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Section 6
Connecting
6.1.2
50
Pos
Description
1
Scheme earthing point
Ensure that only one earthing point exists in this scheme.
2
One-phase plate with stabilizing resistor and metrosil. Protective earth is a separate 4 mm screw
terminal on the plate.
3
Necessary connection for the metrosil.
4
Position of optional test switch for secondary injection into the high impedance differential IED.
5
Necessary connection for stabilizing resistor.
6
How to connect REFPDIF high impedance scheme to one CT input in IED.
Connecting to protective earth
Connect the protective earthing screw (pos 1 in figure 26) on the rear of the IED to the
closest possible earthing point in the cubicle. Electrical codes and standards require
that protective earth cables are green/yellow conductors with a cross section area of at
2
least 2.5 mm
(AWG14).
The cubicle must be properly connected to the station earthing system. Use a
conductor with a core cross section area of at least 4 mm
1MRK514019-UEN A
2
(AWG 12).
670 series 2.0 IEC
Installation manual
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