Established in 2012, the agency comes under the authority of the department of power. We got the power from our national grid and our mainline voltage is 33kv. The subcommittee appointed by the board under regulations, 6 to interviewrecommend to issue competency certificate and permits to the exempted candidate. Distribution substation a distribution substation transfers power from the transmission system to the distribution system of an area. At university of nairobi faculty of engineering department of electrical and information engineering. The incoming voltage level for this substation is 220kv. By this post, you will gain some very basic information for a substation. In my last post about electrical substation, i discussed what is a substation, why we need substation and the most common components for an electrical substation. Example of 3311 kv substation onsite assessment report eep. Vibration analysis of power transformers using fea of drytype power transformer. Specification substation power transformer horizon power. Jul 20, 2017 this feature is not available right now.
Transformer, operation, testing and maintenance 33kv and. Technical specification for 3311kv power transformers apdrp scheme page 3 of 72 4. Follow instructions in the transformer manual carefully. Pdf this research presents a design of transformer bushing insulation at high voltage wire. In the process, the surge impedance loading of 2 kv and 33 kv lines were calculated and they were used to estimate the maximum power that can be transferred by one transmission line. Technical specification construction of 3311 kv primary substations. For all transformers of in this specification, with a secondary voltage of 33 kv and below, the lineend bushings shall have a minimum insulation. Due to the length of the 33kv circuit, at times of higher loading, the 33kv voltage is too low at the midpoint of the 33kv circuit. Single line diagram 33kv11kv substation in hindi youtube. Nonsecurity item tender document for construction of 233kv substation on turnkey basis for supply, transportation, erection, commissioning and civil work tender no. Sn source transformer capacity load demand mw akure 2x30mva.
Units also available as a power voltage transformer for limited single phase supply. The substation would be a combination of switching, controlling, and voltage stepdown equipment. Abb is a major transformer manufacturer throughout the world and offers both liquidfilled and drytype transformers as well as services for complete life. Classification of electrical substation an electrical. The project work assigned to us was to 233 kv ehv substation electrical design.
Frequency 50hz 33kvnominal system voltages 11kv 400230v maximum system voltages. A wide variety of 33kv transformer options are available to you, such as usage, coil number, and coil structure. A critical prerequisite when it comes to the construction and erection of a building is the installation of 33kv power transformer according to the specification, plan and scope requirements. The power from t1, t3 is fed to a 33kv bus and the power from t2, t4 is fed to a 11kv bus. Mv indoor current transformer documents and downloads. Work completed at the time included the construction of the 3311 kvsubstation switchgear facility, guardhouse, fencing, exterior lighting, and installation of two 33kv to 11kv transformers 31500 kva, two auxiliary transformers, neutral grounding system, 11 kv switchgear, and 33 kv switchgear the installation of substation electrical equipment was completed prior to site. Transformers have been used at powerplants since the inception of. Faculty of engineering department of electrical and information engineering. The utility engineer must be familiar with all aspects of maintenance and testing and make use of stateoftheart tools and techniques for evaluating transformer condition. Providing engineering drawings related to foundation details.
Unesco eolss sample chapters electrical engineering vol. Dismantling, removing and transportation of 2kv33kv transformer from efls cunningham road substation. Electrical fault analysis of 33kv distribution network a. Now i will discuss the classification of an electrical substation. But 400kv, 765kv and 800kv etc are not multiple of 11 in case of electric power system generation, transmission and distribution in power lines from the generation. Image 22kv voltage transformer instrument transformer technologies provides a range of oil filled, outdoor, post type, voltage transformers for distribution substations, protection and metering.
One stop solution provider for transformer, mtm provides complete manufacturing outfit with capabilities to design, manufacture and test its products in complying with all relevant international standards. Distribution voltages are typically medium voltage, between 2. Supply in the package materials have been classified as under i. Classification of electrical substation an electrical engineer. Before proceding with transformer measurements the test engineer will. A bank of three singlephase transformers cost about 1.
Medium voltage indoor current transformers are cast in epoxy resin and designed for insulation up to 40,5kv. System conditions the equipment shall be suitable for installation in supply systems of the following characteristics. An 11kv to 33kv stepup transformer is always written. Going by knowledge and experience in this industry, i think here the question pertains to the break down voltage of transformer oil because on field or on papers whenever bdv of transformer is mentioned it is actually the. To step down the 33kv primary voltage to 11kv suitable for distribution. In case of contaminated atmospheric condition these substations can be erected for voltages upto 66kv. Transformer, operation, testing and maintenance 33kv and below. The substation, of which the equipments are installed indoor for voltages upto 11kv because of economic consideration, is called as indoor substation.
