T h i s paper presents an e f f e c t i v e method t o e v a lu a t e the e l e c t r i c a l v o l t a g e and the c u r r e n t d e n s i t y i n the immediate v i c i n i t y o f rt t o r o i d a l grounding i n s t a ll a t i o n o f DC s u b s t a t i o n s . I n order t o guarantee t h a t voltage r i s e s generated d u r i n g o p e r a t i o n a r e w i t h i n s a f e l i m i t s and c o n s i d e r i n g the need t o reduce the dimensions and c o s t s of groundi n g i n s t a l l a t i o n s , i t becomes necessary i n c e r t a i n cases t o improve he s o i l model i n the area of i n f l uence o f the e l e c t r o d e . E l e c t r o s t a t i c theory i s used t o generate a v o l t a g e s o l u t i o n f o r the Laplacian equation f o r n -l a y e r s o i l s . A d e t a i l e d a n a l y s i s i s presented f o r 4 -l a y e r s o i l mode l s and computed v o l t a g e p r o f i l e s a r e shown i n the v ic i n i t y o f an a c t u a l e l e c t r o d e . T h e o r i t i c a l r e s u l t s obt a i n e d f o r a 2 -l a y e r s o i l model a r e a l s o presented along w i t h measurements c a r r i e d out a t Ecole Polytechnique de Montreal on a reduced s c a l e e l e c t r o d e . L i s t o f Svmbols A a B b: I b .
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