Describe the procedure for replacing a failed IGBT in a WEC power converter.

The procedure for replacing a failed Insulated Gate Bipolar Transistor (IGBT) in a Wave Energy Converter (WEC) power converter requires careful steps to ensure safety and proper operation. First, de-energize and isolate the power converter. Follow Lockout/Tagout (LOTO) procedures to prevent accidental re-energization. Verify the absence of voltage using a calibrated voltmeter. Second, allow sufficient time for capacitors within the converter to discharge completely. Use appropriate discharge tools if necessary. Third, document the existing IGBT's part number and location within the converter. Take photographs of the wiring configuration to aid in reassembly. Fourth, disconnect all wiring connected to the failed IGBT. Use insulated tools to prevent short circuits. Fifth, carefully remove the failed IGBT from its mounting. This may involve unscrewing it from a heat sink or releasing clips. Note the type and amount of thermal interface material (TIM) used between the IGBT and the heat sink. Sixth, clean the heat sink surface thoroughly, removing any old TIM. Seventh, apply a new, even layer of TIM to the heat sink surface. Use the same type and amount of TIM as originally used. Eighth, install the new IGBT onto the heat sink, ensuring proper alignment and orientation. Tighten the mounting screws to the manufacturer's specified torque. Ninth, reconnect all wiring to the new IGBT, following the documented wiring configuration. Verify the connections are secure and properly insulated. Tenth, visually inspect the installation to ensure that all connections are correct and that there are no loose wires or other potential problems. Eleventh, before re-energizing the converter, perform a low-voltage insulation test to verify that there are no short circuits. Finally, re-energize the power converter and verify its proper operation. Monitor the temperature of the new IGBT to ensure that it is operating within its specified limits.