Frequency converter maintenance test system

A test system and frequency converter technology, applied in instruments, measuring electrical variables, measuring devices, etc., can solve the problems of various voltage levels of frequency converters, inability to test large current loads, difficulty in obtaining control power, etc., to achieve convenient circuit wiring debugging, The circuit is stable and the energy consumption is small

Active Publication Date: 2017-06-27
BEIJING SOLY TECH
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a frequency converter maintenance test system, which overcomes the deficiencies in the background technology, solves the problem that the voltage levels of frequency converters in metallurgical plants and mines are various and cannot be tested; solves the problem of frequency converters driving various load motor tests, In particular, it solves the problem of high-power inverters driving large loads, greatly reduces the cost of maintenance and testing of low-, medium-, and high-voltage inverters, and greatly improves equipment efficiency, reducing the occurrence of secondary failures in the use of inverters
The system solves the difficulties in obtaining multi-input power supply, DC power supply, and control power supply in the debugging process of low, medium and high voltage frequency converters, as well as the inability to carry out high-current load tests. High-level inverter test requirements, especially suitable for low-frequency debugging tests of high-power inverters with high-current loads with limited test conditions, and low energy consumption, saving energy

Method used

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Embodiment 1

[0033] Such as figure 1 Shown is the test structure diagram of Example 1 of the inverter maintenance test system of the present invention. Examples include inverter test control cabinet G1, inverter test control cabinet G2, tested inverter U, and tested high-power inverter without rectifier unit Inverter system I, dry-type transformer TC1, dry-type transformer TC2, this embodiment is suitable for low-voltage inverters and high-power inverters without rectifier units to drive large loads or no-load tests after maintenance. U can be a high-power grade inverter, or a medium- and small-power grade inverter, which can be adjusted through the inverter test control cabinet G1.

[0034] When the tested inverter drives a heavy load test, the inverter test control cabinet G1 works, and the dry-type transformers TC1 and TC2 are connected to the circuit through the contactor GYJ controlled by the inverter test control cabinet G1. At this time, adjust the tested inverter from 0Hz to slow Slow...

Embodiment 2

[0037] Such as figure 2 Shown is the test structure diagram of Embodiment 2 of the inverter maintenance test system of the present invention. The structure is changed on the basis of Embodiment 1. This embodiment is suitable for medium and high voltage inverters and high voltage DC bus inverters without rectifier units. Drive heavy load or no-load test after system maintenance.

[0038] By controlling the middle tap of the dry-type transformer TC1 and using the principle of self-coupling, it can output 690V AC voltage. The 690V input voltage of the tested inverter can be tested through the inverter test control cabinet G1. By adjusting the high-voltage side circuit of the dry-type transformer TC2 State, realize no-load and high-current load test. Through the frequency conversion test cabinet G2, it can achieve DC output of 550 ~ 1000V DC output, providing power for the inverter system of the high-voltage DC bus inverter without rectifier unit, and through the high-voltage side c...

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Abstract

The present invention provides a frequency converter maintenance test system, and belongs to the frequency converter maintenance test technology field. The system comprises dry type transformers TC1 and TC2, and frequency converter test control cabinets G1 and G2. The tap of the dry type transformer TC1 is regulated to perform conversion output of input power to the frequency converter test control cabinets G1 and G2, the dry type transformers TC1 employs a self-coupling mode to output voltage, the frequency converter test control cabinets G1 and G2 provide various types of power supplies of the frequency converter test and provide protective measures in the frequency converter maintenance test process, and the dry type transformer TC2 supplies heavy current load for the frequency converter and supplies low-frequency heavy current load basis. The frequency converter maintenance test system solves the problems that multi-input power supply, direct-current source and control power in the low, medium and high voltage frequency converter debugging are difficult to obtain and cannot perform heavy current load test; only one set of the system can satisfy the frequency converter test requirement of each voltage grade, and the frequency converter maintenance test system is suitable for low-frequency debugging test of a high-power frequency converter having heavy current load with limited test condition, and small in energy consumption and saved in energy.

Description

Technical field [0001] The invention belongs to the technical field of frequency converter maintenance test, and specifically relates to a frequency converter maintenance test system, which is suitable for various grades of frequency converter power input and frequency converter low frequency high current load test system limited by test conditions. Background technique [0002] A large number of electric motors are used in the metallurgical and mining industry, especially medium and high-voltage motors. The main power source of the motors is the frequency converter, which saves a lot of energy for the mining industry. The inverter voltage specifications of factories and mines are diverse and diverse, including 380V input, 690V input, DC 550V input and other inverters, especially medium and high voltage inverters. Inverters are expensive. New equipment is rarely replaced after the inverter fails. The original equipment needs to be repaired. However, the repaired inverter needs to...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 张立成高大伟娄猛朝马亚楠李文迟春革
Owner BEIJING SOLY TECH
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