ABB 615 Series - Voltage Variation PQSS

10.3 Voltage variation PQSS
10.3.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage variation PHQVVR PQMU
PQ 3U<>
PQSS
10.3.2 Function block
PQSS
I_A
I_B
I_C
V_A
V_B
V_C
BLOCK
TRIP
PICKUP
SWELLST
INPRO
INTST
GUID-104C1E22-E049-49E3-BC03-0DDA916FC4CF V1 EN
Figure 529: Function block
10.3.3 Functionality
The voltage variation function PQSS is used for measuring the short-duration voltage
variations in distribution networks.
Power quality in the voltage waveform is evaluated by measuring voltage swells, dips and
interruptions. PQSS includes single-phase and three-phase voltage variation modes.
Typically, short-duration voltage variations are defined to last more than half of the
nominal frequency period and less than one minute. The maximum magnitude (in the case
of a voltage swell) or depth (in the case of a voltage dip or interruption) and the duration
of the variation can be obtained by measuring the RMS value of the voltage for each phase.
International standard 61000-4-30 defines the voltage variation to be implemented using
the RMS value of the voltage. IEEE standard 1159-1995 provides recommendations for
monitoring the electric power quality of the single-phase and polyphase ac power systems.
PQSS contains a blocking functionality. It is possible to block a set of function outputs or
the function itself, if desired.
1MAC059074-MB A Section 10
Power quality measurement functions
615 series ANSI 1041
Technical Manual