The transformer does this by linking together two or more electrical circuits using a common oscillating magnetic circuit which is produced by the transformer itself. Bhumkittipich abstract this research presents a design of transformer bushing insulation at highvoltage wire connection side. 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. Highvoltage transformers are some of the most important and expensive. System conditions the equipment shall be suitable for installation in supply systems of the following characteristics. Dielectric strength means the maximum capacity to withstand voltage of insulating oil. I was responsible for making a 33kv outdoor electrical substation for my factory. Because hot oil is lighter than cold oil, it tends to rise inside the core. Table 1 provides an overall equipment list for the projec t. A varying current in the primary winding creates a varying magnetic flux in the transformers core and thus a varying magnetic flux through the secondary winding. Principle of equipments transformer a static electrical machine used for transforming power from one circuit to another circuit without changing frequency is termed as power transformer.
Ht panel wiring inside wiring for a 33kv ht panel in a. There is no high voltage line because its just using ac 220v and dc 110v for controlling outdoor 33kv vcb and some other component like transformer tap changer. The scope of transformer types starts with generator transformers and ends with distribution transformers. Follow instructions in the transformer manual carefully. Pdf design of 33 kv transformer bushing insulator from nr and. Ecoenergy and materials science and engineering symposium. A transformer operates on the principals of electromagnetic induction, in the form of mutual induction.
Our engineering teams cover electrical craftsmen, fitting teams, jointing teams, cable installation teams, design engineers and. Transformer, operation, testing and maintenance 33kv and below 9. The transformers are generally used to step down or step up the voltage levels. A wide variety of 11kv 33kv power transformer options are available to you, such as power, electronic, and high frequency. What is the bdv breakdown voltage of a 33kv transformer.
Technical specification for 3311kv power transformers apdrp scheme page 3 of 72 4. Pdf work specification for the construction of 33kv. Design study for 3311 kv substation, distribution and protection in. Otherwise, its just voltage and the difference is a factor of 3 between them. Specification substation power transformer standard number. Ekundayo t proceedings of the world congress on engineering and computer science 20 vol i wcecs 20, 2325 october, 20, san francisco, usa isbn. Electric power transformer engineering pdf download free. A transformer is connected to main bus though a bus coupler. 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.
Electrical power substation engineering and layout. This specification covers design, manufacturing, testing and delivery of the three star rating 100 kva, 110. Transformers which are directly connected to the generator of the power station are called generator transformers. The scope of this work is to deliver the material and including the installation as well as the testing and commissioning. Frequency 50hz 33kvnominal system voltages 11kv 400230v maximum system voltages. At the same time the oil in the tubes is cooled by the surrounding air and becomes heavier and falls, being replaced with the hot oil from the core.
We provide reliable, cost effective, technical expertise and value. Global transformer capabilities schneider electric has a large network of transformer manufacturing plants around the world, producing medium power transformers, distribution and drytype transformers, amorphous core and. Depending upon the availability of resources these stations are constructed. Medium voltage drytype transformers medium voltage mv transformers are static electrical device that transfers energy by inductive coupling between its winding circuits. For fulfilling these huge power demands the modern time requires creation of bigger and bigger power generating stations. Secondary winding is connected to 33kv tubular bus bars. This document specifies the electrical tests performed on 4, 27, and 33 kv ac feeders to verify the restoration of adequate electrical insulation levels and the. A 66 kv33kv,star delta transformer is connected to the 66kv bus bars. First of all, it is not true that all the transmissions and distribution voltages are multiple of 11. The layout, single line diagrams and the typical general arrangement drawings included in the tender document shall serve as a guideline to be followed as closely as possible by the tenderer and must be elaborated in contractors engineering design. Power and distribution transformers schneider electric.
