Huazheng Electric HZJC-900kV/67.6 kJ Lightning Impulse Voltage Generator For Transformer

1. Scope of application

This generator is used for the full-wave and cut wave tests of standard lightning impulse voltages for power transformers, transformers, reactors, lightning rods, switches, bushings, insulators and other test products with voltage classes of 20kV and below.

2. Conditions of use

Altitude：≤1000m

Environment temperature：-25℃～+45℃

Relative humidity：≤90%（at 20℃）

Maximum daily temperature difference：≤25℃

Anti-seismic ability：≤8 intensity

 The installation location：Indoor

The waveform of the power voltage is the actual sine wave

Waveform distortion rate <5%

3. Follow standards

GB / T 311.1 Insulation and coordination of high voltage transmission and transformation equipment

GB / T 16927.1 High voltage test technology Part I General test requirements

GB / T 16927.2 High-voltage test technology Part 2 Measurement system

GB / T 16896.1 Digital recorder for high voltage impact test

JB / T 7616 High-voltage line insulator withstand shock test

DL / T 557 high voltage line insulator steep wave impact test, definition, test method and criteria

ZBF 24001 detailed implementation of impulse voltage test

4. Rated parameter value

1. Nominal voltage: 900kV

2. Rated voltage: 150kV

3. Nominal energy: 67.6kJ

4. Total impact capacitance: 0.167 microfarad (single pulse capacitor 2.0 microfarad / 75 kV, 12 in total)

5, the total number of levels: 6

6. Standard waveform parameters:

(1) Full lightning surge voltage

Wave head time: 1.2us ± 30% uS, wave tail time: 50us ± 20%

Voltage utilization factor> 85% (greater than 90% at no load 300PF);

(2) Standard cut-off: cut-off time 2-6uS, zero-crossing coefficient ≤0.3%, voltage utilization coefficient> 85%

The impulse voltage waveform parameters and their deviations are in accordance with the requirements of relevant national GB311 and GB16927 standards.

7, the minimum output voltage is greater than 10% of the nominal voltage

8. Duration of use: Above 70% of rated voltage, continuous operation can be performed after charging and discharging every 120 seconds, and below 70% of rated voltage, continuous operation can be performed after charging and discharging every 60 seconds.