Power Protection: Sensitive Power (32S); Figure 3-28 Logic Diagram: Sensitive Power Protection (32S) - Siemens 7SR10 Argus Series Manual

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
are assumed. Any one of the three phase currents can be wired to the I
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
Gn 32S-n Element
Enabled
Gn 32S-n VTS
Inhibit
VT Fail
Gn 32S-n U/C
Enabled
Gn 32S-n U/C
32S CT Angle Comp
ISEF

Figure 3-28 Logic Diagram: Sensitive Power Protection (32S)

©2018 Siemens Protection Devices Limited
current input i.e. a single CT input is used. Balanced load conditions
SEF
A binary or virtual input.
Action
&
Inhibit 32S-n
Guard
Guard Setting
&
<
V
1
V
2
V
3
7SR10 Description of Operation
current input – the POWER PROT'N >
SEF
Gn32S-n: Phase Selection
Gn32S-n: Operation: Under/Over
Gn32S-n: Power: P, Q, R
Gn32S-n: Direction
Gn32S-n: Setting
En.
&
-W +W
-VAr -VAr
-W +W
+VAr +VAr
Gn 32S-n Delay
32S-n
General Pickup
Chapter 1 Page 49 of 77