Difference between Metering CT and Protection CT I War of Transformers
Metering CT versus Protection CT. Both of them have different characteristics and it’s very important to know the difference between them.
| Parameter | Metering CT | Protection CT | Link |
|---|---|---|---|
| Saturation Level | Require Low Saturation Levels, so that they get Saturated, during Faults (when very high current flows), therby Protecting the Instruments. | Requires High Saturation Level, so that they can give output in case of Faults ( when huge current flows). | |
| Accuracy | Very high Accuracy required | Accuracy may not be as high as Metering CT | |
| Class | 0.1, 0.2, 0.2S, 0.5, 1, 3, 5. Nowadays 0.2S Class is used, especially if it is used for Power Transformer LV. | 5P20, PS . |