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7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 49 of 77
3.4.14
Power Protection: Sensitive Power (32S)
Two under/over sensitive power elements are provided in the 4 pole 7SR1004 SEF models, The elements can
measure real, reactive or apparent power.
Sensitive power functionality utilises the I
SEF
current input i.e. a single CT input is used. Balanced load conditions
are assumed. Any one of the three phase currents can be wired to the I
SEF
current input – the POWER PROT’N >
SENSITIVE POWER >
Gn 32S Phase Selection
setting is used to ensure that the correct power is measured.
Gn 32S-n Setting
sets the pick-up power level for the element.
Under-power or over-power operation can be set by the
Gn 32S-n Operation
setting.
An output is given after elapse of the
Gn 32S-n Delay
setting.
Operation of the under/over power elements can be inhibited when:
The measured current is below the
Gn 32S U/C Guard
setting
A VT Fail condition is detected
Inhibit 32S-n
A binary or virtual input.
V
1
V
2
V
3
Enabled
<
&
Gn 32S-n U/C
Guard Setting
Gn32S-n: Power: P, Q, R
Gn32S-n: Direction
Gn32S-n: Setting
Gn 32S-n U/C
Guard
ISEF
32S CT Angle Comp
Gn 32S-n Delay
32S-n
General Pickup
En.
+W
-VAr
-W
-VAr
-W
+VAr
+W
+VAr
Enabled
Inhibit
VT Fail
&
Gn 32S-n VTS
Action
Gn 32S-n Element
Inhibit 32S-n
&
Gn32S-n: Phase Selection
Gn32S-n: Operation: Under/Over
Figure 3-28 Logic Diagram: Sensitive Power Protection (32S)
Содержание 7SR10 Argus Series
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