First, the scope of application

Inverter series resonant complete sets of test device is the principle of series resonance, the use of excitation transformer excitation series resonant circuit, by adjusting the output frequency of the inverter controller, so that the reactor reactor inductance L and test capacitor C series resonant resonance voltage Is the voltage applied to the test product. Frequency conversion resonant test device is widely used in electric power, metallurgy, petroleum, chemical and other industries, suitable for large capacity, high voltage capacitive test product transfer and preventive test.

Applicable to 10KV, 35KV, 110KV, 220KV, 500KV XLPE power cable AC voltage withstand test

Applicable to 66KV, 110KV, 220KV, 500KV, GIS AC voltage test

Applicable to large-scale generating units, power transformer power frequency withstand voltage

Applicable to induction voltage test of power transformer

Second, the main performance indicators and characteristics

Main technical indicators

(1) Operating temperature range: -10 ~ 45 ℃

(2) Operating humidity range: ≤ 90%

(3) elevation: ≤ 1000m

(4) Power supply voltage: 380V ± 10%, three phase or 220V ± 10%, single phase (10KW and below) 50 / 60Hz

(5) power supply capacity: 0-300KW

(6) Rated output voltage: 0-1000KV

(7) Rated output capacity: 0-35MVA

(8) Operating frequency range: 30-300Hz (also according to user requirements to relax the frequency range)

(9) Frequency adjustment resolution: 0.02Hz; Instability ≤0.05%

(10) Noise: ≤ 60dB

(11) system measurement accuracy: 1 level

(12) Output waveform: sine wave, waveform distortion rate ≤ 1%

(13) Reactor Q: 30-120

(14) system with IGBT, over voltage, over current, flashover products such as automatic protection

2. 2 main features

2. 2. 1 small size, light weight, suitable for on-site use

The variable frequency controller set voltage regulator, frequency control, control and protection function as a whole, eliminating the need for bulky regulator, and easy to operate, intuitive readings due to the system Q value is higher (30-120), effectively solve the power The capacity of the lack of control of the field test.When the voltage level is high, the reactor with multi-level or stacked structure, easy to use the input and field installation.

2. 2. 2 installation of high reliability

The frequency conversion device adopts the advanced design idea, the high quality IGBT and the driving circuit make the output waveform distortion small, the frequency output stability is good, has the good IGBT, the overcurrent, the overvoltage (the protection value may according to the need human setting) and the discharge protection Function, can protect the equipment and personal safety; when the sample discharge or breakdown, due to the resonance conditions are destroyed, short circuit current is small, only test the test current 1 / Q, to avoid damage caused by the breakdown of the test The

2. 2. 3 The equivalence of the test is good

Using the AC voltage (30HZ-300HZ) as the test power, both in terms of equivalence and consistency are very close to 50Hz / 60HA power frequency power supply to ensure the reliability and authenticity of the test results.

The composition of the whole device: variable frequency power supply, excitation transformer, reactor, capacitor, voltage divider and other components