8. TESTING POWER TRANSFORMERS High-voltage transformers are some of the most important (and expensive) pieces of equipment required for operating a power system. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system. 8.1 OVERVIEW TRANSFORMER a static (or stationary) piece of apparatus by means of which electric power in one circuit is transformed into electric power of the same frequency in another circuit. the physical basis of a transformer is mutual induction between two circuits linked by a common magnetic flux. consists of two inductive coils which electrically separated but magnetically linked through a path of E B / E A = V B / V A = N B /N A = K. This constant K is known as voltage transformation ratio. (1) If N B >N A , that is K>1 , then transformer is called step-up transformer. (2) If N B <1, that is K<1 , then transformer is known as step-down transformer. Again for an ideal transformer, Input V A = output V A. A power transformer is used to convert power from one circuit to another without changing its frequency. They are usually large in size and do not have any rotating or moving parts. The transformer works on the principle of mutual induction and requires an AC supply. Power transformer ratings are as follows 400kv, 200kv, 110kv, 66kv, 33kv. ABBYY PDF Transformer is a powerful but easy-to-use PDF conversion utility that transforms any types of PDF files into editable formats without retyping and reformatting. * Process PDF files from any source, including scanned PDFs and PDFs generated from within computer applications * Open PDF files directly in Word and Excel for immediate editing A transformer basics operate on the principals of "electromagnetic induction", in the form of Mutual Induction. Mutual induction is the process by which a coil of wire magnetically induces a voltage into another coil located in close proximity to it. The features of the ideal transformer are as follows: 1. The ideal transformer has windings of perfect conductivity - there are no I^Rlosses in either the primary or secondary coils. 2. When endowed with a magnetic core, the ideal transformer exhibits no core losses. That is, energy dissipation from hysteresis and eddy currents in the core iszero. PDF Transformer allows users to transform their contracts, brochures, archived documents, or any other document from PDF into popular Microsoft Office applications while retaining all layout and formatting. With the proliferation of PDFs, PDF Transformer helps users increase their productivity while eliminating the need for re-typing. A transformer is an electrical device that, by the principles of electromagnetic induction, transfers electrical energy from one electric circuit to another, without changing the frequency. The energy transfer usually takes place with a change of voltage and current. Transformer Notes PDF and Study Material Free Download TRANSFORMER. PART 1 OBJECTIVES 1. Define the operation and principles of single phase transformer 2. Define the different types and classifications of transformer 3. Solve problems related to the topic TRANSFORMER Device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage. Transformer Consulting Services Inc. Manufacturing Process: Factory tests cont. Test Standard Section Engineering Instruction Dissipation Std EMT200.012.6 & ANSI 10.9 Core Megger Std CSA & EMT 200.012.1 CT Resistance St