Characteristic Value
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
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Residual voltage before fault = 0.0 × V
n
, f
n
= 50 Hz, residual voltage 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 Negative-sequence overvoltage protection 47
4.5.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overvoltage
protection
NSPTOV U2> 47
4.5.4.2 Function block
GUID-CDC32940-936F-4DC6-8E78-1F4D7965EA96-ANSI V1 EN
Figure 315: Function block
4.5.4.3 Functionality
The negative-sequence overvoltage protection function 47 is used to detect negative-
sequence overvoltage conditions. 47 is used for the protection of machines.
he function picks up when the negative-sequence voltage exceeds the set limit. 47 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.
4.5.4.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are “Enable” and “Disable”.
Section 4 1MAC059074-MB A
Protection functions
632 615 series ANSI
Technical Manual
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