T-GPS User Manual Version 1.2 | 31
There is access for up to fourteen modules to provide various functionality within the device.
Modules must be chosen when ordering, as the module positions will change depending on
which modules are included.
It should be noted that the inputs read from right to left on the rear of the unit (i.e., Input 1 is at
the extreme right position).
It is extremely important that the T-GPS is earthed before use.
6.3
Master Slave Schemes
6.3.1
Single Master
This is suitable when a single T-GPS unit has sufficient outputs to provide a synchronising signal to all
IEDs in the substation. The Master is synchronised directly from the satellite GPS signal picked up by
the antenna. The input is a BNC cable from the antenna, the output depends upon the users’
preference, which in turn will decide which type of output module is used.
6.3.2
Master and Slave
This scheme provides additional outputs from a single antenna. The slave units are synchronised
to the Master which, in turn, is synchronised to the satellite signal picked up by the antenna. The
signal to the slave is carried by an optic fibre, the other connections remain the same.
Figure 6.3 Single master
system
Figure 6.4 Master and
slave system
