output VRMSSTAT is set to TRUE. The output VRMSSTAT can be used in the logic
that selects the active reference impedance. The possibility to use this feature and the
setting of
VLimRMS
shall be defined during the commissioning of the protection
system.
FreqInjected
shall be set to the same value as on the injection unit REX060 for the
stator earth-fault protection. The setting range is 50 – 250 Hz in steps of 0.001 Hz.
Values which corresponds to the harmonics of the fundamental frequency (50 or 60
Hz) should be avoided, as well as other harmonics related to other frequencies in the
power system. For instance railway electrical systems with the power supply frequency
16 2/3 Hz or 25 Hz. The recommended setting is 87 Hz for 50 Hz system and 103 Hz
for 60 Hz system. The setting is fine tuned at commissioning during calibration
measurement and analysis in the ICT tool.
The complex factors
k1Real
,
k1Imag
,
k2Real
,
k21Imag
and the real and imaginary part
of the reference impedances RefR1...RefR5 and RefX1...RefX5 are setting parameters.
The factors k1 and k2 as well as the first reference impedance (RefR1, RefX1) are
defined while performing the three steps of the calibration by ICT (Injection
Commissioning Tool). The other 4 reference impedances (RefR2, RefX2)...(RefR5,
RefX5) are defined through the Commissioning tab of ICT according to the needs of
the machine during the commissioning of the protection system. ICT must be used for
the calibration since this tool perform necessary calculations to derive above factors.
This tool is an integrated part of the PCM600 tool.
FilterLength
the setting affects the length of samples used to calculate
R
f
. Default value
1s shall normally be used. Leave
FilterLength
at its default value; any change of this
parameter shall be defined under ABB supervision.
8.9
Under impedance protection for generators and
transformers ZGVPDIS
GUID-1A3A4890-5CFA-417B-BDA4-EA001502AA60 v2
8.9.1
Identification
GUID-752C21F4-972E-4E97-AB15-075FF720527F v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/
IEEEidentification
Under impedance function for
generators and transformers
ZGVPDIS
S00346 V1 EN-US
21G
Section 8
1MRK 502 071-UUS A
Impedance protection
330
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
Summary of Contents for RELION 670 SERIES REG670
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