求翻译：In the tri-phase and three-wire electric energy metering ways,we use to connect in parvafacies and incomplete stellate connections. Comparing two different ways,when we connect in the way of incomplete stellate connection, two phase impedance numbers of A and C are not equal.While if we connect in the way of parvafacies connection, two phase impedance numbers of A and C are equal,but they are all bigger than those in incomplete stellate connection.Based on the different impedance character of different connections,we may choose relative electricity meter and voltage mutal inductance to achieve the minimum comprehensive error.是什么意思？

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