File Name: power transformer testing and commissioning .zip
Transformer testing is an indispensable procedure to guarantee that transformers are fulfilling all requirements and guaranteed values.
Transformer testing is done for confirming the specifications and performance of an electrical power transformer. The transformer is the main part of an electrical distribution system so if it is not working properly then it will affect the distribution system. So it has to go through numerous testing procedures. Some tests are done at the manufacturing location before delivering it to the customer. The need for transformer testing is to check the functioning of the transformer and to decrease the chance of failure.
All electrical equipment needs to be maintained safely from some of the failures. Transformer failure can happen because of electrical, thermal, or mechanical factors.
Insulation breakdown will also cause transformer failure. Electrical induced failures in transformers are overvoltage conditions, lightning, and switching surges, partial discharges, and static electrification. Winding deformation in transformers can happen in either during shipping or during magnetically induced electromechanical forces.
Thermal induced failures in transformers are caused by the paper insulation of the windings to lose its physical strength to the point where it can no longer withstand the mechanical movement that occurs inside a transformer. Thermally-induced failure is due to the overloading beyond its design capability for a long period of time.
A routine test in the transformer is done to confirm the operational performance of an individual unit in a production lot. In this test, there will be a winding measurement test in which the HV and LV winding resistance will be measured. It also does the separate source voltage withstand test and this test checks the insulation property between primary to earth, secondary to earth, and between primary and secondary.
It also does the overvoltage withstand the test. The voltage ratio will be measured in this test the voltage ratio is equal to the turns ratio in a transformer. Measurement of load loss and impedance in this test measures the power consumed by the transformer when the V winding is short-circuited and the rated current is passed through the 11Kv winding.
It also does the dielectric and polarity test. A special test is done as per the customer requirement to obtain information useful to the user during the operation or maintenance of the transformer.
In this test, it does tests like dielectric and short circuit test, measurement of zero sequence impedance of three-phase transformers, measurement of acoustic noise level, measurement of harmonics of no-load current, and it also measures the power taken by the fans and oil pumps. The testing of the transformer before commissioning the transformer at the site is called the pre-commissioning test.
These tests are done to check the transformer condition after installation and compare the result with the factory test. Type test includes measurement of winding resistance, measurement of voltage ratio, polarity and dielectric test, measurement of load loss and short circuit impedance, measurement of insulation and temperature rise test. A transformer is the major part of any power system, so preventive maintenance is coast effective and time-saving.
If any failure happens in the transformer then it will affect the whole system. Maintenance can be done by oil level checking by checking the acidity and leakage of the oil. Dust, dirt, and sludge can be removed by filtration. Periodic dissolved gas analysis can be carried out. The bushing should be cleaned and inspected for any cracks.
Periodic checking of any loose connections of the terminations of HV and LV side. Home Forum Tool Contact Us. Facebook Twitter Youtube. Primary Menu AutomationForum. Search for: Search. Home Electrical Why transformer testing is needed and how to do the maintenance of a transformer. What is a piezoelectric transducer and how does it work.
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April 11th, , Published in Articles: Energize. Power transformers have to go through a series of tests after manufacture to confirm that specifications and performance requirements have been met. A full set of tests are done at the manufacturer premises before delivery. In addition some of these tests are repeated at the installation site before commissioning and there is an increasing trend to carry out high voltage tests on site in addition to the basic tests. Electrical tests on power transformers are grouped in type and routine tests. The goal of a type test is to confirm correct design while the goal of a routine test is to check correct manufacture or condition of the transformer.
Abstract- After new power transformer has been set up on site and before it connects with power supply and loading the load, it is must to have to go through numbers of testing procedures for confirming the specifications and performances of a power transformer. The purpose of commissioning tests on transformer is to satisfy, to pre-determined standards, that all the equipment erection is correct and that all the equipment connections or cables have been installed in accordance with the approved erection drawings and diagrams. This paper describes about some testing before commissioning of power transformer at site Penang Port Sdn. Nowadays, power transformer is most important equipment in electrical power transmission and power distribution system. Commissioning test for power transformer should to be done to verify the technical suitability for the application and check the healthiness or condition of power transformer before energizing by connecting to the power supply system and loading the load. For confirming that power transformer is follow the specification and performances according customer needs based on the specification set by manufacturer of power transformer, some of testing procedures should to be done.
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