Different operating conditions of steam turbine

[baasi]

What is meant by maximum continuous rating of steam turbine and what is the difference between maximum continuous ratings and rated output of steam turbine?
Can someone explain me following conditions of steam turbine operation that what exactly these are??
1. THA (Heat rate acceptance condition)
2. TRL (Rated load condition)
3. TMCR (Maximum continuous rating condition)
4. VWO (Valve wide open condition)
5. 75% THA condition
6. All high pressure heater stop condition
Keep in mind that these are conditions for our supercritical steam turbine in coal fired power project. I do not know that these conditions remain same for all projects or not.
If someone have knowledge about it kindly explain me.
Thanks in advance.

 

[racookpe1978]

Did you read your turbine training manual? You are asking very basic questions.

 

[byrdj]

Interesting question again...
I suggest that the actual document that the referances are made must provide the definntion of each phrase. Over the years I have seen the same OEM use the same phrase for completely different conditions based upon the engineering group that wrote the document. It really creates chaos if the phrase is used in a legally binding contract without providing the exact meaning nor comment to implied document.

 

[byrdj]

this could be a Standard but I have never seen contents
iec45-1-1991

 

[racookpe1978]

That's why I'd rather not guess what another plant's (another builder!) definitions are.