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Chapter 6 Operation
6.1 General
To ensure trouble-free running, a machine must be looked after and carefully
supervised.
Always before starting up the machine ensure that:
•
No maintenance is ongoing.
•
Personnel and equipment associated with the machine are ready to start up the
machine.
For the start-up procedure see Chapter 5.6. Starting.
In case any deviations from expected normal operation are noticed, e.g. elevated
temperatures, noise or vibration, shut down the machine and find the reason for
the deviations. If necessary, consult the manufacturer of the machine.
NOTE: The machine may have hot surfaces when running with load.
NOTE: Overloading the machine may cause winding damages.
6.2 Normal operating conditions
The machines supplied by ABB are individually designed to operate in normal
operating conditions according to the IEC standard, technical specifications and
internal ABB standards.
The operation conditions, such as maximum ambient temperature and maximum
operating height, are specified in the performance data sheet. The foundation
should be free from external vibration, and the surrounding air free of dust, salt
and corrosive gases or substances.
6.3 Protection of synchronous generators
Protection of synchronous generators depends e.g. on the generator type and
application. Recommended protections in general are:
•
Thermal overload in stator winding; I >
•
Network short-circuit, I >>
•
Stator interwinding short-circuit, differential protection relay.
•
Stator earth-fault, earth-fault relay.
•
Over voltage, over voltage relay.
•
Unbalanced load or shorted turns in the same phase, I2/In.
•
Under excitation and loss of synchronism, under-reactance relay.
•
Under voltage and intermittent loss of voltage, under voltage relay.
•
Temperature supervision of temperature detectors, PT-100 monitoring.
•
Inlet cooling air temperature high.
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