4.5.7.8 Monitored data
Table 570: 27RT Monitored data
Name
Type Values (Range) Unit Description
27RT Enum 1=Enabled
2=blocked
3=test
4=test/blocked
5=Disabled
Status
4.5.7.9 Technical data
Table 571: 27RT 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 × V
n
Pickup time
1)2)
Typically 40 ms
Reset time Based on maximum value of
Recovery time
setting
Trip time accuracy ±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) Tested for
Num of pickup phases
= 1 out of 3, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
4.5.8 Voltage vector shift protection 78V
4.5.8.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage vector shift protection VVSPPAM VS 78V
4.5.8.2 Function block
V_A_AB
V_B_BC
V_C_CA
BLOCK
TRIP
78V
INT_BLKD
GUID-87689571-BB05-4911-B2A9-23CCC8EA665C V1 EN
Figure 333: Function block
Section 4 1MAC059074-MB A
Protection functions
666 615 series ANSI
Technical Manual
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