4.2.7.9 Technical data
Table 392: MFADPSDE Technical data
Characteristic
Value
Operation accuracy Depending on the frequency of the measured
voltage:
f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)
Typically 35 ms
Reset time Typically 40 ms
Operate time accuracy ±1.0% of the set value or ±20 ms
1) Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements
4.3 Unbalance protection
4.3.1 Negative-sequence overcurrent protection NSPTOC
4.3.1.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overcurrent
protection
NSPTOC I2> 46
4.3.1.2 Function block
A070758 V1 EN
Figure 205: Function block
4.3.1.3 Functionality
The negative-sequence overcurrent protection function NSPTOC is used for
increasing sensitivity to detect single-phase and phase-to-phase faults or unbalanced
loads due to, for example, broken conductors or unsymmetrical feeder voltages.
NSPTOC can also be used for detecting broken conductors.
1MRS758755 A Section 4
Protection functions
REC615 and RER615 395
Technical Manual
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