Phase-To-Phase Faults - ABB Relion 670 Series REL670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.4.3.1
98
The programming of the autorecloser function SMBRREC determines if three-phase
or single-phase trip is initiated as result of the test.
Keep the current constant when measuring operating characteristics. Keep the current
as close as possible to its rated value or lower. But make sure it is higher than the set
minimum operating current.
Ensure that the maximum continuous current in an IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
To verify the mho characteristic, at least two points should be tested.
In the following, three test points are proposed. The mho characteristic always goes
through the origin, which automatically gives a fourth point for the characteristic.

Phase-to-phase faults

X
3
IEC07000009 V4 EN
Figure 18: Proposed test points for phase-to-phase fault
Table 21: Test points for phase-to-phase (ohms / phase)
Test reach Value
points
1 X ZPP · sin(ZAngPP)
R ZPP · sin(ZAngPP)
2 X 0,5· (ZPP· sin(ZAngPP)
R 0,5·ZPP + ΔR = 0,5·ZPP·(1+cos(ZAngPP))
3 X 0,5·ZPP·sin(ZAngPP)
R 0,5·ZPP - ΔR = 0,5·ZPP(1-cos(ZAngPP))
1
ZPP
2
50%
ZAngPP
R
IEC07000009-4-en.vsd
Line distance protection REL670 2.1 IEC
1MRK 506 355-UEN A
Ohm/phase
Comments
Commissioning manual