ABB RELION Series Technical Manual page 500

Section 5
Protection related functions
494
Table 516: Positive-sequence impedance values for typical 10/20 kV conductors, "Flat" tower
configuration assumed
Name
Al/Fe 36/6 Sparrow
Al/Fe 54/9 Raven
Al/Fe 85/14 Pigeon
Al/Fe 93/39 Imatra
Al/Fe 108/23 Vaasa
Al/Fe 305/39 Duck
Table 517: Positive-sequence impedance values for typical 33 kV conductors, "Flat" tower
configuration assumed
Name
ACSR 50 sq.mm
ACSR 100 sq.mm
ACSR 500 sq.mm
Zero-sequence impedance values
Location of earth faults requires both positive-sequence and zero-sequence
impedances. For short circuit faults, zero-sequence impedances are not required.
The positive-sequence impedance per unit values for the lines are typically known or
can easily be obtained from data sheets. The zero-sequence values are generally not as
easy to obtain as they depend on the actual installation conditions and configurations.
Sufficient accuracy can, however, be obtained with rather simple calculations using
the following equations, which apply per phase for symmetrically transposed three-
phase aluminium overhead lines without ground wires.
R [ 50 Hz ] R 1 0 14804 . [ /
≈ + Ω
0
GUID-087D1F51-4C8C-4CF4-ACE5-9F43AF0DD3FC V1 EN
R [ 60 Hz ] R 1 0 17765 . [ /
≈ + Ω
0
GUID-C33EC003-0DA2-4FFC-9496-586D7342DAF6 V1 EN
w

4
−
X 2 10 3 ln
≈ ⋅ ω ⋅ ⋅ +

0 n
r

en
GUID-6850481D-094B-4FA0-9E73-39DCC6C49BCC V2 EN
R conductor AC resistance [Ω/km]
1
R1 [Ω/km]
0.915
0.578
0.364
0.335
0.287
0.103
R1 [Ω/km]
0.529
0.394
0.0548
km ]
km ]

0 25 . [ / km ]
Ω


1MRS758755 A
X1 [Ω/km]
0.383
0.368
0.354
0.344
0.344
0.314
X1 [Ω/km]
0.444
0.434
0.346
(Equation 60)
(Equation 61)
(Equation 62)
REC615 and RER615
Technical Manual