Design Selection of Transformer on Based Load Capacities for Industrial Zone

Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/ by/4.0) ABSTRACT This paper focus on one industrial zone as model of base loads consideration in where many loads power consumption are applied many kinds of transformers and specifications. That will involve the correct design selection for location of transformers and their accessories that are considered inductive loads and capacitive loads are affective active and reactive loads which are depended on their operation of each division. Load design will be important whether to reduce loss or stability of power factor while operation in running time. Load acres, load sizes and load stabilities are selected with many effectives beyond transformers are settlement in each acre. The expected operating characteristics should not be determined at the necessary protection provided.


INTRODUCTION
Design of service condition involves a study of the load, type of load to be supplied, density of consumers, points available for supply of electrical distribution lines, street and road layout, layout of distribution lines along the roads. The main load on the distribution system may be divided into various categories such as residential or domestic load, commercial load, industrial load, municipal load, traction load and etc.
The electrical design of distribution may be subdivided mainly into primary distribution system, distribution transformers, secondary distribution and consumer's service connections [1]. The transformer selection design will involve based on choosing the distribution voltage for primaries, size and location of distribution transformers, type of distribution system of primaries and secondaries, allowable voltage regulation on load, length of the line and size of conductors used for the distribution system.
In primary distribution voltage in Industries are 33kV and secondary distribution voltage are 11kV. The low voltage level for industrial zone is 230V and 400V. In this design, a 33kV line is taken to the load center 33/11kV transformers are installed in their application.

MATHEMATICAL REVIEW
For design and calculating the base load of each division of industrial compound are calculated by using following equations. Base Impedance, transformer impedance, transformer per unit impedance base current, actual fault current, short circuit current, short circuit MVA are considered in calculation on based load effects. Firstly consider, maximum possible load current are dependent on maximum power consumption which was calculated in equation (1). The relation of maximum demand or maximum load and average demand are point out calculated because of which is mainly considered the criteria of load consumption that are described from equation (2)

CHARACTRISTIC OF BASED LOAD
The maximum power consumption capability must be in accordance with system requirements. The transformer must be suitable for the environmental conditions and to constructional methods.
The maximum, minimum, average temperature can be caused to increase loss and then mainly consider maximum operating temperature and maximum ambient air temperature, solar absorption coefficient, solar radiation intensity [2].

IJTSRD23983
International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 In order to arrive at an overall evaluation of electrical power requirement, adequate consideration should be given to transient demand requirements which are of a capacity or duration to impair system voltage and/or frequency stability or to exceed short time ratings of power source. The proper selection of characteristics and capacity of power-source components and resulting assurance of satisfactory performance of equipment, under normal, abnormal, emergency operating power conditions.

RESULTS DATA OF LOAD CAPACITIES FOR TRANSFORMER SELECTION
In industries loading operation are inductive loads for what power factor assumption are considered minimum rating, 60% and 80% of rated power. Inductive affective is going to found loss of reactive power in which the losses mainly considered the load of transformer according to minimum power factor assumption. Environmental affects considered a little capacitance losses of load reduction therefore it was neglectable the load focus on this paper. The following table are shown selection of transformers nomination with calculated load capacities what of block numbers.
An overall evaluation of electrical power requirement, adequate consideration should be given to transient demand requirements which are of a capacity or duration to impair system voltage and/or frequency stability or to exceed short time ratings of power source.

Transformer Blocks
Capacity of Transformers

CONCLUSIONS
The different possible base loads are considered that can simultaneously be changed faults, weather affects, suddenly load demands and so on in time varies which all are very important facts. The others; the average load and intermittent load (rms) are rather considered on load suddenly change condition. The proper selection of characteristics and capacity of power-source components and resulting assurance of satisfactory performance of equipment, under normal, abnormal, emergency operating power conditions.

ACKNOWLEDGEMENTS
The author is deeply grateful to Dr. Yadanar Aung, Professor and Head of Electrical Power Engineering Department, Technological University (Mandalay) for her willingness to share her ideas and helpful suggestions on this paper writing.