Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 175/220
5.
NEW ADDITIONAL FUNCTIONS – VERSION B1.X
5.1
Maximum of Residual Power Protection – Zero Sequence Power Protection
5.1.1 Function
description
The aim of protection is to provide the system with selective and autonomous protection
against resistive Phase to ground faults. High resistive faults such as vegetation fires cannot
be detected by distance protection.
When a phase to ground fault occurs, the fault can be considered as a zero-sequence power
generator. Zero-sequence voltage is at maximum value at the fault point. Zero-sequence
power is, therefore, also at maximum value at the same point. Supposing that zero-
sequence current is constant, zero-sequence power will decrease along the lines until null
value at the source’s neutral points (see below).
Z
os1
x . Z
ol
(1-x).Z
ol
Z
os2
P
A
P
B
P3100XXa
With:
Zos1:
Zero-sequence source side 1 impedance of
Zol:
Zero-sequence line impedance
Zos2: Zero-sequence source side2 impedance of
x:
Distance to the fault From PA
P
o
V
o
1
0,5
0
1
0,5
0
P
A
P
B
Fault
P3101ENa
Selective fault clearance of the protection for forward faults is provided by the power
measurement combined with a time-delay inversely proportional to the measured power.
The protection does not send any trip commands for reverse faults.
In compliance with sign conventions (the zero-sequence power flows from the fault towards
the sources) and with a mean characteristic angle of the zero-sequence source impedances
of the equal to 75°, the measured power is determined by the following formula:
Sr = Vr
r.m.s
x Ir
r.m.s
x cos(
ϕ
-
ϕ
0
)
With:
ϕ
:
Phaseshift between Vr and Ir
ϕ
0
:
255° or – 75°
Vr
r.m.s
, Ir
r.m.s
:
R.M.S values of the residual voltage and current
The Vr and Ir values are filtered in order to eliminate the effect of the 3
rd
and 5
th
harmonics.
Содержание MiCOM P441
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