The station post is an original design by lapp insulators. A gasinsulated substation gis uses a superior dielectric gas, sf6, at moderate pressure for phasetophase and phasetoground insulation. A substation is a part of an electrical generation, transmission, and distribution system. Design guide for rural substations usda rural development. 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. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Match industry bil ratings since industry practices vary widely in the choice of insulator levels in the design of ehv substations. 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. 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. Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. 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. In addition to being used on bus supports, many switch manufacturers offer maclean station posts on switches. Substation insulators mps offers a wide variety of standard and high strength silicone station posts from 7.
Westinghouse type rsl rectangular coil core form liquid. Substation insulators archives maclean power systems. Application requirements of composite insulators for substation. Operation and maintenance of a gas insulated substation. Substation outdoor insulation solutions and application. A substation is part of the electric grid and connects two or more transmission andor distribution lines. 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 is then submitted to our mentor for verification keywords. 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. Our product line includes construction and switching.
Our post insulators are mainly exposed to pressure, bending and torsional forces during operation and. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Oilfilled equipment in substation ieee 9801994 r2001. Study and analysis of insulator used in substation. They support the conductor or busbar and confine the current to the conductor. What structural engineers should know about substation rigid bus design.
Urban substations are usually built in brick, whereas rural ones are often installed externally directly on the mv pylon. The ratings apply to all new substations and the refurbishment of existing ones in or associated with the high voltage transmission network. 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. Isbn 9780738155296 stdpd95629 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior. There is numerous electrical substation components like outgoing and incoming circuitry each of which having its circuit breakers, isolators. Ieee guide for the design and installation of cable systems. Insulators used for highvoltage power transmission are made from glass, porcelain or composite polymer materials. 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. 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. When a fault occurs in a substation, then isolator cuts out a portion of a substation.
Hps products are also used in the civil construction, transportation, gas and water industries. Choose standardized bil rating basic lightning impulse insulation level for the substation from ieee. The central post insulator carries a tubular or flat male contact which can be rotated horizontally with rotation of central post insulator. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers. 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. Threephase enwrapped gas isolated switchgear applies to switchgear with the three phases enwrapped in a common case. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Electrical substation engineering practice s rao pdf is it the case that polemount transformers are called substations in the us. Ieee guide for the design and installation of cable. 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 rod type contact is also called moving contact. Electrical substation components, workings and their functions.
If you are choosing lower insulation level, pay close attention to the ratings of surge arrester and its install location. We offer a wide array of products with applications across many industries. Our offer includes solutions in isolation and protective equipment for use, distribution and transmission of energy. Results are incorporated in the following drawings. The female type contacts are fixed on the top of the other post insulators which fitted at both sides of the central post insulator. Fundamentals of electrical substations and switchgear. Electrical substation components list diagram, working. Power substation design calculations a checklist of 18. Vuspec summary ieee power substations standards collection included active standards covering switching stations, transformer stations, and generating station switchyards. Ieee substations standards collection is a single source for design construction and operation of power substations. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. Environmental impacts of substations wisconsin public service. Electric power may flow through several substations between generating plant and consumer, and may be changed in voltage in several steps. To avoid flashover within the substation, the insulation for strung bus associated with a feeder entry is to be greater than the feeder insulation outside the substation.
Specification substation power transformer standard number. I have started a section on the design of substations with relation to protection. This specification applies to pin, strain shackle, line post and long rod insulators, which will be installed on 3 phase 0. This definitio n typically relates to high voltage switchgear and control gear. Db 48150 page 1 type rsl rectangular coil core form liquid immersed substation transformers oafuture fa. Electrical substation engineering and practice pdf knife. What type of isolators are used in electrical substations.
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. Any transient disturbance, such as lightning stroke terminating on a phase conductor can be analyzed by use of traveling wave. Replace previous bulletin 651 with this bulletin and file with 7 cfr part 1724. This bulletin provides a basic design guide and a reference tool for designing rural substations. Hubbell power systems is a proud member of the hubbell family. Fsk russian homologation lapp post ceramic 330750kv. The characteristics of this isolator include it is an offload device, operated manually, deenergize the circuit, entire isolation for secure maintenance, includes a. Puncture voltage of insulator shall be greater than dry flashover voltage of respective isolators. What structural engineers should know about substation. Transgrid publishes this information under clause 5. The electrical substation design is a complex method with full of engineer planning. All of which are manufactured under international standards such as iec and ansi among others.
Torsoin strength for npp20xg series is 12000 incheslb. The first obvious difference is that the blades of the disconnect switches and the earthing switches installed in a gis substation are surrounded by. From standard solutions to custom designs, we offer reliable, costeffective products for mechanical, electrical, digital, analog, miniature, and harsh environment. Gostr certificate for the full range of longrod porcelain lapp insulators gostr certificate for the full range of post ceramic lapp insulators s. Technical guide the mvlv transformer substations abb group. This document outlines the primary design standard for transgrid substations. 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.
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. 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 most commonly used material for the manufactures of insulators is porcelain. 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. 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. Substation insulators include hollow core insulators and station post insulators. For example, when replacing a tr 288 porcelain unit with a composite insulator, the given composite insulator deflection 2. Thus, this is all about an overview of the electrical isolator. In this country a substation is on the ground its just called a transformer if its on a pole.
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