Sensitive Power Logic; Application Notes; Sensitive Power Calculation; Figure 139: Sensitive Power Logic Diagram - GE MiCOM P40 Agile Technical Manual

P14x
4.3

SENSITIVE POWER LOGIC

Aph Sen Watts
Sens P >1 Setting
Aph Sen Watts
Sens -P>1Setting
Aph Sen Watts
Sens P <1 Setting
Aph Sens Power
Enabled
Sens P 1 Function
Over
Reverse
Low Forward
Disabled
P1 Poledead Inh
Enabled
VTS Slow Block
V00902

Figure 139: Sensitive Power logic diagram

4.4

APPLICATION NOTES

4.4.1

SENSITIVE POWER CALCULATION

Input Quantities
Sensitive power is calculated from the A-phase-neutral voltage and the A-phase sensitive current input.
The calculation for active power with the correction angle is:
=
P I V cos(
A AS A
where:
P = sensitive power
●
A
V = A-phase voltage
●
A
I = A-phase sensitive current
●
AS
Φ= the angle of I
●
AS
θ = the CT correction angle
●
C
Calculations within the device are based upon quadrature components obtained from the Fourier analysis of the
input signals. The quadrature values for V
P14xEd1-TM-EN-1
1
ϕ θ
−
)
C
with respect to V
A
and I
A AS
& 1
&
&
Note: This diagram does not show all stages . Other stages follow similar principles.
It also does not show all phases . Other phases follow similar principles.
are used for the sensitive power calculation as shown:
Chapter 12 - Power Protection Functions
DT
Sens P 1 Delay
SensP 1 Start A
SensP 1 Trip A
267