Program features 19
Sliding overvoltage
Sliding overvoltage implements monitoring for a slowly rising AC voltage. A ten minute
average value is calculated and compared against the limit. Each phase/main voltage is
independently monitored. The duration for the tolerated overvoltage situation can be set
with parameter135.77 Sliding overvoltage time.
Settings
Parameters:135.75 Sliding overvoltage enable,135.76 Sliding overvoltage limit,135.77
Sliding overvoltage time
Frequency monitoring
There are six limits for underfrequency and four limits for overfrequency monitoring. All
limits have an enable parameter, limit parameter, and time parameter. When limit is
enabled and measured value exceeds the limit for a duration of the time parameter, the
grid is declared as unstable. All limit checks are logically connected in parallel.
Figure 3. Frequency monitoring timing diagram
Settings
Parameters:135.30 Underfrequency enable 1...135.45 Overfrequency time 2 and
135.131 Overfrequency enable 3...135.148 Underfrequency time 4
f (Hz)
t (s)
t (s)
135.41 Overfrequency limit 1
135.44 Overfrequency limit 2
135.132 Overfrequency limit 3
135.135 Overfrequency limit 4
135.144 Underfrequency limit 5
135.141 Underfrequency limit 4
135.138 Underfrequency limit 3
135.31 Underfrequency limit 1
135.34 Underfrequency limit 2
135.147 Underfrequency limit 6
135.42 Overfrequency time 1
135.45 Overfrequency time 2
135.133 Overfrequency time 3
135.136 Overfrequency time 4
135.32 Underfrequency time 1
135.35 Underfrequency time 2
135.139 Underfrequency time 3
135.142 Underfrequency time 4
135.145 Underfrequency time 5
135.148 Underfrequency time 6
Inverter trip area
Normal operation area
Inverter trip area
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