Siemens 7SR12 Argus User Manual

7SR11 & 7SR12 Description Of Operation
©2017 Siemens Protection Devices Limited Chapter 1 Page 59 of 88
3.17 Power Protection: Sensitive Power (32S) – 7SR12
Two under/over sensitive power elements are provided in the 4 pole 7SR12 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
G
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 32
S-n U
/C
Guard Setting
Gn
32
S-n
: Power: P
, Q,
R
Gn32S
-n:
Direction
Gn32
S-
n
: Setting
Gn 32
S
-n U
/
C
Guard
I
SEF
32S CT Angle Comp
Gn 32
S-n Delay
32S-
n
General Pickup
En.
+W
-VAr
-W
-VAr
-W
+VAr
+
W
+VAr
Enabled
Inhibit
VT Fail
&
Gn 32
S-
n VTS
Action
Gn
32
S
-n Element
Inhibit
32S
-
n
&
Gn32
S:
Phase Selection
Gn32
S-n
: Operation
: Under
/Over
Figure 3-32 Logic Diagram: Sensitive Power Protection (32S)

Siemens 7SR12 Argus Specifications

General

Brand	Siemens
Model	7SR12 Argus
Category	Protection Device
Language	English