ABB RELION REX640 Technical Manual page 1420

Protection and control

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Condition monitoring functions

Figure 802: Example application configuration for real and reactive power

Once a generator is identified faulty an indication is sent to PMS for starting the

backup generators, or to alter the power sharing between healthy generators, which

would allow the faulty generator to be offloaded and tripped. But in case the

system deteriorates, the function issues commands to shut down the engine or

de-excite the generator. It then issues the command to open the GCB. In case the

GCB tripping is unsuccessful, the function opens the neighboring tie breakers.

The network topology identification enables the function to locate a particular fault

in the network and trip the neighboring tie breakers of healthy generators in case a

network generator is faulty and is still not tripped.

The function monitors the fuel rack position and excitation current of the generator

and rises an alarm in case they are deviating from the set operation mode.

The application configuration needs to ensure that in case any protection

functions like, over speed protection or over voltage protection or if

generator operates outside stability limit then a signal needs to be sent

to shut down the diesel engine and open the GCB.

This needs to be configured outside the DGMGAPC function block.

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Technical Manual