resistance information of the winding of the transformer to be tested; the transformation ratio test unit is used to control and measure the transformation ratio information between the primary and secondary side windings of the transformer to be tested; the no-load test The unit is used to measure the no-load test voltage, no-load current and control loss of the transformer to be tested, as well as the test current, short-circuit impedance and load loss information of the load.

Preferably, the central processing unit also includes a high-voltage control unit and a low-voltage control unit, the high-voltage control unit is connected with the insulation resistance test unit, withstand voltage test unit, DC resistance test unit, transformation ratio test unit and no-load test unit respectively. The unit connection is used to perform insulation resistance, frequency multiplier withstand voltage, direct resistance, transformation ratio, and no-load tests on the transformer to be tested when controlling high voltage; the low-voltage control unit is respectively connected to the insulation resistance test unit, withstand voltage test unit, DC The resistance test unit, the transformation ratio test unit and the no-load test unit are connected to control the insulation resistance, power frequency withstand voltage, direct resistance, transformation ratio and no-load test of the transformer to be tested at low voltage.

Preferably, the central processing unit also includes a fault diagnosis and alarm unit, and the fault diagnosis and alarm unit is respectively connected to the insulation resistance test unit, withstand voltage test unit, DC resistance test unit, transformation ratio test unit and no-load test unit It is used for fault diagnosis based on the insulation resistance information, dielectric strength information, winding resistance information, primary and secondary side transformation ratio information, no-load loss, no-load current, and short-circuit impedance information of the transformer to be tested under high and low voltage conditions Alarm to monitor the fault information of the measuring device and the transformer under test.

Preferably, the main control device further includes an upper computer, the upper computer stores a system program for controlling the measurement of the transformer, the upper computer is connected with the main control module, and is used to control the insulation resistance, working Frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load test, and display the information of each test parameter.

A transformer testing method, using the transformer testing system, comprising:

Set the test system control mode to automatic test mode and manual control mode;

In the automatic control mode, the insulation resistance, power multiplier withstand voltage, direct resistance, transformation ratio, and no-load test of the transformer under test under high voltage or low voltage are respectively carried out, and the measurement results are stored in real time and the test conclusion is judged;

In the manual control mode, the insulation resistance, power multiplier withstand voltage, direct resistance, transformation ratio, and no-load test of the transformer under test under high voltage or low voltage are respectively carried out, and the measurement results are stored in real time and the test conclusion is judged.

Compared with prior art, advantage and positive effect of the present invention are:

The transformer test system provided by the present invention tests intermediate transformers, precision current transformers, precision voltage transformers, power analyzers, power frequency withstand voltage measuring instruments, DC resistance measuring instruments, insulation resistance measuring instruments, and transformation ratio group measuring instruments. The device is installed on the test bench at the same time, the control device communicates with each measuring instrument, controls the work of each test device, and can simultaneously realize the insulation resistance, power frequency multiplier withstand voltage, direct resistance, transformation ratio, and no-load test of the transformer under high and low voltage after one connection and other tests. Distributed design is adopted, and all test parts are set on the same test bench. Each test test is independent of each other and can be combined freely, which is convenient for installation and debugging, and can improve the reliability of the test system. The invention provides a test system, which can automatically conduct comprehensive tests on all high and low voltage data, completely solves the fusion problem between high and low voltage and different test instruments, and can automatically convert and store data accurately. At the same time, the system is also equipped with a manual control mode, which can realize the transformer performance test under high and low voltage under both manual control and automatic control modes.

Description of drawings

Fig. 1 is the structural representation of transformer testing system of the present invention;

Fig. 2 is the structural representation of measuring device;

Fig. 3 is a schematic structural diagram of the main control module;

Figure 4 shows the measurement results of a transformer monitoring.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the application, the technical solution in the embodiment of the application will be clearly described below in conjunction with the drawings in the embodiment of the application. Obviously, the described embodiment is the Some examples, but not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

The terms "comprising" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. For example, a process, method or system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally further includes Other steps or units inherent in these processes, methods, products or apparatus. In addition, the terms "first", "second", and "third", etc. are used to distinguish different objects, not to describe a specific order.

