GE P24DM - Moving Average Voltage Functions; Moving Average Undervoltage Logic; Figure 106: Moving Average Undervoltage Logic

8 MOVING AVERAGE VOLTAGE FUNCTIONS
Moving average voltage functions are available for:
● Under
voltage (Vavg<)
● Overvoltage (Vavg>)
● Zero Sequence Voltage (V0avg>)
● Positive Sequence Voltage (V1Avg>)
● Negative Sequence Voltage (V2Avg>)
The voltage is sampled at 5 Hz (one sample every 200 ms for a 50 Hz system). The refresh period is 3 seconds,
meaning 15 samples are collected every refresh period. The average voltage for the previous 10 minutes is
calculated, displayed as measurements and used as energising quantities for the protection functions. The
folllowing quantities are provided:
VA Mov Average: A-phase RMS average voltage
VB Mov Average: B-phase RMS average voltage
VC Mov Average: C-phase RMS average voltage
V0 Mov Average: Zero Sequence average voltage magnitude
V1 Mov Average: Positive Sequence average voltage magnitude
V2 Mov Average: Negative Sequence average voltage magnitude
8.1 MOVING AVERAGE UNDERVOLTAGE LOGIC
V00807
Vavg<1 Volt Set
Vavg <1 Status
Vavg<1 StrtTime
Vavg<1 TripTime
Vavg <1 Trip A
Vavg<1 Start A
&
1
&
&
&
1
&
&
1
1
Vavg<1 Start
Vavg <1 Trip
Vavg< Oper Mode
Any Phase
Three Phase
Vavg<1 Volt Set
Vavg <1 Status
Vavg<1 StrtTime
Vavg<1 TripTime
Vavg <1 Trip B
Vavg<1 Start B
Vavg<1 Volt Set
Vavg <1 Status
Vavg<1 StrtTime
Vavg<1 TripTime
Vavg <1 Trip C
Vavg<1 Start C
VA Mov Average
VB Mov Average
VC Mov Average
VTS Fast Block
&
&
&
&
V Blocking 1
Enabled
Vavg< Inhibit
Figure 106: Moving Average undervoltage logic
Chapter 10 - Voltage Protection Functions P24xM
218 P24xM-TM-EN-2.1