Directional earth fault protection for transmission lines need and operational experiences v. Substations design of substations to be based on the following xii. Study of substation equipment and protection seminar report pdf ppt download these may be hydro, thermal, atomic etc. Sf6 gis switchgear up to 400 kv now available for indoor applications oil, low volume oil, and airblast older types for high. Failure of 400 kv sf6 current transformer bphase at 500 kv. All equipments shall also perform satisfactorily under various other electrical. Mar 16, 2019 220kv 66 kv electrical substation all explained live tour.
Overvoltage protection of large power transformers a real. Conclusion the overview of this project is about the various techniques involved in 400 kv. The power is received on 400 kv busbar double main and transfer bus scheme. The steel structure columns and electrical equipment shall be installed on steel supports with rcc foundation. Sf6 circuit breaker types and operation of sf6 circuit. Transformer protection application guide this guide focuses primarily on application of protective relays for the protection of power transformers, with an emphasis on the most prevalent protection schemes and transformers. A design for a simple 2 kv sub with one incoming 2 kv. An electrical substation is a part of an electricity generation, transmission. Iec and ieee standards for highvoltage switchgear and. Busbar protection busbar differential protection scheme. Overvoltage protection of large power transformers a.
Toolssuchaschippinghammer,files,sandpaper,steelwirebrush, windscreen. The new transmission circuit extends from teps tortolita substation to the saguaro switchyard and parallels an existing 500 kv line. Coordination of relay protection system of a biomass power. The availability willis 2000 can be defined as the fraction of time that the electric power is available in a certain point in the network during a given time interval. The work consisted of the entire green field execution of 2x315mva 400220kv substation comprising of 2 nos.
Model study of lightning protection of 110 kv substation. Manual for transmission lines and substation construction. Aug 09, 2015 400 kv switchyard of ramagundam super thermal power station is the most vital switching station in the southern grid. September 12, 2006 eb20050501 exhibit g1 tab 6 schedule 1 page 1 of 8 1 cost data for low voltage switchgear 2 compensation 3 4 1. Lightening arrestors capacitive voltage transformer 400 kv switchyard ntpc safe guards the equipment by discharging the high currents due to lightning and to discharge the high voltage surges in the power system due to lightning to the ground. Pdf model study of lightning protection of 110 kv substation. Eci performed complete physical and electrical design at saguaro for the new 500 kv line termination in a breakerandonehalf configuration. These relevant electrical standards contain the technical specifications that national grid currently requires users to meet. Iec 60529 degrees of protection provided by enclosures ip code. What is the difference between a substation and a switchyard.
This specification intends to cover the following activities, services and works in respect of 400 kv switchyard consisting of gas insulated switchgear, air insulated switchgear pothead switchyard of tapovan vishnugad hepp, detailed scope of work under this package is listed in sub sectioniii of parta. Here sf6 gas was compressed and stored in a highpressure reservoir. Electrical clearance in substation electrical notes. Miniature circuit breakers used to protect control circuits or small appliances may. Operation of hvdc station selection of mode of operation joint separate. The point to point testing of all signals from switchyard equipment terminal to substation controller shall be in the scope of bidder. Protection, metering, control and telecommunications. Download download one and half breaker scheme operation pdf read online read online one and half breaker scheme operation pdf bus bar arrangement ppt substation bus schemes pdf one and half breaker scheme ppt bus bar arrangement in substation pdf two main and transfer bus scheme busbar schemes pdf breaker and a half definition how one and half breaker scheme works the 1. Substations involves many earthlings through individual electrodes, which will have fairly high resistance. The substation is fed 16 mw power from 3 generating stations a,b,c through 400 kv single circuit lines working at around 87% loading. 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. In early days only conventional over current relays were used for busbar protection. An example 110 kv substation is used for test case. At some locations completely in door substations even at 400 kv.
But it is desired that fault in any feeder or transformer connected to the busbar should not disturb busbar system. Design of earthing system for 400 kv ac substation a case study. Lightning protection to be provided using lightning masts andor shield wires. The balance 8 bays in 220kv system commissioned during 197983.
