Between the high voltage and ground terminal there is either air or a material of high resistance. The function of these instrument transformers is to transfer voltages or currents in the power lines to values which are convenient for the operation of measuring instruments and relays. Thus electricity gets generated and is then later transmitted wherever required. The choice of a particular arrangement depends upon various factors such as system voltage, position of sub-station, degree of reliability, cost etc.
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It is also sometimes referred as transmission transformer. his comment is here are several types of insulators (e. This rotating magnetic flux gets liked with the stator winding and emf gets induced in the stator winding. Suppose a potential transformer rated at 66kV/110V is connected to a power line. Learn moreThe electromagnetism lecture notes is a book to provide an introduction to. .
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A generator consists of basically two important parts called as a stator and a rotor. ) and their use in the sub-station will depend upon the service requirementIn large capacity installations short circuit currents can attain such high values that unless certain means are used to limit them it becomes very difficult for the electrical equipment installed to withstand such high current levels. . A power transformer is used in a sub-station to step-up or step-down the voltage. The secondary consists of a large number of turns of fine wire and provides current for the measuring instruments and relays a current which is a constant fraction of the current in the line.
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For this purpose auxiliary inductive devices called as reactors are introduced in each phase of the given installation. The stator consists of stator core on which a 3-ph electrical winding is wound. If a transmission line has a load with poor power factor, reactors would be connected at the receiving end to correct the power factor. Since the towers are at ground potential. An isolator however cannot be used to open a circuit under normal conditions. It is basically a type of automatic switch when the relay detects a fault condition it sets the circuit breaker into action and the circuit breaker has to break the circuit within minimum time, in order to quickly eliminate the source of fault.
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The rotor is rotated through a shaft by a prime mover (like for e. The secondary winding consists of a few turns and it provides voltage for measuring instruments and relays a voltage which is a known fraction of the line voltage. . It is used to step-down the voltage from values like 132 kV or 220 kV to voltage levels like 11 kV, 22kV or 33 kV. Sign up for free if you are not a member already.
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Overhead line insulators are used to electrically separate the line conductors from each other and from supporting structures. Steam turbine). Com 2021
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Are check that a member? Login nowElectrical equipment used in any substation depends upon the following factors:However, in general, any typical sub-station has the following main equipment A typical layout of an electrical substation is shown below with the help of single line diagram:An electrical generator is one of the most important equipment. g. . .
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. In other words, the apparent power is the vector sum of the active. The overhead transmission lines and Bus-bars are supported on towers. Forgot email?Not your computer? Use a private browsing window to sign in. The most commonly used material for the manufacture of insulators is glass and porcelain. It generates electricity by converting mechanical energy of the prime mover into electrical form.
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Suppose a current transformer rated at 100/5 A is connected in the line to measure current. A step down transformer steps down the voltage or decreases the voltage. If the current in the line is 100 A, then current in the secondary will be 5A. .