Since the existing transformer test system can only perform one of the tests of insulation resistance, power frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load test and other tests on the transformer, it cannot test multiple performance parameters at the same time . Moreover, when the existing transformer test system performs high-voltage and low-voltage tests on the transformer, it needs to perform tests under high-voltage or low-voltage conditions separately, and cannot perform tests under high-voltage conditions at the same time. When the transformer is tested at the factory, the test system needs to be replaced frequently, resulting in low test efficiency and poor test accuracy. In view of the above problems, the present invention starts from the perspective of designing a comprehensive transformer test system, considers the integration of multiple tests such as insulation resistance, power frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load test, etc., and designs a The transformer testing system can automatically perform various performance tests on transformers. Specifically:

This embodiment provides a transformer testing system, including a measuring device and a control device, the control device is connected to the measuring device, and is used to control the measuring device to test the transformer to be tested.

Referring to Figure 1 and Figure 2, the measuring device includes frequency conversion power supply, intermediate transformer, precision current transformer, precision voltage transformer, power analyzer, power frequency withstand voltage measuring instrument, DC resistance measuring instrument, insulation resistance measuring instrument, transformer Ratio group measuring instrument and empty load measuring instrument, etc. Among them, the frequency conversion power supply is connected to the mains through the power inlet protection switch and the contactor. The output end is connected to the input side of the intermediate transformer after being connected in series with the contactor. The input side of the transformer under test. The test bench controls the output voltage of the transformer to be tested by adjusting the variable frequency power supply and the intermediate transformer for the test of the transformer to be tested. Precision current transformers and precision voltage transformers are used to measure the loop current and voltage between the transformer to be tested and the intermediate transformer; the signal input terminal of the power analyzer is connected to the input and output terminals of the transformer to be tested through a power sensor, which can effectively analyze the transformer under no-load conditions. power consumption. The signal input terminals of each measuring instrument such as power frequency withstand voltage measuring instrument, DC resistance measuring instrument, insulation resistance measuring instrument, transformation ratio group measuring instrument and no-load measuring instrument are respectively connected in parallel to the input and output sides of the transformer to be tested after the switch array. Measure the performance parameters of transformer insulation resistance test, DC resistance test, power multiplier withstand voltage test, transformation ratio test and no-load test respectively.

The test system of this embodiment includes an intermediate transformer, a precision current transformer, a precision voltage transformer, a power analyzer, a power frequency withstand voltage measuring instrument, a DC resistance measuring instrument, an insulation resistance measuring instrument, a transformation ratio group measuring instrument, and an empty load Measuring instruments and other devices are installed on the test bench at the same time, and the control device communicates with each measuring instrument to control the work of each test device. It can simultaneously realize the insulation resistance test, DC resistance test, power frequency multiplication withstand voltage test, Ratio test and no-load test and other tests. Distributed design is adopted, each measuring device is on the same test bench, and each test test is independent of each other and can be combined freely, which is convenient for installation and debugging, and can improve the reliability of the test system.

Referring to FIG. 1 and FIG. 3 , for the control device, the control device in this embodiment includes a main control module and a host computer. Among them, the main control module is the core control part of the test system, including the central processing unit, information collection unit, output control unit, power supply unit, overcurrent protection unit and communication unit, central processing unit and information collection unit, output control unit, power supply unit, overcurrent protection unit and communication unit connection. The information collection unit is connected with the measuring device, and is used to collect the detection information of each measuring instrument and the on-off information of each component. The output control unit includes a power frequency withstand voltage measuring instrument, a DC resistance measuring instrument, an insulation resistance measuring instrument, a transformation ratio group measuring instrument, an empty load measuring instrument, an intermediate transformer, a power analyzer, a precision current transformer, and a precision voltage transformer. Connected groups of relays and contactors. The central processing unit is used to control the conduction of each relay and contactor, and control the insulation resistance, power multiplier withstand voltage, direct resistance, no-load test and load test of the transformer to be tested. The power supply unit is used to provide the control power supply voltage required by the main control module. The overcurrent protection unit is connected in series to the main circuit of the high and low voltage power supply for overcurrent protection. The communication module can be connected with the remote monitoring system for uploading the detection information of the transformer to be tested. The upper computer is connected with the main control module, and stores the system program for controlling the measurement of the transformer, and controls the insulation resistance test, DC resistance test, power frequency multiplication withstand voltage test, transformation ratio test and no-load test of the transformer to be tested under high and low voltage conditions. A variety of tests, and display the information of each test parameter.

