The current interruption devices are called circuit breaker. A type of switch use to open or close a circuit to route power through a switchyard, or to protect substations or switchyard equipment. Contents abstract switchyard definition switchyard equipment relays protection schemes of relays switchyard emergencies plan of actions of switchyard. Civil, electrical and protection and control engineering control building and panel assembly. To accomplish the design objectives, four criteria for protection should be considered. Electrical substation equipment for transferring of electrical power from generating unit to distributing units various types of electrical equipment are required. Through the faulttree analysis, one may understand the reliability of the. Our substation, project management and engineering teams complete custom designed projects within budget and on schedule for various clients. Protection of substation electrical substation fuse. Click on the link below to request a free quotation.
Switchgear protection plays a vital role in modern power system network, right from generation through transmission to distribution end. Introduction substation protection system power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults through the isolation of faulty parts. This collection includes items used in the operation of relays and relaying systems in the transmission, generation, distribution and utilization of electrical energy and their effect on system operation and focus the application, design, construction and operation of protective, regulating, monitoring, reclosing, synchcheck, synchronizing and. Distribution substations michigan technological university. The two types of equipment are interconnected in one physical locationthe primary equipment located in the substation switchyard, and the secondary equipment located in a control house. For safety of personnel and for enabling earth fault protection. This substation scada monitoring course will deal with all of these important issues. Pgcil, bhatapara, chhattisgarh 400220kv substation with automation substation for power evacuation up to 500 mw customer benefits. The fill for embankment ranges up to 27 feet in depth and the cut for excavation ranges up to 24 feet in depth. Switchyard means collection of equipment where high voltage electricity is switched using of various components. Our goal is to convey practical job skills and career development for our clients and students by saving lives through a worldclass learning experience. Often the most desirable arrangement has the main buses at higher elevations than the buses and equipment in the substation bays.
Substations are congregation of electrical equipment through which consumers get supply of electrical power from generating stations. Switchyard overview equipment earthing and system earthing equipment earthing purely for the protection of the user in this case the exposed, noncurrent carrying metal parts of a piece of electrical equipment, say a tablelamp, is connected electrically to earth or ground if. When a large fault current flows through the circuit breaker, this is detected through the use of current transformers. In the context of this document, a transmission bus is any bus, 60kv and above, with three. The differential relay is used to provide internal fault protection to equipment such as transformers, generators, and buses. Current to be measured is passes through primary winding. Distribution substations may also be the points of voltage regulation, although on long distribution circuits several kmmiles, voltage regulation equipment may also be installed along the line. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. Before using or assigning ppe, steps should always be taken to eliminate or control hazards and work procedures should be in place to limit exposure to these hazards. Evaluation of rolling sphere method using leader potential concept. Chapter8 switchyard equipment hv bus bars, switchyard.
An electrical substation is a subsidiary station of electricity generation, transmission and distribution system where voltage is transformed from high to low or low to high using transformers. However, the pro tection provided depends crucially on the quality of the installation. Through the period, cost cutting efforts resulted in numerous layoffs, reduced hiring. This electrical substation and switchyard design course focus on elementary safety standards and practices in substations and switchyard design. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. For the protection of substation and its components from the over currents or over load due to short circuit or any. Home technical articles 7 design diagrams that hv substation engineer. Switching equipment for any reason became very time consuming and required reconfiguration of the circuits leaving the substation. Different equipments in a switchyard bus bars, insulators, circuit breaker. Both automatic and manual control can be performed locally at the equipment. Arguably, one of the most important piece of equipment in any substation is a power transformer.
The switchyard auxiliary power system is designed with adequate equipment, standby power, and protection to provide maximum continuity of service for operation of the essential switchyard equipment during both normal and. Pge is a proven leader of fullservice substation construction and engineering concept design, economic. Different switching schemes can be selected as emphasis is shifted between the factors of security, economy, extendibility, maintainability, operational flexibility, protection arrangement, short circuit limitations, land area, safety and simplicity dictated by function and importance of the substation. Pgcil, bhatapara, chhattisgarh 400220kv substation with. To provide the path for discharging the earth currents from neutrals, faults, surge arresters, overheads shielding wires etc. A substation is a part of an electrical generation, transmission, and distribution system.
The substation design manual is not intended to replace asset management standards, but rather to act as a reference document that crossreferences existing standards and process documentation and plugs any gaps where asset management documentation does not exist. If the reprint or republication includes ed material, the credit should also state. Sample smart ground report lightning protection by. Centralized substation protection and control ieee psrc. Switchyards generally have breakers, isolators, cts,pts, bus bars, protection and control equipments, transformers,grounding wires and switches. Most utility companies are currently larger and more dynamic but employee far less people. Types of switchyard there are two types of switchyards from insulation. Technical specification for design, supply, installation. Provides equipment protection for transformers, lines, cables, and capacitor banks used to energize and deenergize capacitor banks and other circuits. L minimizes the amount of equipment removed from service in event of a failure l failure determination.
Ltd defination a switchyard is a part of an electrical generation, transmission, and distribution system. Switchgear equipment disconnects and isolates a piece of equipment so maintenance work can be performed. The economics of generation of electrical energy and the huge demands of power in the modern times require creation bigger power plant. Purpose of protection system l minimize damage l leave unaffected equipment inservice l maintain equipment operating limits l maintain electrical system stability. Reliability of substation configurations daniel nack, iowa state university, 2005 introduction while one of the strongest points in a power system is the electric substation, it still contains what could be described as weak points or points of failure that would lead to loss of load. Fire protection systems designed specifically to address the unique hazards posed by power transformers are a design consideration that must be recognized and understood.
