•
All 3 phase-to-phase voltages are above the threshold value.
•
The power frequency is within a specified range.
•
The reclosure time delay, started by the operate of specific protection functions, has elapsed. The time
delay is started by the first operate signal of the protection stages configured via the Configuration
parameter. All protection stages of the voltage protection, the frequency protection, and the QV protec-
tion are available for configuration.
External Start of Reclosure Time Delay
Reclosure time delay can be started via the binary input signal
>V, f trip
, which can be connected to
external voltage and frequency protection trip signals.
Blocking of the Stage
The stage can be blocked via the binary input signal
>Block stage
.
Application and Setting Notes
Parameter: Configuration
•
Default setting (_:13951:102) Configuration = no stage
You use the Configuration parameter to define which operate signal of specific protection functions starts
the release time delay of the Reclosure stage:
•
Overfrequency protection
•
Underfrequency protection
•
Overvoltage protection
•
Undervoltage protection
•
Protection stage of undervoltage-controlled reactive-power protection
When the protection stage of undervoltage-controlled reactive-power protection is selected, only the signal
Operate (generator)
can start the release time delay of this stage. The signal
Operate (grid)
cannot
start the release time delay.
The configuration depends on the specific application.
Parameter: I> release threshold
•
Recommended setting value (_:13951:106) I> release threshold = 0.100 A
You use the I> release threshold parameter to define a precondition that the stage can work.
The default setting is at 10 % of the rated current. Siemens recommends using the default setting.
Parameter: V> threshold value
•
Recommended setting value (_:13951:101) V> threshold value = 95.000 V
You use the V> threshold value parameter to set one of the 2 release criteria. The setting should be set
above the lower value of the allowed voltage range, according to the national transmission code. In Germany,
the recommended overvoltage threshold is 95 % of the rated voltage. Therefore Siemens recommends using
the default setting.
Parameter: Frequency range
•
Recommended setting value (_:13951:104) f difference positive = 0.05 Hz
•
Recommended setting value (_:13951:105) f difference negative = -2.50 Hz
You use these 2 parameters to define the admitted frequency deviation from the rated frequency. f differ-
ence positive defines the upper frequency range limit. f difference negative defines the lower
frequency range limit.
6.40.4.2
Protection and Automation Functions
6.40 Undervoltage-Controlled Reactive-Power Protection
834 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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