the grid is also referred as infinite bus bar in terms of
synchronisation but it also implies fixed voltage,fixed
frequency,phase seuence,phase voltages

infinite bus bars means the whose parameters like voltage,
frquency, phase sequense remains constant even after change
in parameters in the local ckts.

An infinite bus bar is a parallely connected network of
ALTERNATORS, whose frequency and voltage remains
constantregardless of power drawn or supplied from it.

Infinite busbar is a whose parameters like voltage,
frequency and phase sequence remain constanat even change
in the connected load to the infinite busbar.

an infinite bus bar may be treated like a m/c with large
amount of inertia, so that the frequency will not change.
and the voltage and frequency remains unchanged regardless
of the equipment connected to it.

INFINITE BUS BAR is a very large conductive circuit in which
infinite Alternators are connected to maintain fixed
voltage,fixed frequency,phase sequence and phase voltages.

Infinite bus bar is the source where n numbers of
generators are loaded thereby impedance of the system
becomes so high that connecting or disconnecting any load
does not impact on voltage,frequency of the system.
The Voltage , Frequency of Infinite Busbars always remains
constant. This is what is called as Grid also