[dw_7SR5_function81SettingExample, 1, en_US]
•
First stage
Least important load such as domestic customers.
•
Second stage
Separate stage load such as further domestic load and infrastructure supply.
•
Third stage
Light industrial customer load.
•
Fourth stage
Higher importance light industrial load.
•
Unaffected loads
Critical load which should be maintained whenever possible.
Settings for timings should be assessed depending on network requirements and customer practices.
Frequency setting should avoid expected network variations. Timing should allow for system fault detection
and clearance. Timing between stages should allow for CB operation and system recovery following shedding
of previous stage.
Element
Setting Values
81-1 81-1 Element Enabled
81-1 81-1 Operation Under
81-1 81-1 Setting 49.5 Hz
81-1 81-1 Hysteresis 0.1 %
81-1 81-1 Delay 3 s
81-1 81-1 Input Selection VT1/2/3
81-2 81-2 Element Enabled
81-2 81-2 Operation Under
81-2 81-2 Setting 49.5 Hz
81-2 81-2 Hysteresis 0.1 %
81-2 81-2 Delay 5 s
81-2 81-2 Input Selection VT1/2/3
81-3 81-3 Element Enabled
81-3 81-3 Operation Under
81-3 81-3 Setting 49.2 Hz
Protection and Automation Functions
5.27 81 Frequency Protection – "f>" or "f<"
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 345
C53000-G7040-C014-1, Edition 11.2019
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