Moving Average Voltage Functions; Moving Average Undervoltage Logic; Figure 109: Moving Average Undervoltage Logic - GE MiCOM P40 Agile Technical Manual

Chapter 10 - Voltage Protection Functions
9

MOVING AVERAGE VOLTAGE FUNCTIONS

Moving average voltage functions are available for:
Undervoltage (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
9.1

MOVING AVERAGE UNDERVOLTAGE LOGIC

Vavg<1 Status
VA Mov Average
Vavg<1 Volt Set
Vavg<1 TripTime
Vavg<1 StrtTime
Vavg<1 Status
VB Mov Average
Vavg<1 Volt Set
Vavg<1 TripTime
Vavg<1 StrtTime
Vavg<1 Status
VC Mov Average
Vavg<1 Volt Set
Vavg<1 TripTime
Vavg<1 StrtTime
Vavg< Inhibit
V Blocking 1
Enabled
VTS Fast Block
Vavg< Oper Mode
Any Phase
Three Phase

Figure 109: Moving Average undervoltage logic

208
&
&
&
&
Vavg<1 Start A
Vavg <1 Trip A
Vavg<1 Start B
Vavg <1 Trip B
Vavg<1 Start C
Vavg <1 Trip C
1
&
1
Vavg<1 Start
&
&
1
&
1
Vavg<1 Trip
&
&
V00807
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