This chapter covers substation automation system sas related details of substation components installed in the switchyard. Study of substation equipment and protection seminar report. Electrical faults l phase to phase l phase to ground l phase to phase to phase l phase to phase to phase to ground. Plcc applications in protection and communication plcc hardware and integrating them with the switchyard equipment switchyard control and interlocking dc power requirements for switchyard equipment dc equipment configuration and specifications dc distribution for switchyard equipment battery calculations basis. Scada and protection and control upgrades ge offers a suite of services, system hardware and high voltage hv switchyard equipment and can tailor the scope based on the customers requirements. Consequently, it is important to consider equipment removal routes during the structure layout. Secondary equipment like protection relays and terminal units, typically placed away from the switchyard inside panels of a control room, protect, control and monitor the primary equipment. When a fault occurs within the boundary of a particular zone, then the protection system responsible for the protection of the zone acts to isolate by tripping the circuit breakers every equipment within that zone from the rest of the system. We can present this substation training to your electrical engineering and maintenance staff, through our live online training platform, tailored to your specific equipment and requirements. Listed are electrical substation equipment like transformers, busbar, isolator, capacitor bank, switchyard etc joined together to deliver power supply to consumers.
Study of substation equipment and protection seminar. The circuit breakers can be operated manually as when required and it can also be operated autometically during over current and short circuit or any other faults in the system by sensing the. In principle, wherever a cable enters an equipotential zone, equipment connected to that cable is exposed to possibly damaging surges. Under abnormal conditions, switchgear equipment automatically disconnects faulted equipment from the rest of the power system as soon as possible, in order to minimize damage. Personal protective grounding for electric power facilities. Anyone wishing to make further use of ed material, by itself and apart from this text, should seek necessary permission directly from the proprietors. Mesh scheme line or transformer circuit disconnect switches may then be used to isolate the particular circuit and the mesh reclosed. Oilfilled power transformers also pose the largest fire risk in any substation. The nec also covers minimum requirements for special occupan cies including hazardous locations and special use type facilities such as healthcare facilities, places of. Study of substation equipment and protection seminar report pdf ppt download abstract. Complicated distribution substations can be found in the downtown areas of large cities. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Setting procedures are only discussed in a general nature in the material to follow. Commissioning process for new substation equipmenthayes. Army, usa, technical manual tm 58116, electric power plant design. Protective relaying philosophy and design guidelines pjm. Protective relaying philosophy and design guidelines.
Fundamentals of electrical substations and switchgear. Moving from conventional to intelligent substations. Bureau of reclamation infrastructure services division hydroelectric research and technical services group denver, colorado 5f. Insulators are used in substations for avoiding contact with humans or. Increased reliability through surge protection and limiting fault currents due to the unique system characteristics, operating range, and functions desired in a particular substation, a variety of components, devices, and equipment have been developed by vendors with various ratings. Occupational safety and health administration osha 315112r. Personal protective equipment ppe general the purpose of personal protective equipment ppe is to protect employees from exposure to work place hazards and the risk of injury. Personal protective grounding for electric power facilities and power lines 5c. Distribution substation protection needs above a minimum protection needed to avoid injury to people and damage to equipment, the level of protection of a substation is determined by how critical the loss of power is to the load. An analysis was performed to evaluate the voltage transferred to control circuits located in underground conduits running from the switchyard to the generating plant. Power factor compensation equipment static var compensators harmonic filters equipment design and selection of ratings layout of these equipment in ahaving an switchyard protection design for substation brief overview of protection over current protection protection coordination protection of transformers. Study of substation equipment and protection seminar report pdf ppt download these may be hydro, thermal, atomic etc.
Sas responsibilities include the protection of primary and secondary equipment from temporary over. Guidelines for power plant equipments to attract wider participation by equipment suppliers. The ergon energy design philosophy is to provide substations. Arrangement of switching devices and busbars in switchyard. Nevertheless, the protection schemes were complicated, expensive, and became more so with the. Reliability assessment of protection system for switchyard. The purpose of this paper is assessing the reliability of the protection system for a switchyard by faulttree analysis. The offsite power system includes all transmission lines connected to the switchyard, the switchyard equipment overhead buses, circuit breakers, disconnect air switches, auxiliary transformers, and ends at the input terminals of the switchgear circuit breakers. Evaluation of rolling sphere method using leader potential. These are having a function of protecting equipment of substation. Sep 16, 2012 to provide an earth mat for connecting neutral points, equipment body, support structures to earth. Switchyard equipment and structure be designed to safely withstand earthquake acceleration. Earthing guide for surge protection mtl instruments. The loss of electrical power to a hospital is very serious while the loss of power to a residence is inconvenient.
Nevertheless, the protection schemes were complicated, expensive, and became more so with the addition of more elements on the bus, bus sectionalizing breakers and substation bus tie breakers. The voltage transferred to control circuits during faults and other transients is caused by a. Operation of two circuit breakers is required to connect or disconnect a circuit and disconnection involves opening the mesh. Earthing guide for surge protection 1 earthing for surge protection of electronic equipment 1. The equipment like bus bars, isolator, power transformer etc. Switchyard 2pdf transformer electrical equipment scribd. An electrical substation is the component of a power system with which voltages are transformed for the transmission, distribution, transformation and switching of power. The switchyard is located approximately 850 feet southwest of the right abutment of the dam, and approximately 170 feet higher than the top of the dam. Switchyard level, equipment and interfaces substation. Above a minimum protection needed to avoid injury to people and damage to equipment, the level of protection of a substation is determined by how critical the. A circuit breaker is used as a protection device to interrupt fault currents automatically, and may be used to switch loads on and off, or to cut off a line when power is flowing in the wrong direction. Substations generally contains transformers and have switching, protection and control equipment. Circuit breakers disconnect circuits or equipment from the.
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