Main Input Board; Figure 18: Main Input Board - GE MiCOM P747 Agile Technical Manual

Chapter 3 - Hardware Design
Terminal Number
Terminal 16
Terminal 17
Terminal 18
Terminal 19
Terminal 20
Terminal 21
Terminal 22
Terminal 23
Terminal 24
Terminal 25
Terminal 26
Terminal 27
Terminal 28
6.6.3

MAIN INPUT BOARD

Figure 18: Main input board

The input board is used to convert the analogue signals delivered by the current and voltage transformers
into digital quantities used by the IED. This input board also has on-board opto-input circuitry, providing eight
optically-isolated digital inputs and associated noise filtering and buffering. These opto-inputs are presented
to the user by means of a MD terminal block, which sits adjacent to the analogue inputs terminal block.
The input board is connected physically and electrically to the transformer board to form a complete input
module.
The main input board can come in several different variants depending on the exact model. The terminal
numbers of the opto-inputs are as follows:
46
CT3
CT4
CT4
CT5
CT5
CT6
CT6
CT7
CT7
CT8
CT8
CT9
CT9
Analogue Input Signal
MiCOM P747
P747-TM-EN-1
P747-TM-EN-1.1