Power parts with in the Inverter can be damaged
as a result of over voltages, power supply failures,
or other faults. Therefore, an extensive protection
system should be there to reduce the likelihood
of damage to the inverter. For this reasons, Each
Thyristor Control Cabinet (TCC) is provided with a
built in protection system called IPS (Inverter Protection
System).
The purpose of the IPR (Inverter Protection Resistor)
is to dispose of DC link energy more gracefully
in the event of a soft crowbar, firing incident. One
Resistor per Thyristor Control Cabinet is required.
For TCC-1, the IPR is mounted on its long hood
side outside wall which is actually an inside wall
for the Main Generator room. The cage housing
IPR-1 also includes two Damping Resistors which
are connected in parallel with the L456 DC Link
Reactor located in the Main Generator room. This
function is to assist L456 in the reduction of power
oscillations on the DC Link, especially in braking
mode. |
