Characteristic Value
Reset ratio Typical 0.96
Retardation time < 35 ms
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,…
1) Negative-sequence voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, negative-sequence overvoltage 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
4.5.4.10 Technical revision history
Table 414: NSPTOV Technical revision history
Technical revision Change
B Internal change
4.5.5 Positive-sequence undervoltage protection PSPTUV
4.5.5.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Positive-sequence undervoltage
protection
PSPTUV U1< 47U+
4.5.5.2 Function block
GUID-24EBDE8B-E1FE-47B0-878B-EBEC13A27CAC V1 EN
Figure 258: Function block
4.5.5.3 Functionality
The positive-sequence undervoltage protection 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.
1YHT530004D05 D Section 4
Protection functions
615 series 489
Technical Manual
To Next Page
Loading...
Need help?
General
