Technical Data; Directional Earth-Fault Protection 67/51N And 67/50N; Identification - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.4.11
4.1.5
4.1.5.1
198

Technical data

Table 152: 51N/G, 50N/G-1/2 & 50N/G-3 Technical data
Characteristic
51N/G
50N-1/2 & 50G-1/2
and
50N/G-3
1)2)
Pickup time
50N/G-3:
I = 2 × set Pickup value
Fault
I = 10 × set Pickup value
Fault
50N-1/2 & 50G-1/2 and
51N/G:
I = 2 × set Pickup value
Fault
Reset time
Reset ratio
Retardation time
Trip time accuracy in definite time mode
Trip time accuracy in inverse time mode
Suppression of harmonics
Measurement mode = default (depends on stage), current before fault = 0.0 × I
1)
current with nominal frequency injected from random phase angle, results based on statistical distribution of
1000 measurements
2) Includes the delay of the signal output contact
Pickup value = 2.5 × I
3) Maximum

Directional earth-fault protection 67/51N and 67/50N

Identification

Function description
Directional earth-fault protection, low
stage
Directional earth-fault protection, high
stage
Value
±1.5% of the set value or ±0.002 × I
±1.5% of set value or ±0.002 × I
(at currents in the range of 0.1...10 × I
±5.0% of the set value
(at currents in the range of 10...40 × I
Minimum
15 ms
12 ms
23 ms
<40 ms
Typically 0.96
<30 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
RMS: No suppression
DFT: -50 dB at f = n × f
Peak-to-Peak: No suppression
Pickup value multiples in range of 1.5...20
,
n
IEC 61850 IEC 60617
identification identification
DEFLPDEF1 I0> ->(1)
DEFHPDEF1 I0>> ->(1)
DEFHPDEF2 I0>> ->(2)
1MAC504801-IB E
n
n
)
n
)
n
Typical Maximum
16 ms 17 ms
13 ms 14 ms
25 ms 28 ms
3)
, where n = 2, 3, 4, 5,...
n
, f = 60 Hz, ground-fault
n n
ANSI/IEEE C37.2
device number
67/51N
67/50N-1
67/50N-2
620 series ANSI
Technical Manual