Westinghouse CC12403 1021621 card EMERSON

Westinghouse CC12403 1021621 card EMERSON

Technical data of product parameters

Two reverse power CC12403 1021621 functions are used for prime movers with
ratings higher than 30 MW, because of their importance and
value.
The reverse CC12403 1021621 power function has two stages. The setting is half
the slip power of the generator/prime mover unit and is the same
for both stages.
The first stage has a short time delay and is intended to protect
against overspeeding during the normal shutdown procedure. By
tripping the main circuit-breaker via the reverse power function,
the possibility of overspeeding due to a regulator failure or
leaking steam valves is avoided. To prevent false tripping in the
case of steam turbines, the reverse power function is enabled by
auxiliary contacts on the main steam valves of the prime mover.The purpose of the second stage is to guard against excessively
high temperature and possible mechanical damage to the prime
mover. The time delay can be longer in this case, because the
temperature only increases slowly. Should power swings occur
at low load due to the speed regulator or system instability, the
second stage will not be able to trip, because the function repeatedly picks up and resets before the time delay can expire CC12403 1021621. It
is for just such cases that the integrator (“Delay” function) is
needed to ensure reliable tripping.The rotor overload function protects the rotor winding of generators against excessive temperature rise as a result of overcurrents. The function is applicable to turbogenerators designed
according to the American standard ASA-C50.13 or a similar CC12403 1021621
standard defining overload capability. It is connected to c.t’s in
the AC excitation supply. It may not be used for brushless excitation systems.
Providing compensation using the reference value of the A/D
channel has not been made, the reference current IB for the
protection is calculated from the AC load current IB1 of the excitation supply, which is usually the same as the full load excitation
current, and the c.t. rated currents

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