Cable voltage withstand test device

NegotiableUpdate on 05/06

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The UHV series cable AC withstand voltage series resonant device has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The entire device is lightweight and easy to use on site, using DSP platform technology

Product Details

　　UHV series cable AC withstand voltage series resonant deviceMainly designed for AC withstand voltage testing of cross-linked cables, hydroelectric generators, main transformers, busbars, GIS, etc., it has a wide range of applications and is an ideal withstand voltage equipment for high-voltage testing departments and power installation and maintenance engineering units at the local, municipal, and county levels.

　　UHV series cable AC withstand voltage series resonant deviceMainly composed of variable frequency control power supply, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor (optional).

The advantages of series resonance in power systems

1. The required power capacity is greatly reduced. Series resonant power supply generates high voltage and high current through resonance between resonant reactor and the tested capacitor. In the entire system, the power supply only needs to provide the active consumption part of the system. Therefore, the required power supply for the experiment is only 1/Q of the test capacity.

2. The weight and volume of the equipment have been greatly reduced. In a series resonant power supply, not only is the bulky high-power voltage regulating device and ordinary high-power power frequency test transformer eliminated, but the resonant excitation power supply only requires 1/Q of the test capacity, greatly reducing the system weight and volume, usually 1/10-1/30 of ordinary test devices.

3. Improve the waveform of the output voltage. A resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the accidental breakdown of the test sample by harmonic peaks.

4. Prevent large short-circuit currents from burning the fault point. In the series resonance state, when the weak point of the insulation of the test sample is broken down, the circuit immediately disengages and the loop current rapidly drops to 1/Q of the normal test current. However, when conducting voltage withstand tests in parallel resonance or test transformer mode, the breakdown current immediately increases by several tens of times. Compared with the two, the short-circuit current is hundreds of times different from the breakdown current. So, series resonance can effectively identify insulation weaknesses without the risk of large short-circuit currents burning the fault point.

5. There will be no overvoltage recovery. When the test sample breaks down, due to the loss of resonance conditions, the high voltage immediately disappears, the arc immediately extinguishes, and the process of re establishing the recovery voltage is long. It is easy to disconnect the power supply before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and does not result in any recovery overvoltage.

Product Name: Series Resonance, Variable Frequency Resonance, Variable Frequency Series Resonance, Series Resonance Test Equipment, Series Resonance Voltage Endurance Device, Cable Voltage Endurance Series Resonance Device

technical parameters

Rated output voltage	0-220kV (AC RMS) and below
output frequency	30～300Hz
Resonant voltage waveform	Pure sine wave, waveform distortion rate ≤ 1.0%
Full load working time	Continuous working time of 60 minutes
System quality factors	Under load ≥ 20
Frequency regulation fineness	0.1Hz
instability	≤0.01%
working power supply	Single phase 220V or three-phase 380V ± 10%, power frequency 50Hz ± 5%

　
Note:

1. The appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice. If there is any act of theft or copying, legal responsibility will be pursued.

2. For more information on ultra-high voltage products, please enter the product center.

Product features

1. Cables with voltage levels of 35kV and below are widely used and require a large amount of testing work. Therefore, this type of voltage withstand test device is small in size and light in weight, giving rise to portable cable voltage withstand test systems.

2. This system requires that the weight of components that can be moved on-site by a single person should not exceed 30kg, and the weight of components that can be moved on-site by two people should not exceed 60kg, which is suitable for on-site handling.

3. The power supply adopts 220V single-phase power supply or 380V three-phase power supply, which is convenient for on-site power supply.

4. The reactor part adopts dry-type epoxy casting, which is beautiful and reliable, suitable for the requirements of various types of cables.

5. Oil immersed reactors are used for the withstand voltage test of cables with voltage levels of 110kV and above. When the individual weight exceeds 100kg, our company's dedicated small electric crane can be optionally equipped.

6. The operation interface supports language switching function and can freely switch between multiple languages simultaneously. The default is to switch between Chinese and English, and other languages can be customized.

7. The system has a built-in series resonance parameter calculator, which can quickly calculate the inductance, capacitance, frequency, resonant high voltage current, and cable capacitance of series resonance with one click.