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IS230TDBTH6A module

The computation requirement of the RE. 216 protection functions can be seen from Table 3.3. The values given are typical percentages in relation to the computing capacity of a fictitious main processing unit. According to Table 3.1, the computation requirement of some of the functions increases for low settings of the time delay t and therefore a factor of 2 or 4 has to be used in some instances. When entering the settings for a function with several stages, the one with the shortest time delay is assumed to be the first stage. The computation requirement for the second and further stages is only reduced, providing all the stages are processed by the same processor. The computing capacity required can be viewed by selecting 'Diagnosis' from the 'List programs' menu. It is displayed for each processor and for the four sets of settings in per thousand. Relevant for the computing capacity is the highest value in the four sets of settings.

Computation requirement of protection functions

 The amount of computation a protection function entails is determined by the following factors:
complexity of the algorithms used, which is characteristic for each protection function.
Repetition rate: The faster the operating time of a protection function, the higher its repetition rate according to Table 3.1. The computation requirement increases approximately in proportion to the repetition rate.
Already active protection functions: The protection system is able to use certain intermediate results (measured values) determined by a protection function several times. In consequence, additional stages of the same protection function with the same inputs generally only involve a little more computation for the comparison with the pick-up setting, but not for conditioning the input signal.