Application And Setting Notes - Siemens Reyrolle 7SR5 Manual

Protection and Automation Functions
5.2 24 Overexcitation Protection

Application and Setting Notes

5.2.4
Parameter: 24DT Setting
•
Default setting: 1.10 p.u.
The recommended setting is below the over-fluxing withstand capacity of the protected plant.
The setting is for a multiple of per-unit flux (V/f), where:
1 p.u. (V/f) = VT rated secondary voltage (nominal) / Rated Frequency (System frequency)
Parameter: 24DT Hysteresis
•
Default setting: 0.1 %
The recommended setting is the feasible upper limit selected to avoid output chattering for marginal
measured values.
Parameter: 24DT Delay
•
Default setting: 60 s
The time delay is set below the over-fluxing withstand capability of the protected plant at the operate
setting.
152 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019