Production of Variable Frequency Series Cable Voltage Test Device

The voltage withstand test equipment is a promoted product of Yangzhou Zhili Electric Technology Co., Ltd. After years of continuous production and improvement, it has become one of the most mature products in the power testing industry. This product is used in power plantsGong Electric Bureau andIn order to better serve the Chinese power industry, this catalog is compiled for the convenience of consumers to choose basic testing equipment used for voltage withstand testing by research institutions and other users.

For any series LC resonant circuit composed of a reactor (with inductance L) and a capacitor (with capacitance C), it has a fixed frequency f=1/2 π root LC, and when the frequency of the external power signal is equal to this frequency, the circuit will resonate. During resonance, the voltage obtained on the inductor and capacitor is the highest, and most of the tested samples can be equivalent to a capacitor. Based on this idea, a variable frequency transformer power supply with adjustable frequency and voltage is provided before the series resonant circuit. A voltage divider is connected in parallel at both ends of the capacitor for measurement and feedback, thus forming the device.

Variable frequency series cable voltage withstand test deviceProduct Technical Specifications:

1. Environmental temperature: -10 ℃~45 ℃

2. Working humidity: ≤ 90%

3. Altitude: ≤ 2000m

4. Power input: 380V ± 10% three-phase or 220V ± 10% single-phase (below 10kW), 50Hz

5. Rated test capacity: 0-10000kVA

6. Resonant voltage: 0-1000kV

7. Frequency adjustment range: 0.1-300Hz

8. System measurement accuracy: 0.5/1.0 level

9. Frequency adjustment resolution: 0.01Hz

10. Instability: ≤ 0.05%

11. Output waveform: sine wave

12. Waveform distortion rate: ≤ 0.5%

13. Noise: ≤ 60dB

14. Reactor Q value: 30-120

Variable frequency series cable voltage withstand test deviceComposition of complete equipment

1. Variable frequency voltage regulating power supply: It can change both the output frequency and the output voltage.

2. Excitation transformer: It plays a role in coupling signals and voltage conversion, and increases voltage according to its own transformation ratio.

3. Reactor: Connected in series with the test sample to form an LC circuit.

4. Voltage divider: used to measure the voltage on the test sample and provide feedback as a sampling signal to the instrument.

5. Compensation capacitor: used to adjust the frequency of the test sample.

Technical basis and reference execution standards

GB2900 "Terminology for Electricians"

GB10229-88 "Reactor"

DL/T596-1996 "Preventive Test Code for Power Equipment"

GB/T16927.1-2-1997 "High Voltage Test Techniques"

ZBK41006-89 "Test Transformer"

GB7328-87 "Sound Level Measurement of Transformers and Reactors"

IEC358 (1990) "Coupling capacitors and capacitive voltage dividers"

IEC1000 Electromagnetic Compatibility

GB4793-1984 Safety Requirements for Electronic Measuring Instruments

GB/T2423.8-1995 Basic environmental testing procedures for electrical and electronic products

GB1094-1-GB1094.6-96 "Degrees of Protection Provided by Enclosures"

GB/T3859.1-1993 Basic Requirements for Semiconductor Inverters

Guidelines for the Application of Semiconductor Inverters (GB/T3859.2-1993)

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