Basics, maintenance, and diagnostics vii contents continued page 4. Sp0504 power transformer testing swp pdf file, 110. Case study on pre commissioning of power transformer. Check nameplate ratings and hv, lv terminal markings. These can be of electromagnetic of capacitive voltage transformer type cvt. Transport, installation and commissioning of power. It is carried out as a type test as well as routine test. To affect the safe and orderly handover of the power. Commissioning test for power transformer biology essay. Before proceding with transformer measurements the test engineer will become familiar with the safety rules of section 2. Phase angle check shall be done for correct direction.
Before commencement of any test make sure the surroundings near clear off from any. There are a multitude of checks and tests performed as a transformer is being assembled at a substation. Power transformer pre commisioning checklist transformer. Before and during the analysis process, save data intelligently, naming files in a coherent way. This method statement will give a brief steps to be carried out for testing and pre commissioning of. Lessons learned from commissioning protective relaying. After, installation of power transformer, several precommissioning tests to be done before putting the transformer in service. Voltage transformer testing job safety analysis sp0508c03. As an industry, we have replaced detailed drawings with electronic settings files.
The transformer has been built to standard damage has not been sustained during transit or installation. 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 and inconvenience to. Mr lee wai meng shares some of his experience in the protection of transformers, through a case study. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. Document findings, proposed solutions, and test results. This amounts to a rigorous examination of the transformer intended to. The test set outputs an excitation test voltage to the transformers primary windings and measures the voltage at the corresponding secondary winding. There are various test required on transformer to conform performance of transformer. The precommissioning tests need to be carefully programmed so that they take place in a logical and efficient order, in order that no equipment is disturbed again during subsequent tests. Before commissioning of the transformer at site, the same sfrafra test will have to be carried by the test engineers of the manufacturer in presence of customers representative for comparing the results to take the decisions of the commissioning.
Transformer test ing allows this aging process to be quantified and tracked, to help predict replacement intervals and avoid failures. Transformer testing commissioning, routine, diagnostic. To compare the test results of all the low voltage tests with the manufacturer of transformer test reports. 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.
We also offer a combination of the measurements on the transformer with a dynamic resistance measurement on the onload tapchanger. The test engineer may not directly perform all of the following tests and inspections but must be sure they are satisfactorily completed, so that the final decision over transformer bank readiness for energization can be made schematic diagram for test equipment setup on a power. 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. The secondary coil, which receives energy from the primary winding and delivers it to the load. Transformer precommissioning tests and afterreceipt checks you. Along with different precommissioning tests, different instruments associated to the transformer also to be checked. Lessons learned from commissioning protective relaying systems. Uettdrts24a design testing and commissioning procedures. Precommissioning test of transformer at site scribd. Common pre commissioning tests of transformer insulation resistance values of various winding should be checked. Connection on cpc100 will be same as the shown figure. The core, which makes a path for the magnetic flux.
Transformer should be inspected by authorized electrical inspector and get permission to energize the same 2. Ensure variation in secondary volts as the taps are changed and compare the results with manufacturers test report or ratio mentioned on transformer nameplate. Transport, installation and commissioning of power transformers. Schematic diagram for test equipment setup on a power transformer for verification of winding temperature indicators. Insulation resistance and continuity of the winding should be checked by v megger 3. Voltage transformers testing and commissioning guidelines. Ks01tts24a testing and commissioning procedures for field devices and substations design evidence shall show an understanding of testing and commissioning. In the past, detailed control schematics served as a visual description of.
Of course, for commissioning the transformer, we install the complete range of accessories, such as maintenancefree dehydrating breathers, voltage. Transformer precommissioning tests and afterreceipt. Selected compressed air system steam condensate system hot water heating system computer room hvac system chemical water treatment system chillers cooling towers air terminal unit systems, vav, piu, ahu, etc. Precommissioning tests and functionality assessment of a bulk. Check that all parts of the transformer are properly assembled and tight. Commissioning a test for a differential protection scheme. All transformers are subjected to the following pre commissioning. Home technical articles transformer precommissioning tests and afterreceipt checks you must perform healthiness of the transformer once oil filling is completed, various pre. Testing and commissioning home services testing and commissioning testing and commissioning is the last point in the past when a project is a fact and all of the equipment is subjected to preenergizing field tests in accordance with the procedures, the electrical devices are put into operation and the system is put into operation. Before starting the tests, it is essential to ensure that the assembly of the particular item being tested has been completed and checked. Distribution commissioning test sheet non mps distribution transformer hpc4dl0700212014 this commissioning test sheet covers the checking, testing and commissioning of all replacement or new installations of nonmodular package substation nonmps groundmounted transformers up to 1,000 kva before energisation. These considerations are more easily managed at the place of transformer manufacture, where activities are undertaken in a controlled environment and tho. Power transformer through fault test morteza talebi, power grid engineering yigitcan undug, electric power systems. Before commencement of any test make sure the surroundings near clear off from any unwanted materials etc, and make proper approach, scaffolding etc.
