I. Product Overview

The device is mainly designed and manufactured for 10kV, 35kV, 110kV, 220kV cables, 110kV / 80000 kVA main transformer fully insulated, 110kV, 220kV GIS, switches and circuit breakers. The reactor adopts only separate designs, which can not only meet the requirements of high voltage and small current equipment test conditions, but also meet the requirements of low voltage AC voltage test such as 10kV cable. It has a wide range of application, and is the ideal high voltage test equipment of ground, city and county levels and power installation and repair engineering units.

The device is mainly composed of frequency conversion control power supply, excitation transformer, electric reactor and capacitor voltage divider.

Advantages of series resonance application in electric power systems：

1. The required power supply capacity is greatly reduced. The series resonant power supply is using the resonant reactor and the test product capacitor resonance to generate high voltage and high current. In the whole system, the power supply only needs to provide the active power consumption part of the system. Therefore, so the power supply required for the test is only 1 / Q of the test capacity.

2. The weight and volume of the equipment are greatly reduced. In the series resonant power supply, not only saves the heavy high-power voltage regulating device and the ordinary high-power power frequency test transformer, but also, the resonant shock magnetic power supply only needs 1 / Q of the test capacity, which makes the system weight and volume greatly reduced, generally 1 / 10 of the ordinary test device.

3. Improve the waveform of the output voltage. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sinusoidal waveform, and effectively prevent the misbreakdown of the harmonic peak on the test article.

4, prevent large short circuit current burn fault point. In the series resonance state, when the insulation weakness of the test article is broken down, the circuit is immediately deharmonic, and the circuit current quickly drops to 1 / Q of the normal test current. When the parallel resonance or test transformer does the voltage test, the breakdown current immediately rises tens of dozens of times. Compared with the two, the short circuit current and the breakdown current differ by hundreds of times. Therefore, the series resonance can effectively find the insulation weakness, and there is no large short circuit current burn fault point trouble.

5. There will be no recovery overvoltage. Test article breakdown, due to the loss of resonance conditions, high voltage also immediately disappear, the arc immediately out, and restore the voltage to establish the process is very long, it is easy to disconnect power before the flashover voltage, the voltage of the intermittent oscillation process is a kind of energy accumulation, the process is long, and there will not be any recovery over voltage.

Main functions and technical characteristics of FM resonance device：

1. The device has protection functions such as overvoltage, overcurrent, zero start, system detuning (flishover). The protection value of overvoltage and overcurrent can be adjusted according to user needs. When the test product is protected and the flashover voltage value can be recorded for test analysis.

2. The single weight of the whole device is very light and easy to use on site.

3. The device has three working modes, which are convenient for users to choose flexibly according to the site situation and improve the test speed. Working mode is: automatic mode, manual mode, automatic tuning manual boost mode.

4. Can store and print data in different places, and the deposited data number is digital, which is convenient to help users to identify and find。

5. The frequency starting point of the device can be set within the specified range, and the direction of the frequency can be selected up and down. At the same time, the LCD screen displays the scanning curve, so as for users to intuitively understand whether to find the resonance point.

6. The adopted DSP platform technology can easily increase or decrease functions and upgrade according to the needs of users, and also make the man-machine switching interface more humanized.