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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 errors for 8 different primary currents and 4 different burdens. Based on obtained ratio and phase error values, CVA500 automatically determines if CT is within its specified accuracy class. For IEC-based measurement type CTs, instrument security factor (FS) is calculated, while accuracy limit factor (ALF) is calculated for IEC-based protection type CTs. In both cases, composite error is measured, and automatic pass/fail assessment is made. For IEEE-based protection type CTs, a secondary terminal voltage (Vb) is provided and automatically assessed as either pass or fail.
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 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 250 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.
Minimizing reconnections is key to faster testing. With CVA500, all required CT tests can be performed within a single setup for single-core CTs, including multi-tap objects. This reduces downtime and significantly improves overall testing efficiency.
CVA500 supports full PC-based control via USB or Ethernet. Through intuitive software, users can input nameplate data, perform tests, analyze graphical results, and generate detailed reports—ensuring efficient and organized data management.
Yes. CVA500 is designed for versatility and can be used to test current transformers, voltage transformers, and capacitive voltage transformers. It supports key measurements such as turns ratio, winding resistance, and insulation testing.
Multi-tap CT testing often requires additional setup or equipment. However, CVA500 allows testing of up to five taps using a standard configuration and a single cable connection—eliminating the need for extra modules or investments.
CVA500 performs evaluations in accordance with IEEE C57.13 and IEC 60044-1 / IEC 61869-2 standards. It automatically calculates ratio error, phase error, and composite error, while also determining parameters such as FS, ALF, and rated secondary terminal voltage—providing a complete and reliable analysis.
