If any expert know which commercial digital relay has function dQ/dV> or dQ/dt> fro anti islanding protection for commercial synchronous or asynchronous generators in RES? When ROCOF and vector shift do not match its function to disconnect generator in time smaller then fast Automatic Reclosing (AR t
With distinct, component by taking samples at interval(dt), of voltage and current signal, with required setting, condition could be achieved....Refer my publication of ,"One cycle inrush blocking scheme....." and "One cycle micro processor based diff. relay......".
Dear Bhupendra
I have been on you profile, but could not get full paper of those your publications?
Srete
I have given the reference, of IEE and Micro Computer journals could be finded from library.......
Dear Srete,
In general, we use the function df/dt (rate of frequency deviation) for load sheding or island an electric system during a disturbance.
We have found errors in some algorithyms that measure frenquency based on voltage or currente zero cross. This can be seen in the paper " Effect of Voltage Dips on Frequency Relays: Case Study of Power Quality Improvements in a Petrochemical Plant" in my profile: https://www.researchgate.net/profile/Herivelto_Bronzeado,
Cheers,
Herivelto Bronzeado
Dear Bronzeado
Thank you
We also use it for that, but in ideal balance Pgen-Pload,=0 , it can not detect the rate of frequency df/dt> even we put it very low on 0.1 Hz/s and 100 ms time delay?
Srete
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