AC voltage tester? Wuhan UHV specializes in producing AC voltage withstand testers with a wide range of product options. When looking for an AC voltage withstand tester, choose Wuhan UHV.         

The AC voltage withstand tester is mainly designed and manufactured for the AC voltage withstand test of all electrical main equipment such as 10kV, 35kV cables, generators, 110kV and below power main transformers, bus switches, etc. The reactor adopts multiple separate designs, which can meet the requirements of high voltage and low current equipment testing conditions, as well as the requirements of low voltage AC withstand voltage testing such as 10kV cables. 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 prefecture, city, and county levels. The device mainly consists of a variable frequency power supply, an excitation transformer, a reactor, and a capacitive voltage divider.

Advantages of using AC voltage withstand tester in power system:

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 weight and volume of the system, usually 1/10-1/30 of the ordinary test device.  

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 concern 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.

Characteristics of AC Voltage Tester:

1. Reactors of the same voltage level and capacity have smaller volume and lighter weight; Low temperature rise at rated load; Adopting dry epoxy casting, with high mechanical strength, good electrical insulation performance, beautiful and reliable appearance;

2. The variable frequency power supply control box has a large capacity margin; Strong protection function; Good output waveform; Good stability; Having multiple working modes and easy operation; Single phase 220V or three-phase 380V input power supply is universal, convenient for on-site power supply;  

3. Flexible configuration. Different types of reactors can be selected to meet the requirements of different test samples, achieving multi use and high cost-effectiveness.         

According to the requirements of the voltage withstand test regulations for primary electrical equipment in substations of 220V and below, the corresponding AC/DC voltage withstand test equipment must meet both high voltage and low current test conditions, as well as low voltage and high current test conditions. It is required to have a wide range of applicability and adopt the principle of series resonance. The main equipment consists of a variable frequency power supply control box (console), an excitation transformer, a reactor, and a capacitive voltage divider. The DC voltage withstand test can be completed by connecting a rectifier silicon stack and a microampere meter to the capacitive voltage divider. Due to its excellent filtering characteristics after resonance, the DC voltage produced by the system is superior to the DC voltage rectified by ordinary test transformers. It is an ideal high-voltage testing equipment for local, municipal, and county-level high-voltage testing departments, as well as power installation, repair, and testing engineering units.