Verifying The Settings - ABB REG670 2.0 IEC Commissioning Manual

1MRK502053-UEN B
12.4.5.1
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
Two current channels I3P1 and I3P2 are available in OOSPPAM function to allow the
direct connection of two groups of three-phase currents; that may be needed for very
powerful generators, with stator windings split into two groups per phase, when each
group is equipped with current transformers. The protection function performs a
simple summation of the currents of the two channels I3P1 and I3P2.

Verifying the settings

The test of the out-of-step protection function is made to verify that the trip is issued
if the following events happen.
• the impedance, seen by the function, enters the lens characteristic from one side
and leaves it from the opposite side
• the trip is issued according to the settings TripAngle and tBreaker
The tripping zone needs to be detected and confirmed. The test may be performed by
taking into account the following key points that are shown in Figure 37:
• the point RE (RE = Receiving End)
• the intersection between the line segment SE-RE and the X-line, which is defined
through the setting ReachZ1
• the point SE (SE = Sending End)
IEC10000141 V2 EN
Figure 37: Trajectory of the impedance Z(R, X) for the injected current with two
components: a 50 Hz component and a 49.5 Hz current component
The test of the out-of-step protection function requires the injection of the analog
quantities for a quite long time. The rating of the analogue channels is considered in
order to avoid any hardware damage. The test current is lower than the continuous
permissive overload current I
module.
I = I(50 Hz) + I(49.5 Hz)
of the protection current channels of the transformer
ovrl
Section 12
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