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Size & Short Circuit Capacity of D.G Synchronous PanelJignesh.Parmar, jiguparmar@yahoo.com, www.electricalnotes.wordpress.com
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DG'sVoltage Rating (KV)D.G Capacity (KVA)Sub Transient Reactance ( Xd") in PU% Reactance (%Xd") Impedence of the DG( Zg)Short Ciruit kVA at DG terminal (Psc)Short Circuit Current( Isc ) in KAReactance (Zg) in OhmEquivalent Zg for Parallel
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(KVxKV/ KVA)x1000(KVA/%Xd")*100 (Psc/(1.732XEX1000)(% Xd"x kVX KV x 10 / kVA)
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10.41510000.14140.17227142.85719.9374734170.0241115
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20.41510000.13130.17227692.307710.701894450.022389250.01160
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30.41520000.10910.90.086118348.623925.527454650.00938626250.00660
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40.41520000.10910.90.086118348.623925.527454650.00938626250.00470
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50.41520000.10910.90.086118348.623925.527454650.00938626250.00470
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60.41510000.13130.17227692.307710.701894450.022389250.00660
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Total Capacity of Synchronous Panel9000KVA
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Total Fault level77573.34KVA
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The equivalent Z at theDG Synch panel by parallel method0.0066Ohm
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Short Circuit Current at DG sync panel is the cumulative of all individual DG short circuit current97.22KA
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OR
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Short Circuit Current at DG Synchronous Panel=(Total Fault level /1.732*E*1000)107.92KA
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