In order to describe in detail the system's tests on transformer insulation resistance, power multiplier withstand voltage, direct resistance, transformation ratio, no-load, etc., refer to Figure 3 and Figure 4. Figure 4 shows the measurement results of a transformer. In this embodiment, the central processor is specifically designed as an insulation resistance test unit, a withstand voltage test unit, a DC resistance test unit, a transformation ratio test unit, an empty load test unit, a high voltage control unit, a low voltage control unit, and a fault diagnosis and alarm unit. Among them, the insulation resistance test unit controls the relay, the contactor is connected to the signal output terminal of the insulation resistance measuring instrument, and is used to measure the insulation resistance information between the winding, iron core, radiator and temperature measuring device of the transformer; the withstand voltage test unit controls the relay It is connected to the signal output terminal of the power frequency withstand voltage measuring instrument, and is used to measure the leakage current information between the winding, iron core, shielding layer and through-hole bolts of the transformer at power frequency or frequency multiplication. Taking the test of a three-phase transformer as an example, the insulation resistance test unit and the withstand voltage test unit control the insulation resistance tester and the power frequency withstand voltage tester to measure windings and iron cores, windings and windings, windings and shielding layers, and iron cores and piercing iron Resistance and current information between core bolts.

The DC resistance testing unit controls the relay and the contactor to be connected to the signal output end of the DC resistance measuring instrument, and is used for measuring the DC resistance value of the winding of the transformer to be tested. Taking the measurement of a three-phase transformer as an example, the DC resistance test unit controls the DC resistance measuring instrument to measure the resistance of the winding P1, the resistance of the winding S1 and the resistance of the winding S2.

The transformation ratio test unit controls the relay, the contactor and the signal output terminal of the transformation ratio group measuring instrument to measure the ratio information of the current, voltage or turns of the primary and secondary side windings of the transformer to be tested. Taking the measurement of a three-phase transformer as an example, the transformation ratio test unit controls the transformation ratio group measuring instrument to measure the transformation ratio information between the windings P1 and S1, and between P1 and S2.

The no-load measurement unit controls the relay, the contactor and the signal output terminal of the no-load measuring instrument to measure the no-load current, no-load loss and test voltage information of the transformer under test, or the test current and short circuit when the transformer is under load. Impedance and load loss and other information. Taking the measurement of a three-phase transformer as an example, the no-load measurement unit controls the no-load measuring instrument and the power analyzer to measure the transformer A-B phase voltage, B-C phase voltage, C-A phase voltage, A-phase current, B-phase current, and C-phase current at no-load. , no-load current and other information; when measuring the load, the transformer's load loss, A1-A2 impedance, B1-B2 impedance and C1-C2 impedance and other information.

The high-voltage control unit is respectively connected with the insulation resistance test unit, withstand voltage test unit, DC resistance test unit, transformation ratio test unit, and no-load test unit, and is used to control the insulation resistance, frequency multiplier withstand voltage, and direct resistance of the transformer to be tested at high voltage. , Ratio, no-load and other tests. The low-voltage control unit is respectively connected with the insulation resistance test unit, withstand voltage test unit, DC resistance test unit, transformation ratio test unit, and no-load test unit, and is used to control the insulation resistance, power frequency withstand voltage, and DC resistance of the transformer to be tested at low voltage. , Ratio, no-load and other tests. After the system is powered on, if it is necessary to perform a high-voltage performance test on the transformer, the system controls the intermediate transformer to be connected to adjust the voltage to the required high-voltage range, such as 1500V. Conduct insulation resistance, frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load and other tests; if it is necessary to perform low-voltage performance tests on the transformer, the system controls the intermediate transformer to adjust the voltage to the required low-voltage range, such as 45V, to be tested when low voltage is achieved Transformers are tested for insulation resistance, power frequency withstand voltage, direct resistance, transformation ratio, and no-load.

