Abstract— Arc flash (AF) protection is very important for all power and process industries to maintain the safety of equipment and personnel at the workplace. This describes causes and characteristics of AF faults and gives an overview of existing AF protection methods. This proposes design and development of a microcontroller based AF protection system which utilizes physical characteristics‚ viz. unique signature of the light‚ current and pressurized sound signals during AF within tap changer/switchgear
Premium Occupational safety and health Employment Safety
An Earth Leakage Circuit Breaker (ELCB) (now referred to as residual current circuit breaker) is a safety device used in electrical installations with high earth impedance to prevent shock. History ELCBs were mainly used on TT earthing systems. Nowadays‚ ELCBs have been mostly replaced by residual-current devices (RCDs). However many ELCBs are still in use. Early ELCBs responded to sine wave fault currents‚ but not to rectified fault current. Over time‚ filtering against nuisance trips has also
Premium Electricity distribution Circuit breaker Earth
SOCIAL DISCUSSION: TOPIC: ENERGY CRISES: Cause Of Energy Crisis In Pakistan: Energy is now the talk of town in Pakistan. Starting from house wives‚ traders‚ businessmen‚ students‚ ministers all the victims of the shortage of energy. Karachi the biggest city experiencing up to 12 hours load shedding in peak hot weather and during the board exams are on the way. Every body now became the expert of energy and all the figures are on finger tips. some time the shortage is 200 MW some time 2500 MW.
Premium Energy conservation Energy development Nuclear power
STEAM TURBINES A steam turbine is a prime mover which converts heat energy into mechanical energy. In a conventional steam turbines cycle‚ water is used as the working fluid. The water is heated in a boiler by burning fuel. It evaporates into steam which is expanded in a turbine where mechanical power is generated. The steam generated is of high temperature and high pressure. The temperature is often in the 450 to 540 degrees centigrade range. The pressure ranges between 60 and 120 bar. The
Premium Energy Valve
street. He disappears and will not return any of my phone calls. At this point‚ I know I will be busted so Zach and I get in my car and take off before the cops come. About an hour later‚ I get a phone call from my mom‚ asking where I am and if I am tripping on acid. I laugh at her and say no. She then tells me that Will is in the hospital because he tried to kill himself after the argument went bad. He was found lying face down in the middle of the highway and tried to fight the police that went to
Premium Serotonin Debut albums
Who achieved more for Black Americans‚ Martin Luther King or Malcom X? Explain your answer. [50marks] Introduction It is very debatable whether Malcolm X or Martin Luther King achieved more for Black Americans‚ as Malcolm X used peace to help out with the division yet Martin Luther King used violence. They both said to help end the division between African Americans and White Americans. They both succeeded in two completely different ways. Malcolm X Malcolm X was seen as a positive move towards
Premium Martin Luther King Jr. African American
Han followed shortly after her‚ tripping over the slight step at the entrance. across the large room‚ han spotted his father staring intently at the center of the room. his lengthy legs splayed out before him‚ as the char in which he sat was far too short for someone of his lanky stature
Premium Automobile English-language films Renault
A Thousand Splendid Suns: The burqa as a symbol of both the social plight of women and a hidden sense of freedom “Mariam had never before worn a burqa. Rasheed had to help her put it on. The padded headpiece felt tight and heavy on her skull‚ and it was strange seeing the world through a mesh screen. She practiced walking around her room in it and kept stepping on the hem and stumbling. The loss of peripheral vision was unnerving‚ and she did not like the suffocating way the pleated cloth kept
Premium Taliban A Thousand Splendid Suns
On December 25‚ 2003‚ 63-year-old Nancy Sue Brown was injured exiting a packed Georgia movie theater by tripping over an A-frame caution sign that an employee used after cleaning up a spill that had occurred ten-minutes earlier. The sign Brown tripped over had fallen‚ possibly by the crowd of people‚ and was lying flat on the ground. Brown states she was paying attention to the crowd to prevent running into anyone and therefore did not see the sign on the floor. An ambulance escorted Brown to the
Premium Law Tort Duty of care
Task 2 Legislation (P2) (M1) The Government produced the legislation ‘Manual Handling regulations 1992’; they produced this legislation to help protect staff and service user from harming themselves. In health and social care settings managers produce a policy to help prevent accidents and harm coming to their staff and the service users who come into the hospital. To help control the legislation certain lifting techniques of patients were banned due to future problems with back problems of staff
Premium Occupational safety and health Law Employment