4.1.3.9 Technical data
Table 266: 51V Technical data
Characteristic
Value
Operation accuracy Depending on the frequency of the measured
current and voltage:
f
n
±2 Hz
Current:
±1.5% of the set value or ± 0.002 × I
n
Voltage:
±1.5% of the set value or ±0.002 × V
n
Pickup time
1)2)
Typically 26 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
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 set value or ±20 ms
Suppression of harmonics -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Measurement mode
= default, current before fault = 0.0 × 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
4.1.4 Three-phase thermal protection for feeders, cables and
distribution transformers 49F
4.1.4.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase thermal protection for
feeders, cables and distribution
transformers
T1PTTR
3Ith>F 49F
Section 4 1MAC059074-MB A
Protection functions
268 615 series ANSI
Technical Manual
To Next Page
Loading...
