If the
Pickup
signal is maintained during the
Operate delay
time, an
Operate
indication is issued.
Exclusive Stage Activation
A load-shedding schema defines in which order feeders (power consumers) are disconnected. To not discrimi-
nate power consumers, this order is changed regularly. The mechanism of exclusive stage activation supports
this order change efficiently.
Even though multiple protection stages are instantiated and their
Mode
parameters are set to
on
, you can only
activate one stage at a time via the exclusive stage activation in an Underfrequency load shedding function.
The exclusive stage activation comprises the following input signals:
•
The SPS signal
>Exclusive activation
which is offered in the protection stage.
•
The SPC signal
Exclusive activation
which is offered in the protection stage.
This SPC signal allows the exclusive stage activation from a station controller.
•
The SPS signal
>Activate all stages
which is offered in the function block General.
The protection stage which receives the newest SPS signal
>Exclusive activation
or SPC signal
Exclu-
sive activation
remains active and all other stages are deactivated. If 2 or more protection stages simul-
taneously receive the SPS signals
>Exclusive activation
and/or the SPC signals
Exclusive activa-
tion
, only the protection stage with the largest stage number is activated.
If the SPS signal
>Activate all stages
is activated, the exclusive stage activation is reset, that is, all
protection stages whose
Mode
parameters are set to
on
become active again.
After a normal device restart (reset), the statuses of the protection stages which were influenced by the SPS
signal
>Exclusive activation
or the SPC signal
Exclusive activation
are still maintained.
After an initial startup, the exclusive stage activation is reset.
EXAMPLE
Configured protection stages:
Protection stages 1 to 8
Protection stages whose
Mode
parameters are set to
on
:
Protection stages 1 to 8
The following cases occur in sequence:
•
Case 1:
Scenario: In the protection stage 1, the SPS signal
>Exclusive activation
or the SPC signal
Exclusive activation
is activated.
Result: The protection stage 1 remains active and stages 2 to 8 are deactivated.
•
Case 2:
Scenario: In the protection stage 2, the SPS signal
>Exclusive activation
or the SPC signal
Exclusive activation
is activated.
Result: The protection stage 2 is activated, the stage 1 is deactivated, and stages 3 to 8 remain deacti-
vated.
•
Case 3:
Scenario: The SPS signal
>Activate all stages
is activated.
Result: The protection stages 1 to 8 are activated.
•
Case 4:
Scenario: In the protection stages 2 to 4, the SPS signal
>Exclusive activation
or the SPC signal
Exclusive activation
is activated simultaneously.
Result: The protection stage 4 is activated and the other stages are deactivated.
•
Case 5:
Scenario: A normal device restart (reset) occurs.
Result: After the device restart, the protection stage 4 remains activated and the other stages remain
deactivated.
Protection and Automation Functions
7.20 Underfrequency Load Shedding
842
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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