Siemens SIPROTEC 7SS522 V4.6, Руководство пользователя

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Functions
192
7SS52 V4 Manual
C53000-G1176-C182-3
The parameter
Ip
(
1214/BU
) is used to set the threshold for the phase currents in the
overcurrent stage of the inverse-time O/C protection.
This parameter is only displayed if the parameter
CHARAC. PH
(
7812/BU
) is set to
IN-
VERSE TIME .
TIp
The parameter
TIp
(
1215/BU
) is used to set the trip time delay (time multiplier) for
the overcurrent stage of the inverse-time O/C protection.
This parameter is only displayed if the parameter
CHARAC. PH
(
7812/BU
) is set to
IN-
VERSE TIME .
RMS FORMAT
The parameter
RMS FORMAT
(
1216/BU
) is used to select the format in which the cur-
rents will be evaluated for the current calculation of the overcurrent stage.
This parameter is only displayed if the parameter
CHARAC. PH
(
7812/BU
) is set to
IN-
VERSE TIME .
With setting FUNDAMENTAL the fundamental wave of the currents will be evaluated.
With setting TRUE RMS the r.m.s. value of the currents will be evaluated.
MAN.CLOSE
The parameter
MAN.CLOSE
(
1221/BU
) is used to set whether the trip time delay for
the overcurrent or high-set current stage for the phase currents will be overridden if
the circuit breaker is manually closed.
With setting I>> UNDELAYED the delay time set with the parameter
TI>>
(
1203/BU
)
will be disregarded.
With setting I> /Ip UNDELAYED. the delay time set with the parameter
TI>
(
1213/
BU
) will be disregarded.
With setting INEFFECTIVE the delay times set with the parameters TI>> ( 1203/BU )
or
TI>
(
1213/BU
) respectively are not disregarded.
O/C EARTH
The parameter
O/C EARTH
(
1501/BU
) is used to activate and deactivate the O/C pro-
tection for the earth current.
With setting
ON
, the O/C protection for the earth current is active.
With setting
OFF
, the O/C protection for the earth current is deactivated.
IE>>
In a first step, the high-set stage IE >> is set (
1502/BU
to
1506/BU
). For the settings,
similar factors as for the stages I>> and I> have to be considered. If the IE>> stage is
not needed, the time
TIE>>
(
1503/BU
) is set to infinite.
The parameter
IE>>
(
1502/BU
) is used to set the threshold for the earth current in
the high-set stage (definite-time).
TIE>>
The parameter
TIE>>
(
1503/BU
) is used to set the trip time delay for tripping of the
high-set current stage (definite-time). The delay time is started when the threshold for
the earth current is exceeded. This threshold is set with the parameter
IE>>
(
1502/
BU
).
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