Series Resonant Test Set

MOEORW-W5606 Series Resonant Test Set

MOEORW-W5606 108kVA/108kV AC Resonant Test System, rated at 108kVA/108kV, frequency adjustable from 30 to 300Hz, waveform distortion rate <1.0%, measurement accuracy 1.5%, device quality factor Q≥30.

It is suitable for withstand voltage tests of 10/35kV cables, main transformers, switch transformers, etc., supports multiple working modes, is equipped with multiple protections such as overvoltage and overcurrent, and can store and print test data, making it the preferred equipment for power testing.

AC Resonant Test System This device is primarily designed and manufactured for AC withstand voltage testing of 10kV and 35kV cables ; switches and transformers at voltage levels of 10kV, 35kV and below ; and 10kV and 35kV main transformers . The reactors are designed in multiple separate units, which can meet the testing requirements of high-voltage, low-current equipment as well as the AC withstand voltage testing requirements of low-voltage equipment such as 10kV cables. It has a wide range of applications and is an ideal withstand voltage testing device for high-voltage testing departments at the prefecture, city, and county levels, as well as power installation and maintenance engineering units.

The device mainly consists of a frequency converter control power supply, an excitation transformer, a reactor, a capacitor divider , and a compensation capacitor .

Advantages of series resonance in power systems:

1. The required power supply capacity is greatly reduced. The series resonant power supply uses the resonance of the resonant reactor and the capacitor of the test object to generate high voltage and large current. In the whole system, the power supply only needs to provide the active power consumption part of the system. Therefore, the power 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 are bulky high-power voltage regulating devices and ordinary high-power power frequency test transformers eliminated, but the resonant excitation power supply only needs 1/Q of the test capacity, which greatly reduces the weight and volume of the system, generally to 1/10 of ordinary test equipment.

3. Improves the waveform of the output voltage. The resonant power supply is a resonant filter circuit that can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent harmonic peaks from causing false breakdown of the test sample.

4. Prevents large short-circuit currents from burning out fault points. In series resonance, when the insulation weakness of the test specimen is broken down, the circuit immediately detunes, and the loop current rapidly drops to 1/Q of the normal test current. However, in parallel resonance or withstand voltage testing using a test transformer, the breakdown current immediately increases by tens of times. Compared to parallel resonance, the breakdown current differs by hundreds of times. Therefore, series resonance can effectively locate insulation weaknesses without the risk of large short-circuit currents burning out fault points.

5. No recovery overvoltage will occur. When the test sample breaks down, the high voltage disappears immediately due to the loss of resonance conditions, the arc is extinguished instantly, and the re-establishment process of the recovery voltage is very long. It is easy to disconnect the power supply before the flashover voltage is reached again. This voltage recovery process is an intermittent oscillation process of energy accumulation. The process is long, and no recovery overvoltage will occur.

(a) MOEORW - refers to the manufacturer's code

108 refers to the maximum rated capacity that the equipment can output, measured in kVA.

108 refers to the voltage level that the equipment can output, in kV;

(ii) MOEORW-XB566 (108kVA-108kV) Technical Specifications of Variable Frequency Series Resonant Withstand Voltage Test Device

Rated voltage

22kV---Meets the AC withstand voltage test requirements for 2km of 10kV/300mm2 cable, with a capacitance ≤0.751uF, test frequency 30-300Hz, test voltage 22kV, and test time 5min;

52kV---Meets the AC withstand voltage test requirements for 0.5km of 35kV/300mm2 cable, with a capacitance ≤0.097uF, test frequency 30-300Hz, test voltage 52kV, and operating time 60min;

95kV --- Meets the AC withstand voltage test requirements for switches and transformers with voltage levels of 35kV and below. The test frequency is 30-300Hz, the test voltage does not exceed 95kV, and the test time is 1min.

42kV --- Meets the AC withstand voltage test requirements for switches and transformers with voltage levels of 10kV and below; test frequency 30-300Hz, test voltage not exceeding 42kV, test time 1min;

35kV---Meets the AC withstand voltage test requirements of a 10kV/20000kVA main transformer, with a capacitance ≤0.01uF, test frequency 45-65Hz, test voltage 35kV, and test time 1min;

68kV --- Meets the AC withstand voltage test requirements of a 35kV/31500kVA main transformer, with a capacitance ≤0.01uF, test frequency 45-65Hz, test voltage 68kV, and test time 1min.

2. Output voltage waveform distortion rate: <1.0%

3. Permissible continuous working time: 60 minutes of continuous operation under rated conditions;

4. Device quality factor: Q≥30 (f=45Hz)

5. Device output waveform: sine wave

6. Input power: Three-phase 380V or single-phase 220V

7. Frequency adjustment range: 30Hz～300Hz

8. System measurement accuracy: 1.5%

9. The device has overvoltage, overcurrent, and zero-position start protection functions.

(iii) Equipment conforms to standards

Standard for Acceptance Testing of Electrical Equipment in Electrical Installation Engineering (GB50150-2016)

High Voltage Resonance Test Apparatus DL/T 849.6-2004

Reactors GB10229.88

Preventive Testing Procedures for Electrical Equipment (DL/T596-1996)

Coupling capacitors and capacitive voltage dividers, IEC 358 (1990)

(iv) Description of main equipment configuration and technical parameters