The Biddle (now Megger) 220070 is a highly dependable, portable 70 kV DC Dielectric Test Set (Hipot) used for evaluating the electrical insulation quality of high-voltage apparatus. It is designed to perform proof, acceptance, and maintenance testing on power cables, motors, switchgear, transformers, and insulators in both field and industrial settings.

Here are the key features of the equipment:

• Two-Module Design: Features a split-architecture design consisting of a lightweight Control Unit and a separate, air-insulated High-Voltage Module. This ensures maximum operator safety by keeping the control interface isolated from the high-voltage source.

• Voltage and Current Output: Delivers a continuously variable DC output up to 70 kV with a 5 mA capacity, allowing for the rapid charging of high-capacitance loads like long power cables.

   

• Advanced Rectification: Utilizes filtered half-wave rectification to provide the smooth, stable performance of a full-wave rectified unit, ensuring long-term reliability and precise testing.

   

• Internal Guard Circuit: Equipped with an internal guard circuit and a guard connection on the high-voltage output cable. This intercepts stray surface leakage currents that could interfere with the measurement, ensuring highly accurate data.

   

• Precision Metering: Features precise digital metering, including a bipolar ammeter that accurately displays the magnitude of both the leakage current during the test and the discharge current when the test concludes.

   

• Stringent Safety Systems: Incorporates essential safety mechanisms, including a zero-start interlock (the voltage dial must be at zero before powering up), an output current overload relay, full circuit-breaker protection, and connections for external safety interlocks.