Technical Data - ABB REG650 Technical Manual

Section 8
Voltage protection
8.5.8
254
there is a possibility to reduce the sensitivity of the protection when the generator
circuit breaker is open.
With the setting CBexists change of the sensitivity is enabled. If the binary input
signal CBCLOSED is activated the set sensitivity is valid. If the generator circuit
breaker is opened the binary input CBCLOSED is deactivated and the sensitivity is
changed. This is done by changing the factor Beta which is multiplied with a set
constant FactorCBopen.
In addition to the binary outputs also some analog outputs are available from the
protection function in order to enable easier commissioning:
E3: the magnitude of the 3
primary volts
UN3: the magnitude of the 3
the generator
UT3: the magnitude of the 3
the generator
ANGLE: the angle between the phasors UN3 and UT3 given in radians
DU3: the magnitude of the 3
BU3: the magnitude of the 3
UN: the fundamental frequency voltage measured in the neutral point of the generator

Technical data

Table 155: STEFPHIZ technical data
Function
Fundamental frequency level
UN (95% Stator EF)
Third harmonic differential level
Third harmonic differential block
level
Timers
Filter characteristic:
Fundamental
Third harmonic
rd
harmonic voltage induced in the stator given in
rd
harmonic voltage measured in the neutral point of
rd
harmonic voltage measured in the terminal point of
rd
harmonic differential voltage
rd
harmonic bias voltage
Range or value
UBase
(1.0–50.0)% of
UBase
(0.5–10.0)% of
(0.1–10.0)% of UBase
(0.020–60.000) s
Reject third harmonic by 1–40
Reject fundamental harmonic by
1–40
1MRK 502 034-UEN -
Accuracy
± 0.5% of U
r
± 5.0% of U
r
± 5.0% of U
r
± 0.5% ± 25 ms
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Technical Manual