Problem in Ranking Function in Genetic Algorithm

Hi, I'm working with genetic algorithm to calculate a problem with
many restrictions. So my problem is a minimization and the cost of the
best result is near of zero. When I put restrictions I add cost to
objective function. Each violation of the restriction I add 100 to
cost function. I using some ranking techniques like linear ordering,
exponential ordering and mutation/crossover tax adaptively. The
problem is the difference between maximum e minimum of cost function
is very large (minimum near of zero e maximum near of 1000). How to
ranking this function to selection operator works?

Thanks

.

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