generator laod test 4

[jalover]

Is anyone can tell & explain to me what is the proper of load test of the generator using water resistance bank. we have 3 gen set, are we going to test individually and take all the parameters ( voltage, current, kw, freq, pf, engine datas such as cooling water temp, exhaust etc) with 25%, 50% , 75%, 100% & 110% load. OR 3 generators to be in parallel operation and take all the parameters on each gen with above mentioned load percent. pls to hear form anyone. thanks in advance.

 

[itsmoked]

That would work. You don't say what size though.

The size is important as the time relates to the volume of the water.

Example would be a dumpster. Add water. Suspend the electrodes so they don't touch the sides even if wiggled or pushed. Then add salt until you get the current you want. Add slowly as you need to give time for dissolving. Also as the water heats the conductivity can go up. Don't move too fast.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

If you have a dumpster large enough to radiate the heat developed great. If not, you have to add a lot of water to make up for the water that will be boiled off.
But, if you have an automatic float valve to maintain the water level, the load will be fairly stable with the water boiling. If you suspend the electrodes from a fork lift you will be able to easily make adjustments. I have used old leaf springs from a small truck as electrodes with good results.

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

 

[jalover]

thank you for your valuable info. I got 3 gen set, is it a good practice to load test individually or just connected these 3 in parallel operation to make short cut dont know which one is the proper way? is there any difference if you take the parameters of each gen while running individualy and running in parallel with the same load. thanks.

 

[waross]

Better to test individually for a number of reasons.

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

 

[jalover]

thanks. my query is not about the water resistance bank. I would like to know which is the proper way of doing load test for small gen, (250kw), is it individual load test or just connect 3 gen in parallel and do the load test. is there any difference of this.

 

[rbulsara]

It depends on the objective of the test.

Individual test is just part of the overall test. If you want to know if the 'system' work properly at load and load sharing between generators, etc., you need the system test.



Rafiq Bulsara

http://www.srengineersct.com

 

[catserveng]

The normal way I would approach this type of system would be to first test each unit individually to assure proper operation and basic settings, then parallel and test the system, this way if you have problem during the system tests you're reasonably assured it is not an individual generator causing you greif, but your paralleling and load share controls.

 

[jalover]

thanks for your reply. I think also that this is the correct way. I wonder what really we are testing specifically during the load test of generator.

 

[alehman]

I agree with catserveng. I've used this procedure many times.

Alan
----
"It’s always fun to do the impossible." - Walt Disney

 

[catserveng]

When you load test a generator you are testing not only the engine and the generator but the support systems as well. Can the engine hold rated load for a given length of time without overheating? How about the installed fuel supply system? Most on site testing of installed generators isn't done to test the generator set, its tested at the factory before being shipped. It's to test the entire installed system to assure proper overall operation.

I've seen units "fail" site testing due to improperly sized mufflers, air flow blockage to radiators, insuffcient air to the engine room, and running out of fuel because the day tank supply pump was improperly sized for the engines fuel burn rate.

Hope that helps

 

[wolf39]

jalover:

Why do you want to perform an individual load test at all? Your type of gen set (250 kW) is of standard size and such tests must have been carried out lots of times on such units. Ask the OEM for test reports.

Best regards

Wolf

http://www.hydropower-consult.com

 

[nawao]

Why not load test exporting to utility?
You can save many bucks of equipment that you will use only once. Only need to ask permission to do it depending where are you.