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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HARMONIC DISTORTION

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 As per CEA Guidelines, those who maintaining the substaion in the voltage level of 11kV,22kV,33kV, they should maintain the total harmonic distortion as per the below allowable limit.

Individual Voltage Harmonic Distoriton

maximum acceptable limit is 3%

Total Voltage Harmonic Distoriton

maximum acceptable limit is 5%

Total Current Harmonic Distoriton

maximum acceptable limit is 8%


The limit has mentioned by institute of electrical and electronic engineer (IEEE 519 2014)

If THD is breaching the acceptable limit, then you have to install harmonic filter to maintain the level as stated by above standards, othewise government authority will impose the penalty.

The Harmonic filter may be active harmonic filter or passive harmoic filter or hybrid harmoic filter.However, the selection of filter is based on your site load requirement. 

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