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Anonymous Poster #1

Transformers for illumination

01/22/2022 8:54 AM

Dear Sirs,

Do we need transformers for illumination, as for valve house and surgetank site of hyropowerplant in around 63kVA transformer?

We also had around 1000 kVA of isolation transformer intended for headworks.

Regards,

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#1

Re: transformers for illumination.

01/22/2022 10:06 AM

If you can find an 11kV light bulb, then no, you don't need a transformer.

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#2

Re: transformers for illumination.

01/22/2022 11:09 PM

"Do we need transformers for illumination"

Tornado's answer is correct.

"transformers" is plural. You may be able to make it work with just one, but you MUST have an appropriate voltage for the lighting devices selected.

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#3

Re: transformers for illumination.

01/23/2022 1:14 AM

If your LV switchgear is 3-pole design without neutral busbar, then you need an isolation transformer to obtain a neutral for single phase distribution to lights and socket outlets.

The isolation transformer has another benefit as well that it reduces the fault rating in the lighting / small power circuits, thus allowing one to employ MCBs (without need for HRC fuses) in the DBs.

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#4

Re: transformers for illumination.

01/23/2022 6:35 AM

https://www.electrical4u.net/electrical/purpose-of-unit-auxiliary-transformer-uat/

If you have an auxiliary Tfx, use that for small power and lighting.

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#5

Re: Transformers for illumination

01/24/2022 7:16 AM

If the site is never to be accessed during periods of low ambient light, then no, and the <...we...> doesn't need lighting installations either.

Local Health & Safety regulation determines this more than anything else.

The end Client may well have a requirement.

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#6

Re: Transformers for illumination

01/24/2022 7:47 AM

It is getting difficult to sort out which <...Anonymous Poster #1...> is which these days...

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#7
In reply to #6

Re: Transformers for illumination

01/24/2022 8:12 AM

Retsop Suosmynona

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#8
In reply to #7

Re: Transformers for illumination

01/24/2022 10:29 AM

Gesundheit.

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#9

Re: Transformers for illumination

02/01/2022 5:02 PM

You generally don't need an additional separate transformer just to power the lights (which I am assuming is what you are asking about), you should have spare capacity in your supply or auxiliary transformer for lighting.

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#10
In reply to #1

Re: transformers for illumination.

02/08/2022 4:47 AM

Arc lighting perhaps?

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