Figure 3.4-4 Functional module diagram for 50G
3.4.2.3 51GVT
The principle is same as the 51G except 51GTV is just only enabled when VTS alarm.
Figure 3.4-5 The Initiation logic diagram for 51GVT
3.4.3 51G Application Scope
51G is designed for protection and clearance of earth faults in distribution and sub-transmission
networks, especially when the neutral point is isolated or earthed via a resonance coil or through
low resistance. It also applies to solidly earthed networks and earth-fault protection of different
equipment connected to the power systems, such as shunt capacitor bank or shunt reactors and
for backup earth-fault protection of power transformers.
3.4.4 51G Settings
In the following table, i is the protection stage number, it can be set according to the requirements.
Table 3.4-3 50G settings
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