Pdf design and construction of constant voltage transformer. The voltage transformer can be thought of as an electrical component rather than an electronic component. Analysis and design of a threephase constant voltage transformer. The operating principle is based on the saturation of 5 cores out of 6 at any given instant in time. Capacitive voltage transformer, equivalent circuit l z b f c f r f 100 v 3 20 kv 3. What is a constant voltage transformer cvt an introduction to the perfect sine wave outstanding spike and electrical noise protection. The main disadvantage to a constantvoltage transformer is efficiency and regulation for frequency and load. Kod ktf remanence only considered in extra high voltage systems ehv k tfvalues acc. Since the transformer core is always operated under saturation, this is an inherently inefficient design. Constant voltage sinusoidal transformers operating and.
This operating and service manual has been prepared to ensure that your. An alternating voltage v p applied to the primary creates an alternating current i p through the primary. What is a constant voltage transformer an introduction to the. In other words, transformers do not operate on steady state dc voltages. What is a constant voltage transformer an introduction. With the popularisation of pcs, the constant voltage transformers cvts have also become equally popular. Instrument transformer theory and testing steve hudson, pe. Design and construction of a 10kva, 220volts constant voltage. The consequence is that the secondary part of the transformer runs saturated and the.
Capability for handling a short circuit is an inherent feature of a constant voltage transformer. Pdf transformer basics a typical voltage transformer andreas. The other winding carries a nearly constant voltage, determined. The cvt is simply a magnetic transformer of a special construction that has a capacitor connected across the secondary winding of the transformer. The regulation of a constant voltage transformer can be designed to be better than a few percent. A transformer basically is very simple static or stationary electromagnetic passive electrical device that works on the principle of faradays law of induction by converting electrical energy from one value to another. Figure 1 represents the essential elements for a transformer a magnetic core, with a primary and secondary coil wound on the limbs of the magnetic core. Cvtconstant voltage transformerworking, circuit diagram. Pdf this paper presents the design and construction of constant voltage transformer by means of conventional power transformer core structures. We can verify that the ratio is correct and constant as burden changes. This lc circuit is tuned to resonate at the desired transformer frequency. This paper presents the design and construction of constant voltage transformer by means of conventional power transformer core structures.
A potential transformer is a conventional transformer having primary and secondary windings. The very best power protection comes from a special type of transformer known as a constant voltage transformer cvt. The core operated at a high temperature of around 45 to 85 0 c above the ambient owing to the power dissipated in the core. The constant voltage transformer is suitable for use to. Sola heviduty constant voltage transformer can be operated and serviced. If the constant voltage transformer is subjected to a line voltage frequency change the output voltage will vary, as shown in figure 115. Ferroresonant transformer schematic the cvt ferro uses the unique principle of ferroresonance. Transformer basics transformers are electrical devices consisting of two or more.
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