The fault diagnosis and alarm unit is respectively connected with the insulation resistance test unit, withstand voltage test unit, DC resistance test unit, transformation ratio test unit, and no-load test unit, and is used to judge the insulation resistance and dielectric strength information of the transformer to be tested under high and low voltage conditions. , winding resistance information, primary and secondary side transformation ratio information, and no-load loss, no-load current, short-circuit impedance and other information for fault diagnosis and alarm to monitor the fault information of the measuring device and the transformer to be tested. The control device has a built-in automatic storage device, which can be stored in large quantities. After the test is completed, the test results are automatically archived in the database and the test report can be printed out immediately; at the same time, the upper computer can display various fault information and upload the test information to remote The terminal monitoring system realizes remote intelligent management and fault prediction, with a high degree of intelligence.

The transformer test system of the present invention can automatically conduct comprehensive tests on all high and low voltage data by a fully automatic test platform, which completely solves the fusion problem between high and low voltage and different test instruments, automatic conversion, automatic storage, easy traceability, accurate data, All done automatically by the test system. At the same time, the system is also equipped with a manual test module, which can be manually set to test the insulation resistance, frequency multiplier withstand voltage, direct resistance, transformation ratio, and no-load of the transformer. The system combines manual test and automatic test mode, and can realize transformer performance test under high and low voltage under both manual control and automatic control modes.

For the above-mentioned transformer test system, the present invention also provides a corresponding test method. The control mode of the test system is set to automatic test mode and manual control mode, and the working mode can be selected through the manual/automatic knob on the control panel of the test system. Then in the automatic control mode, the transformer to be tested is tested for insulation resistance, frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load, etc. under high voltage or low voltage, and the measurement results are stored in real time. Through the manual operation interface of the upper computer, select automatic test, insulation resistance test, withstand voltage test, DC resistance test, transformation ratio group test, no-load test or load test to perform corresponding tests on the transformer to be tested, and automatically determine the quality of the tested product Test Conclusions. Or in the manual control mode, test the insulation resistance, frequency multiplier withstand voltage, direct resistance, transformation ratio, no-load, etc. of the transformer to be tested under high voltage or low voltage, and store the measurement results in real time. Select the high voltage or low voltage test of the transformer to be tested through the power button on the control panel of the test system; through the manual operation interface of the control panel, select insulation resistance test, withstand voltage test, DC resistance test, transformation ratio group test, no-load test And load test, etc. to test the transformer under test, and automatically determine the test conclusion of the tested product.

Claims (9)

1. a kind of Testing System of Transformer, including measuring device and control device, the control device and the measuring device connect It connects, transformer to be measured is tested for control and measure device；It is characterized in that, the measuring device includes:

Variable-frequency power sources, the variable-frequency power sources connect alternating current by electric power incoming line protective switch and contactor；

Intermediate transformer, the intermediate transformer input side are connect by contactor with the variable-frequency power sources output end, outlet side Transformer to be measured is accessed after connecting one group and the contactor that is arranged in series；

Industrial frequency withstand voltage measuring instrument, direct current resistance measurer, insulation measurement instrument, no-load voltage ratio group measuring instrument and empty load measure Instrument, each measuring instrument signal input part are parallel to transformer input/output terminal to be measured respectively and after switch arrays.

2. Testing System of Transformer according to claim 1, which is characterized in that the measuring device further includes power analysis Instrument, precision current transformer and accurate voltage mutual inductor；The power analyzer signal input part is connected by power sensor To transformer input and output to be measured side；The precision current transformer, accurate voltage mutual inductor for measure transformer to be measured with Loop current, voltage between intermediate transformer.

3. Testing System of Transformer according to claim 1 to 2, which is characterized in that the control device includes master control mould Block, the main control module include central processing unit, information acquisition unit and output control unit, the central processing unit and institute State information acquisition unit and output control unit connection；The output control unit include with the industrial frequency withstand voltage measuring instrument, Direct current resistance measurer, insulation measurement instrument, no-load voltage ratio group measuring instrument, idling carry measuring instrument and intermediate transformer, power The multiple groups relay and contactor that analyzer, precision current transformer, accurate voltage mutual inductor connect；The central processing unit is used In the conducting for controlling each relay and contactor, controls and insulation resistance, the pressure resistance of work frequency multiplication, straight resistance, sky are carried out to transformer to be measured Carry test and load testing；The information acquisition unit is connect with the measuring device, for acquiring the detection of each measuring instrument The switch on and off information of information and each component.

