EEC&harmonic - Standards of Power Quality with...

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1 Standards of Power Quality with reference to the Code of Practice for Energy Efficiency of Electrical Installations Ir. Martin WU Kwok-tin , September 2003 Abstract The Code of Practice for Energy Efficiency of Electrical Installations (Electrical Energy Code) developed under a dedicated Task Force of the Energy Advisory Committee (EnAC) was completed in May 1998. The Electrical Energy Code forms part of the comprehensive building energy codes established for Hong Kong. The Code sets out the minimum requirements to achieve energy efficiency design for electrical installations on distribution losses, utilisation losses, power quality, metering facilities, etc. The main objectives of the Electrical Energy Code are as follows: to enhance energy efficiency in electrical installation design for buildings; to reduce losses, conserve energy, save money and minimise impact to local and global environment; to complement existing safety standards; and Escalator) and help to improve power quality. This paper focuses on the energy issues in relation to the power quality problems in the power distribution systems of buildings and describes the proposed standards and requirements of power quality as set out in the Electrical Energy Code. 1. Introduction The Electrical Energy Code applies to all fixed electrical installations for all types of buildings except, emergency systems, small domestic houses, buildings with total installed capacity of 100A or less, single or three phases, at nominal low voltage, and buildings used solely for public utility services. The general approaches used for the Electrical Energy Code are as follows: a) To set out the minimum requirements for achieving energy efficient design of electrical installations in buildings without sacrificing the relevant safety and health regulations. b) To minimise copper losses in the complete power distribution systems in buildings. c) To reduce equipment losses and energy wastage in the utilisation of electrical energy. d) To reduce all associate losses and inefficient use of electrical energy related to power quality problems in buildings. e) To introduce appropriate metering and monitoring facilities to carry out future energy audit and building management works. As far as energy efficiency is concerned in a building power distribution system, the two dominant factors in power quality are its harmonic distortion and unbalanced distortion. Harmonic currents will generate additional heat in conductors due to skin and proximity
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2 effects, causing accelerated cable ageing and insulation breakdown. Unbalanced distortion in three-phase supply voltages will create negative sequence component causing additional power losses in conductors and motors. Both distortions will add undesirable currents and voltage drop in neutral conductors. 2.
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This note was uploaded on 09/28/2010 for the course EPS 090229 taught by Professor Nxhviet during the Winter '10 term at Hanoi University of Technology.

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EEC&harmonic - Standards of Power Quality with...

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