400 hz

[RMD1994]

I am in the process of installing a 400 Hz frequency converter on a military base. Does anybody know if there are derating factors for the conductors on the secondary side of the convertor? I understand that the wire needs to be installed in a nonferrous raceway, but i am not sure how to size the wire.

Thanks

 

[petersonra]

I am in the process of installing a 400 Hz frequency converter on a military base. Does anybody know if there are derating factors for the conductors on the secondary side of the convertor? I understand that the wire needs to be installed in a nonferrous raceway, but i am not sure how to size the wire.

Thanks

400 Hz does not require a whole lot of derating. I created a spreadsheet based on something found in an old IEEE book somewhere. Here is what it came up with for 900 Hz.

Virtually no effect until you get over #6, and this is for 900 Hz. It gets pretty ugly in larger wire sizes though, especially at 900 Hz.


For some reason the forum strips out extra white space so its hard to post a table. The three columns are:

WIRE SIZE
NEC AMPS 60 DEGC
AMPS AT 900HZ

16 10 10
14 15 15
12 20 20
10 30 30
8 40 40
6 55 54
4 70 67
3 85 79
2 95 87
1 110 95
1/0 125 102
2/0 145 109
3/0 165 115
4/0 195 120

 

[RMD1994]

Thanks Bob this helps.

Ryan

 

[weressl]

400 Hz does not require a whole lot of derating. I created a spreadsheet based on something found in an old IEEE book somewhere. Here is what it came up with for 900 Hz.

Virtually no effect until you get over #6, and this is for 900 Hz. It gets pretty ugly in larger wire sizes though, especially at 900 Hz.


For some reason the forum strips out extra white space so its hard to post a table. The three columns are:

WIRE SIZE
NEC AMPS 60 DEGC
AMPS AT 900HZ

16 10 10
14 15 15
12 20 20
10 30 30
8 40 40
6 55 54
4 70 67
3 85 79
2 95 87
1 110 95
1/0 125 102
2/0 145 109
3/0 165 115
4/0 195 120

Don't have to derate if you use tubular wire.......