The fill for embankment ranges up to 27 feet in depth and the cut for excavation ranges up to 24 feet in depth. Manual for transmission lines and substation construction and. Resident project manager indiabangladesh interconnector project. One and half breaker scheme operation pdf telegraph. Substations generally comprise of switchgear, power transformer, control, protection, monitoring and automation equipment. Our owners engineering services interconnected a 400kv hvdc system to six countries with six gis substations, 1,000 km of ac lines, 28 mi of submarine cables and three backtoback hvdc converter stations. The dependency of secure power is increasing in the society which leads to higher demands on the availability of electric power. Study of substation equipment and protection seminar report. Cable trenches to be routed for ease in maintenance and movement. Design of earthing system for 400 kv ac substation design of earthing system for 400 kv ac substation. Industrial summer training report on uttar pradesh power corporation limited 2202 kv substation barahuwa gorakhpur submitted in partial fulfillment of the requirements for the award of degree of bachelor of technology in electrical engineering ee submitted by ashutosh srivastava. Substation and switchyard both are different and these two switchyard is the inter connector between generation and transmission, and same voltage is mentained in switchyard, substation is the inter connector between transmission and distribution.
Ep 99 00 00 08 sp substations fire protection and detection standard version 2. Direct stroke lightning protection is to be provided with the use of lightning masts or. Analysis and measurement of electric field exposure inside 500220 kv air insulated substation. Construction of substation 400110 kv vranje4 and the financing agreement leskovac2 total budget 28 m ipa budget. The ergon energy design philosophy is to provide substations. Jagannath abstract this paper attempts to bring out the necessity of activating directional earth fault protection in numerical distance relays and also highlights an operational problem with this. Design of earthing system for 400 kv ac substation. Due to b phase ct failure of bus coupler bay and actuation of bus bar protection, 220 kv sagardighi new sagardighi dc tripped along with 400220 kv ict i and unit i at sagardighi. By this we get to know about the operation of different equipments in switch yard and its maintainance. For 400 kv and higher voltage levels, it shall be isolated.
The extension of switchyard shall comprise of steel structures for 04 nos. Coordination of relay protection system of a biomass power plant spin valis. The principles of this document applies to equipment connected at other voltages. Pdf analysis and measurement of electric field exposure. Catching falling conductors in midair detecting and. Abb library is a web tool for searching for documents related to abb products and services.
However, it should be recognised that the requirements contained herein cannot be completely exhaustive and, in certain circumstances, there may still be specific scheme. Provide double insulator strings for upper level for safety reasons and to avoid busfaults due to conductor snapping. Switchyard lecture1 electrical substation insulator. Substations fire protection and detection standard ep 99 00 00 08 sp. Report on industrial summer training on 220 kv substation. Presentations ppt, key, pdf logging in or signing up. Second overcurrent protection system coordination check. Operational description of 400kv switchyard ntpc ramagundam rstps. Breaker 400kv and 8 bay 220kv including all civil works with control room building, auxiliary buildings, road, drainage and other auxiliary systems like fire fighting, air conditioning. During operation of sf6 circuit breaker, this highly compressed gas is released through the arc in the breaker and collected to a relatively lowpressure reservoir and then it is pumped back to. 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. Introduction on the 18th of june 2002 a heavy thunderstorm swept over northjutland in denmark resulting in a serious fault in energinet. Functionality and environmental protection design and material assure extreme low leakage rate iec 62271203 highvoltage switchgear and controlgear part 203.
Report on industrial summer training on 220 kv substation 1. The contractor shall take into account the possible ac line discharge energy. Power system protection relays power system protection relays accept signals representing the. All the 400 kv isolator shall be electrically ganged operated by separate operating mechanism to ensure that operations of all the three poles are simultaneous. Directional earth fault protection for transmission lines. Pgcil, new delhi 400220 kv gis substation with central. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Iec and ieee standards for highvoltage switchgear and controlgear present situation and future evolution mumbai, january, 2008. Setting procedures are only discussed in a general nature in the material to follow. Conclusion the overview of this project is about the various techniques involved in 400 kv switchyard of ramagundam power plant. This switchyard is heart of the orissa grid for which state load dispatch center sldc was. These practices and procedures, when properly implemented, will minimize or prevent erosion and sediment pollution from adversely affecting sensitive resources, such as, streams, ponds, lakes, wetlands, and natural vegetative.