Measurands originating from CT or VT measurements can be obtained from the protection relay in two ways. They can be viewed either as primary values or as per-unit values.
The primary values are represented internally as decimal numbers. The primary units are [A] for current and [kV] for voltage. The internal representation of the per-unit values is always 1.0 at nominal current or voltage. A typical range for a per-unit value is 0.00...40.00, that is 0 to 40 times nominal. With Communication Management in PCM600, the user can select how these values are presented in the Modbus register. It may be necessary to upscale or downscale the primary values to fit the register's 16-bit integer value. The register's scale factor and offset parameters can be used for this purpose. By default, this protection relay shows per-unit values multiplied by the scaleFactor 1000.