Frequency modulation series resonance test device? Wuhan UHV specializes in producing frequency modulation series resonance test devices, with a wide range of product options. When looking for frequency modulation series resonance test devices, choose Wuhan UHV.         

Thefrequency modulation series resonance test device adopts a multi-stage superposition method, and multiple reactors can be used in parallel or series. The voltage divider is used to measure the test voltage and can also be used as a compensation capacitor for small capacitance test samples, allowing the resonance frequency to complete AC withstand voltage tests of various electrical equipment within the range of 30-300Hz. The basic principle of variable frequency series resonance is to use adjustable (30-300Hz) series resonance test equipment to resonate with the capacitor of the test object to generate an AC test voltage.

Main characteristics of frequency modulation series resonance test device:

1. The frequency modulation and power components use the most advanced high-quality components imported from Japan;

2. Fully utilize resources, independently develop, design, and produce all components of the equipment: variable frequency power supply, excitation transformer, high-voltage reactor, capacitor compensator, and high-precision capacitor voltage divider;

3. It has multiple functions including fully automatic (automatic tuning, automatic boosting), fully manual (manual frequency modulation, manual boosting), and semi-automatic (automatic frequency modulation, manual boosting, and manual tuning, automatic boosting), which can be switched and used freely;

4. Equipped with settings for test voltage, pressurization time, alarm current setting, alarm voltage setting, frequency range, and starting voltage;

5. Equipped with discharge protection function, in case of sudden resonance circuit mismatch caused by flickering or other reasons of the test sample, the variable frequency control power supply will immediately automatically and quickly cut off the output, and display the protection type and flashing voltage value;

6. Measure and display relevant information such as output voltage, output frequency, pressurization time, and protection action type. The voltage will automatically drop to zero upon completion of the test;

7. Large LCD full Chinese interface platform technology, full touch screen operation, voice prompt operation, data storage, and universal USB interface.

Operation steps of frequency modulation series resonance test device:

1.Firstly, based on the effective value of the test voltage, adjust the gap between the copper balls (at 3kV/mm) to ensure that the test voltage is not too high. When confirming that the voltage regulator is in zero position, connect the test sample and then turn on the power.

2. Tune at 20%, 50%, and 80% of the test voltage to find the resonance point.

3. Continue to increase the voltage until the test voltage value is obtained on the test sample.

Case: For a 1km 110kV/1000mm2 cable with a capacitance of ≤ 0.265 μ F, the test frequency is 30-300Hz, and the test voltage is 128kV.

Test current I=2 π fCU Test=2 π × 35 × 0.265 × 10-6 × 128 × 103=7.5A

Corresponding inductance of reactor L=1/ω 2C=78H

If the reactor is designed as three sections and connected in parallel, the parameters of a single section reactor are 347kVA/130kV/2.6A/234H

List of usage relationships for frequency modulation series resonance test device during testing

The selection result of 1km of 110kV/1000mm2 cable is BPXZ-HT-1040kVA/130kV frequency modulation series resonance test device

Precautions for FM series resonance test device

When conducting resonance tests, one end of the adjustable inductance must be connected to the 3kV output terminal of the transformer (at this time, the 35kV terminal is unloaded).

2. The circuit should be reliably grounded.

When searching for the resonance point, it should be adjusted under low voltage to avoid generating excessive voltage on the test sample.

When the test sample experiences flashover or discharge, the voltage should be immediately reduced to zero and the power supply should be disconnected.

5. When making a voltage resistant wire rod, disconnect the 3kV output terminal of the transformer and directly connect the test sample to the 35kV output terminal of the transformer.