Abstract
Metal-clad SWITCHGEAR using magnetic-type power circuit breakers has had a top limit of 500 mva (megavolt-amperes) interrupting capacity for some time. However, studies begun in the early 1950's indicated that the loads to be expected in the foreseeable future required area substations with mva ratings about 50 to 65% larger than those obtainable with the 13.8-kv 500-mva breaker equipment. A 750-mva equipment will permit an increase in substation size within this range.
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