Browsing by Author "Sreedhar, P.N."

Now showing 1 - 6 of 6

Efficient utilization of electrical energy in pumping operations based on existing conditions - A case study
(2007) Giridhar, Kini, P.; Sreedhar, P.N.
The intersection of the pump characteristics with the system characteristics gives the design operating point for a given pumping system. Changes in conditions of fluid viscosity, total head, throttle positions, supply system parameters etc causes the operating point to shift on either side of the pump head-discharge curve, which affects not only the hydraulic output of the pump, but also results in the inefficient utilization of available electrical power. Use of variable speed drives involves additional investment, which if the pump is in operation for long hours every day throughout the year with the number of such units in operation being small in number, but is the best possible option to achieve energy efficiency. But if the industrial utility has large number of pump units for various processes, with individual operating times being quite insignificant, yet important in the process involved, variable speed drives may not be the best possible solution. This paper makes an attempt in presenting a simple method for making the pump to work at / or near its operating point based on the exiting system conditions, with the least possible changes to the working setup in addition to achieving the desired objective of efficient utilization of the available electrical power. The analysis is supported by a case study.
Efficient utilization of electrical energy in pumping operations based on existing conditions - A case study
(2007) Giridhar Kini, P.; Sreedhar, P.N.
The intersection of the pump characteristics with the system characteristics gives the design operating point for a given pumping system. Changes in conditions of fluid viscosity, total head, throttle positions, supply system parameters etc causes the operating point to shift on either side of the pump head-discharge curve, which affects not only the hydraulic output of the pump, but also results in the inefficient utilization of available electrical power. Use of variable speed drives involves additional investment, which if the pump is in operation for long hours every day throughout the year with the number of such units in operation being small in number, but is the best possible option to achieve energy efficiency. But if the industrial utility has large number of pump units for various processes, with individual operating times being quite insignificant, yet important in the process involved, variable speed drives may not be the best possible solution. This paper makes an attempt in presenting a simple method for making the pump to work at / or near its operating point based on the exiting system conditions, with the least possible changes to the working setup in addition to achieving the desired objective of efficient utilization of the available electrical power. The analysis is supported by a case study.
Importance of accuracy for steady state performance analysis of 3? induction motor
(2005) GiridharKini, P.; Sreedhar, P.N.; Varmah, K.R.
This paper brings out the need for achieving accuracy in estimating the various operating parameters like motor efficiency, losses, operating power factor etc in order to analyze the steady state conditions in non-ideal situations, with an analytical study. Core losses have been usually neglected in the analysis with the assumption that they are quite negligible in nature. Voltage variations have become a common phenomenon as of late. As core losses are dependent upon the supply voltage, it is therefore necessary to include the core loss in the analysis, however small they may be. This example takes into account both overvoltage and undervoltage conditions, with upto 5 % unbalance variations.
Importance of accuracy for steady state performance analysis of 3Ï† induction motor
(Institute of Electrical and Electronics Engineers Inc., 2005) GiridharKini, P.; Sreedhar, P.N.; Varmah, K.R.
This paper brings out the need for achieving accuracy in estimating the various operating parameters like motor efficiency, losses, operating power factor etc in order to analyze the steady state conditions in non-ideal situations, with an analytical study. Core losses have been usually neglected in the analysis with the assumption that they are quite negligible in nature. Voltage variations have become a common phenomenon as of late. As core losses are dependent upon the supply voltage, it is therefore necessary to include the core loss in the analysis, however small they may be. This example takes into account both overvoltage and undervoltage conditions, with upto 5 % unbalance variations.
Intelligent approach for efficient operation of electrical distribution automation systems
(2003) Manjunatha, Sharma, K.; Sreedhar, P.N.
The distribution systems play a vital role in making efficient service in terms of power quality, reliability, and economy. The distribution network reconfiguration can be used for planning as well as real time control. This paper presents an efficient approach for network reconfiguration approach based on artificial neural networks. A package "DISTFLOW" is developed adopting the proposed technique. The off-line simulation results and daily load curve data are used for training of the neural network. Further the distribution system operation is optimized by selecting optimum compensation level computed by Genetic Algorithms (G.A). The proposed integrated approach is applied to 140 bus practical system of Surathkal city subdivision, of the power utility Mangalore electricity supply company (MESCOM).
Intelligent approach for efficient operation of electrical distribution automation systems
(2003) Manjunatha Sharma, K.; Sreedhar, P.N.
The distribution systems play a vital role in making efficient service in terms of power quality, reliability, and economy. The distribution network reconfiguration can be used for planning as well as real time control. This paper presents an efficient approach for network reconfiguration approach based on artificial neural networks. A package "DISTFLOW" is developed adopting the proposed technique. The off-line simulation results and daily load curve data are used for training of the neural network. Further the distribution system operation is optimized by selecting optimum compensation level computed by Genetic Algorithms (G.A). The proposed integrated approach is applied to 140 bus practical system of Surathkal city subdivision, of the power utility Mangalore electricity supply company (MESCOM).