Electric Boiler

If by "electrode" you mean the ignition device (actually a pair of electrodes), then they connect to the secondary of the ignition transformer. Changing the boiler pressure should make no difference; keep the electrode pair as is.

Thanks for your answer, is that anyway that we connect those pairs of electrodes directly to the government power which is 11 kV 3 wire systems. my previous engineer has approved proposal like that without any transformer in between?. this is my confusion. best regaards

Perhaps one of these standards documents would help?

IHS Standards Store: "electric boiler"

Thanks

Seriously!!! You're going to connect 11kV without really understanding what you're doing and why. Find someone who is qualified and pay them to sort this before you come to serious harm.

No!! Let him go, someone has to make those you tube videos of what not to do!!

" and that little johnny, is why you dont lick power points"

You're right!!!!! How silly of me to try to deprive the Darwin Awards of another entry

SUlzer electric Boiler:

Do you meam that it is an Electrode Boiler? (a boiler which is heated by using electricity via 3 electrodes (if 3 phase) or 2 electrodes (if 2 phase only ??) ).

This also means that you are not using any king of FUEL for heating the boiler.

Please clarify.

Also, 32 bar at 40 mW means nothing. You have misread or ???

I assume he meant MW

Yes, boiler using the electrode to get the steam, and it is 40 mega watt

Well, then it is an electrode Boiler.

The Electrode will be connected directly to the 3 phase supply, usually through a contactor. The pressure inside the boiler will depend on how long the power is connected ON and the consumption.

The pressure is regulated with a pressure-Stat setting. Also, the level of the water inside the boiler (how much of the electrodes is submerged), will dictate the amount of current flowing (== the amount of power being absorbed ).

Waouou, quite a big unit for an electrode boiler to be sized at 40 Mega Watt.

Now, whether you need a step-down transformer or not depends on the manufacturer's design.

You can guess if you have to connect 11kV directly to the electrodes or not by looking at the control panel to see what type of contactors are used to connect/disconnect the electrodes. For 11kV supply, the contactors will have to be bulky and well protected /isolated for that voltage.

Since you seem to have a transformer, is it a step-down from 11kV to 400V?

And what is the transformer's power rating: 40 MW ??

The electrodes will have to be well spaced for 11 kV.

.....

Thanks for your info Lucke, seem our electrode boiler connected directly to 11 kV, and we only get 3 phase, 3 cable system from the government power, How is the grounding system for this boiler, if we make separate grounding system for that electrode boiler but at the end the grounding will connected to mill ground by steam pipe, is that harm if I doing like that. Thanks

I cannot advise you 100% on the grounding system that will be most suitable for your installation. You better check with a local engineer or Pro.

What I can advise on is that the body of the boiler should be earthed with a separate and dedicated earth pit (or equivalent) but you must also make sure that the 11kV supply has a grounding at the 'government' side, (which is supposed to be ), and that there is an adequate tripping device to disconnect the supply in case of a fault.

This is very important. 11 kV supply is not trivial!

The steam pipes, connected to the boiler will be at earth potential, like the boiler, and you should have some other earthing done in the factory, on the steam pipe supply.

You need a good electrical engineer, expert in that field, to have a look and advice on this issue. What I gave you is a minimum to make sure you understand and protect the people working there, only until you get a better advice, locally.

Wow! 40 mW of power is a very very very tiny boiler.

Yes, it is only for small paper machine

An electric heating element is not the same thing as an electrode. I'm not sure a 40 MW electric boiler is any more credible than 40 mW.