ABB REB500 - Page 51

1MRK 505 353-UEN Section 6
BP-Additions to base documentation
Application Manual 43
Bay protection functions REB500
Table 50 Directional overcurrent inverse time protection 67 (PTOC)
Function/ Parameter Range/ Value
• Current
0.02 to 20 I
N
in steps of 0.01 I
N
• Angle -180° to +180° in steps of 15°
Inverse time characteristic
(acc. to B.S. 142, IEC 60255-3 with extended setting range):
• normal inverse
• very inverse
• extremely inverse
• long time inverse
t = k
1
/ ((I/I
B
)
C
- 1)
• c = 0.02
• c = 1
• c = 2
• c = 1
• t-min 0 to 20 in steps of 0.01
• IB-value
0.04 to 2.5 I
N
in steps of 0.01 I
N
• Wait time
0.02 to 20 s in steps of 0.01 s
• Memory duration
0.2 to 60 s in steps of 0.01 s
• Voltage input range
0.005 to 2 U
N
• Voltage memory range
<0.005 U
N
•
Response time without delay
60 ms
· Directional overcurrent protection with detection of power flow direction
· Back-up protection
· 4 independent parameter sets
· Three-phase measurement
· Suppression of DC and HF components
· Inverse time characteristic
· Voltage memory for near faults
· Selectable response when power direction no longer valid (trip or block)