The working principle of the transformer tester is based on the electromagnetic induction principle and mathematical model analysis, used for testing various electrical characteristics of current transformers (CT) and voltage transformers (PT). These testers typically employ high-precision, automatic linear-regulated DC and AC power sources, along with high-speed, high-reliability digital processing modules to ensure measurement accuracy and stability. The transformer tester can measure parameters such as the伏安特性曲线、error curves, direct resistance, and turns ratio polarity of transformers. It can also directly measure the turns ratio of voltage transformers, qualitatively measure the phase difference and polarity of voltage transformers, and measure the actual secondary load of current and voltage transformers on-site. Moreover, these testers feature user-friendly interfaces with prompts for wiring and operation steps, as well as the functionality to save measurement parameters and print results. The transformer tester can be used in various harsh environments such as high temperatures, high humidity,海上, deserts, extreme cold, and high altitudes, ensuring its applicability under different conditions.
The operating principle of transformer testers involves electromagnetic induction and mathematical model analysis. The principle of electromagnetic induction allows the high current on the primary side to be converted into a low current on the secondary side, which is used for measuring instruments and protective devices. Mathematical model analysis is used to detail the characteristics of transformers, ensuring the accuracy and reliability of test results. By measuring various parameters such as excitation impedance, winding resistance, turns ratio, leakage reactance, and iron loss, analysis and calculations yield various parameters to evaluate the performance of transformers. These testers typically use an indirect method for testing, with accuracy depending on the accuracy of the equivalent model and the precision of each parameter measurement.
