Testing of power transformers and shunt reactors pdf

The shunt reactor compensates the capacitive generation on power lines to avoid noncontrolled voltage rise especially on lightly loaded lines. Series reactors are sometimes referred to as current limiting reactors and, as the name suggests, are used for the purpose of limiting fault currents or restricting the fault levels of power station auxiliary systems. Iwanusiw, consultant eltel industries, bangalore, india resume this paper discusses. Reactor products abb oy transformers has extensive experience. Design of 25 mva shunt reactor for 230 kv transmission line. Power transformer testing measuring capacitance and. Oltc tap position indicated on the transformer reactor during the test. Shunt reactor and transformer both appear similar in construction. The condition of the bushings and the overall insulation of power transformers can be investigated by measuring the capacitance and dissipation factor, also. Hence, operability of the entire power system and the stable supply to consumers with qual. Requirements, terminology, and test code for shunt reactors rated over 500 kva ie 62032 ieee 57. It has been written for transformer designers, test field engineers, inspectors, consultants,academics and. Current limiting reactors an overview sciencedirect topics.

Induction voltage regulators were used to control voltage of electrical network in earlier days, but they are now replaced by tap changing transformers. It is the most compact device commonly used for reactive power compensation in long high voltage transmission lines and in cable systems. Vibration measurement, withstand voltage, type testing, electric power systems, shunt reactors, impulse. The shunt reactor bank shall comply with the following technical requirements. Application fields and control principles of variable shunt. Most of ges transformers and reactors have long surpassed their life. Designing a sensitive and reliable algorithm for turn to turn fault detection in shunt reactors still remains a challenge. Due to their inductive nature of the shunt reactor, it is used whenever there is need for compensation of capacitive reactance. A shunt reactor energization produces a decayed direct current in the network leading to phenomena which some of them are currently highinterest topics in the power system study. Long underground power lines where is capacitive load electronic energy saving lamps and ballast computer centrums and big ups systems used for rated capacitors q. Transformer and reactor bushings 5 reliability and security of the processes of electric energy generation, transmission and distribution to the end consumer depends upon quality of special power equipment, such as highvoltage bushings. Reactors are also often equipped with fans for cooling similar to power transformers.

In this paper, a novel hybrid differential algorithm has been proposed to detect turn to turn faults in shunt reactors. Power transformer testing measuring capacitance and power. Test lab reactors are installed in highvoltage and high power test laboratories. By combining low life cycle cost and high efficiency, abb reactors will boost customers bottom line. Ieee standard requirements, terminology, and test code for shunt reactors rated over 500 kva, b arc suppression. While a power transformer is designed for efficient power transfer. Diagnostic tests and measurements that are performed in the field on fluidfilled power transformers and regulators are described. Shunt reactors are mainly used to keep the voltage down, by absorbing the reactive power, in the case of light load and load rejection, and to compensate the capacitive load of the transmission line for reactive power balance.

These tests require a very high capacitive reactive power up to 200400 mvar. Application fields and control principles of shunt reactors with tapchanger investigation of possible control strategies of variable shunt reactors through simulation of a power system under different operating conditions mohammad khorami department of energy and environment division of electric power engineering chalmers university of technology. The tests are presented systematically in categories depending on the subsystem of the unit being examined. Iec6007618 sfra of power transformers, typical test. Mar 10, 2020 as per is 5553 the tests performed on an ehv or uhv shunt reactor can be categorized in three different groups. Reactive compensation for testing shunt reactors and large power transformers. Shunt reactors can be treated as a star wound transformer, with three measurements without taps and six measurements with taps.

Abbs reactors increase the energy efficiency by improving power quality and reducing costs. This is an unapproved ieee standards draft, subject to change. Comprehensive overcurrent protectionapply individual winding phase, residual, and negativesequence. Shunt reactors shunt reactors are a vital part of the ef. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. Twowinding differential protectionprovide current differential protection with programmable single or dualslope percentage restraint for twowinding transformers, reactors, generators, large motors, and other twoterminal apparatus. Abb testing of power transformers and shunt reactors pdf fri. Shunt reactors are rated in mvar whilst power transformers are. This guide describes diagnostic field tests and measurements that are performed on fluidfilled power transformers and regulators. Ge grid solutions aircore reactors dry type ge has more than 50 years of experience in designing and manufacturing aircore reactors acr for various market segments globally, including power generation, transmission and. It does this by compensating for the capacitive charging of the high voltage aclines and cables, which are the primary generators of reactive power. Power transformers and shunt reactors proven history for future success.

W ithin hydroquebec, shunt reactors are norm ally used on 800 kv system s directly connected and the m argin between the protective level of the surge arrester and the s iw l of the reactor is m uch low er than for lower system voltages. Ieee guide for diagnostic field testing of fluidfilled power. Test lab reactors are installed in highvoltage and highpower test laboratories. This reactor normally connected in parallel in the system. Externally fused and fuseless capacitor bank testing ieee std. In this book we have laid down important aspects on transformer. The proven design and robust buildup makes the shunt reactor the. Shunt reactors are inductive device commonly used in hv and ehv systems for compensating the excess capacitive vars in a power system. Routine tests for power transformers, shunt reactors and bushings acceptance tests on surge arresters. The impulse voltage test systems are applied to test the ability of power grid equipment to withstand transient voltage peaks, such as those resulting from lightning strokes or switching. Shunt reactor is same as power transformer but it has only one winding per phase as compared to power transformer. All bsi british standards available online in electronic and print formats.