Pressure relief valve, with manual bleeder and automatic resealing, set to. As such, when the transformer is working the oil continuously cycles through the transformer. Reliability assessment of 33kv kaduna electricity distribution feeders, northern region, nigeria y. Design of 33kv transformer bushing insulator from nr and. 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. American journal of engineering research ajer 2014 w w w. To step down the 33kv primary voltage to 11kv suitable for distribution purpose. Available online at 9th ecoenergy and materials science and engineering symposium. Why electric power transmission is multiple of 11 i. A wide variety of 33kv voltage transformer options are available to you, such as instrument, power, and electronic. Engineering services as a leading uk high voltage electrical contractor.
Mutual induction is the process by which a coil of wire magnetically. Technical specification construction of 3311 kv primary substations. In transformer oil has mainly two purposes, first for insulation, second as cooling of. Electrical substation now days the electrical power demand is increasing very rapidly.
Transformers substation electrical drawing 33kv jobs. Owners supply materials osm 3311 kv power transformers, station 330. Adesina and others published work specification for the construction of 33kv overhead lines across a lagoon using equal level deadend lattice tower supports find. Download electric power transformer engineering pdf book free online from electric power transformer engineering pdf. Siemens energy sector t power engineering guide t edition 7. The power from t1, t3 is fed to a 33kv bus and the power from t2, t4 is fed to a 11kv bus. Design study for 3311 kv substation, distribution and. Circuit breakers and isolators are connected on each side of transformer. Before proceding with transformer measurements the test engineer will. The transformer shall conform in all respects to highest standards of engineering, design, workmanship, this specification and. If the circuit of this secondary winding is closed, then a current will flow through it.
What is the difference between 11kv and 33kv transmission lines. The objective is to achieve the greatest customer satisfaction with costef. For all transformers of in this specification, with a secondary voltage of 33 kv and below, the lineend bushings shall have a minimum insulation. 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. The main equipment in fahari substation consist of. This test shows the dielectric strength of transformer oil. Transformer, operation, testing and maintenance 33kv and. Transformers have been used at powerplants since the inception of. Image 22kv voltage transformer instrument transformer technologies provides a range of oil filled, outdoor, post type, voltage transformers for distribution substations, protection and metering. This volume provides timely, practical advice to those seeking to better understand how transformers work, how they are best. Graphic representation of faults that occurred on 33kv system in ekiti state20 iv results and discussion the following tables provide a graphic representation of the physical state of the components of the 33kv network in ekiti state. Let us use electrical symbols to help visualize this.
Providing engineering drawings related to foundation details. Substation gets 440kv supply through 33kv440kv station transformer connected to 33kv bus bars. Single line diagram33kv11kv substation this is the easy way to understand the working of substation. Now, both of them are medium voltage transmission line. Technical guide the mvlv transformer substations abb group. 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. Technical specification construction of 3311 kv primary. Electric power transformer engineering, third edition expounds the latest information and developments to engineers who are familiar with basic principles and applications, perhaps including a handson working knowledge of power transformers. Pdf this research presents a design of transformer bushing insulation at high voltage wire.
According to faradays law of electromagnetic induction, there will be an emf induced in the second winding. The power is then fed into a 33kv bus from which different loads were tapped. To step down the 33kv primary voltage to 11kv suitable for distribution. This is the basic working principle of a transformer.
Description of material units quantity delivery quantity from the date of the order within 60 days consignmenti within 120 days consignmentii within. Specification substation power transformer horizon power. These power generating stations may be hydroelectric, thermal or atomic. Manager engineering services regional asset managers manager capacity management services. Standard item 1 iec60056 is 118 iec 62271 1 circuit breaker 2 iec 62271 100,200.
Method statement for installation of 33kv power transformer. Faculty of engineering department of electrical and information engineering. I have a 500kva generator supplying 33kv line with a distance of 55km, the line has 7 transformers at the receiving i. The winding which receives electrical power from the source is known as. This purpose of this method statement is to apply a proper way of installing or placing the power transformer in the project. Electrical substations can also be divided into public and. Electrical fault analysis of 33kv distribution network a.
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