MSXZ (f) -75kVA/75kV resonance testing system: This device is mainly designed and manufactured for AC withstand voltage testing of 10kV and 35kV cables, 10kV and 35kV main transformers, and 35kV switches. It has a wide range of applications and is an ideal high-voltage testing equipment for local, municipal, and county-level high-voltage testing departments, as well as power installation and maintenance engineering units. The device mainly consists of a variable frequency power supply, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor.

1. 10kV/300mm² cable 1.5km, capacitance ≤ 0.563uF, test frequency 30-300Hz, test voltage 22kV, test time 5min

2. 35kV main transformer AC withstand voltage, capacitance ≤ 0.02uF, test frequency 45-65Hz, test voltage 68kV, test time 1min

Advantages of using resonance testing system in power system:

1. The required power capacity is greatly reduced. The power supply of the resonance testing system generates high voltage and high current through resonance between the 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 test is only 1/Q of the test capacity.

2. The weight and volume of the equipment have been greatly reduced. In the power supply of the resonance testing system, not only is the bulky high-power voltage regulating device and ordinary high-power power frequency test transformer eliminated, but the resonance 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 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 resonance testing system state, when the weak point of the insulation of the test sample is broken down, the circuit immediately becomes detuned, and the loop current rapidly drops to 1/Q of the normal test current. However, when parallel resonance or test transformer is used for withstand voltage testing, the breakdown current immediately increases by tens of times. Compared with the two, the short-circuit current is hundreds of times different from the breakdown current. So, the resonance testing system can effectively identify insulation weaknesses without the concern of large short-circuit current 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.

The main functions and technical features of our company's resonance testing system are:

1. The resonance testing system has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The overvoltage and overcurrent protection values can be set according to user needs. When the test sample flashover, the flashover protection action can be taken and the flashover voltage value can be recorded for experimental analysis.

2. The entire resonance testing system is lightweight and easy to use on site.

3. The resonance testing system has three working modes, which facilitate users to flexibly choose according to the on-site situation and improve the testing speed. The working modes are: fully automatic mode, manual mode, automatic tuning, and manual boost mode

4. It can store and print data in different locations, and the stored data numbers are numerical, making it convenient for users to identify and search.

5. When the resonance testing system automatically scans the frequency, the starting point of the frequency can be set arbitrarily within the specified range, and the scanning direction can be selected up or down. At the same time, the LCD screen displays the scanning curve, making it convenient for users to intuitively understand whether the resonance point has been found.

6. Adopting DSP platform technology, it is convenient to add or remove functions and upgrade according to user needs, making the human-machine exchange interface more user-friendly.