The transformer may be outside the housing which contains the mv and lv switchboards, separated by a corridor. Basic substation layout incoming subtransmission lines electric power path through substation. The connection of an electrical installation to a mv utility distribution network is always realized by means of a dedicated mv substation usually designed main substation. There are also packaged mv lv substations that utilize standard indoor equipment mounted inside a weatherproof enclosure. Technical guide the mvlv transformer substations abb group. These recommendations will take into account the critical nature of the substation to the operation of the wind farm, while also considering costs of the structures when recommending standards. Construction standards for mv substation buildings esb networks. Design guide for rural substations usda rural development. Medium voltage termination box shall be part of transformer and shall be located as. Mv lv substation transformer that represent the last step of bringing transformation to the low voltage and ensuring the protection and monitoring of the network. Hv substation project brief history et bihl d i 1987 f th il ti f l hv mv d established in 1987 for the realization of complex hv, mv and lv projects.
Any changes that may arise will be reflected in the next edition. This course is based on terms used in ieee and iec regulations. Substation transformer installation, operation and. This allows establishing a modular concept for the substation arrangement which makes for an optimized execution process and short substation. The first step in planning a substation layout is the.
Typical earthing layout of lv mv substations youtube. The substation design manual is not intended to replace asset management standards, but rather to act as a reference document that cross. Ehvehv and ehvhv substations may have several configurations topologies, depending on the requirements of the continuity, the reliability and the quality of power supply. Several crucial terms are for better understanding of the presented material. 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. The power will be provided by connecting the factory to 33 kv mv voltage level. For technical and economic reasons, the service voltage of medium voltage distribution networks rarely exceeds 36 kv. Pdf design of mvlv substation transformer researchgate. Certificate of completion for medium voltage mv substation buildings. Distribution substation a distribution substation transfers power from the transmission system to the distribution system of an area. Medium voltage unit substations documents and downloads.
Specifying hvmv transformers at large sites for an. Medium voltagelow voltage mv lv transformer substations 1. The numerous siemens highvoltage substations that are in operation worldwide comprise grid access solutions for wind farms as well as exceptionally compact solutions that bring high voltage right into the centers of consumption and ultrahigh voltage substations for the backbones of transmission grids. Airinsulated substation elearning ge grid solutions. How to apply for electricity connection this handbook is published by sp group march 2020 procedures and requirements highlighted in this handbook are correct at the time of printing. Pdf a substation is a part of an electrical generation, transmission, and distribution system. Hv mv transformer substations for distribution purpose with similar substation schemes and requirements are more likely to be of standardized design. Technical specification construction of 3311 kv primary substations. Substation and right of way layout shall be designed to avoid the. All units are constructed for indoor or outdoor mounting on a concrete pad with high and low voltage cables entering operating compartments through enclosed sidewall mounted bushings unittype transform. Design of earthing grounding system in a substation grid. Maintenance of mv switchgear, transformers, ring main. The sf6 emission impact theoretical elearning training provides the needed knowledge for the prevention of contaminated sf6 emissions and the related health hazards for personnel handling this highly potent greenhouse gas. Learn about the features, benefits, and applications for the package substations free breathing and hermetically sealed liquid filled transformers upto 3mva, 11kv complete with mv lv switchgear.
Equivalent diagram of a power system with an earth fault. Substation transformers are designed for installation on threephase systems. Sirius 2kv substation preliminary design report document number revision no date page pdf. In high and medium voltage air insulated substations ais the electromagnetic field, which causes are the static charges of bare cable and conductors and by the atmospheric conditions surges, induce voltages at nolive parts of the installation that create potential differences between metallic parts and ground and also between different points of. Whenever light surges occur then, a highvoltage pass through these electrical components causing damage to them either temporary or permanent damage based on the amount of voltage surge. Medium voltage 12 kv css can be provided with different. Most substations currently being designed and constructed use lowprofile structures and rigid buswork, particularly for lowvoltage distribution substations or in areas with natural environmental screening. Customer substation manual 6272019 preface page 7 of 82 010.
Abstract the main purpose of this paper is to acquaint the reader with various types of grounding systems prevalent in an electrical substation and their importance. Its selection affects the configuration of the substation and is made on the basis of various factors. It consists of two dead end poles to terminate the lines, two manual nonload break switches. Hv mv substation with hv utility metering for connection of a site with installed power 30 mva figure 3 basic circuit used to measure transformer short circuit impedance z t in % schneider electric data center science center white paper 258 rev 0 5 specifying hv mv transformers at large sites for an optimized mv electrical network. Tambo international airport ort 1012017 tender notice and invitation to bid t1. Medium voltage low voltage mv lv transformer substations 1. Substation design guidelines eep electrical engineering portal. Design of grounding system for an electrical substation. The following layout designs of indoor distribution substation are typical only and should not be used as construction drawings as they are presented as an example. Fundamentals of electrical substations and switchgear.
This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Transmission traditionally transmission substations have utilized the double bus single breaker dbsb configuration, which was adequate for reliability, maintenance, and. Transformers, high voltage panel, medium voltage mv panels, interconnecting cables, bus ducts, protection and metering etc. Technical data unipack compact secondary substation mars layout transformer kva 315 400 500 630 1250 type of layout mars rated voltage kv 12 kv24 kv short circuit withstand current of internal earthing network 20ka1s. Mvlv power substations design and schematics notes. Substation and right of way layout shall be designed to avoid the need for esb staff entering onto the hazardous. C substation standards typical duplex switchboard surge suppressor networks detail layout 60. Mediumvoltage circuit breakers bolted connections to bus bars or wires, especially in outdoor switchyards.
Room for rear access to the switchboards may have to be provided. This catalog includes information on special applications and products, interlock schemes, primary switchgear layouts, and secondary switchgear layouts for powerzone load center unit substations. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations. The ergon energy design philosophy is to provide substations. Sirius substation preliminary design report rev0 july 2015. Distribution voltages are typically medium voltage, between 2. Bsee and boem as to what additional standards may be applicable to offshore substation design as the agencies update their regulations. This form must be sent to esb networks when a substation is complete and ready for installation of medium voltage switchgear.
The input for a distribution substation is typically at least two transmission or subtransmission lines. These drawings are available in pdf and dwg format and. Geographical location 2 project specific requirements there will be no available 3 phase ac supply. D substation standards control switches escutcheons, lamps and developments 61.
Common configuration of ehvehv and ehvhv substations. Impact of new grid developments on substation design. The substation equipments such as conductors, transformers, etc. Pictured above is a diagram showing the typical layout of a high voltage grp electricity substation distributing 11kv power an outer ring of 70sqmm copper earthing conductor plus 4 earth rods of standard depth are shown with a 10 metre tail in the hv cable trench accompanied by a layout. Offshore substation design development of standards. Some designs achieve minimum emf emission by installing the low voltage cables and switchboard in a trench down the middle of the room. Mv collector system connected to substation via underground or overhead line the voltage is stepped up to transmission level 69 kv or above by a substation transformer facility in north america wind power plants wpp are predominantly connected to hv transmission. Simpler manual and electrical tripping only requires cancelling the permanent. As you can see, the overview is complex, but on the other hand the mvlv electrical substation is the synthesis of several design activities electrical, mechanical. In the past, large lattice and boxtype structures supporting overhead strain buses were commonly used. The same substation may have more than one type of configurations, depending of the voltage levels. Mediumvoltage shielded power cable 2 kv up to 35 kv.
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