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AFC094AE02 HIEE200130R0002 control panel

Phase compensation This setting is for correcting the phase error between the v.t’s and c.t’s, which have a considerable adverse influence on the measurement of active power at low power factors. Example 2 The active power error at rated current and a power factor of cos = 0 for a total phase error  of 10' is P = 0.03   = 0.03  10 = 0.3% [%; 1; min] This is an error which is not negligible at a setting of 0.5%. The total error corresponds to the difference between the v.t. and c.t. errors. The case considered in this example of full reactive current (100%) would scarcely occur in practice, but currents from about 80% are possible. Application as reverse power protection The reverse power function is used primarily to protect the prime mover. It is necessary for the following kinds of prime mover:
steam turbines
Francis and Kaplan hydro units
gas turbines
diesel motors. Two reverse power functions are used for prime movers with ratings higher than 30 MW, because of their importance and value. The reverse 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.

Overload (OLoad-Stator)

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. It is for just such cases that the integrator (“Delay” function) is needed to ensure reliable tripping.