ABB RELION REX640 Technical Manual page 908

Protection functions
Characteristic
Start time
Reset time
Operate time accuracy
Suppression of harmonics
4.5.9 Voltage vector shift protection VVSPPAM (ANSI 78VS)
4.5.9.1 Identification
Function description
Voltage vector shift protection
4.5.9.2 Function block
Figure 508: Function block
4.5.9.3 Functionality
The voltage vector shift protection function VVSPPAM, also known as vector surge
or delta phi function, measures continuously the duration of a voltage cycle. At the
instance of islanding, the duration of measured voltage cycle becomes shorter or
longer than the previous one, that is, the measured voltage cycle shifts with time.
This shifting of voltage is measured in terms of phase angle. VVSPPAM issues an
instantaneous trip when the shift in voltage vector exceeds the set value.
VVSPPAM can be blocked with BLOCK input. Blocking resets timers and outputs.
4.5.9.4 Analog channel configuration
VVSPPAM has one analog group input which must be properly configured.
Table 860: Analog inputs
Input
U3P
1
Number of Start phases = 1 out of 3, results based on statistical distribution of 1000
Tested for
measurements
2
Includes the delay of the signal output contact
908
1, 2
Value
Typically 40 ms
Based on maximum value of
setting
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
IEC 61850 IEC 60617
identification identification
VVSPPAM VS
Description
Three-phase voltages
1MRS759142 F
Recovery time
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
78VS
REX640
Technical Manual