is a high-voltage equipment specifically designed for insulation withstand voltage testing of cables, especially long-distance power cables



A Very Low Frequency High Voltage Generator (VLF HV Generator) is a high-voltage equipment specifically designed for insulation withstand voltage testing of cables (especially long-distance power cables). The voltage frequency it generates is typically 0.1Hz (also 0.05Hz or 0.02Hz), which is much lower than the power frequency (50Hz/60Hz). This equipment solves the problem that traditional power frequency withstand voltage testing cannot "drive" long cables, and is currently the mainstream equipment for cable acceptance and preventive testing in the power industry. The following is an in-depth analysis of this equipment: 1. Core Principle: Why use "very low frequency"? This involves the capacitance characteristics of cables. Cables are large capacitive loads: power cables are equivalent to a huge cylindrical capacitor. The longer the length, the larger the capacitance