Siemens 6MD85 Manual page 592

Protection and Automation Functions
7.2 Automatic Reclosing Function
Parameter: Start from idle state allow.
This parameter is only important and can be set if you use the automatic reclosing function in an operating
mode with action time.
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Default setting (_:6571:102) Start from idle state allow. = yes
With the parameter Start from idle state allow. you can determine whether the action time of this
automatic reclosing cycle is started, if the automatic reclosing function is in idle state during with incoming
general pickup. Please set the parameter always to yes , if the automatic reclosing function is configured for
only 1 cycle. If several cycles are configured, you can control the effectiveness of the automatic reclosing
cycles with this parameter and various action times.
Detailed information about the functionality can be found in Chapters
Mode 1: With Tripping/With Action Time
Action Time.
Parameter: Action time
This parameter is only important and can be set if you use the automatic reclosing function in an operating
mode with action time.
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Default setting (_:6571:103) Action time = 0.2 s
With this parameter Action time you can determine, within which time frame the trip command must
appear, in order to start the automatic reclosing function. If the trip command occurs only after the action
time has expired, automatic reclosing does not occur within the active automatic reclosing cycle.
You can find detailed information about the functionality in
Chapters 7.2.4.6 Cycle Control with Operating Mode 1: With Tripping/With Action Time
Control with Operating Mode 2: With Pickup/With Action
Parameter: Dead time aft. 3-pole trip
This parameter is only important and can be set if you use the automatic reclosing function in an operating
mode with tripping.
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Default setting (_:6571:108) Dead time aft. 3-pole trip = 0.5 s
With this parameter Dead time aft. 3-pole trip , you can determine after which dead time the auto-
matic reclosing function will be executed. After a 3-pole trip of the circuit breaker, the system stability is
priority. Since the switched off line cannot develop synchronizing forces, only a short dead time is permitted in
most cases. The usual duration is 0.3 s to 0.6 s. A longer period can be tolerated if a synchrocheck is carried
out prior to reclosing. Longer 3-pole dead times are also possible in radial systems.
Parameter: Dead time aft.1ph. pickup, Dead time aft.2ph. pickup, Dead time aft.3ph. pickup
This parameter is only important and can be set if you use the automatic reclosing function in an operating
mode with pickup.
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Default setting (_:6571:104) Dead time aft.1ph. pickup = 1.2 s
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Default setting (_:6571:105) Dead time aft.2ph. pickup = 1.2 s
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Default setting (_:6571:106) Dead time aft.3ph. pickup = 0.5 s
With the 3 dead-time parameters, you can determine after which dead time the automatic reclosing function
will be executed. Please set the times as desired for the respective type of short circuit.
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The parameter Dead time aft.1ph. pickup applies to dead times after 1-phase short circuits and
the following protection tripping: A, B, C, or A-Gnd, B-Gnd, C-Gnd
•
The parameter Dead time aft.2ph. pickup applies to dead times after 2-phase short circuits and
the following protection tripping: A-B, B-C, C-A, or A-B-gnd, B-C-gnd, C-A-gnd
•
The parameter Dead time aft.3ph. pickup applies to dead times after 3-phase short circuits and
the following protection tripping: A-B-C or A-B-C-Gnd
592
und 7.2.4.7 Cycle Control with Operating Mode 2: With Pickup/With
Time.
SIPROTEC 5, High-Voltage Bay Controller, Manual
7.2.4.6 Cycle Control with Operating
and 7.2.4.7 Cycle
C53000-G5040-C015-9, Edition 11.2017