International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Energy Conservation Using Automatic Star-Delta-Star Starter D.M. Bokde1, S.S. Jalkote2, M.V. Birajdar3, Asst. Prof. R.S.Biradar4 1(Electrical
Engineering, JSPM’s BSIOTR, Wagholi, Pune Engineering, JSPM’s BSIOTR, Wagholi, Pune 3(Electrical Engineering, JSPM’s BSIOTR, Wagholi, Pune 4(Asst. Prof. of Electrical Engineering, JSPM’s BSIOTR, Wagholi, Pune ---------------------------------------------------------------------***--------------------------------------------------------------------2(Electrical
Abstract - India is a developing country. Power is the basic
necessity for the economic development of country. So the power should be handled efficiently to meet the requirement. The proposed paper present the efficient use of the star-delta starter in since of power saving. The delta star convertor is interfaced with the conventional star delta starter. When the load on motor is less than 30% of the full load, it switches the motor connection to operate in star mode to save electrical energy. When load on motor exceeds 30% of the full load, it change over the motor connection automatically in delta mode without any disturbing working of the motor. By implementing this module saving of electrical energy is possible. So that contribution to reduce maximum demand, reduction in KVA, increase in power factor to the power system. Key Words: - delta-Star starter, Energy Saving, Timer.
1. INTRODUCTION India has 16% of world’s population, but less than 1% of the world’s energy resources. Deficiency in the demand and availability of energy the total installed capacity is 207006MW and the present peak demand s 2170000MW. The real challenges for the power sector is to narrow this gap. This can be done by increasing the installed capacity; which has it’s own limitation. Hence going by the dictum energy saved is energy generated. It is big challenges for the power sector save the energy to narrow the gap between demand and supply. In industries, more than 80% of the motors are the induction motor. Since industries are consuming major part of the power, we have to concentrate on energy saving from this area. There is huge potential to save energy in this sector up to 25%. Now a day’s usage of electrical energy gradually increasing, to meet that requirement, either to increase generation or to focus on electricity conservation. But the expansion of power generation, power grid and transmission has been restricted due to limited resources and environmental, economical constraints. Here in this project proposal for energy saving in induction motor is introducing apart from reducing fossil fuel consumption. Proposed system saves energy by changing the stator windings connections either in star or delta mode according to load variations. When load on the motor reduces below 30% of © 2017, IRJET
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full load, it switches the motor to operate in star connection from delta to save the energy. When the load increases beyond 30% of the full load, it switches the motor connection to operate in delta mode. Since the power consumption in star is rd of delta, this will lead to power saving.
2. WORKING 2.1 Conventional star delta starter This method is used in case of motors which are built to run normally with a delta-connected stator winding. the six terminals from the three phases of the stator must be available on motor terminal box. The starting of induction motor with the help of conventional automatic star delta starter is done. The time delay in this starter, before changing over from the star to delta connection should be sufficient to allow the motor peak up to its normal running speed. This period may be taken as 10 second, but could be less for a lightly loaded motor and greater for a slow starting heavily loaded motor In an automatic star-delta starter, this delay is obtained by using a timer. During starting period motor should start in star mode, applied voltage is reduced by rd operated voltage. Since the starting current of motor will reduced 1/3rd of the current with compared to the delta connection. Since the torque developed by induction motor is proportional to the square of applied voltage. Therefore star delta starting reduce the starting torque by 1/3rd that of the direct online starting.
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