ABB RELION REX640 Technical Manual page 858

Protection functions
4.5.1.11 Technical data
Table 789: PHPTOV Technical data
Characteristic
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite
time mode
Operate time accuracy in inverse
time mode
Suppression of harmonics
4.5.2 Three-phase undervoltage protection PHPTUV (ANSI 27)
4.5.2.1 Identification
Function description
Three-phase undervoltage protec-
tion
4.5.2.2 Function block
Figure 483: Function block
4.5.2.3 Functionality
The three-phase undervoltage protection function PHPTUV is used to disconnect
from the network devices, for example electric motors, which are damaged when
subjected to service under low voltage conditions. PHPTUV includes a settable value
1 Start value = 1.0 × U
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 Start value = 1.20 × U
Maximum
858
1, 2
U = 1.1 × set
Fault
Start value
, Voltage before fault = 0.9 × U
n
Start value multiples in range of 1.10...2.00
,
n
Value
Depending on the frequency of the measured voltage:
f ±2 Hz
n
±1.5% of the set value or ±0.002 × U
Minimum Typical
23 ms 27 ms
Typically 40 ms
Relative hysteresis
Depends on the set
<35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
IEC 61850 IEC 60617
identification identification
PHPTUV 3U<
, f = 50 Hz, overvoltage in one phase-to-
n n
1MRS759142 F
n
Maximum
31 ms
3
ANSI/IEEE C37.2
device number
27
REX640
Technical Manual