A handbook on operation and maintenance of transformer. We also offer solutions for testing bushingtype current. Potential voltage transformers testing and precommissioning check potential voltage transformers can be broadly divided in to two type. Once you have completed the testing, you can also demagnetize the transformer. Maintenance testing commission testing data is baseline for the lifecycle maintenance date of commissioning records define time 0 for prc005 current and voltage measuring device insulation failure detected battery and charger performance degradation observed communication channel degradation flagged. Before commencement of any test make sure the surroundings near clear off from any. Transformer testing commissioning, routine, diagnostic.
Basics, maintenance, and diagnostics xi contents continued page 9. Transformer testing has developed considerably over the past years. Inspection, testing and commissioning of electrical. In addition some other tests are also carried out by the consumer at site before commissioning and also. Technical specification for startup and commissioning of new products specification number. This page gives full list of electrical method statements which you can download as per your requirements. All of these factors affect the amount of testing necessary to certify that a transformer is ready to be energized and placed in service. The transformer testing performed before commissioning the transformer at the site is called the precommissioning test of transformer. In order to ensure availability of uninterrupted power supply, it is essential that the condition of transformer is continuously monitored during service as failure of transformer would result in interruption of power supply resulting loss of industrial production. The commissioning personnel must have a basic knowledge of handling electronic equipment. Latest diagnostic testing techniques for assessing the condition of substation equipment such as transformers, circuit breakers, load tap changers, switches, and associated equipment application of predictive diagnostic testing to reduce equipment failures and extend equipment life.
Voltage transformer testing competency assessment sp0508c06. The purpose of this swp is to standardise and prescribe the method for testing current transformers used for substation protection and indication systems. In this post, i will discuss the indoor transformer installation, inspection, and commissioning transformer indoor installation. As you already know, substations are the points for controlling the supply of power on different routes by means of various equipment such as power transformers, circuit breakers, ctsvts, compensating equipment, isolators, etc. Power transformer testing brochure omicron mafiadoc. Power transformer testing and commissioning guidelinesoil. Transport, installation and commissioning of power. Transformer precommissioning tests and afterreceipt. Transformer, throughfault, substation, commission and testing. The commissioning and maintenance personnel must be well experienced in using protection equipment, test equipment, protection. Diagnostic testing and monitoring will help you to determine your assets condition and choose the right corrective measures to ensure reliable operation and extend the transformers life expectancy. Download electrical method statements method statement hq. However, this is not to say that this book is useless to students the easy to read question and testing and commissioning of electrical equipments by s rao format serves as a guiding light to those who wish to attempt higher level competitive exams and need to brush up on the basics because they are otherwise too bogged. Do not believe, until it is proven is the key to successful.
Transformer installation, inspection and commissioning. Based on the microprocessor protective relays manual. Common precommissioning tests of transformer insulation resistance values of various winding should be. Before do the testing, the testers must be following the guideline to avoid the most accident because testing work on transformer need to be done carefully and cautiously. Commissioning process for new substation equipmenthayes. Sp0504 power transformer testing swp pdf file, 110. The transformer is usually pressurised to 20 kpa and a gas bottle. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. This method statement will give a brief steps to be carried out for testing and pre commissioning of transformers. Introduction substation commissioning and testing is a critical task prior to substation energization to ensure all equipment will function safely in the intended manner. Each electrical method statement folder contains editable files like. Home technical articles transformer precommissioning tests and afterreceipt checks you must perform healthiness of the transformer once oil filling is completed, various pre.
Commissioning procedure of power transformer in transformer testing it can be classified into power and distribution transformers. This gl o macs startup, commissioning and testing of electrical systems training seminar has been designed to provide a clear and perfect understanding of principles of commissioning and electrical installation equipment readiness for a commercial service is proven by testing all its functions under different conditions. For more discussion on these tests, see pressure tests chapter 4. In this book we have laid down important aspects on transformer. Voltage transformers testing and commissioning guidelines. The parts mentioned on the drawing are to be checked for physical mounting.
Prior to dispatch, the transformer should be checked for leaks by a combination of pressure and vacuum leak rate tests. Testing of power transformers seems like a similar experience. To ensure that the product is fit for its intended use standards iec standards iec 60076 part 1 part 14. Transformer will be moved over rails and brought to the position as indicated in the drawing, after installation of wheels at base. A primary part of commissioning a transformer involves testing it after its installation in the field. Transportation, erection, testing and commissioning ieema. When ac hipot tests are used for routine maintenance, the power transformer can be examined at rated voltage for 3 min instead of testing at 65% of factory test voltage. The objective of testing is to ensure quality to ensure that the products manufactured have met the requirements of customer specificationstandard to prevent accidents which may occur if a failed product is put into service. Method statement for installation of transformers safe. Along with different precommissioning tests, different instruments associated to the transformer also to be checked.
Commissioning test for power transformer biology essay. Negative influences on a transformers life expectancy thermal influences overload, overheating, ambient conditions aging moisture, acids. Neta is not only for commissioning new equipment but for testing the reliability and performance of existing equipment. The ac hv test value should not surpass 75% of the factory test value. This manual addresses the personnel responsible for commissioning, maintenance and taking the ied in and out of normal service. After, installation of power transformer, several precommissioning tests to be done before putting the transformer in service. Precommissioning tests and functionality assessment of a bulk. Check the following points before start the transformer testing and commissioning. Transformer precommissioning tests and afterreceipt checks you. Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test.
Before starting transformer testing some of the percommissioning checks a physical inspection of the transformer is to be carried out along with the general arrangement drawing. There are various test required on transformer to conform performance of transformer. Home technical articles transformer pre commissioning tests and afterreceipt checks you must perform healthiness of the transformer once oil filling is completed, various pre. Voltage transformer testing job safety analysis sp0508c03. Transformer will be moved by crane using lifting lugs as per manufacturers, recommendation and shall be positioned on transformer base in plant yard. Sp0507 current transformer testing swp pdf file, 58. Power transformer testing and commissioning guidelines r. With our testing system, you can use a single device to determine all of these parameters in an easy way.
This amounts to a rigorous examination of the transformer intended to. There are a multitude of checks and tests performed as a transformer is being assembled at a substation. Electrical substation design, testing and commissioning. Common electrical tests on power transformers omicron. Technical specification for startup and commissioning of. Pre commissioning of power transformer engineering essay.
These can be of electromagnetic of capacitive voltage transformer type cvt. There is some specification if you want to install a power transformer inside a room. The pre commissioning test result should to compare with manufacture test result basically on transformer name plate or manual guideline and international standard ieee standard or interplant standardsteel industry, code of practice for testing and commissioning of power transformer and related switchgears, ipss. These tests are done to assess the condition of transformer after installation and compare the test results of all the low voltage tests with the factory test reports. Figure 2 showed the flow chart when doing the testing on precommissioning of power transformer. Common precommissioning tests of transformer insulation resistance. Technical specification for startup and commissioning of new.
Sp0507r01 current transformer testing jsa pdf file, 34. It rating plate show nominal voltage, current of primary and secondary voltage at various of the tap changer, connection symbols vector group, % impedance weight of oil etc. Transformer is the most important equipment in the electrical power transmission and distribution system. Testing and commissioning of hv power transformers. Substation commissioning and testing is a critical task prior to substation energization to. We offer both preventative maintenance transformer testing and transformer commissioning, vacuum breaker, magnetic breaker, air blast breakers, sf6 breaker, regulators, metal clad switchgear, relays, cables, bus, if it carries current there is a. Medium and large power transformers in distribution or transmission power system are often. Cvt diagnostic testing reference cvt test equipment specific document sp0506.
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