Description
Current and Voltage Transformer Analyzer CVA500 is DV Power instrument specially made for testing current transformers (CT). It can perform multiple tests – turns ratio, saturation (knee point), burden, demagnetization, winding resistance, and insulation resistance. Besides these tests, CVA500 calculates ratio and phase error for different primary currents and different burdens, which can help in determining if CT is within its specified accuracy class. For measurement type CTs, instrument security factor (FS) is calculated, while accuracy limit factor (ALF) is calculated for protection type CTs.
CVA500 can be connected to all CT measurement terminals including primary side, up to 5 taps on secondary side, and burden, at once. An internal sophisticated relay matrix enables performing ratio, saturation, burden, and winding resistance measurements in all 5 taps automatically, without any cable reconnection. Insulation resistance can be measured between any parts – primary to ground, secondary to ground, primary to secondary, and secondary to other core(s) in case of multi-core type CTs.
CVA500 is a very powerful device. It can output up to 2000 V AC (at rated frequency, 50 or 60 Hz) for saturation (knee point) test, and 500 V DC or 1000 V DC for insulation resistance test.
CVA500 can also be used for testing inductive voltage transformers (VT/PT) and capacitive voltage transformers (CVT). A wide resistance measurement range allows measuring winding resistance of VTs primary winding, in addition to secondary winding. Operating burden is measured using the burden rated voltage (up to 110 V AC). For turns ratio test, CVA500 can output maximum voltage of 2 kV AC, which ensures reliable and accurate results even on large CVTs. Insulation can be tested between any parts – primary to ground, secondary to ground, primary to secondary, and secondary to other core(s) in case of multi-core type VTs/CVTs.