Voltage variation measurement can be done to the phase-to-ground and phase-to-phase
voltages. The power quality standards do not specify whether the measurement should be
done to phase or phase-to-phase voltages. However, in some cases it is preferable to use
phase-to-ground voltages for measurement. The measurement mode is always TRMS.
8.3.7
Signals
Table 350:
PQSS Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
V_A
SIGNAL
0
Phase A voltage
V_B
SIGNAL
0
Phase B voltage
V_C
SIGNAL
0
Phase C voltage
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
Table 351:
PQSS Output signals
Name
Type
Description
TRIP
BOOLEAN
Voltage variation detected
PICKUP
BOOLEAN
Voltage variation present
SWELLST
BOOLEAN
Voltage swell active
DIPST
BOOLEAN
Voltage dip active
INTST
BOOLEAN
Voltage interruption active
8.3.8
Settings
Table 352:
PQSS Group settings
Parameter
Values (Range)
Unit
Step
Default
Description
Reference voltage
10.0...200.0
%Un
0.1
57.7
Reference supply voltage in %
Voltage dip set 1
10.0...100.0
%
0.1
80.0
Dip limit 1 in % of reference voltage
VVa dip time 1
0.5...54.0
cycles
0.1
3.0
Voltage variation dip duration 1
Voltage dip set 2
10.0...100.0
%
0.1
80.0
Dip limit 2 in % of reference voltage
VVa dip time 2
10.0...180.0
cycles
0.1
30.0
Voltage variation dip duration 2
Voltage dip set 3
10.0...100.0
%
0.1
80.0
Dip limit 3 in % of reference voltage
VVa dip time 3
2000...60000
ms
10
3000
Voltage variation dip duration 3
Voltage swell set 1
100.0...140.0
%
0.1
120.0
Swell limit 1 in % of reference voltage
Table continues on next page
1MRS240050-IB C
Section 8
Power quality measurement functions
REF615R
435
Technical Manual
Summary of Contents for RELION REF615R
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