Corona rings might be required only for the suspension unit or for both the suspension and post units, depending on the volt- age level. In most cases, the corona ring recommendations for a suspension unit are the same as that for the suspension used alone, e.g,. in an I-string. This is not the case, however, for post units, for which corona rings may be recommended for a stand- alone application but not when included in a braced insulator assembly. In this case, the suspension-unit corona ring may also provide adequate grading for the post member of the assembly.
Corona rings might be required only for the suspension unit or for both the suspension and post units, depending on the volt- age level. In most cases, the corona ring recommendations for a suspension unit are the same as that for the suspension used alone, e.g,. in an I-string. This is not the case, however, for post units, for which corona rings may be recommended for a stand- alone application but not when included in a braced insulator assembly. In this case, the suspension-unit corona ring may also provide adequate grading for the post member of the assembly.
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