Connecting Analog Signals - ABB Relion 650 Series Installation Manual

Section 5
Connecting
5.4
28
Each IED must have its own earth lead connected to the earth
circuit connector.
2. Connect the earth lead to the earth bar.
3. Thread the copper cable on the protective earth pin.
4. Tighten the nut on the protective earth pin.
5. Support the earth lead so that it cannot break or weaken.
Observe the situations for mechanical, chemical or electrochemical reasons.

Connecting analog signals

A connection diagram is needed to connect the analog signals.
Use the compression type for CT/VT terminals.
The wires for the analog signals can be connected to the CT/VT terminals before
the connector is connected to the IED. The connector features an automatic short-
circuit mechanism for the current terminals. Therefore, detaching the connector
from the unit will not open the secondary circuit of the CT which otherwise could
cause dangerously high voltages.
To avoid a mismatch between CT and VT connections the connectors are 'pre-coded'.
GUID-44E54B97-4E48-46E1-8515-ED3087BACC0A V1 EN
Figure 15: Loose CT/VT connector coding
1 CT connector coding
2 VT connector coding
3 Empty connector
1MRK 514 013-UEN -
650 series
Installation Manual