ABB RELION 670 Series Product Manual page 70

Transformer protection RET670 2.1 IEC
Table 39. Phase selection with load encroachment, quadrilateral characteristic FRPSPDIS
Function
Minimum operate current
Reactive reach, positive
sequence
Resistive reach, positive
sequence
Reactive reach, zero sequence
Resistive reach, zero sequence
Fault resistance, Ph-E faults,
forward and reverse
Fault resistance, Ph-Ph faults,
forward and reverse
Load encroachment criteria:
Load resistance, forward and
reverse
Safety load impedance angle
Reset ratio
70
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Range or value
(5-500)% of IBase
(0.50–3000.00) Ω/phase
(0.10–1000.00) Ω/phase
(0.50–9000.00) Ω/phase
(0.50–3000.00) Ω/phase
(1.00–9000.00) Ω/loop
(0.50–3000.00) Ω/loop
(1.00–3000.00) Ω/phase
(5-70) degrees
105% typically
Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
±2.0% static accuracy
±2.0 degrees static angular accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Angle: at 0 degrees and 85 degrees
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1MRK 504 155-BEN F
ABB