Variable Inductance AC Resonant Test Systems| Detailed introduction of technical principles

The core principle of an AC resonant test system is to generate high voltage using series resonance.

Its operation is typically variable frequency resonance: the system consists of a variable frequency power supply, an excitation transformer, a fixed reactor, and a test specimen (equivalent capacitance) connected in series. By adjusting the output frequency of the variable frequency power supply (e.g., 30-300Hz), it is made equal to the natural resonant frequency of the entire LC circuit. At this point, the inductive and capacitive reactances cancel each other out, the total impedance is minimized, and the circuit becomes purely resistive, while the circuit current reaches its maximum.

In the resonant state, the voltages across the reactor and the test specimen are equal in magnitude and opposite in direction. The superposition of these two voltages on the test specimen generates a high voltage that meets the test requirements. This voltage is a power frequency (or near-power frequency) sine wave. The significant advantage of this principle is that the power supply only needs to provide a small amount of active power to compensate for circuit losses, thus enabling efficient AC withstand voltage tests on large-capacity test specimens such as cables and GIS using a small-capacity power supply and relatively lightweight equipment. Variable Inductance AC Resonant Test System, Resonant AC Test System, AC Resonant Test System (Variable Inductance) 270kVA 270kV 30-300Hz. This AC resonant test system is mainly used for AC withstand voltage tests of 35kV and 110kV cables, 110kV main transformers, GIS, and circuit breakers.

It has a wide range of applications and is an ideal withstand voltage test device for municipal, county, and prefecture-level high-voltage testing departments and power installation and maintenance engineering units.

The device mainly consists of a frequency converter, excitation transformer, reactor, capacitive voltage divider, and compensation capacitors.

1. 0.5km of 110kV/300mm² cable, capacitance ≤0.0735μF, test frequency 30-300Hz, test voltage 128kV, test time 60min

2. 2km of 35kV/300mm² cable, capacitance ≤0.389μF, test frequency 30-300Hz, test voltage 52kV, test time 60min

3. 5km of 10kV/300mm² cable, capacitance ≤1.88μF, test frequency 30-300Hz, test voltage 22kV, test time 60min

4. 110kV 1. For GIS and switchgear substation equipment with voltage levels of 35kV and below, the test frequency is 30-300Hz, the test voltage is 265kV, and the test time is 1min.

2. For GIS and switchgear substation equipment with voltage levels of 35kV and below, the test frequency is 45-65Hz, the test voltage is 52kV, and the test time is 1min.

3. For GIS and switchgear substation equipment with voltage levels of 35kV and below, the test frequency is 30-300Hz, the test voltage is 95kV, and the test time is 1min.

4. It has overvoltage, overcurrent, zero-position start, and system detuning (flashover) protection functions.

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

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

7. Data storage and printing: The stored data is numbered for easy user identification and retrieval. 5. The starting frequency for automatic frequency sweeping can be set arbitrarily within a specified range.

6. DSP platform technology allows for adding or removing functions and upgrades 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.

AC Resonance Test System, High Voltage Resonance Test System, AC Resonance Test Instrument

MSXB-F-270kVA 270kV Variable Inductance AC Resonance Test System, Resonance AC Test System, AC Resonance Test System (Variable Inductance)