ABB RET670 Product Manual page 56

Transformer protection RET670
Pre-configured
Product version: 1.1
Table 29. Phase selection with load encroachment, quadrilateral characteristic
Function
Minimum operate current
Reactive reach, positive
sequence , forward and
reverse
Resistive reach, positive
sequence
Reactive reach, zero
sequence, forward and
reverse
Resistive reach, zero
sequence
Fault resistance, phase-to-
earth faults, forward and
reverse
Fault resistance, phase-to-
phase faults, forward and
reverse
Load encroachment
criteria:
Load resistance, forward
and reverse
Safety load impedance
angle
Reset ratio
Table 30. Faulty phase identification with load encroachment FMPSPDIS
Function
Minimum operate current
Load encroachment
criteria: Load resistance,
forward and reverse
56
Range or value
(5-30)% 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
Range or value
(5-30)% of IBase
(0.5–3000) W/phase
(5–70) degrees
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
± 1.0% of IBase
± 2.0% static accuracy
± 2.0 degrees static angular accuracy
Conditions:
Voltage range: (0.1-1.1) x UBase
Current range: (0.5-30) x IBase
Angle: at 0 degrees and 85 degrees
-
Accuracy
± 1.0% of I
r
± 2.0% static accuracy
Conditions:
Voltage range: (0.1–1.1) x U
Current range: (0.5–30) x I
Angle: at 0 degrees and 85
degrees
n
n
ABB