Let bℓ;3(n) denote the number of ℓ-regular partitions of n in 3 colours. In this paper, we find some general generating functions and new infinite families of congruences modulo arbitrary powers of 3 when ℓ∈{9,27}. For instance, for positive integers n and k, we haveb9;3(3k⋅n+3k−1)≡0(mod32k),b27;3(32k+3⋅n+32k+4−134)≡0(mod32k+5).