If the measurement of the operating characteristics runs under constant voltage
conditions, ensure that the maximum continuous current in an IED does not exceed
four times its rated value.
Verifying mho offset characteristic
GUID-03EB19A6-A130-41E8-A8FF-D47C38BCF931 v2
To verify zone 1 mho offset characteristic, at least two points must be tested.
P1
P3
P4
jX (Ω)
ImpCharAng
ZxFwd
ZxRev
P2
IEC15000198-2-en.vsdx
R (Ω)
IEC15000198 V2 EN-US
Figure 22: Commissioning test points for mho offset characteristic
Where,
ZxFwd
is the forward positive sequence impedance setting for zone x (where, x is 1- 3
depending on the zone selected)
ZxRev
is the reverse positive sequence impedance setting for zone x (where, x is 1- 3
depending on the zone selected)
ImpCharAng
is the impedance angle in deg
Test points X R
P1
ZxFwd
· sin(
ImpCharAng
)
ZxFwd
· cos(
ImpCharAng
)
P2 ((
ZxFwd
-
ZxRev
) / 2) · sin(
ImpCharAng
)
ZxFwd
/ 2 · (1 + cos(
ImpCharAng
)) +
ZxRev
/ 2 · (1 – cos(
ImpCharAng
))
P3 ((
ZxFwd
-
ZxRev
) / 2) · sin(
ImpCharAng
) -
ZxFwd
/ 2 · (1 – cos(
ImpCharAng
)) -
ZxRev
/ 2 · (1 + cos(
ImpCharAng
))
P4 -
ZxRev
· sin(
ImpCharAng
) -
ZxRev
· cos(
ImpCharAng
)
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
102 Railway application RER670 2.2 IEC
Commissioning manual
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