Column Control DTX

HV Cable Insulation Resistance Testing for Hybrid Vehicles

Application Notes


Hybrid vehicle technology has grown rapidly over the last decade because of its fuel efficiency and low emissions. Today’s hybrid systems are more sophisticated than conventional engines and leverage the best operating characteristics of the combustion engine and electric motor based on driving conditions. This helps to achieve superior fuel efficiency and reduce CO2 emissions.

An Overview of Critical Hybrid Connections

Conventional engine vehicles operate between 12 to 14 V to activate the combustion engine. The use of hybrid technology adds a high-voltage system and expands the operating voltage to as high as 650 V to power the electric motor in the hybrid vehicle. The high-voltage (HV) system includes the HV battery, inverter assembly, and the motor generators. These elements are connected using an HV power cable, which is color-coded in orange to easily distinguish it from regular cables. An insulation resistance test is performed to check the integrity of the HV power cable between the HV battery and the inverter system, and between the inverter and motor generator.


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Column Control DTX