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Three-phase busbar losses

three-phase busbar skin effect, busbar losses, effective resistance of busbars

Problem type:
Plane-parallel problem of AC Magnetics.

Geometry:

All dimensions are in millimeters.

Given:
Material of busbar - aluminum;
AC current I = 1000 A (R.M.S. value);
Frequency f: 50 Hz, 400 Hz, 1 kHz, 3 kHz.

Problem:
Calculate the dependence of the busbar losses to the alternating current frequency.

Results:
Current density distribution of a three-phase busbar (f = 50 Hz):

Busbar losses as a function of frequency:

	Frequency	A	B	C
P [W/m]	50 Hz	25.3	25.0	25.0
PAC/PDC		1.05	1.04	1.04
P [W/m]	400 Hz	37.6	50.7	37.3
PAC/PDC		1.55	2.10	1.55
P [W/m]	1000 Hz	56	90	56
PAC/PDC		2.3	3.7	2.3
P [W/m]	3000 Hz	98	155	98
PAC/PDC		4.1	6.4	4.1

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