Testing An Ac Diesel Generator. |
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Testing An Ac Diesel Generator. |
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 Jan 22 2008, 03:45 PM
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#1
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Intermediate Member  Group: Full Member Posts: 31 Joined: 6-September 06 Member No.: 1,906  |
Hi, i want to make a test bank to "test" generators. If i want to get 500kva from a 380 Volt gen, am i correct if i say:
I = 500.000/(1.73*380), then I=760Amps, each phase. So, to use a star bank, R=220/760? R=0,29 ohms? Can any one help me? Thanks. Chris. |
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 Jan 24 2008, 03:18 AM
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#2
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Intermediate Member Group: Full Member Posts: 31 Joined: 6-September 06 Member No.: 1,906 |
Guys, can any one help me? Please!
I have a lot of iron and cantal res, but i want to know if they will work for the purpose. Please, help me my friends!!!!! Chris!  |
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Jan 26 2008, 09:20 AM
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#3
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Posting Freak Group: Moderator Posts: 2,115 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello Chris
Yes, that looks pretty good to me for a star connected load. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Jan 28 2008, 01:48 PM
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#4
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Intermediate Member Group: Full Member Posts: 31 Joined: 6-September 06 Member No.: 1,906 |
Marke, can you tell me or were to look the amps per mm^2 that stainless steel can handle? The resistors that i have seems to be made of stainless steel!
Thanks in advance! Chris. |
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Feb 6 2008, 01:42 AM
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#5
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Intermediate Member Group: Full Member Posts: 31 Joined: 6-September 06 Member No.: 1,906 |
I know that Marke do his best, so, can any one else help me please?
Chris! QUOTE (chris1373 @ Jan 28 2008, 02:48 PM)  Marke, can you tell me or were to look the amps per mm^2 that stainless steel can handle? The resistors that i have seems to be made of stainless steel! Thanks in advance! Chris. |
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Feb 6 2008, 05:54 AM
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#6
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Posting Freak Group: Moderator Posts: 2,115 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello Chris
Unfortunately, it is not as just a figure of Amps per square mm. You are looking for an intermittant rating. There is power dissipated in the resistors due to the current through them and their resistance. This power will cause a temperature rise that is dependent on the power dissipated and the thermal resistance of the resistors. The thermal resistance is a function of the total surface area of the resistors and the air flow through them. For short term overloads, you really need to know the transient thermal resistance for different time periods so that you can use the appropriate thermal resistance for the duration of the overload only. You also need to know the maximum operating temperature that is acceptable in your installation. Note, different grades of stainless steel will have different resistances. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Feb 7 2008, 02:36 AM
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#7
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Intermediate Member Group: Full Member Posts: 31 Joined: 6-September 06 Member No.: 1,906 |
Marke, i only need to know the minimum amps that my resistors can handle, not anything else!
I can send you pictures of the the resistor if it helps! Please, give me a hand! Chris. PS: Is there any table you know for the current rating that stainless steel can handle, an aprox will do it? QUOTE (marke @ Feb 6 2008, 05:54 AM) Hello Chris Unfortunately, it is not as just a figure of Amps per square mm. You are looking for an intermittant rating. There is power dissipated in the resistors due to the current through them and their resistance. This power will cause a temperature rise that is dependent on the power dissipated and the thermal resistance of the resistors. The thermal resistance is a function of the total surface area of the resistors and the air flow through them. For short term overloads, you really need to know the transient thermal resistance for different time periods so that you can use the appropriate thermal resistance for the duration of the overload only. You also need to know the maximum operating temperature that is acceptable in your installation. Note, different grades of stainless steel will have different resistances. Best regards, |
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