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This paper reports on the development of a multiple-break porcelainclad 3-cycle air-blast circuit breaker type DHF with 2,000-ampere continuous current capacity and with interrupting ratings up to 25,000 mva (megavolt-amperes), depending on voltage. The new design is based on long service experience and system tests carried out over the years with the smaller type DCF. Because of the exceedingly good...
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