Hitachi RER670 Commissioning Manual page 104

Section 10
Testing functionality by secondary injection
IEC15000198 V2 EN-US
Figure 26:
Where,
ZxFwd
ZxRev
ImpCharAng
Test points
P1
P2
P3
P4
1. Change the magnitude and angle of the voltage to achieve impedances at test points P1, P2, P3
and P4.
2. For each test point, check that the output signals START and STZx (where, x is 1- 3 depending
on the zone selected) are activated.
3. Signals TRIP and TRZx will be activated after operate time delay tZx for the respective zone has
elapsed.
Verifying quadrilateral characteristic
To verify zone quadrilateral characteristic, at least 10 points must be tested.
98
jX (Ω)
P3
ImpCharAng
ZxRev
P4
Commissioning test points for mho offset characteristic
is the forward positive sequence impedance setting for zone x (where, x is 1- 3 depending
on the zone selected)
is the reverse positive sequence impedance setting for zone x (where, x is 1- 3 depending
on the zone selected)
is the impedance angle in deg
X
ZxFwd · sin(ImpCharAng)
((ZxFwd -ZxRev) / 2) · sin(ImpCharAng)
((ZxFwd -ZxRev) / 2) · sin(ImpCharAng)
-ZxRev · sin(ImpCharAng)
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P1
ZxFwd
P2
R (Ω)
IEC15000198-2-en.vsdx
R
ZxFwd · cos(ImpCharAng)
ZxFwd / 2 · (1 + cos(ImpCharAng)) + ZxRev / 2
· (1 – cos(ImpCharAng))
-ZxFwd / 2 · (1 – cos(ImpCharAng)) - ZxRev / 2
· (1 + cos(ImpCharAng))
-ZxRev · cos(ImpCharAng)
1MRK 506 377-UEN Rev. L
GUID-12731067-DB7D-4FEB-9529-40016BAC3159 v2
Railway application RER670
Commissioning manual