The SIGMA D is a combined directional short-circuit and directional earth fault indicator for medium-distribution networks. The device is current transformer powered, thus no auxiliary supply is required. Phase selective current and voltage measurements as well as phase angle measurements can be done via USB cable and SIGMA Explorer software. The voltage information will be taken from the integrated voltage detecting system, either WEGA 1.2 C, WEGA 2.2 C or WEGA 1.2 vario. Optional the voltage information can be taken from the HR interface or capacitive insulators.
