Thus, this is all about an overview of the electrical isolator. Design guide for rural substations usda rural development. Electrical substation engineering and practice pdf knife. The first obvious difference is that the blades of the disconnect switches and the earthing switches installed in a gis substation are surrounded by. Our product line includes construction and switching.
Any transient disturbance, such as lightning stroke terminating on a phase conductor can be analyzed by use of traveling wave. There is numerous electrical substation components like outgoing and incoming circuitry each of which having its circuit breakers, isolators, transformers, and busbar system etc for the smooth functioning of the system. In addition to being used on bus supports, many switch manufacturers offer maclean station posts on switches. All of which are manufactured under international standards such as iec and ansi among others. Composite insulators in substations need to face different special environments, such as some regions with strong ultraviolet, strong sandstorm, large temperature difference between day and night, coastal saltfog and so on. We offer a wide array of products with applications across many industries. Puncture voltage of insulator shall be greater than dry flashover voltage of respective isolators. The female type contacts are fixed on the top of the other post insulators which fitted at both sides of the central post insulator. Our post insulators are mainly exposed to pressure, bending and torsional forces during operation and. Gostr certificate for the full range of longrod porcelain lapp insulators gostr certificate for the full range of post ceramic lapp insulators s. A gasinsulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. Vuspec summary ieee power substations standards collection included active standards covering switching stations, transformer stations, and generating station switchyards. Isbn 9780738155296 stdpd95629 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior. A substation is part of the electric grid and connects two or more transmission andor distribution lines.
What type of isolators are used in electrical substations. Hps products are also used in the civil construction, transportation, gas and water industries. An electrical substation is a part of the electrical installation that includes the terminations of the transmission or distribution lines and switchgear, and which may. The design of the entire substation was made keeping in mind the most basic requirements of a proper substation including the civil and domestic requirements. The key steps in the substation designing include switchingsystem, planning and placing of equipment, selection of components as well as ordering, support of engineers, structural design, the design of electrical layout, protection of relay, and major apparatus ratings. Electrical substation components, workings and their functions. An electrical substation is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or the reverse using transformers. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Application requirements of composite insulators for substation. The most commonly used material for the manufactures of insulators is porcelain. Gas insulated substation ppt pdf presentation gas insulated substations gis is a compact,multicomponent assembly enclosed in a ground metallic housing in which the primary insulating medium is compressed sulphur hexafluoride sf6 gas. Ieee substations standards collection is a single source for design construction and operation of power substations. Our offer includes solutions in isolation and protective equipment for use, distribution and transmission of energy. What structural engineers should know about substation rigid bus design.
The characteristics of this isolator include it is an offload device, operated manually, deenergize the circuit, entire isolation for secure maintenance, includes a. Operation and maintenance of a gas insulated substation. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Substation insulators include hollow core insulators and station post insulators. Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. They support the conductor or busbar and confine the current to the conductor. There is numerous electrical substation components like outgoing and incoming circuitry each of which having its circuit breakers, isolators. Westinghouse type rsl rectangular coil core form liquid. From standard solutions to custom designs, we offer reliable, costeffective products for mechanical, electrical, digital, analog, miniature, and harsh environment. Match industry bil ratings since industry practices vary widely in the choice of insulator levels in the design of ehv substations. What structural engineers should know about substation. Specification substation power transformer standard number. Hubbell power systems is a proud member of the hubbell family.
The electrical substation design is a complex method with full of engineer planning. The central post insulator carries a tubular or flat male contact which can be rotated horizontally with rotation of central post insulator. Fsk russian homologation lapp post ceramic 330750kv. For example, when replacing a tr 288 porcelain unit with a composite insulator, the given composite insulator deflection 2. Operation of a gis substation involves the same principles as operati ng an air insulated substation ais even though the different active elements are physically arranged differently. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. Electrical substation engineering practice s rao pdf is it the case that polemount transformers are called substations in the us.
