Protection Scheme of a 3-Phase Induction Motor

Filtering circuitry is initiated by spurious signals causing logic errors in electronic devices. This is due to noise. IS equipment is designed to withstand brownouts that lasts slightly more than 20% i.e. a few milliseconds. Under voltage does not cause damage but services are terminated. Silicon based equipment such as memories and processor are damaged by prolonged overvoltage due to power surge. This is after the surge protector equipment has be held conduit power intensity and prolonged exposure.

The smart distribution transformer and its controllers were evaluated through simulations using PLECS simulation platform. The system specifications used to design the simulation model are given in Table 3.

A power system is always in a state of disturbance that may lead to instability in the system. The consequences of a major power supply interruption can prove to be so disastrous, that every effort must be made to reduce the impact of such a disturbance. The process of determining the steadiness of the power system following any upset is known as security assessment. In particular, MW security assessment is a process to evaluate the security of the power system following a disturbance. It is done considering the loading conditions in respect of MW power flow on the lines. Each line has a capacity to carry MW power up to transmission line design limits beyond which the lines may trip due to overloading. In this paper MW security assessment has

Abstract— Over-current in a power system is a situation when a larger than rated electric current exists through a conductor, leading to excessive generation of heat, and the risk of fire or damage to equipment Possible causes for over-current include short circuits, excessive load, incorrect design, or a ground fault. This paper presents the design and implementation of a microcontroller-based overcurrent relay for safe, reliable and efficient operation of power systems. Automated overcurrent protection is done by programming a Arduino (microcontroller) with standard ABB moderately inverse relay characteristics where the relay operates automatically in a permissible time whenever there is an over-current (abnormal or fault condition) in a power system [2].

Continued presence of high-resistance grounding equipment prevents any excessive transient overvoltage excursions during the fault clearing period. The bus is low resistance grounded and the current here, during the fault, is limited to a value (400A) that will minimize burning damage at the point of fault, yet allowing sufficient current to flow for operation of the ground fault relays.

One of the primary concerns of an older home's electrical system is safety. In the absence of a recent electrical upgrade,

If the America’s power grid were to suffer a major attack, it could have cascading effects that would impact other primary areas of the infrastructure, including telecommunications, water, oil and gas systems. The purpose of this paper is to elaborate on the issues surrounding SCADA systems and its vulnerabilities. Within this will be previous SCADA attacks against critical infrastructures, recommended solutions for prevention and risk assessment regarding power grids.

2003 Conference for Protective Relay Engineers - Texas A&M University April 8-10, 2003, College Station (TX)

Yan et al (2008) & Ebeling (1997), pointed out the purpose of maintenance is to extend equipment life and minimise the frequency of service interruption. Ebeling (1997) concluded that availability is the important index of the all indices for power availability. Several maintenance types or tactics have been suggested by many authors for example (Mowbray, 1991 and Kelly, 1997). There are mainly two types of maintenance practices and these are breakdown and preventive maintenance. Breakdown maintenance requires replacement of damaged part of the equipment during unscheduled maintenance while preventive maintenance requires replacement of the components at pre-determined intervals. Condition based maintenance is used to monitor the condition of the equipment using condition monitoring technique.

Introduction: If the system can return to its initial state shortly after it is influenced by temporary disturbances, and it will skip to new state after permanent disturbances, it is called stable system. The security of a power system is the ability to withstand disturbances and maintain stability. Generally, all changes to any one of the parameters can be disturbances. There are a great variety of disturbances as well as the ways to maintain security, but due to limited space this essay will outline some disturbances and focus on a few ways to maintain security. It will discuss how the ways is efficient to withstand disturbances and maintain security.

For reliability we have to optimize both power consumption and power supply. Smart grid works on the mechanism of data communication infrastructure. Smart grids has one of the most important feature meter data management system which is designed to collect exchange and process the meter data for optimization of power consumption and supply.

Induction motor is widely used in many different industries, it is a kind of machine use AC electric power to generate magnetic force and field from the stator winding. The different of induction motor from other kinds of motors is that induction motor need no automatic commutation, separate-excitation or self-excitation from stator to rotor to changing the power. Rotor voltage is induced in the rotor rather than being

This career episode is the creation of my thesis during my final year in engineering. The project is called “Microcontroller Based Three Phase Induction Motor Controls”. This is a partial fulfillment for my bachelor’s degree in Electrical Engineering at Mindanao University of Science and Technology. This project commenced on June 2011 and ended on March 2012. I was under the supervision of Engr. Reuel C. Pallugna, one of the instructors in the Electrical Engineering department.

Abstract: This paper investigates the dynamic performance of three phase induction motor by vector control method. The vector control algorithm is calculated on Motorola DSP56F80X. The block diagram is shown in figure which describes the structure of implement vector control algorithm. The result obtained is verified using matlab simulation. Initially speed reference is set at120 radian/s and torque taken as 0 nm. Then motor is run, speed, torque and current wave form is taken. Now speed reference changes to 160 radian/s and torque changes to 200nm and correspondence wave form is shown. I observed that it run smoothly over the full speed range, generate full torque at zero speed, and have high dynamic performance including fast acceleration and deceleration. It was originally developed for high-performance motor application for industrial drives. However, it is becoming increasingly attractive for lower performance applications as well due to FOC 's motor size, cost and power consumption reduction superiority. .. In vector control method machine is control in a synchronously rotating frame where as in sinusoidal machine variables appears as D.C. quantities. In steady state current resolved in to two control inputs I. e. direct axis and quadrature axis component

The aim of this project is to construct a single phasing monitor and prevention system using 8bit microcontroller. Anti-single phasing relays or single phasing preventer are required for critical