Shunt reactors hico america power transformer, gis, gcb. Shunt these reactors are used in a parallel configuration to compensate for the. Abb testing of power transformers and shunt reactors pdf. Presentation made during the ieee transformers committee. In its state of theart factory in changwon, korea, with a production capacity of approximately 100,000mva per year, hyosung manufactures both power transformers and shunt reactors. The quality of a transformer is of utmost importance for safety, industrial and financial reasons. Temperaturerise tests on transformers and shunt reactors, test on onload tap changers oltc on transformers and shunt reactors, determination of reactance and linearity of reactance on shunt reactors, inducedvoltage tests on shunt reactors.

However, there are major differences between the two. Preface this is the fifth edition of csa c88, power transformers and reactors. A diagnostic chart is included as an aid to identify the various subsystems. Cancsa c88m1990 r2014 cancsac88m90 r2014 power transformers and reactors. Reaffirmed 2005 diagnostic tests and measurements that are performed in the field on oilimmersed power transformers and regulators are described. Being a component of power transformers and shunt reactors, the bushings are the most. Shunt reactors are inductive loads similar to transformers but they are different than transformers in terms of. Shunt reactors reactors and inductors transformers a shunt reactor is an absorber of reactive power, thus increasing the energy efficiency of the system.

The capacitor bank was installed and energized during 2008. The abb shunt reactor is the most cost efficient piece of equipment for maintaining voltage stability on the transmission lines. Jun 29, 2017 shunt reactors reactors and inductors transformers a shunt reactor is an absorber of reactive power, thus increasing the energy efficiency of the system. Insulation power factor testing of power transformers oleh w. Normal purpose of shunt reactor is to compensate the capacitive component of current in the system. Type tests of shunt reactor the following tests are essentially performed on a shunt reactor as type. The book represented the collective wisdom of over 100 years of testing power transformers. Differences between shunt reactor and power transformer. Highvoltage capacitive compensation unit for transformer.

Power shunt reactors are critical elements in electric power systems for. This document presents the updated lists of active working groups wg in each of the 16 study committees sc. As per is 5553 the tests performed on an ehv or uhv shunt reactor can be categorized in three different groups. The reason for limiting fault levels is to ensure that the system will remain within the.

Type tests of shunt reactor the following tests are essentially performed on a shunt reactor as type tests measurement of winding resistance. Voltage control by using shunt reactors shunt reactors are basically inductive elements that are provided at sending end and receiving end of long ehv and uhv transmission lines. In electrical systems and equipment third edition, 1992. Insulation levels, dielectric tests and external clearances in air ieee c57. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Reactor has many roles to play in electrical power system. Ge has a long track record of power transformers of different designs that have successfully gone through shortcircuit testing. The reactors are normally classified according to their modes of applications. Study on shunt reactor energization effects on power transformers. The ultrahighvoltage test hall is capable of carrying out the final electrical testing of power transformers and reactors including routine tests and also type tests and special tests. Jun 28, 2012 the condition of the bushings and the overall insulation of power transformers can be investigated by measuring the capacitance and dissipation factor, also. Being a component of power transformers and shunt reactors, the bushings are the most important connecting element in power plant power line transformer substation loop. Guide for field pd tests for liquidfilled power transformers. Mar 21, 20 serving many customers from all over the world has given us a deep understanding of the varying customer requirements and operating conditions that characterize transformer and shunt reactor projects.

Supply by abb hv components customer need abb power transformers manufactures. Ieee std 621995 revision of ieee std 621978 ieee guide. This transformer protection ied is designed to operate correctly over a wide frequency range in order to accommodate power system frequency variations during disturbances and generator start up and shut down. This guide describes diagnostic field tests and measurements that are performed on liquidfilled power transformers and regulators. Tests are presented systematically in categories depending on the subsystem of the unit being examined. International customers count on trenchs experience when equipping high voltage test laboratories with reactors. It has very low requirements on the main cts, and no interposing cts are required. Iec6007618 sfra of power transformers, typical test sequences. While a power transformer is designed for efficient power transfer from one voltage system to another, a shunt reactor is intended only to. The test hall capacitor bank is in regular operation, doing its job of generating reactive power for testing of larger shunt reactors and power transformers. Ieee guide for diagnostic field testing of electric power.

In 2003, abb compiled all its knowledge in a book titled testing of power transformers. C88 applies to liquidfilled power transformers, autotransformers, booster transformers, loadtapchanging transformers, grounding transformers, phaseshifting transformers, seriesvoltage regulators, and shunt reactors. Testing of power transformers seems like a similar experience. The bank for testing of shunt reactors was put in operation well ahead of schedule. A novel method for turntoturn fault detection in shunt. Checking power capacitor banks for failed capacitors. For isolation testing, various methods are available on the market. Transformer testing has developed considerably over the past years. Power transformers and shunt reactors proven history for. Abb power transformers ludvika, sweden reactive compensation for testing shunt reactors and large power transformers. Abb builds today a wide portfolio of reactors with drytype and liquidfilled technology for both ac and dc voltages. Oil filled power transformers, regulators, and reactors 1. Shunt reactors may be designed without air or iron core to prevent the hysteresis loss as there are large amount of magnetizing current as compared to power transformers. It supersedes the previous editions published in 1991, 1979, 1968, and 1947.