Ultra-low frequency high voltage generator dielectric strength test is essentially an alternative frequency voltage withstand test. We know that when large generators, cables and other test items were frequency voltage withstand test, because of their insulating layer exhibits a large capacity, it is necessary to test large-capacity transformer or resonant transformer. Such a huge number of devices, not only bulky, high cost, and very inconvenient. To solve this problem, the power sector to reduce the use of the test frequency, thereby reducing the capacity of the test supply. From home and abroad for many years of theory and practice has proved that with 0.1Hz ultra-low frequency voltage test alternative frequency voltage withstand test, not only have the same equivalence, and the volume of the device is greatly reduced, greatly reduced weight, theoretical capacity frequency of about one five-hundredth. Greatly simplify test procedures, and more advantages compared to test frequency. That is why developed countries are using this method causes. Ministry of Wuhan High Voltage Research Institute has commissioned the drafting of "35kV and below XLPE insulated power cable ultra-low frequency (0.1Hz) pressure test methods" industry standard. Our country is promoting this approach, the instrument is made in accordance with the development of this need. It can be widely used among the AC voltage test cables, large high-voltage rotating motors, power capacitors.

After Wuhan Guo Ding Technology Co., long-term pressure test, AC voltage test, DC voltage test, study shows: ultra-low frequency high voltage generator can replace the transformer test, DC high voltage generator, so it is his series resonance test. 0.1HZ voltage insulation defects detected slightly more effective than the DC voltage and slightly inferior to 50HZ AC voltage! Therefore, some plants pressure test, first do 0.1HZ ultra-low frequency voltage test, then the DC voltage test and 50HZ AC voltage test.

Ultra-low frequency high voltage generator combines advanced modern digital inverter technology, using computer control, boost, buck, measurement, protection is fully automated and automatic step-up process can be manual intervention. Since the all-electronic, so small size, light weight, large-screen liquid crystal display, clear and intuitive, printer output test report. In full compliance with design specifications "special test equipment electrical equipment general technical conditions, Part 4: ultra-low frequency high voltage generator General technical conditions" power industry standard, easy to use. Now at home and abroad are using a mechanical approach to produce ultra-low frequency modulation and demodulation signal, there is no standard sine wave, the measurement error is large, high-pressure part of a spark discharge, heavy equipment, and the sine wave second and fourth quadrants need High-power high-pressure discharge resistors shaping, so the larger the overall power consumption of the device.
GDGY-8809 ultra-low frequency high voltage generator Features:
1, current and voltage data are sampled directly through the high side, so the data true and accurate.
2, over-voltage protection: When the value of the output voltage exceeds the limit set, the instrument will shut down to protect the operating time of less than 20ms.
3, over-current protection: designed for high and low voltage dual protection, high-pressure side can be accurately set value shutdown protection; current low voltage side will be shutdown protection than the rated current, the operation time is less than 20ms.
4, the high-voltage output protection resistor design in boosting the body, so the outside does not need another connection protection resistor.
5, the use of high and low pressure closed-loop negative feedback control circuit, the output rise in no effect.

GDGY-8809 ultra-low frequency high voltage generator technical parameters:

model	Rated voltage	Load capacity	Power Fuse	weight	use
GDGY8809-30/1.1	30kV	0.1Hz,≤1.1µF	10A	Controller：4㎏ Boost body：25㎏	10kV Cables, generators
		0.05Hz,≤2.2µF
		0.02Hz,≤5.5µF
GDGY8809-50/5	50kV	0.1Hz,≤5µF	55A	Controller：5㎏ Boost body：55㎏	Burn for cable fault
		0.05Hz,≤10µF
		0.02Hz,≤25µF
GDGY8809-80/1.1	80kV	0.1Hz,≤1.1µF	30A	Controller：5㎏ Boost body：45㎏	35kV Cables, generators
		0.05Hz,≤2.2µF
		0.02Hz,≤5.5µF

 
 

GDGY-8809 ultra-low frequency high voltage generator for large generators, cables, and other test items were frequency voltage withstand test or leakage current test