Connecting To Protective Ground; Connecting The Power Supply Module - Hitachi 670 Series Installation Manual

Section 6
Connecting
6
6.1.2

Connecting to protective ground

Connect the protective grounding screw (pos 1 in figure 26) on the rear of the IED to the closest possible
grounding point in the cubicle. Electrical codes and standards require that protective ground cables are
green/yellow conductors with a cross section area of at least 2.5 mm
The cubicle must be properly connected to the station grounding system. Use a conductor with a core
cross section area of at least 4 mm
1
IEC05000509 V4 EN-US
Figure 26:
Pos
1
6.1.3

Connecting the power supply module

The wiring from the cubicle terminal block to the IED terminals (see Figure
diagram) must be made in accordance with the established guidelines for this type of equipment.
The auxiliary power wiring should have a minimum cross-sectional area of 1.0 mm
of 250 V. Branch circuit protection must be provided in the auxiliary power supply wiring to the IED, and if
48
How to connect the high impedance restricted earth fault protection scheme to one CT input in IED.
Rear view of IED showing the grounding point
Insert only the corresponding male connector into the female connector. Inserting anything
else (such as a measurement probe) may violate the female connector and prevent a proper
electrical contact between the printed circuit board and the external wiring connected to the
screw terminal block.
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2
(AWG 12).
Description
Protective conductor terminal. For connection of the external protective (ground)
conductor.
Use the protective conductor terminal (1) for connection to the stations grounding
system.
1MRK514026-UUS Rev. P
2
(AWG14).
1/1A
2/1B
3/3A
4/3B
20 for PSM connection
2
and a voltage rating
Installation manual
M11997-4 v11
SEMOD128790-5 v8
670 series