5.6
Connection
The P631 Transformer Differential Protection Device must be connected in
accordance with the terminal connection diagram as indicated on the type
identification label. The relevant terminal connection diagrams that apply to the
P631 are to be found either in the supporting documents supplied with the
device, or in
In general copper conductors with a cross section of 2.5 mm² (US:
AWG12) are
sufficient to connect a system current transformer to a current input on the P631.
To reduce CT knee-point voltage requirements, it may be necessary to install
shorter copper conductors with a greater cross section between the system
current transformers and the current inputs on the P631. Copper conductors
having a cross section of 1.5 mm² (US:
AWG14) are adequate to connect binary
signal inputs, the output relays and the power supply input.
All connections run into the system must always have a defined potential.
Connections that are pre-wired but not used should preferably be grounded when
binary inputs and output relays are isolated. When binary inputs and output
relays are connected to common potential, the pre-wired but unused connections
should be connected to the common potential of the grouped connections.
5.6.1
Connecting Measuring and Auxiliary Circuits
5.6.1.1
Power Supply
Before connecting the auxiliary voltage V
A
for the P631 power supply, it must be
ensured that the nominal value of the auxiliary device voltage corresponds with
the nominal value of the auxiliary system voltage.
5.6.1.2
Current-Measuring Inputs
When connecting the system transformers, it must be ensured that the
secondary nominal currents of the system and the device correspond.
Warning!
⚫
The secondary circuit of live system current transformers must not be opened!
If the secondary circuit of a live CT is opened, there is the danger that the
resulting voltages will endanger personnel and damage the insulation.
Warning!
⚫
For pin-terminal connection devices, the terminal block for system current
transformer connection is not a shorting block! Therefore always short-circuit
the system current transformers before loosening the threaded terminals.
5.6.1.3
Connecting the Measuring Circuits
The system current transformers must be connected in accordance with the
standard schematic diagram shown in
. It is essential that the
grounding configuration shown in the diagram be followed. If the CT or VT
connection is reversed, this can be taken into account when making settings (see
P631
5 Installation and Connection
5-12
P631/EN M/R-11-C // P631-310-650
Summary of Contents for P631
Page 2: ......
Page 4: ......
Page 7: ...Changes after going to press...
Page 8: ......
Page 16: ...P631 Table of Contents 8 P631 EN M R 11 C P631 310 650...
Page 56: ...P631 2 Technical Data 2 28 P631 EN M R 11 C P631 310 650...
Page 236: ...P631 3 Operation 3 180 P631 EN M R 11 C P631 310 650...
Page 246: ...P631 4 Design 4 10 P631 EN M R 11 C P631 310 650...
Page 266: ...P631 5 Installation and Connection 5 20 P631 EN M R 11 C P631 310 650...
Page 276: ...6 8 Configurable Function Keys P631 6 Local Control HMI 6 10 P631 EN M R 11 C P631 310 650...
Page 548: ...P631 10 Commissioning 10 10 P631 EN M R 11 C P631 310 650...
Page 568: ...P631 12 Maintenance 12 8 P631 EN M R 11 C P631 310 650...
Page 570: ...P631 13 Storage 13 2 P631 EN M R 11 C P631 310 650...
Page 572: ...P631 14 Accessories and Spare Parts 14 2 P631 EN M R 11 C P631 310 650...
Page 576: ...P631 15 Order Information 15 4 P631 EN M R 11 C P631 310 650...
Page 582: ...P631 A2 Internal Signals A2 4 P631 EN M R 11 C P631 310 650...
Page 608: ...P631 A4 Telecontrol Interfaces A4 18 P631 EN M R 11 C P631 310 650...
Page 637: ......