While T&R Test Equipment is a premier manufacturer of heavy-duty testing gear, their standard off-the-shelf AC high-voltage test series (the KV series) officially caps at 100 kV (the KV100-100 mk3). Requirements for 120 kV from T&R are typically fulfilled via custom builds, though the core design remains the same.

A high-capacity T&R AC High Voltage Test Set (in the 100 kV to 120 kV class) is a robust, high-power system designed to verify the dielectric strength and insulation integrity of high-voltage electrical plant equipment, such as switchgear, transformers, bushings, and insulators.

Here are the key features of this class of equipment:

• Two-Piece Architecture: Consists of a comprehensive control unit and a separate, oil-filled high-voltage transformer (often mounted on castors), ensuring the operator is safely distanced from the high-voltage source.

• Continuous Voltage Control: Provides a smoothly variable AC output voltage from zero up to the maximum rating, allowing for precise step-voltage and withstand testing.

• Adjustable Overcurrent Trip: Features a variable electronic trip circuit (typically adjustable between 10% and 110% of the rated output) to instantly disconnect power and protect both the test set and the asset in the event of an insulation breakdown.

• Comprehensive Metering: Equipped with accurate, dual-scale analog or digital meters to monitor both the applied output voltage (kV) and the resulting leakage current (mA) simultaneously.

   

• Strict Safety Interlocks: Incorporates critical safety systems, including a zero-start voltage interlock (requiring the control dial to be at zero before powering on), external interlock circuits for test enclosures, and an emergency stop button.

   

• Failure Indication: Provides immediate visual and audible alarms if the test piece fails the dielectric withstand test.