Application And Setting Notes - Siemens 6MD85 Manual

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
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
7.4.5.2

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
fundamental comp.
RMS value
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
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.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
7.4.7.1 Description .
Description
Select this method of measurement if harmonics or transient current peaks
are to be suppressed.
Siemens recommends using this method as the standard method.
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
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
added currents.
7.4.8.1 Description
. If currents from more than one measuring
rated,sec
rated,sec
11.8.2 Stage with Inverse-Time Characteristic
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
.
multiplied by the number of
Curve.
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