Setting Guidelines - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
9.4.3
9.4.3.1
Transformer protection RET670 2.2 ANSI
Application manual

Setting guidelines

When inverse time overcurrent characteristic is selected, the trip time
of the stage will be the sum of the inverse time delay and the set
definite time delay. Thus, if only the inverse time delay is required, it is
important to set the definite time delay for that stage to zero.
The parameters for the four step residual overcurrent protection are set via the local
HMI or PCM600. The following settings can be done for the function.
Common base IED values for primary current (IBase), primary voltage (UBase) and
primary power (SBase) are set in the global base values for settings function
GBASVAL.
GlobalBaseSel: This is used to select GBASVAL function for reference of base values.
SeqTypeUPol: This is used to select the type of voltage polarising quantity i.e. Zero seq
and Neg seq for direction detection.
SeqTypeIPol: This is used to select the type of current polarising quantity i.e. Zero seq
and Neg seq for direction detection.
SeqTypeIDir: This is used to select the type of operating current quantity i.e. Zero seq
and Neg seq for direction detection.
Common settings for all steps
AngleRCA: Relay characteristic angle given in degree. This angle is defined as shown
in Figure 268. The angle is defined positive when the residual current lags the
reference voltage (Vpol = 3V or V )
0 2
Section 9
Current protection
IP14988-1 v1
M15282-3 v11
M15282-81 v10
537