Impedance protection
Table 26. Power swing detection ZMRPSB
Function
Range or value
Accuracy
Reactive reach
(0.10-3000.00)
W
/phase
± 2.0% static 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
Resistive reach
(0.10–1000.00)
W
/phase
Timers
(0.000-60.000) s
± 0.5% ± 10 ms
Minimum operate current
(5-30)% of IBase
± 1.0% of I
r
Table 27. Underimpedance protection for generators and transformers ZGCPDIS
Function
Range or value
Accuracy
Number of zones
3
-
Forward positive sequence impedance
(0.005-3000.000) Ω/
phase
± 2.0% static accuracy
Conditions:
• Voltage range: (0.1-1.1) x U
r
• Current range: (0.5-30) x I
r
• Angle: at 85 degrees
Reverse positive sequence impedance
(0.005-3000.000) Ω/
phase
-
Angle for positive sequence impedance,
(10-90) degrees
-
Timers
(0.000-60.000) s
± 0.5% ± 10 ms
Operate time
25 ms typically
-
Reset ratio
105% typically
-
Table 28. Load enchroachment LEPDIS
Function
Range or value
Accuracy
Load encroachment criteria:
Load resistance, forward and
reverse
Safety load impedance angle
(1.00–3000.00) Ω/phase
(5-85) degrees
± 5.0% 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
Reset ratio
105% typically
-
Transformer protection RET650
1MRK 504 137-BEN B
Product version: 1.3
40
ABB
