A CT / PT Analyser is an essential testing instrument used in electrical power systems to evaluate the performance, accuracy, and safety of Current Transformers (CTs) and Potential/Voltage Transformers (PTs). These transformers play a critical role in measurement, metering, and protection schemes across substations, power plants, and industrial electrical networks. Accurate testing of CTs and PTs is vital to ensure reliable power system operation, prevent protection malfunctions, and comply with international testing standards.