1、 Product Overview:

The variable frequency series resonant withstand voltage device forms a series circuit (L) through an excitation transformer reactor, and then connects in parallel with the test sample (C) to form a resonant circuit. By adjusting the frequency of the test power supply, the circuit inductance L resonates with the test sample capacitance C to obtain high voltage.

The variable frequency series resonant withstand voltage device is suitable for various occasions that require AC withstand voltage. It can meet the withstand voltage requirements of high voltage and large capacity products as well as small capacity and high voltage.

Reference standard: GB50150DL/T 474.4-2006 DL/T 596-2005 DL/T849.6-2004.

The variable frequency series resonant withstand voltage device consists of a variable frequency control unit, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor. By changing the series parallel connection of the reactor, it can be applied to different situations.

Widely used in industries such as power, railway electrification, steel, machinery, metallurgy, petroleum, chemical, etc., it is suitable for AC withstand voltage testing of high voltage and large capacity capacitive specimens.

The frequency conversion series resonant withstand voltage device is also applied to the AC withstand voltage test of 10kV, 35kV, 110kV, 220kV, and 500kV polyethylene power cables; Suitable for AC withstand voltage test of 60kV, 220kV, 500kV GIS. Suitable for power frequency withstand voltage testing of large transformer generator sets.

2、 Main features:

1. The required power capacity is greatly reduced. Series resonant power supply utilizes resonant reactors and the capacitance of the test object to generate high voltage and high current through resonance. In the entire system, the power supply only needs to provide the active consumption part of the system, so 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 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, which is generally 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 and obtain a good sine waveform, effectively preventing harmonic peaks from causing false breakdown of the test sample.

4. Prevent large short-circuit currents from burning the fault point. When the weak point of the insulation of the test sample is broken down in the series resonance state, the circuit immediately loses resonance and the circuit current rapidly drops to 1/Q of the normal test current. When conducting voltage withstand tests using parallel resonance or test transformer methods, the breakdown current immediately increases by several tens of times. Compared to the two, the short-circuit current and breakdown current differ by hundreds of times. So series resonance can effectively find the weak point of insulation without the hidden danger of large short-circuit current burning the fault point.

5. There will be no overvoltage recovery. When the sample breaks down, the high voltage disappears immediately due to the loss of resonance conditions, and the arc extinguishes immediately. The process of re establishing the recovery voltage is very long and 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.

• Delivery site of frequency conversion series resonance withstand voltage test device
• Variable frequency series resonant withstand voltage device shipped on 12.02
• Frequency conversion series resonance delivery site
• Series resonant withstand voltage equipment HZBP-DL series

The enterprise's products are strictly produced in accordance with international and national standards and industry regulations, and have passed the testing of national, provincial, and municipal power research institutes, measurement centers, and authoritative power departments. They have fully passed the ISO9001 international quality management system certification, the People's Republic of China manufacturing measuring instrument license, the GB/T19001-2008 quality management system requirements, the GB/T24001-2004 environmental management system requirements, and the GB/T28001-2011 occupational health and safety management system requirements.

We will strictly follow the "Quality and After sales Service Commitment Letter" to provide relevant product services, and we firmly believe that high-quality, systematic, comprehensive, and fast services are the foundation of enterprise development. After years of continuous exploration and progress, we have formed the service philosophy of 'customer centricity, quality as the first life of the enterprise'. And with the goal of creating a first-class service enterprise in China through strict quality management and advanced technology, we have formulated a quality policy of 'standardized management system, strict process control to ensure product quality and customer satisfaction'. For many years, we have adhered to the principle of 'customer first' and built a good sales and after-sales service system to provide customers with better pre-sales, in sales, and after-sales services!

Our after-sales service commitment is: 'Refund within 3 months, replacement within 1 year, free repair for 3 years, and lifelong maintenance'. In the days to come, we will continue to adhere to the three-star service as always!

Note: The detailed product information is subject to the actual product. Please confirm the specific model parameters with the sales personnel before purchasing. Please refer to the instruction manual.

The final interpretation of this service commitment belongs to Wuhan Hezhong Electrical Equipment Manufacturing Co., Ltd.

If you have any questions.