High Voltage DC Insulation Testers measure leakage current while applying a dc voltage at or above the insulation system’s operating level. This measurement aids in determining the insulation system’s ability to withstand overvoltages such as lightning strikes and switching surges.
Applications
Megger portable HV DC Insulation Testers check the electrical insulation quality of many types of insulation systems including, motors, power cables, switchgear, insulators, transformers, capacitors, etc. Typical applications include acceptance and maintenance testing of critical equipment used in electrical utility substations, industrial plant distribution systems, and harsh military environments. Power apparatus manufacturers may also use the equipment to perform QA/QC production tests.
The MIT30 can be used to perform step-voltage and proof tests which, when incorporated into a routine maintenance program, can aid in predicting potential failure before breakdown occurs.
DC vs AC High-Potential Testing
Direct current high-potential testing provides several advantages over alternating current. Direct current test equipment uses far less power, provides fast charging of highly capacitive test samples, can be easily transported to the test site and costs less.
Safety and Reliability
- Fail-Safe, gravitationally invariant internal grounding switch
- Zero-Start safety provision
- Cable interlock with bright LED, visible even in direct sunlight
- Triaxial HV output cable, with integrated –HV, Guard, and current sense
- Detachable HV output cable, shielded with interlock provision
- Output current overload relay
- Switch control and indicating lights for high-voltage ON/OFF
- Protected output for both short/open circuit conditions
- Fused power inlet module