ABB RELION 670 Series Technical Manual page 510

Section 8
Current protection
Function
Minimum trip current, step 1
- 4
Relay characteristic angle
(RCA)
Trip current for directional
release
Minimum polarizing voltage
Minimum polarizing current
Real part of negative
sequence source impedance
used for current polarization
Imaginary part of negative
sequence source impedance
used for current polarization
Trip time, pickup non-
directional at 0 to 2 x I
Reset time, pickup non-
directional at 2 to 0 x I
Trip time, pickup non-
directional at 0 to 10 x I
Reset time, pickup non-
directional at 10 to 0 x I
Critical impulse time
Impulse margin time
Transient overreach
8.6 Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
8.6.1 Identification
Function description
Sensitive directional residual over
current and power protection
8.6.2 Functionality
In networks with high impedance grounding, the phase-to-ground fault current is significantly
smaller than the short circuit currents. Another difficulty for ground fault protection is that the
504
Range or value
(1.00 - 10000.00)% of
(-180 to 180) degrees
IBase
(1–100)% of
VBase
(1–100)% of
(2-100)% of IBase
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
Min. = 15 ms
Max. = 30 ms
set
Min. = 15 ms
Max. = 30 ms
set
Min. = 5 ms
Max. = 20 ms
set
Min. = 20 ms
Max. = 35 ms
set
10 ms typically at 0 to 2 x I
15 ms typically
<10% at τ = 100 ms
IEC 61850
identification
SDEPSDE
IBase
set
IEC 60617 ANSI/IEEE C37.2
identification device number
- 67N
1MRK 502 066-UUS B
Accuracy
±1.0% of I at I ≤ I
n n
±1.0% of I at I > I
n
±2.0 degrees
For RCA ±60 degrees:
±2.5% of I at I ≤ I
n n
±2.5% of I at I > I
n
±0.5% of V
n
±1.0% of I
n
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SEMOD171436-1 v4
SEMOD172025-2 v4
SEMOD171959-4 v11
Technical manual