Generator Actual Current Rating

[hash80]

It seems basics but its confusing me:

The nameplate current rating of a genset is the current load on each phase or each phase x 3 or its In.

 

[itsmoked]

It's the current out each of its individual cables - of which there are three.

It's what you can see with an ammeter clamped on a cable.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[hameedekhlas]

It is the amount of per phase current in three phase.

 

[IndianTechEngg1001]

If current is 3200A then it means each phase will be having 3200A.

Simply speaking keep my below description as a thumb rule.

For Power-

3000kW of three phase load means 1000kW (Phase L1)+ 1000kW (Phase L2) and 1000kW (Phase L3)

For Current

3200A Three Phase means 5094A in L1, 5094A in L2 and 5094A in L3

Please check the attached file for quick reference.




If any confusion please intimate.

 

[IndianTechEngg1001]

For line

"3200A Three Phase means 5094A in L1, 5094A in L2 and 5094A in L3"

Please read

5094A Three Phase means 5094A in L1, 5094A in L2 and 5094A in L3

Sorry I typed wrong 3200A in that in place of 5094A.

 

[hash80]

Now, is In is the total current from all three phases? Do we add 3 currents on each phases?

 

[hash80]

I mean what 'In' would be out of those explained?

 

[IndianTechEngg1001]

In 5940A (3 Phase Current) In your case this is also equal to I Ll = I L2= I L3

 

[hash80]

With different running current loads on 3 phases, do we take average of the 3 and would it be running In?

 

[IndianTechEngg1001]

No you cannot average them.

It load in one phase is 3000A and in other two 0A, then it doesn't mean that current in all phases equals to 1000A.

Never do that.

Simply get the currents based upon the loads that are connected to their phases.

 

[hash80]

My So 'In' is the total running load measured on one phase or altogether on all phases (their summation)? What actually 'In' is? Also we see on MCCBs

 

[rbulsara]

"In" usually means the rated nominal current or the sensor size.

I would recommend you read instruction and operating manuals of the breakers and their trip units in question. Especially if the breaker has an adjustable electronic trip unit. You need to differentiate between sensor rating, plug rating and Long time pick up settings and where do they apply.



Rafiq Bulsara

http://www.srengineersct.com

 

[waross]

I've never seen In on a generator nameplate, but I haven't seen everything yet. I would assume In to mean Neutral current. It may be an indication of the maximum unbalance that the generator may accept without excessive rotor heating. I would be more comfortable seeing the whole nameplate. Seeing everything in context helps to understand unexpected ratings.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[rbulsara]

My last post was in response to the post immediately preceding it, referring to MCCB.

Rafiq Bulsara

http://www.srengineersct.com

 

[waross]

You may be correct Rafiq. He may be looking at the generator breaker when he sees In.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[IndianTechEngg1001]

I also feel that In is for Current to be taken for Breaker Rating or Bus bar Sizing.

Normally Current Ratings of Generators are in "AMPS"

 

[hash80]

Infact my Energy Analyser is showing 'In' also. Actually I wanted to know what this 'In' is keeping in view IndianTechEngg1001's posts?

 

[rbulsara]

I can read a manual not mind.

Rafiq Bulsara

http://www.srengineersct.com

 

[hash80]

Manual does not tell anything about 'In'. It seems its something all together all phases current. I would like to know what this 'In' is afterall?

 

[rbulsara]

Try their tech support.

Rafiq Bulsara

http://www.srengineersct.com