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1.Development and Application of Digital Substations
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2.HGIS Will Gradually Become the Main High Voltage Equipment for the Substations in China
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3.Electronic PTs and CTs
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4.HGIS Promotes the Technologies Concerning Combined Electric Equipment
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5.Necessity of the Existence of the Internal Earthing Switch ES1 of HGIS
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6.Electronic Photo-Electric Instrument Transformers
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7.Digital Substations
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