Siemens 8DJH, Инструкция по установке и эксплуатации

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Installation | 7
91/174 500-8384.9 • Version 11 • Installation and Operating Instructions • 8DJH
7.20.4 Connecting the current transformers
NOTICE
Insufficient contact of the connection bars
Insufficient electrical contact increases the contact resistance and can cause an internal arc
during operation.
⇨ Clean oxidized contact points.
⇨ Do not damage contact surfaces.
⇨ Mount the connection bars without distortions and gaps.
NOTICE
Polluted vessel bushings
Polluted vessel bushings can cause an internal arc during operation.
⇨ Clean the vessel bushings with suitable cleaning agents and a lint-free wiping cloth.
NOTICE
Low insulation at the connection bars.
Low insulation at the connection bars can lead to flashovers during operation.
⇨ Mount the control cap at the vessel bushing.
⇨ Check the control cap insulation for bad spots.
⇨ Check the minimum distance of the control cap to earthed components (≥65 mm).
Mounting the connection bars
1. Mount the spacers and connection bars on the current transformer (tightening torque:
40 Nm).
Type busbar-busbar Type busbar-cable Type cable-cable
Type cable-busbar
1
Connection bar at the top
4
Hexagon head bolt M12 (4x)
2 Spacer
1)
(4x) 5
Conical spring washer (2x)
3
Connection bar at the bottom
6
Connecting cable with cable lug
1)
Depending on the current transformer used
Connecting the connection bars to the busbar
The connection bars are connected to the busbars through the vessel bushings.
1. Clean the vessel bushing of the busbar
1
with cleaning agent and a lint-free wiping cloth,
and rub dry.
2. Install the spacer
7
between the vessel bushing and the connection bar
2
.
3. Push the retaining clip
4
and the conical spring washer
6
onto the cheese head bolt
5
.