4.1.2.11 Technical data
Table 256: 67/51P, 67/50P Technical data
Characteristic
Value
Operation accuracy Depending on the frequency of the current/voltage
measured: f
n
±2 Hz
67/51P
Current:
±1.5% of the set value or ±0.002 × I
n
Voltage:
±1.5% of the set value or ±0.002 × V
n
Phase angle: ±2°
67/50P
Current:
±1.5% of the set value or ±0.002 × I
n
(at currents in the range of 0.1…10 × I
n
)
±5.0% of the set value
(at currents in the range of 10…40 × I
n
)
Voltage:
±1.5% of the set value or ±0.002 × V
n
Phase angle: ±2°
Pickup time
1)2)
Minimum Typical Maximum
I
Fault
= 2.0 × set
Pickup
value
39 ms 43 ms 47 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 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 DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Measurement mode
and
Pol quantity
= default, current before fault = 0.0 × I
n
, voltage before fault = 1.0 ×
V
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 value
= 2.5 × I
n
,
Pickup value
multiples in range of 1.5...20
4.1.2.12 Technical revision history
Table 257: 67/50P Technical revision history
Technical revision
Change
B Added a new input NON_DIR
C Step value changed from 0.05 to 0.01 for the
Time
multiplier
setting.
D Monitored data VMEM_USED indicating voltage
memory use.
E Internal improvement.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 257
Technical Manual
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