The following explanation refers to the examples in Configuration A and Configuration B of the Bus Load Configuration Examples documentation.
The example below illustrates a configuration in which a single load with different operation modes is connected to a bus with or without a circuit.
Load Power Parameters
A three-phase asynchronous motor loaded at 75% of its rated power connected to a bus by a feeder circuit. The following parameters have been used:
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Motor rated power = 10 kW
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Break power = 7.5 kW
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Coincidence factors:
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X = 1
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Y = 0.5
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Z = 0.1
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ZZ = 0.05
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Efficiency and power factor at full load = 0.82
You can connect the motor to the bus via a feeder (indirect connection) or without a feeder (direct connection).
The following two images show the connection of Motor M-30 without a feeder.
In the Electrical Engineer:
In a single line diagram:
The following two images show the connection of Motor M-2 to Bus A through a feeder.
In the Electrical Engineer:
In a single line diagram:
The calculation results remain the same in both cases, regardless of whether the
connection is direct or indirect.