Method and arrangement for sensing and digitally transmitting analog output
measurement variables of a plurality of transformers
The invention relates to a method and an arrangement for sensing and
digitally transmitting analog output measurement variables of a plurality
of transformers to a protective unit or panel unit in which digital
measurement variables corresponding to the output measurement variables
are transmitted to a data concentrator in which a telegram is formed with
the digital measurement variables and a predetermined minimum sampling
rate.
So that analog output measurement variables of transformers can be
acquired, collected and transmitted to protective units or panel units at
high speed and in synchronism with one another, the analog output
measurement variables are converted into the digital measurement variables
(Md) and transmitted with a sampling rate which is higher than the minimum
sampling rate by a factor (m). Data is transferred, with the clock of a
clock generator of the data concentrator (26), from buffers (Buf1)
assigned to each transformer (ECT1 . . EVTBB) in the data concentrator
(26) into buffers (Buf2) assigned upstream of the FIR filters (FIR). The
telegram is composed, by means of a multiplexer (27), from output buffers
(Buf3) assigned downstream of the FIR filters (FIR).
