Endurance testing of various electrical components (wires, stators, hairpins, switches, motors etc.) in liquid media (refrigerants, heat transfer fluids, etc.)

In most cases it is requested to simulate the behavior of specimen over the full lifetime cycle. Accelerated aging is applied to achieve results in a reasonable time. Increased temperatures, concentrations, voltages, shortened pulse raise times, mechanical stress and damages or partial discharges may be applied to accelerate aging processes of the electric component.

Electrical components in refrigeration circuits are exposed to rough conditions. Normal electrical stress is superimposed by pressure fluctuations, temperature cycles and chemical influences. Under these conditions they have to operate without a chance of maintenance for decades. Thermal and chemical aging of electrical components usually takes place in autoclaves. Temperatures up to 200 °C and pressure values up to 100 bar are feasible as well as defined temperature sweeps and pressure fluctuations. The test samples may be exposed to gaseous refrigerant atmospheres, pure liquid refrigerant, oil-refrigerant mixtures or any other substance to which their stability has to be tested. Test methods include microscopic examination, determining the service life of enamelled wire test specimens, partial discharge measurements, impulse voltage tests, breakdown tests and insulation resistance measurements. We develop procedures to address customer-specific requirements.