Manual MRG3 SEG Electronics GmbH
DOK-TD-MRG3, Rev. D 9
Figure 3.3: MRG3-I Connection diagram “Mains decoupling with time over current protection”
Figure 3.4: Connection diagram with time over current protection and earth fault protection Holmgreen circuit
This connection can be used with three existing phase current transformers when combined phase
and earth-current measuring is required. Disadvantage of the Holmgreen-circuit:
At saturation of one or more C.Ts the relay seemingly detects an earth current.
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