STP & ETP

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  STP     Sewage treatment platn (residential & commercial) ETP     Effluent treatment plant (industry) COD     Chemical oxygen demand (soluble & insoluble organic compound) (2hr to 3hr) (mg/l) BOD     Biochemical oxygen demand (organic compound) (3days to 5days) (mg/l) KEY POINTS: Outlet of STP 50mg/l Biproduct of anaerobic digestion is H2S & NH3 To reduce stink smell use ozone 
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SWITCHGEARS

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SWITCHGEARS

                                        

SOME IMPORTANT ABBREVIATIONS USED IN SWITCHGEARS

MCB                Miniature Circuit Breaker
ELCB               Earth Leakage Circuit Breaker     
RCCB              Residual Current Circuit Breaker     
RCBO              Residual Current Breaker With Overcurrent 
MCCB             Molded Case Circuit Breaker
VCB                 Vacuum Circuit Breaker
ACB                 Air Circuit Breaker
SF6                   Sulphur Hexafluoride
SFU                  Switch Fuse Unit
OLR                 Over Load Relay

STANDARD RATINGS AVAILABLE IN MARKETS ARE

MCB < 100 A    No of poles 1,2,3,4 
ie., 6,10,16,20,25,32,40,50,63  

RCCB < 100 A    No of poles 2,4
ie., 25,40,63 with sensitivity 300 mA & 100 mA

ISOLATOR < 100 A    No of poles 2,3,4
ie., 40,63,80

VCB < 3000 A with 35 kV    No of poles 3
ie., 800,1250

ACB > 1000 A & < 10000 A    No of poles 3
ie., 1000,1250,3200




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