Characteristic Value
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.5.6.10 Technical revision history
Table 628: 47 Technical revision history
Technical revision Change
B Internal change
C Internal improvement.
D Internal improvement.
4.5.7 Positive-sequence undervoltage protection PSPTUV
4.5.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Positive-sequence undervoltage
protection
PSPTUV U1< 47U+
4.5.7.2 Function block
Figure 347: Function block
4.5.7.3 Functionality
The positive-sequence undervoltage protection function PSPTUV is used to detect
positive-sequence undervoltage conditions. PSPTUV is used for the protection of
small power generation plants. The function helps in isolating an embedded plant
from a fault line when the fault current fed by the plant is too low to start an
overcurrent function but high enough to maintain the arc. Fast isolation of all the
fault current sources is necessary for a successful autoreclosure from the network-
end circuit breaker.
The function starts when the positive-sequence voltage drops below the set limit.
PSPTUV operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself, if desired.
Protection functions
1MRS757644 H
668 620 series
Technical Manual
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