Ir acceptance example
1
Steam Turbine Controls Consulting JOSEPH F. BYRD, JR., INC. PO Box 52 Dunn, NC 28335 PH: (910) 658-1291 [email protected] EXCERPT FROM PAST REPORT…. The first graph is a plot of the four %CV stem lifts and the %MW shown with respect to (wrt) the %CV position meter. The IR is the log plot on the right axis. For an IR greater than 1, the loading would be considered flat and a governor change would occur with less than expected increase in MWs. For an IR less than 1, the loading would be considered steep and more than expected MWs would result from a governor change. The OEM's acceptance is normally expressed as the ratio of the maximum IR over the minimum for three given operating ranges. Range design actual 0 to 80% 4:1 3.9/.5 = 7.8:1 80 to 97% 2:1 1.4/.5 = 2.8:1 80 to 99% 5:1 1.4/.5 = 2.8:1 □ 0 20 40 60 80 100 % 0.1 1 10 30 40 50 60 70 80 90 100 %CV Meter %MW %CV4 %CV3 %CV2 %CV1 IR
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Transcript of Ir acceptance example
Steam Turbine Controls Consulting
JOSEPH F. BYRD, JR., INC. PO Box 52 Dunn, NC 28335 PH: (910) 658-1291 [email protected]
EXCERPT FROM PAST REPORT…. The first graph is a plot of the four %CV stem lifts and the %MW shown with respect to (wrt) the %CV position meter. The IR is the log plot on the right axis. For an IR greater than 1, the loading would be considered flat and a governor change would occur with less than expected increase in MWs. For an IR less than 1, the loading would be considered steep and more than expected MWs would result from a governor change. The OEM's acceptance is normally expressed as the ratio of the maximum IR over the minimum for three given operating ranges.
Range design actual
0 to 80% 4:1 3.9/.5 = 7.8:1
80 to 97% 2:1 1.4/.5 = 2.8:1
80 to 99% 5:1 1.4/.5 = 2.8:1
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30 40 50 60 70 80 90 100 %CV Meter
%MW %CV4 %CV3 %CV2 %CV1 IR