4. Testing System of Transformer according to claim 3, which is characterized in that the main control module further includes power supply list Member, communication unit and over-current protecting unit, the power supply unit, communication unit, over-current protecting unit and the central processing Device connection；The power supply unit is for control supply voltage needed for providing main control module；The communication unit and remote monitoring System connection, for uploading the detection information of transformer to be measured；The over-current protecting unit is connected in series to the main electricity electricity of high-low voltage power source Lu Zhong, for carrying out overcurrent protection.

5. Testing System of Transformer according to claim 3, which is characterized in that the central processing unit includes insulation resistance Test cell, proof voltage test cell, D.C. resistance test cell, no-load voltage ratio test cell and idling carry test cell；It is described Megger test unit is used to control the insulated electro between winding, iron core, radiator and the temperature measuring device of measuring transformer Hinder information；The proof voltage test cell be used to control measure power frequency or the winding of transformer when frequency multiplication, iron core, radiator and Pressure-resistant information between temperature measuring device；The D.C. resistance test cell is used to control the resistance value for the winding for measuring transformer to be measured Information；The no-load voltage ratio test cell is used to control the no-load voltage ratio information measured between transformer primary secondary side winding to be measured；The sky Load testing unit is used to measure test voltage, no-load current and the control loss when zero load of transformer to be measured, and negative Test current, short-circuit impedance and load loss information when load.

6. Testing System of Transformer according to claim 5, which is characterized in that the central processing unit further includes high voltage-controlled Unit and low voltage control unit processed, the high voltage control unit are single with the megger test unit, proof voltage test respectively Member, D.C. resistance test cell, no-load voltage ratio test cell and idling carry test cell connection, to change to be measured when for controlling high pressure Depressor carries out insulation resistance, frequency multiplication pressure resistance, straight resistance, no-load voltage ratio, empty load testing；The low voltage control unit respectively with the insulation Resistance test unit, proof voltage test cell, D.C. resistance test cell, no-load voltage ratio test cell and idling carry test cell and connect It connecing, insulation resistance, industrial frequency withstand voltage, straight resistance, no-load voltage ratio, empty load testing being carried out to transformer to be measured when for controlling low pressure.

7. Testing System of Transformer according to claim 6, which is characterized in that the central processing unit further includes that failure is examined Disconnected alarm unit, the fault diagnosis alarm unit respectively with the megger test unit, proof voltage test cell, direct current Resistance test unit, no-load voltage ratio test cell and idling carry test cell connection, transformer to be measured when for according to high-low pressure Insulation resistance information, dielectric strength information, the resistance value information of winding, former secondary side no-load voltage ratio information and idling load-loss, zero load Electric current, short-circuit impedance information carry out fault diagnosis alarm, to monitor the fault message of measuring device and transformer to be measured.

8. Testing System of Transformer according to claim 3, which is characterized in that the master control set further includes host computer, The host computer is stored with the system program for controlling transformer measurement, and the host computer is connected to the main control module, and uses Insulation resistance, the pressure resistance of work frequency multiplication, straight resistance, no-load voltage ratio, empty load testing are carried out to transformer to be measured in control, and show each test ginseng Number information.

9. a kind of transformer testing method, using the described in any item Testing System of Transformer of claim 1-8, feature exists In, comprising:

Automatic test pattern and manual control mode are set by test macro control model；

Carry out insulation resistance under the high pressure or low pressure, pressure resistance of work frequency multiplication, straight respectively to transformer to be measured under automatic control mode Resistance, no-load voltage ratio, empty load testing, and real-time storage measurement result simultaneously determine conclusion (of pressure testing)；

Carry out insulation resistance under the high pressure or low pressure, pressure resistance of work frequency multiplication, straight respectively to transformer to be measured under manual control mode Resistance, no-load voltage ratio, empty load testing, and real-time storage measurement result simultaneously determine conclusion (of pressure testing).