En comparación con las pruebas de tensión continua y las pruebas de tensión alterna de frecuencia de red, las pruebas VLF ofrecen ventajas únicas:
1. Comparado con la prueba de resistencia a corriente continua:
Better simulates operating conditions: Power equipment operates under AC voltage, and the electric field distribution under DC voltage differs from that under AC voltage. For solid-insulation equipment like XLPE cables, DC testing can create space charges within the insulation, potentially damaging it or masking underlying insulation defects. The electric field distribution under VLF AC voltage is consistent with the power frequency and does not cause space charge accumulation, making it a more effective and safer test method.Mejor para detectar defectos concentrados: los defectos como las descargas parciales se detectan más fácilmente bajo tensión de corriente alterna.
2. Comparado con la prueba de resistencia a la corriente alterna de frecuencia de potencia:
Portable equipment: As mentioned, the test current is drastically reduced, making the test equipment dozens of times lighter and smaller than power-frequency test sets, making it highly suitable for field use.Low power supply requirements: Requires very little capacity from the field power series resonance.Generadores de alta tensión VLF