Circuit Breakers Question

That one made you tear your hair out?

1) Find a vendor of 1000 HP motors.

2) Call them and ask your question

<...1) Find a vendor of 1000 HP...> wiring. <...2) Call..and ask your question...>

Yes, I suspect the wireless version of the 1000 HP electric motor has yet to be invented. I, for one, would not want to stand near the equipment, as the stray field strength might be quite high indeed.

Nothing N. Tesla couldn't deal with, according to legend.

Not saying that it could not be done even with microwave (maser). It would probably be miserably inefficient though.

IMHO it couldn't be done without considerable collateral damage.

Mostly to innocent bystanders, and other assorted not-so-innocent personnel nearby.

My crystal ball seems broken.

A quick search of 1000hp motors shows at least 10 different voltages between 230v and 6900v, I am sure there are more. How is anybody supposed to answer this question with no important information given? Voltage, amperage, etc.

It would be easier for us to tell you what next weeks lottery numbers are going to be.

https://en.wikipedia.org/wiki/Protective_relay

https://www.electrical4u.com/distance-relay-or-impedance-relay-working-principle-types/

https://cdn.selinc.com/assets/Literature/Publications/Technical%20Papers/6358_ApplicationGuidelines_SZ-DC_20090323_Web.pdf?v=20151125-092640

I hope this is a homework question and you're not actually working in the field, asking questions like this.

My girl just told me she could help you but she charges by the minute

What is the motor FLC? (Hint: it will be written on the rating plate)

ASSuming it is a medium voltage motor...

Right. According to NEMA MG-1/2009 CH. 20.5.2 Preferred Machine Power and Voltage Rating the minimum recommended voltage for 1000 HP is 2300 V.Is medium voltage it? However, IEEE 242 ch. 10.5 Medium-voltage motor protection, considers 2300 V as medium voltage.

...As does the same chart allow for 6,600V, and don't forget it varies by type of equipment and local usage. It's a generic problem when trying to help the unethical consultants ripoff their clueless clients. Caveat Emptor.

Thank you Jraef for your information.Once I had to connect a 10000 HP induction motor on 11 kV for D.O.L. start and it was a nightmare indeed.[VFD for medium voltage wasn't fashionable then] .However, at 400 V usually the maximum was 500 HP.

^{That would depend on voltage, conductor size, length, cable construction method, ambient temperature and permissible voltage drop, among other things.}

^{Try following established standards applicable to the location. In the UK, BS7671 would be used, for example.}

Yes! You now have your answer. You may resume scratching your fingernails on the chalkboard in your native language now.

Assuming the volatge 400V and the power factor is 0.8, then your full load current is 1350Amps. Hence you have to use Circuit breaker of having minimum rating of this value.( Not maximum rating). However, it does not help you to run this motor, you should have VFD or soft starter limit the starting current.

Any motor protection relay with the minimum protection functions can be useful from the manufactures like ABB, Siemens, Schnieder etc.