75kVA–75 kV Variable-Frequency Series Resonance: Key Applications; Goldhome Hipot Supports High-Voltage Testing Across Multiple Industries
The 75-75 Variable Frequency Series Resonance (75kVA/75kV) system is a core piece of equipment for AC withstand voltage testing of capacitive devices in the medium- and high-voltage power industry. With its compact size, stable voltage rise, safety and reliability, and strong adaptability, it is widely used in scenarios such as power grid operation and maintenance, power engineering, industrial and mining enterprises, and new energy power plants.
In terms of practical applications, the 75-75 Series Resonance system is primarily used in four core scenarios.
First is high-voltage cable withstand voltage testing, which supports acceptance and preventive testing for 10kV and 35kV cross-linked cables. It can test 10kV cables up to 1.5 km in length and 35kV cables up to 0.35 km, with test voltages ranging from 22–52 kV, enabling precise detection of potential cable insulation damage, moisture ingress, and aging issues.
Second is distribution transformer insulation testing, suitable for withstand voltage testing of main transformer windings up to 35 kV. It applies a maximum test voltage of 68 kV to verify the insulation strength between windings and ground, as well as between phases, and is commonly used for equipment acceptance at power plants and substations.
Third is testing for switches, GIS, and transformers, used for withstand voltage testing of circuit breakers, isolating switches, and CT/PT transformers. This verifies the insulation performance of porcelain bushings and arc chambers, ensuring the safe operation of switchgear and gas-insulated switchgear (GIS).
Fourth is testing for industrial, mining, and new energy projects, serving mines, photovoltaic, and wind power plants. It conducts on-site withstand voltage tests on high-voltage equipment within these facilities and is suitable for remote areas and complex outdoor operating environments.
Regarding equipment performance-a top priority for customers-the Goldhome Hipot 75-75 Resonant Unit delivers practical, real-world test parameters. The unit operates at an output frequency of 30–300 Hz, with a waveform distortion rate of <0.5% and a stable quality factor (Q) of over 30; It can operate continuously at full load for 60 minutes, with voltage measurement accuracy of Class 0.5. It supports three modes-fully automatic, manual, and semi-automatic-and provides smooth voltage ramp-up without surges. The reactor is manufactured using an integrated casting process, offering moisture and dust resistance. It operates stably within a temperature range of -10°C to 45°C and at altitudes up to 2,000 meters, making it suitable for high-temperature, dusty, and high-humidity overseas working conditions.
As a direct manufacturer, all Goldhome Hipot 75–75 series resonant test sets undergo high-voltage aging, accuracy calibration, and stability testing before shipment. The products have been exported in bulk to numerous countries worldwide. With their cost-effectiveness, durability, reliability, and comprehensive service support, these devices have become the preferred choice for power engineering companies, third-party testing agencies, and overseas power plants. Moving forward, Goldhome Hipot will continue to optimize product adaptability to provide stable testing equipment support for high-voltage insulation testing worldwide.