It was introduced in 1931 to provide the electric power industry with switch and bus insulators having superior performance, strength and longevity required for substation operations. For voltages up to 145 kv system hand operated isolators are used whereas for higher voltage systems like 245 kv or 420 kv and above motorized isolators are used. Substation insulators archives maclean power systems. A substation that has a stepup transformer increases the. The main purpose of this paper was that to compare design of post insulators and their performance of different post insulator the relative performance of different insulator materials used in substation as lightning arrester, current transformer and potential transformer. This document outlines the primary design standard for transgrid substations. Substation outdoor insulation solutions and application. Db 48150 page 1 type rsl rectangular coil core form liquid immersed substation transformers oafuture fa. A substation is a part of an electrical generation, transmission, and distribution system. This bulletin provides a basic design guide and a reference tool for designing rural substations. Fundamentals of electrical substations and switchgear.
The electricity substation is a network of electrical equipment which is connected in a structured way in order to supply electricity to end consumers. Study and analysis of insulator used in substation. The ratings apply to all new substations and the refurbishment of existing ones in or associated with the high voltage transmission network. Lapp station post insulators are wellsuited to high voltage and ehv switch and bus construction because of their strength, rigidity and adaptability to a wide range of stack heights and bil ratings. When a fault occurs in a substation, then isolator cuts out a portion of a substation. Electrical substation components list diagram, working.
Electric power may flow through several substations between generating plant and consumer, and may be changed in voltage in several steps. Oilfilled equipment in substation ieee 9801994 r2001. Insulators catalog about hubbell power systems hubbell power systems hps manufactures a wide variety of transmission, distribution, substation, oem and telecommunications products used by utilities. This will need to be assessed for each strung bus section and may require additional information from transmission line designers. Ieee guide for the design and installation of cable. This rod type contact is also called moving contact.
The design is then submitted to our mentor for verification keywords. Substation arrangements have to include adequate space for the installation and possible removal of large pieces of equipment such as power transformers and power circuit breakers. Home technical articles oilfilled equipment in substation ieee 9801994 r2001 high cost transformer oil is leaking from a transformer a number of electrical apparatus installed in substations are filled with oil that provides the necessary insulation characteristics and. In accordance with the standards iec, ansi, csa and other certifications we manufacture singlecomponent series up to a length of 90 inches and voltage levels up to 1100 kv. If you are choosing lower insulation level, pay close attention to the ratings of surge arrester and its install location. Ieee guide for the design and installation of cable systems in substations. In this country a substation is on the ground its just called a transformer if its on a pole. Ieee guide for the design and installation of cable systems. The station post is an original design by lapp insulators.
Technical guide the mvlv transformer substations abb group. Threephase enwrapped gas isolated switchgear applies to switchgear with the three phases enwrapped in a common case. Substation insulators mps offers a wide variety of standard and high strength silicone station posts from 7. Choose standardized bil rating basic lightning impulse insulation level for the substation from ieee. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers.
Insulators used for highvoltage power transmission are made from glass, porcelain or composite polymer materials. I have started a section on the design of substations with relation to protection. Environmental impacts of substations wisconsin public service. Power substation design calculations a checklist of 18.
The design of the isolator shall be such that pressure due to the contact shall not be transferred to the insulators after the main blades are fully closed. This definitio n typically relates to high voltage switchgear and control gear. Torsoin strength for npp20xg series is 12000 incheslb. Replace previous bulletin 651 with this bulletin and file with 7 cfr part 1724. Isolator west bengal state electricity transmission. This specification applies to pin, strain shackle, line post and long rod insulators, which will be installed on 3 phase 0. Transgrid publishes this information under clause 5. Results are incorporated in the following drawings. Vuspec page 3 ieee 12402000 r2012, ieee guide for the evaluation of the reliability of hvdc converter stations ieee 12462011, ieee guide for temporary protective grounding systems used in substations. Urban substations are usually built in brick, whereas rural ones are often installed externally directly on the mv pylon.
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