Pos Description
1 Scheme earthing point
It is important to insure that only one earthing point exist in this scheme.
2 Three-phase plate with setting resistors and metrosils. Protective earth is a separate 4 mm screw
terminal on the plate.
3 Necessary connection for three-phase metrosil set.
4 Position of optional test switch for secondary injection into the high impedance differential IED.
5 Necessary connection for setting resistors.
6 Factory-made star point on a three-phase setting resistor set.
The star point connector must be removed for installations with 670 series
IEDs. This star point is required for RADHA schemes only.
7 Connections of three individual phase currents for high impedance scheme to three CT inputs in
the IED.
7.2.3.2 Connections for 1Ph High impedance differential protection HZPDIF
Restricted earth fault protection is a typical application for 1Ph High impedance
differential protection HZPDIF. Typical CT connections for the high impedance
based protection scheme are shown in figure 62.
1MRK 502 071-UEN - Section 7
Differential protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 157
Application manual
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