Power Protection: Power Factor (55); Figure 3-29 Logic Diagram: Power Factor Protection (55) - Siemens 7SR10 Argus Series Manual

3.4.15

Power Protection: Power Factor (55)

Two power factor elements are provided.
Gn 55-n Setting sets the pick-up power factor of the element.
Under-power factor or over-power factor operation can be set by the Gn 55-n Operation setting.
Gn 55-n 1ph/3ph Power allows the settings to be based on any one phase power factor or the average power
factor of all three phases.
An output is given after elapse of the Gn 55-n Delay setting.
Operation of the power factor elements can be inhibited when:
The measured current is below the Gn 55 U/C Guard setting
A VT Fail condition is detected
Inhibit 55-n
Gn 55-n Element
Enabled
Gn 55-n VTS
Action
Inhibit
VT Fail
Inhibit 55-n
Gn 55-n U/C
Guarded
Enabled
Gn 55-n U/C Guard
Setting
<
<
<
I
L1
I
L2
I
L3
V
1
V
2
V
3
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A binary or virtual input.
&
&
&

Figure 3-29 Logic Diagram: Power Factor Protection (55)

Gn55-n: Operation: Under/Over
Gn55-n: 1ph/3ph Power
Gn55-n: Dir. Control
Gn55-n: Setting
En.
&
-W +W
-VAr -VAr
-W +W
+VAr +VAr
7SR10 Description of Operation
Gn 55-n Delay
55-n
General Pickup
Chapter 1 Page 50 of 77