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Answer Posted / sethu
How vacuum is created?
Basic vacuum created in the LPT exhaust side is because of condensing process. Phase change is occurring at the exhaust side i.e. conversion of steam into water. Specific volume of water is much lower than the steam.Hence when the condensing process happens, volume of steam reduces and basic vacuum is created.
Apart from this, vacuum pumps are provided to remove non condensable gases/air ingress which reduces heat transfer effectiveness.
Why vacuum is created?
To improve LPT cylinder efficiency & thus the load/work done shall be improved.
Effect of over vacuum?
It causes sub-cooling effect where hot well temperature reduces more than design which required to be added in boiler leads to heat loss. Also flow accelerated erosion in LPT last stages.
Effect of under vacuum?
LPT efficiency reduction which causes lesser work done & leads to reduced load output.
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Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
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