ABB RELION REB500 Technical Manual page 49

1MRK 505 406-UEN B
The impedance characteristic is defined independently for each of the four distance zones
(Zone 4 is used alternatively for the overreaching zone) by the following parameters (i = 1 to 4):
X — (i)
•
R — (i)
•
RR — (i)
•
RRE — (i)
•
k0 — (i)
•
• k0Ang — (i)
Delay — (i)
•
IEC19000410 V1 EN-US
Figure 9:
Impedance setting ranges:
• X -10 to 20 Ω/phase in steps of 0.01
R -300 to 300 Ω/phase in steps of 0.01
•
RR -10 to 15 Ω/phase in steps of 0.01
•
RRE -10 to 15 Ω/phase in steps of 0.01
•
When X of a zone is set to zero, regardless of the settings of its other parameters, this zone
and all following zones with the exception of the final zone are blocked. For example if zone X
(3) is set to zero, zones 3 and 4 are blocked. If in the present example the user wants to block
just zone 3, this can be achieved indirectly by setting zone 3 to all the settings determined for
zone 4 and blocking zone 4 by setting X (4) = 0 (that is, zone 3 functions as zone 4). Zone 1 can
only be disabled by the parameter
The direction of measurement is reversed for negative settings of
Allowing for arc resistance:
Bay protection functions REB500
Technical manual
X
27°
X
- X/8 R
-RR/2
-RRE/2
Distance measuring characteristic
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14°
RR RRE
27°
18000008-IEC19000410-1-en.vsdx
Block Z1 or the binary input ExtBlock Z1.
Bay protection functions
7°
R
X , R , RR and RRE .
Section 5
43