3
For High Resistance Grounded Systems (HRG) a single high frequency injection channel (HF1) is employed. See
Figure 3.1 below for the typical system with the Sigma 3 connections. For Low Resistance Grounded Systems
(LRG) two high frequency injection channels (HF1 and HF2) are employed. See Figure 3.2 below for the typical
system with the Sigma 3 connections.
Figure 3.1: Sigma 3 Typical System Diagram (HRG System)
