P44x/EN AP/E33
Application Notes
Page 26/220
MiCOM P441/P442 & P444
Typical figures for R
a
are given in Table 1 below, for different values of minimum expected
phase fault current.
Conductor
spacing (m)
Typical system
voltage (kV)
I
f
= 1kA
I
f
= 5kA
I
f
= 10kA
2 33 3.6
Ω
0.4
Ω
0.2
Ω
5 110 9.1
Ω
1.0
Ω
0.4
Ω
8 220 14.5
Ω
1.5
Ω
0.6
Ω
TABLE 1 - TYPICAL ARC RESISTANCES CALCULATED USING THE VAN WARRINGTON FORMULA
The maximum phase fault resistive reach must be limited to avoid load encroachment trips.
Thus, R3Ph and other phase fault resistive reach settings must be set to avoid the heaviest
allowable loading on the feeder. An example is shown in Figure 3 below, where the worst
case loading has been determined as point “Z”, calculated from:
Impedance magnitude,
Z
=
kV
2
/ MVA
Leading phase angle,
∠
Z =
cos
–1
(PF)
Where:
kV
=
Rated line voltage (kV);
MVA
=
Maximum loading, taking the short term overloading during out ages of
parallel circuits (MVA);
PF
=
Worst case lagging power factor.
P0475ENa
R3PG-R4PG
Zone 3
Zone 4
LOAD
R
∆
Z
FIGURE 4 - RESISTIVE REACHES FOR LOAD AVOIDANCE
As shown in the Figure, R3Ph-R4Ph is set such as to avoid point Z by a suitable margin.
Zone 3 must never reach more than 80% of the distance from the line characteristic
impedance (shown dotted), towards Z. However, where power swing blocking is used, a
larger impedance (including
∆
R) characteristic surrounds zones 3 and 4, and it is essential
also that load does not encroach upon this characteristic. For this reason, R3Ph would be
set
≤
60% of the distance from the line characteristic impedance towards Z. A setting
between the calculated minimum and maximum should be applied.
R/Z ratio: For best zone reach accuracy, the resistive reach of each zone would not normally
be set greater than 10 times the corresponding zone reach. This avoids relay overreach or
underreach where the protected line is exporting or importing power at the instant of fault
inception. The resistive reach of any other zone cannot be set greater than R3Ph, and
where zone 4 is used to provide reverse directional decisions for Blocking or Permissive
Overreach schemes, the zone 2 elements used in the scheme must satisfy R2Ph
≤
(R3Ph-
R4Ph) x 80%.
Содержание MiCOM P441
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