Technical Data - ABB 615 series Technical Manual

Section 4
Protection functions
4.5.6.10
4.5.7
4.5.7.1
4.5.7.2
4.5.7.3
658

Technical data

Table 564: 24 Technical data
Characteristic
Operation accuracy
1)2)
Pickup time
Reset time
Reset ratio
Retardation time
Trip time accuracy in definite-time mode
Trip time accuracy in inverse-time mode
1) f = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the signal output contact
Low-voltage ride-through protection 27RT
Identification
Function description
Low-voltage ride-through protection
Function block
27RT
V_A_AB
TRIP
V_B_BC PICKUP
V_C_CA
V
1
BLOCK
GUID-64E07123-ED63-4775-893C-F3575ED1F7F6 V1 EN
Figure 327: Function block
Functionality
The low-voltage ride-through protection function 27RT is principally a three-phase
undervoltage protection. It differs from the traditional three-phase undervoltage
Value
Depending on the frequency of the measured
current: f ±2 Hz
n
±3.0% of the set value
Frequency change:
Typically 200 ms
Voltage change:
Typically 40 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±50 ms
IEC 61850 IEC 60617
identification identification
LVRTPTUV U<RT
1MAC059074-MB A
ANSI/IEEE C37.2
device number
27RT
615 series ANSI
Technical Manual