The Seba Dynatronic (SebaKMT, now part of the Megger Group) HSW 3-2 is an advanced, heavy-duty control unit that, when paired with the appropriate high-voltage transformer and rectifier modules (such as the HPG or HPA series), creates a powerful, two-piece AC/DC high-voltage test system (Hipot). In a 120 kV configuration, this robust system is specifically designed to perform highly accurate diagnostic withstand tests and verify the insulation integrity of high-voltage cables, switchgear, and substation components in demanding field and laboratory environments.

Here are the key features of the equipment:

• Two-Piece Architecture: Consists of the central HSW 3-2 control unit separated from the heavy, oil- or cast-resin-insulated high-voltage transformer. This modular design ensures maximum operator safety by allowing the control station to be operated at a safe distance from the high-voltage generation area.

• Dual AC/DC Output: Capable of functioning as both an AC test system (for testing switchgear, busbars, and low-capacitance plant equipment) and a high-power DC test system up to 120 kV (typically via a voltage doubler/rectifier attachment for cable testing).

• Precision Control & Metering: The HSW 3-2 features a continuously adjustable variac for smooth voltage application, alongside highly accurate, multi-range analog or digital meters to monitor both output voltage (kV) and leakage current (mA/µA).

• Programmable Timer: Includes a built-in test timer (typically 1–99 minutes) to strictly adhere to standardized step-voltage and maintenance test durations.

• Stringent Safety Mechanisms: Fully compliant with strict VDE safety standards. It includes a zero-voltage start interlock, fast-acting overcurrent protection, safety circuit indicator lamps, and compatibility with external discharge/earthing rods.

• High Power Capacity: Engineered to handle the rigorous demands of charging high-capacitance loads like long cable runs, offering sustained continuous operation and high short-time power ratings.