Siemens 6MD85, Руководство пользователя

Страница: 617 / 1256

Blocking of the Time Delay (Basic and Advanced Stage)
You can use the binary input signal
>Block delay & op.
to prevent the start of the time delay and thus
also the operate signal. A running time delay is reset. The pickup is indicated and the fault logging and
recording takes place.
Blocking of the Operate Delay and the Operate Signal via the Device-Internal Inrush-Current Detection Function
(Basic and Advanced Stage)
Blocking of the operate delay and the operate signal via the device-internal Inrush-current detection function
is described in chapter
7.4.7.1 Description .
Influence of Other Functions via Dynamic Settings (Advanced Stage)
If available in the device, the following functions can influence the overcurrent-protection stages:
•
Automatic reclosing
•
Cold-load pickup detection
•
Binary input signal
The influence of these functions via dynamic settings is described in chapter 7.4.8.1 Description .
Application and Setting Notes
Parameter:
Method of measurement
•
Recommended setting value
(_:691:8) Method of measurement
=
fundamental comp.
With the
Method of measurement
parameter, you define whether the stage uses the
fundamental
comp.
(standard method) or the calculated
RMS value
.
Parameter Value Description
fundamental comp.
Select this method of measurement if harmonics or transient current peaks
are to be suppressed.
Siemens recommends using this method as the standard method.
RMS value
Select this method of measurement if you want the stage to take harmonics
into account (for example, at capacitor banks). Consider that aperiodic DC
components present in the secondary circuit are measured and can cause
an overfunction.
For this method of measurement, do not set the
threshold value
of the
stage to less than 0.1 I
rated,sec
. If currents from more than one measuring
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
rated,sec
multiplied by the number of
added currents.
Parameter:
Type of character. curve
•
Default setting
(_:691:130) Type of character. curve
=
IEC normal inverse
The device offers all the usual inverse-time characteristic curves according to IEC and ANSI. Select the
Type
of character. curve
required for your specific application. For more information about the parameter
Type of character. curve
, refer to chapter 11.8.2 Stage with Inverse-Time Characteristic Curve .
Parameter:
Min. time of the curve
•
Default setting
(_:691:113) Min. time of the curve
=
0.00 s
This parameter is only available in the advanced stage.
With the
Min. time of the curve
parameter, you define a minimum operate delay time. The operate
delay time of inverse-time characteristic curve never falls below the minimum operate delay time. If the
setting is left on its default value of 0 s, this parameter has no effect on the inverse-time characteristic curve.
7.4.5.2
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 617
C53000-G5040-C015-9, Edition 11.2017