Current Injector

RTFM!!!!!!!!!!!!!!!! RTFM!!!!!!!!!!!!!!!!RTFM!!!!!!!!!!!!!!!!

If you don't understand TFM, hire an engineer who can.

Call the supplier and ask for help!!!!Or, CTFS!

You, obviously, don't know anything about the equipment you are supposed to be maintaining. Your previous posts here bear that out.

The lack of knowledge you exhibit represents a threat to human safety.

I know nothing about your facility, or the equipment in it. I think you don't either!

At least I admit it.

I'll do my best to ignore you in the future.

you forced me to use such language.

No. No one forced you to do anything. You chose to respond the way you did which was far from "equal and opposite". Not cool at all, coolyaar.

I think you are angry because Lyn brought out the fact that you truly don't know what you are doing.

Ignorance + Dangerous Equipment = Someone getting killed!

Get your composure and some humility. Then we may be able to help you.

coolyaar, why would you want to test the breaking capacity of fuses and MCB's?

Like you it's pointless!

Perhaps if you approached the seniors at your facility with reasonable questions they may take time out to help.

If like here you go asking a series of inane unrelated questions it no surprise you get short shrift.

I've asked before, what is your role in this facility? To me you don't seem to have one.

You constantly lurch from one topic to another. There is no cognicant thread to your questions.

You can get 2.5kA for 1s @ 3.45V! What 'breaking' tests do you think you can do? And what is the use of breaking a current after passing it for 1 sec? Think everything out before asking.....

And you may have just burned out your bridges by that disproportionate rant.

Am i misunderstanding some of the posts or are the posters seriously addressing your point of testing MCBs and fuses with this thing? Let me repeat...you have 2.5kA at 3.45V. You can't do any breaking tests with this current injector. You need a recovery voltage of 415V. You can, at best, do some limited I_cw testing. It is meant for passing a large current at low voltage for temperature rise tests. If you want to do a short-circuit tests, you need to go take a look at the equipment at CPRI or ERDA. There is no free lunch.

how can i get this 2.5KA at 400A tap for 1 second because once tap selector is set at 400A and the potentiometer for current variation is varied ,the output current of injector will change in normal way from 0A to 400A.

Power the injector just after the tap and the potentiometer have been set for the necessary current (and the fuse or the MCB is already connected to the output).

This tester being of course used for testing of the settings of solely the thermal safety devices. With toltage dropping down to almost 0 V with the highest currents.

Coolyaar,

What the maximum currents and times mean is that the injection tester components will heat up to their maximum [from cold] at the tabulated time and current. Any more current or time and the tester may overheat. Consequently it may lose accuracy permanently, have reduced life or fail.

This is a behaviour of any equipment with a "short time rating", not just an injection tester.

For times of one minute or longer, one can just use a "cooking timer" or clock to help keep to the time limit. For 1 second, to avoid risk of tester damage, it would be best to fit an automatic disconnect timer.

Not knowing how your test source or "test rig" works, I am unable to recommend anything.

Guessing that the tester is powered from a standard mains socket and its output current causes a proportional input current ; then a mains input overload breaker or fuse with current time curve "inside" that of the estimated tester INPUT "withstand" current-time might be a simple solution. If the tester has a transformer, then its "inrush" current might trip such a sensitive breaker - it might be necessary to bypass the input breaker temporarily at switch-on by a "fool-proof" switch which isolates the test current output.

If you are as abusive to people you ask "face to face" as you have been to Lyn, I can see why you do not get good answers. The message that helping you is an unpleasant experience is likely to travel quickly around those who might help you!

I suggest you apologise to those with whom you have got angry over answers, Lyn would be a good place to begin (at least you do not have to get into his office and endure the growl and scowl on the way).

No one who has been responsible for his own safety in what he does or responsible by example or word or document for people's safety will stay tolerant when they feel their advise is being ignored where injury or death is possible.

67model

Fuses don't get tested at site. By definition, when a fuse operates at or above its rated current, it needs replacement after the test. So fuses are type-tested by a testing authority and the performance curve of the fuse gets published so that an Electrical Engineer can make an informed selection according to the duty.

The same applies to overload breakers, except these don't need replacement.

Current injection test of a fuse? How abstruse.

They could be BS3036 fuses.

I seem to recall him asking about 11KV rewireable fuses some time back. I dread to think what's in his mind!

I mostly work with Primary Current Injector. The Current Injector is one of the essential parts of the Vehicles. Almost all electricity supply equipment is fed from a current transformer on the supply cable or bus-bar. The Primary current injector testing checks all the components of the protective system. These Current injectors need signal injection for a different type of test. These are up to the standard of the device being tested. There are many features of these current injectors which supports the vehicle to run smoother.

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