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Voltage Drop in Moving Cable Systems - 无图版
sdh --- 2007-06-01 23:33:28
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Voltage Drop in Moving Cable Systems
The choice of conductor size is frequently influenced by consideration of the voltage drop in the circuit.Economic factors dictate that a cable having the smallest conductor
size be chosen for any installation.However,care must betaken to ensure that the use of a cable having small conductors not result in such a large voltage drop from the power supply to the utilization equipment that the equipment not function properly.
It is common in moving cable systems for the cable to join a power supply to a motor.Assuming that the motor is designed to operate at the nominal supply voltage,voltage drops larger than 5% can result in decreased motor life.
Voltage drop can be calculated using the following equations.
For single-phase circuits,
Voltage drop,
Vd = Vs - Vr = (2×L×I×R)/1000
For three-phase circuits,
Voltage drop between conductors,
Vd = Vs - Vr = (√3×L×I×R)/1000
where Vs = voltage at the supply end
Vr = voltage at the receiving end
L = cable length (feet)
I = current (amps)
R = conductor resistance (ohms/
The conductor resistance used in these equations should be the resistance at the cable’s operating temperature.Industry standards normally provide resistance values at some reference temperature such as
Resistance at operating temperature,
Ro = Rr [1+0.00393(To -Tr )]
Where Rr = resistance at reference temperature
To = operating temperature (°C)
Tr = reference temperature (°C)
任我行 --- 2007-06-02 08:35:48
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江南狼 --- 2007-06-02 08:41:24
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zero61603 --- 2011-11-10 12:56:38
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jack2204 --- 2011-11-13 16:56:38
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vcable --- 2018-04-27 11:53:46
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