Structural mechanics equation, this paper established a finite element analysis model of drytype transformer. Singlephase transformers may be specified for hydraulic stations because of transport. Electrical calculation and electrical notes on electrical engineering. Adesina and others published work specification for the construction of 33kv overhead lines across a lagoon using equal level deadend lattice tower supports find. Structural mechanics field calculation analysis, obtained in no load and the vibration modes of the core under different load and frequency. Electrical fault analysis of 33kv distribution network a case study of ekiti state 33kv distribution network kehinde olusuyi, temitope adefarati, ayodele sunday oluwole, adedayo kayode babarinde 1 department of physical planning, federal university oye ekiti, nigeria. Distribution substations michigan technological university. The following factors are to be considered in selection the site of an outdoor type substation. Technical guide the mvlv transformer substations abb group. It is applicable to the 33kv power transmission and. Download documents for mv indoor current transformer indoor current transformers up to 40. While online diagnostic systems and computerized testing. Tender document for construction of 233kv substation on turnkey basis for supply, transportation, erection, commissioning and civil work tender no. Lv transformer electrical substation consists, therefore, of the set of devices dedicated to the transformation of the voltage supplied by the distribution network at medium voltage e.
What is the bdv breakdown voltage of a 33kv transformer. It is widely used in compact fully insulated ring network switchgears such as abbsafe ringsafe plus. The capacitor will inject reactive power and this will flow from the capacitor towards each 2 33kv transformer. Highvoltage transformers are some of the most important and expensive. Parallel operation of single phase transformer 34 fig 6. Medium voltage products technical guide the mvlv transformer. Lzck series split core current transformer is suitable forcurrent measurement and microcomputer protection of electrical equipment in 10kv and 35kv ac power system. The input for a distribution substation is typically at least two transmission or subtransmission lines. Product range of siemens transformers generator and system transformers above 2. Why electric power transmission is multiple of 11 i. The power from main bus was fed into a 20mva transformer which. The project work assigned to us was to design a 233 kv ehv substation. Design study for 3311 kv substation, distribution and protection in. Transformer, operation, testing and maintenance 33kv and below 9.
Ecoenergy and materials science and engineering symposium. First of all, it is not true that all the transmissions and distribution voltages are multiple of 11. Sep, 2018 a critical prerequisite when it comes to the construction and erection of a building is the installation of 33kv power transformer according to the specification, plan and scope requirements. It is therefore proposed to install a 33kv capacitor. Pressure relief valve, with manual bleeder and automatic resealing, set to. Difference between power transformer and main differences. Abb offers a complete range of power and distribution transformers designed to grant the reliability, durability, and efficiency required in utility, industrial, and commercial applications. Pdf work specification for the construction of 33kv. Basics, maintenance, and diagnostics vii contents continued page 4. Dismantling, removing and transportation of 2kv33kv. The utility engineer must be familiar with all aspects of maintenance and testing and make use of. Tranformer protection and ct electrical engineer boards. Specification substation power transformer standard number. Then ct current transformer and we use ct for measuring the line current from ht panel.
Transformers substation electrical drawing 33kv jobs. We considered incoming power at 2 kv and the power was transferred to main bus through isolatorcircuit breakerisolator combination. Electrical design of 233kv substation electrical engineering. About 53% of these are transformers, 4% are power distribution equipment, and 0% are other electrical equipment. Owners supply materials osm 3311 kv power transformers, station 330. Jun 20, 2018 single line diagram33kv11kv substation this is the easy way to understand the working of substation. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. Description of material units quantity delivery quantity from the date of the order within 60 days consignmenti within 120 days consignmentii within. Electrical fault analysis of 33kv distribution network a case study of ekiti state 33kv distribution network kehinde olusuyi, temitope adefarati, ayodele sunday oluwole, adedayo.
Electrical substations can also be divided into public and. It can be designed to step up or step down voltages and works on the magnetic induction principle. Technical specification construction of 3311 kv primary. In this post, i will discuss all the electrical equipment that we practically used in our outdoor electrical substation first of all our demand load form, the government grid line was 3mw and there was a guideline for making this substation like transformer must be installed at the outdoor, well grounding. The power from main bus was fed into a 20mva transformer which stepped the voltage down to 33kv the power is then fed into a 33kv bus from which different loads were tapped. I was responsible for making a 33kv outdoor electrical substation for my factory. Now come to the 33kv vcb vacuum circuit breaker and this vcb is responsible for turn off the 33kv line if there is any problem with power transformer incoming and outgoing side but we can control this vcb form ht panel. Fuji tusco transformers are the result of an extensive engineering effort over many years along with the most. Mtm offers wide and full range products and services to meet customer requirements. Siemens provides the right transformer for every need from compact distribution transformers to large power transformers with ratings far above 1,000 mva. Mv indoor current transformer indoor current transformers up to 40. Pdf design of 33 kv transformer bushing insulator from nr and. Technical specification construction of 3311 kv primary sub. Chan encyclopedia of life support systems eolss remote control facilities to enhance the security of supply.
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