Current and Voltage Transformer Analyzer CVA500

Description

The new powerful DV Power CVA500 with a large 10.1-inch touch screen display represents an evolution testing technology that provides user-friendly and fast test execution of the full range of current transformer (CT), voltage transformer (VT), and capacitive voltage transformer (CVT) tests.
CVA500 simultaneously measures CT saturation, knee point, ratio, and polarity test on all taps. The automated test feature performs all required measurements in one test including CT demagnetization, insulation resistance, winding resistance, and burden test without any operator intervention. This significantly reduces testing time and helps to avoid possible issues caused by operators.

The CT saturation testing method uses the variable 50/60 Hz AC voltage (up to 2000 V). CVA500 applies a sinusoidal voltage at mains frequency (50/60 Hz) directly to the low-voltage CT terminals (or high-voltage VT terminals). Thus the device simulates the same operation conditions which also occur in instrument transformer nominal operation and performs direct parameter measurement. The CTs parameters are affected when the frequency deviates from the nominal frequency. This is main advantage of using variable 50/60 Hz voltage when compared to the variable frequency signals. All results are obtained by direct measurement, not by using additional estimation and calculation methods.

Application

The list of instrument application includes a full range of tests:

• Saturation curve and knee point for CTs

• Turns ratio, polarity, and phase angle tests for CTs, VTs, and CVTs

• Demagnetization

• Insulation resistance for CTs, VTs and CVTs

• Winding resistance for CTs, VTs and CVTs

• Burden test for CTs, VTs, and CVTs

Current and Voltage Transformer Analyzer CVA500 [EN]