1、 Overview

The high-voltage withstand voltage test of electrical equipment is one of the most important items specified in the "Insulation Preventive Test". Voltage withstand test can be divided into AC voltage withstand test and DC voltage withstand test, and AC voltage withstand test can be further divided into power frequency and transformer voltage withstand test

Frequency and 0.1Hz ultra-low frequency dielectric loss testing technology, among which 0.1Hz ultra-low frequency dielectric loss technology is the latest technology recommended by the International Electrotechnical Commission. Our company's new generation ultra-low frequency dielectric loss high voltage generator series is a core product independently developed using the latest American technology. It features a 7-inch touch screen, the latest ARM7 microcontroller, high-speed AD acquisition circuit, and is equipped with backend management software. It overcomes many shortcomings of similar domestic products and has a much higher cost-effectiveness than similar imported products. It is particularly suitable for withstand voltage testing of electrical equipment with high insulation equivalent capacitance (such as power cables, power capacitors, large and medium-sized generators, and motors), and meets the requirements of the newly issued national power industry standard "General Technical Conditions for Ultra Low Frequency High Voltage Generators DL/T849.4-2004" in 2004.

2、 Advantages of 0.1Hz ultra-low frequency dielectric loss withstand voltage technology

The ultra-low frequency insulation withstand voltage test is actually an alternative method to the power frequency withstand voltage test. When conducting power frequency withstand voltage tests on large and medium-sized generators, motors, power cables, and other test samples, their insulation layers exhibit

Due to its large capacitance, a large capacity test transformer or resonant transformer is required. These huge devices are not only bulky and expensive, but also very inconvenient to use. In order to solve this contradiction, the international community generally adopts the method of reducing the test frequency, thereby reducing the capacity of the test power supply. From years of theoretical and practical experience both domestically and internationally, it has been proven that replacing the power frequency withstand voltage test with a 0.1Hz ultra-low frequency withstand voltage test not only achieves the same equivalence, but also greatly reduces the size and weight of the equipment. In theory, the capacity is about one fifth of the power frequency, and the operation is simple. This is the main reason why developed countries commonly adopt this method. According to the actual situation of China's power system, the National Development and Reform Commission has formulated the industry standard "Ultra low frequency (0.1Hz) withstand voltage test method for 35kV and below cross-linked polyethylene insulated power cables", and issued it in 2004

The industry standard "General Technical Conditions for Ultra Low Frequency High Voltage Generators DL/T 849.4-2004" is being promoted in China as the latest testing method.

Although DC withstand voltage testing equipment has the advantages of small size, light weight, and low cost, DC withstand voltage testing also has the greatest damage to the insulation of the tested object. Therefore, the latest regulations on preventive testing of electrical equipment issued by the country have explicitly stipulated that DC high voltage will no longer be used for voltage withstand testing of electrical equipment, and AC voltage withstand testing is recommended. The new generation of 0.1Hz ultra-low frequency high-voltage generator developed by our company adopts the latest electric technology

Power electronic components and the latest ARM7 microcontroller technology have further reduced the size and weight of the equipment, with a foolproof operation and more stable performance, overcoming the short service life, high failure rate, and large size of the first generation mechanical booster

The major drawback. Through years of practice, feedback from a large number of users has shown that this series of ultra-low frequency high-voltage technology is leading in the country and has the highest cost-effectiveness!

Technical parameters of this series of products

1. Voltage (peak) 30kV, sensitivity: 0.1kV, accuracy: 1%

2. Waveform: ultra-low frequency sine wave, DC voltage, positive and negative peak voltage error: ≤ 3%, voltage waveform distortion: ≤ 1%

3. Frequency range: 0.1 Hz 0.05 Hz 0.02 Hz Load range (ultra-low frequency test): 10nF -10 μ F

4. Current: Measurement range: 0-70 mA, sensitivity: 1 μ A, accuracy: 1%

5. Dielectric loss:

Ultra low frequency sine wave voltage range: 1-80 kVrms

Load range: 50nF-5 μ F

Resolution: not less than 1x10-6

Accuracy: not less than 1x10-3

Measurement range: 1x10-3-21000x10-3

Dielectric loss measurement frequency: 0.1Hz

Capacity range: 50nF-5 μ F

Resistance range: 30M Ω -10G Ω

Volume: 48cm * 28cm * 58cm

Weight: 45kg