Apply the formula or plot the values in the graph to get the vector group. Power transformer testing and commissioning guidelinesoil. Do not develop and test standard schemes in the lab. The wires have 20 a sockets on the end which is connected to the test switch. Commissioning a test for a differential protection scheme for a threewinding transformer figure 1. Inspect transformer and parts for shipping damage and moisture. 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. What are the commissioning tests of a circuit breaker. Apply 3 phase supply voltage 415 v ac across the primary termination of the transformer. By comparing test data taken after the fault to previous test data, damage to the transformer can be determined.
The test engineer may not directly perform all of the following tests and inspections but must be sure they are satisfactorily completed, so that the final decision over transformer bank readiness for energization can be made. Prior to performing the throughfault test, it is important that all safety procedures regarding the switching, locking, and tagging be observed and. Voltage transformer testing competency assessment sp0508c06. It has been developed with the assistance of bureau of reclamation engineers. Pre commissioning checks on power transformers a thorough check on the transformer is to be made systematically before commissioning the transformer. General inspection mechanical checks general visual inspection and compliance with the drawings and manuals. The commissioning and maintenance personnel must be well experienced in using protection equipment, test equipment, protection functions and the configured functional logics in the ied. Commissioning procedure of power transformer in transformer testing it can be classified into power and distribution transformers. Transformer is the most important equipment in the electrical power transmission and distribution system. Transformer testing type tests and routine tests of. This practical commissioning test was developed decades ago and the authors are simply presenting the theory and procedure of how the test performs in the substation.
Tm 5686 power transformer maintenance and acceptance. The pre commissioning tests performed are insulation resistance test, transformer ratio test, dc winding resistance test and temperature rise test oil and winding temperature. After installation of a circuit breaker some tests are performed before taken in service. Commissioning a test for a differential protection scheme for.
Power transformer testing and commissioning guidelines r. Cvt diagnostic testing reference cvt test equipment specific document sp0506. Transportation, erection, testing and commissioning ieema. Some transformer tests are also carried out at the consumer site before commissioning and also periodically in regular and emergency basis throughout its service life. This method statement will give a brief steps to be carried out for testing and pre commissioning of transformers. Historical test data is valuable for determinll damage to the transformer after a fault or failure has occurred elsewhere in the circuit. Record serial number, rating and making of all components of the transformer such as bushings, tap. Of course, all test results are documented correspondingly. Measure the voltage at the both primary and secondary termination at all the phases. A primary part of commissioning a transformer involves testing it after its installation in the field. Testing and commissioning home services testing and commissioning testing and commissioning is the last point in the past when a project is a fact and all of the equipment is subjected to pre energizing field tests in accordance with the procedures, the electrical devices are put into operation and the system is put into operation. Along with different pre commissioning tests, different instruments associated to the transformer also to be checked. Ir values a for 3311 kv power transformer 2500 v megger is to be need.
Pre commissioning of power transformer engineering essay. Scribd is the worlds largest social reading and publishing site. Feb 08, 2015 the test performed before commissioning the transformer at site is called pre commissioning test of transformer. Tm 5686 power transformer maintenance and acceptance testing. In addition some other tests are also carried out by the consumer at site before commissioning and also periodically. 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. Record all particulars such as ratings, serial number, capacity, voltage ratio etc. Potential voltage transformers testing and precommissioning check potential voltage transformers can be broadly divided in to two type. Routine tests and type tests of transformers electrical4u.
Transformer winding resistance measurement is carried out to calculate the i 2 r losses and to calculate winding temperature at the end of a temperature rise test. The commissioning personnel must have a basic knowledge of handling electronic equipment. It is also done at site to ensure healthiness of a transformer that is to check loose connections, broken strands of conductor, high contact resistance in tap changers, high. Power transformer through fault test morteza talebi, power grid engineering. Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test. Transformer testing type tests and routine tests of transformer. The voltage ratio is displayed and compared with the expected target ratio. Insulation resistance values of various winding should be checked. The transformer the principle parts of a transformer and their functions are. Testing and commissioning instrumenttransformers free download as powerpoint presentation.
May 10, 20 transformer manufacturers perform two main types of transformer testing type test of transformer and routine test of transformer. Precommissioning test of transformer at site free download as pdf file. Carry out all precommissioning test and final commissioning check as. Precommissioning tests and functionality assessment of a bulk power transformer. Commissioning of distribution transformer before actually charging the transformer the following points should be checked. After, installation of power transformer, several pre commissioning tests to be done before putting the transformer in service. Repeat the test for the other phases and the other secondary cores. Th e transformer is one of the most important items of hardware in the electrical power system.