AC/DC Withstanding Voltage Tester| Detailed introduction of technical principles

The frequency resonance test system is a mainstream implementation method for series resonant withstand voltage testing. Its core principle is to fix the inductor and adjust the frequency to achieve resonance.

The system consists of a frequency converter, a fixed reactor, and the test specimen forming a series circuit. The test specimen is equivalent to a fixed capacitor. During testing, the inductance of the reactor remains constant, while the frequency converter (typically with an output frequency range of 30-300Hz) continuously adjusts the frequency of the output voltage.

When the output frequency of the power supply equals the inherent resonant frequency of the circuit determined by the fixed reactor and the capacitance of the test specimen, the system reaches a series resonance state. At this point, the inductive reactance of the reactor and the capacitive reactance of the test specimen cancel each other out, resulting in minimum circuit impedance and maximum current. Utilizing the resonant voltage boost effect, a high voltage much higher than the power supply output voltage can be obtained across the test specimen, thus enabling AC withstand voltage testing of large-capacitance test specimens such as cables and GIS with a relatively small power supply capacity. Its greatest advantage is the lightweight equipment (reactor) and its ease of flexible on-site assembly. AC/DC withstand voltage tester, AC withstand voltage tester, AC withstand voltage testing machine, AC withstand voltage tester 135kVA 108kV 30-300Hz frequency resonance test system. This device is mainly for AC withstand voltage testing of 10kV and 35kV cables, 35kV main transformers, and 35kV switches.

It has a wide range of applications and is an ideal withstand voltage equipment 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, excitation transformer, reactor, capacitive voltage divider, and compensation capacitors.

AC withstand voltage tests applicable to the following ranges:

1. 1 km of 35kV/300mm² cable, capacitance ≤0.1945uF, test frequency 30-300Hz, test voltage 52kV, test time 60min

2. AC withstand voltage test of 35kV main transformer, capacitance ≤0.015uF, test frequency 45~65Hz, test voltage 75kV, test time 1min

3. 3 km of 110kV/300mm² cable, capacitance ≤1.1265uF, test frequency 30-300Hz 1. Test voltage 17.4kV, test time 5min

2. 35kV switch and transformer AC withstand voltage test, test frequency 30-300Hz, test voltage 100kV, test time 1min

3. 10kV main transformer AC withstand voltage test, capacitance ≤0.015uF, test frequency 45~65Hz, test voltage 28kV, test time 1min

1. Equipped with overvoltage, overcurrent, zero-position start, and system detuning (flashover) protection functions.

2. Equipment weight and volume are 1/10-1/30 of ordinary testing equipment. The power required for testing is only 1 Ω of the test capacity.

3. The device has three working modes: fully automatic mode, manual mode, and automatic tuning manual boost mode.

4. Data storage and printing; the stored data number is numerical, which is convenient for users to identify and find.

5. The frequency starting point can be arbitrarily set within the specified range when the device automatically sweeps the frequency.

6. DSP platform technology: Functions can be added, removed, and upgraded according to user needs; the human-machine interface is more user-friendly.

7. Improved output voltage waveform.

8. Prevents large short-circuit currents from burning out fault points.

9. No recovery overvoltage will occur.

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