Cable voltage resistant series resonant device

Cable voltage resistant 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.

Cable voltage resistant 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

Technical specifications

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.

Product Video Product Atlas

Product Attachment Diagram

the whole set

Incentive Transformer

Variable Frequency Power Supply

reactor

compensation capacitor

Voltage divider

Voltage divider signal line

power cord

Reactor series parallel line

Reactor series parallel line

Variable frequency source output line

High voltage output line

Incentive variable output line

ground wire

Specialized testing line crocodile clip

Specialized testing line pliers

USB drive

Product detail images

Incentive Transformer

Incentive Transformer Panel

Excitation transformer input

Excitation transformer terminal

Variable Frequency Power Supply

Variable frequency power supply display screen

Variable frequency power input

Variable frequency power supply grounding

Variable frequency power printer

Variable frequency power supply USB interface

Variable frequency power switch

Voltage divider base