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Join Date: Jan 2012
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Temperature Rise At Upper Thrust Bearing Of Generator

01/09/2012 11:20 AM
Sudden Rise of Temperature at Upper Quide Bearing of Generator
As Hydro Engineer...please help me

I got a temperature rise at upper thrust guide bearing of generator (34MW,11KV & Ns=145rpm) at my working plant ..primarily i was thinking maybe my sensors was defectives but trouble shooting revealed that the sensors was okay...and cooling system (especially water flow at cooler parts is still Okay and water is clean ) but machine still trip at high Load ie 30,31,32,33MW at temp 78c.I don't know what's wrong with machine.

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Sunday Matembo

Maintenance Engineer-Hydro Plant

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#1

Re: TEMPERATURE RISE AT UPPER THRUST BEARING OF GENERATOR

01/09/2012 12:00 PM

What does the original equipment manufacturer have to say on the topic? How long ago was the telephone call made, and why is the response unacceptable?

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#2

Re: TEMPERATURE RISE AT UPPER THRUST BEARING OF GENERATOR

01/09/2012 1:12 PM

I would put a separate test sensor on the system with a graph and chart both the system sensor and my test sensor. I'd also check the water temps on the cooling system, incoming/outgoing. Your answer will be in that data.

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Anonymous Poster #1
#7
In reply to #2

Re: TEMPERATURE RISE AT UPPER THRUST BEARING OF GENERATOR

01/11/2012 2:07 PM

Fredski

The thing is, its very diffucult to remove sensors bcos its inbuilt otherwise major assembling (major overall) is reguired which is more costly as assembling new one ,secondly u know time consumed while m/cs always its in production.Water system is clear and cool and we use it in cooling system. of m/cs.

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#3

Re: Temperature Rise At Upper Thrust Bearing Of Generator

01/09/2012 2:51 PM

So you are running and tripping at close to the rated load. Do you think this might have something to do with the relatively high temperature???

What is the trip set at, it it possible that protective devices are working as intended?

Do you normally or have you always ran the equipment at this percentage of load?

Again as another poster already asked, what does the manufacturer say about your situation?

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Participant

Join Date: Jan 2012
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#4

Re: Temperature Rise At Upper Thrust Bearing Of Generator

01/09/2012 8:33 PM

dear sir , how i contact you. our compay jinan levo bearing im.& ex. co., ltd. are the professional manufacturee of the bearings. our engineer maybe help you .

best wishes,

bill li

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#5

Re: Temperature Rise At Upper Thrust Bearing Of Generator

01/10/2012 12:04 PM

Upper thrust guide bearing indicates a vertical turbine generator. You have should two separate bearings in a common oil bath. The thrust bearing is supporting the entire weight of both the generator rotor and the turbine runner, while the guide bearing centers the shaft and prevents excessive oscillation.

There are several possible causes, but more information would be helpful. Is the sensor measuring the temperature of the bearing itself or of the oil? If it's in the bearing metal, is it the thrust bearing or the guide bearing?

I would start by checking the oil system. Is the oil contaminated? Is the oil pump actually pumping oil from the bath/sump through the cooler and back? Is the oil filter clogged? Has the oil flow rate changed?

If everything on the oil system is good, check the bearing clearances. If clearance is the issue would suspect the guide bearing first. A clearance issue on a vertical thrust bearing usually sends temperature straight up off the chart.

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Anonymous Poster #1
#6
In reply to #5

Re: Temperature Rise At Upper Thrust Bearing Of Generator

01/11/2012 1:56 PM

pwr2thepeople

hi pw.....u know there separately sensors for oil and temperature ...i gatta no problems in oil sensors in same segment bcos if i could, then alarm would be indicate d in masterview computer or other indication device like sacco.Most confussion it comes when there is no bad or tripping at other sensor at the same segment .My generator have old segment(1,3,5,7....) and (2,4,8..) but this problems it come from seg7 and its upper thrust bearing. Plse u dont have to worry about oil bcos sensor is clear.

contact me:for more infro....its killing me.

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