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R E R6 20
A DVA N C ED R EC LOSER P R OT EC T I O N & CO N T R O L
Protection functions
—
Table 23. 51P/50P technical data
Description
Value
Depending on the frequency of the current measured: f
n
±2Hz
Operation accuracy
51P
±1.5% of the set value or ±0.002 x I
n
50P-1, 50P-2
and
50P-3
±1.5% of set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Pickup time
1) 2)
Minimum
Typical
Maximum
50P-3:
I
Fault
= 2 x set Pickup value
I
Fault
= 10 x set Pickup value
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
51P and 50P-1/2:
I
Fault
= 2 x set Pickup range
22ms
24 ms
25 ms
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 30 ms
Trip time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Trip time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3)
Suppression of harmonics
RMS: No suppression DFT: -50dB at f =
n x f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
1)
Set Operate delay time = 0,02 s, Operate curve type = ANSI definite time, Measurement mode = default (depends on stage), current before fault = 0.0 x I
n
, f
n
= 50 Hz, fault current in
one phase 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
3)
Maximum Pickup range = 2.5 x I
n
, Pickup range multiples in range of 1.5 to 20
