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excossack

Member Since: 22 Feb 2012
Location: North West
Posts: 5738

1999 Defender 110 Td5 SW Caledonian Blue

3 phase mains question

We have 3 phase UPS's at work in a new server room

Each UPS splits off to DB each with 8 breakers output at 230v

Trying to work out a rough loading figure in Watts - I can see the the L1/L2/L3 loads at the UPS but not the watts

The online calc I have used offers:
AC single phase
AC 3 phase Line 2 Line
AC 3 phase Line to neutral
as options.

Doing the calc with each option gives different readings

How can you tell what you have L2L or L2N ? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock

26th May 2023 2:33pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 794

2002 Defender 110 Td5 DCPU Chawton White

I recall i learned that in Europa the single phase voltage of 230v is between line and neutral. Between lines it's 400v

How does the UPS display the load? In Amps?

26th May 2023 6:11pm

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3615

Re: 3 phase mains question

excossack wrote:
We have 3 phase UPS's at work in a new server room

Each UPS splits off to DB each with 8 breakers output at 230v

Trying to work out a rough loading figure in Watts - I can see the the L1/L2/L3 loads at the UPS but not the watts

The online calc I have used offers:
AC single phase
AC 3 phase Line 2 Line
AC 3 phase Line to neutral
as options.

Doing the calc with each option gives different readings

How can you tell what you have L2L or L2N ?

What info have you got at the UPS, Amps? You’ve got 230V per phase, so multiply that by the load in Amps of that phase and that will give you wattage per phase.

26th May 2023 6:34pm

excossack

Member Since: 22 Feb 2012
Location: North West
Posts: 5738

Yea I have info in amps on the UPS which I can work out to Watts but an on line calculator also mentioned power factors and option to choose AC single or AC 3 phase and then options for L2L or L2N

The amount of Watts consumed varies depending on single or L2L etc.

I worked through all options and took each result so I have a range of Watts to choose from

We have the sparks due in next week to clamp test each output so we can get a reading to better understand the server racks that are consuming the most so we can try to re-balance the outputs.

L1 - 75%
L2 - 62%
L3 - 3%

We know L3 is under used at the mo so we need to work out which kit to move etc 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock

26th May 2023 8:22pm

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