Hola,
El software que estoy usando dice que el cálculo manual es mayormente correcto, pero debes prestar atención a lo siguiente:
1. Puede calcular correctamente el SCC monofásico utilizando solo el método de componente simétrico.
2. La temperatura de los conductores afecta directamente a los resultados del cálculo.
3. Debe incluir la impedancia de la red de media tensión para calcular el circuito
Desafortunadamente, MeteorSPEC no admite cables de un solo núcleo. Modelé una línea de alimentación para ti con cables multinúcleo 4x (3x150 + 70). Como
consecuencia, los resultados obtenidos no son ideales, pero puede evaluar los resultados de sus cálculos.______________________________________________________________MeteorSpec-NETWORK DETAILED REPORT
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Printed: 06.11.2020 - 15:17
Drawing file: MeteorSpec_2.dwg
Calculated node: Consumer A1
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CALCULATION OF MINIMUM SHORT-CIRCUIT CURRENT
Min. voltage factor for supply network: c=1.0 IEC60909-0 [T.1]
Min. voltage factor for secondary network: c=0.95 IEC60909-0 [T.1]
Nominal voltage (phase-phase) Un2 = 0.4kV
Temperature of conductors = 90.0 C
Transformer impedance correction = No
Total length from transformer = 25.0 m
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SUPPLY NETWORK
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3-Phase Supply Network, 50 Hz, Un1 = 10.0 kV
Skq min = 500.0 MVA, Rq/Xq min=0.1
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The maximum value of the network impedance corresponds to min.SCC
Min. voltage factor for supply network: c=1.0 IEC60909-0 [T1]
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Positive-sequence short-circuit impedance ( HV side ) : IEC60909-0 [4][5]
Z ( 1 ) [HV] = 19.9007 + j199.0074 = 200.0 mOhm
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Positive-sequence short-circuit impedance ( LV side ) : IEC60909-0 [6]
Z ( 1 ) [LV] = 0.0351 + j0.351 = 0.3528 mOhm
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Impedance of the network is referred to the low-voltage side of the transformer
Rated transformation ratio t = 23.81
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TRANSFORMER
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Transformer: T1
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10.0/0.42 kV 1000.0kVA D/yn uk = 6.0%, ur = 0.95%, Pk = 9.5 kW, In = 1374.6 A
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Positive-sequence short-circuit impedance: IEC60909-0 [7][8][9]
Z ( 1 ) = 1.6758 + j10.4505 = 10.584 mOhm
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Impedance correction factor: Kt = 1.0 IEC60909-0 7.1.2
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Transformer data for calculation of 1-phase SC have been set as:
R(0)/R(1) = 1.0, X(0)/X(1) = 0.95
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Zero-sequence short-circuit impedance: IEC60909-4
Z ( 0 ) = 1.6758 + j9.928 = 10.0684 mOhm
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CABLE SECTION 1
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Cable: No name
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RV 0.6/1kV 3x150+70
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Total length of cable = 25.0 m
Number of cables installed in parallel = 4
Phase Conductors = Cu 150.0 mm2
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Resistance per unit length of phase conductor = 0.124 mOhm/m [20C]
Temperature factor of phase conductor metal = 0.00393 [1/.K]
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Temperature of conductors = 90.0 C
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Resistance per unit length of phase conductor = 0.1581 mOhm/m, [90C], IEC60909-0 [32]
Positive-sequence resistance of cable R ( 1 ) = 3.9543 mOhm, [90C]
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Positive-sequence reactance per unit length = 0.074 mOhm/m, [50Hz]
Positive-sequence reactance of cable X ( 1 ) = 1.8507 mOhm, [50Hz]
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Return Conductor = Cu 70.0 mm2
Return by fourth conductor
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Zero- and positive-sequence resistance ratio R ( 0 ) /R ( 1 ) = 7.484
Zero-sequence resistance of cable R ( 0 ) = 29.594 mOhm, [90C]
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Zero- and positive-sequence reactance ratio X ( 0 ) /X ( 1 ) = 4.7
Zero-sequence reactance of cable X ( 0 ) = 8.6983 mOhm, [50Hz]
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Impedance of cables installed in parallel ( 4 )
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Z ( 1 ) = 0.9886 + j0.4627 = 1.0915 mOhm, [90C][50Hz]
Z ( 0 ) = 7.3985 + j2.1746 = 7.7115 mOhm, [90C][50Hz]
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Note The total length of the cable is calculated as the length of polyline plus the additional length, set by the user
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CALCULATIONS AND RESULTS
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Calculated node: Consumer A1
The estimated short-circuit point is located at the end terminals of the incoming cable
The conditions of short-circuit current calculation: a bolted [solid] fault without an arc
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RESULTS OF CALCULATION: 3-PHASE SHORT-CIRCUIT CURRENT ( MIN )
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Sum of positive-sequence short-circuit impedance
Zk = 2.6995 + j11.2642 = 11.5832 mOhm
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Initial three-phase short-circuit current Ik3 = 18.941 kA, IEC60909-0 7.2.1.[33]
Positive-sequence short-circuit R/X ratio = 0.2397
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RESULTS OF CALCULATION: 1-PHASE SHORT-CIRCUIT CURRENT ( MIN )
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Sum of zero-sequence short-circuit impedance
Z ( 0 ) = 9.0743 + j12.1025 = 15.1266 mOhm
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Sum of 1-phase short-circuit impedance IEC60909-0 7.5.[54]
Zk = 14.4733 + j34.631 = 37.5337 mOhm
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Initial 1-phase short-circuit current Ik1 = 17.536 kA, IEC60909-0 7.5.[54]
1-phase short-circuit R/X ratio = 0.4179
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MeteorSpec-NETWORK 2.18