4.5.6.10 Technical data
Table 564: 24 Technical data
Characteristic
Value
Operation accuracy Depending on the frequency of the measured
current: f
n
±2 Hz
±3.0% of the set value
Pickup time
1)2)
Frequency change:
Typically 200 ms
Voltage change:
Typically 40 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 ±50 ms
1) f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
4.5.7 Low-voltage ride-through protection 27RT
4.5.7.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Low-voltage ride-through protection LVRTPTUV U<RT 27RT
4.5.7.2 Function block
V_A_AB
V_B_BC
V_C_CA
27RT
TRIP
BLOCK
PICKUP
V
1
GUID-64E07123-ED63-4775-893C-F3575ED1F7F6 V1 EN
Figure 327: Function block
4.5.7.3 Functionality
The low-voltage ride-through protection function 27RT is principally a three-phase
undervoltage protection. It differs from the traditional three-phase undervoltage
Section 4 1MAC059074-MB A
Protection functions
658 615 series ANSI
Technical Manual
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