Precommissioning test of transformer at site free download as pdf file. Before commencement of any test make sure the surroundings near clear off from any unwanted materials etc, and make proper approach. Power transformer pre commisioning checklist transformer. Type test procedure iec, nec, nema, fdf, iso ansi, ci, ipcea iec, nec, nema, fdf, iso ansi, ci, ipcea procedure h r a inspection and test plan for power transformer before manufacturing activity by. This test is not required for factorysealed circuit switcher interrupters. 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. Case study on pre commissioning of power transformer.
The commissioning authority is the leader of the team. Transformer precommissioning tests and afterreceipt checks you. Once precommissioning is complete, check output voltage, deenergises and earth transformer, and adjust if required. 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. This material is made available on the basis that it may be necessary for a registered professional engineer of queensland rpeq to undertake or oversee the engineering services to meet statutory obligations. Precommissioning tests and functionality assessment of a bulk. The commissioning personnel must have a basic knowledge of handling electronic equipment. Testing of power transformers seems like a similar experience. Voltage transformers testing and commissioning guidelines. Pre commissioning of power transformer engineering essay.
Insulation resistance values of various winding should be checked. Record serial number, rating and making of all components of the transformer such as bushings, tap. Inspection, testing and commissioning of electrical. Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test. Tm 5686 power transformer maintenance and acceptance. Th e transformer is one of the most important items of hardware in the electrical power system. 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. List of prequalified manufacturerssuppliers for main. Mr lee wai meng shares some of his experience in the protection of transformers, through a case study.
Introduction the procedures stated in this document cover the activities in preliminary tests and inspections, functional performance tests and the commissioning of newly completed installations and existing ones after major alteration. Record all particulars such as ratings, serial number, capacity, voltage ratio etc. Testing and commissioning of hv power transformers. Along with different precommissioning tests, different instruments associated to the transformer also to be checked. Transformer bushing cts should be tested using the current ratio test method before the transformer has been completely assembled.
Power transformer testing and commissioning guidelines r. The tap changer must only be operated while the transformer is deenergised. Ir values a for 3311 kv power transformer 2500 v megger is to be need. Precommissioning is the physically mechanically finishing of construction work and cold alignment check of each system, unit, and overall area that. The main transformers and main breakers must have a dielectric test performed on the insulating medium gas or oil. 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.
Transformer precommissioning tests and afterreceipt. This amounts to a rigorous examination of the transformer intended to. Power transformer testing and commissioning guidelinesoil. Potential voltage transformers testing and precommissioning check potential voltage transformers can be broadly divided in to two type. Precommissioning tests and functionality assessment of a bulk power transformer. Test voltages and times for vlf covered in ieee std.
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. Sweep frequency response analysis sfra is a method to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range. Information is given on wave shapes, test circuits including test connections, earthing practices, failure detection methods, measuring techniques and interpretation of results. Commissioning procedure by gangga wahyu definition precommissioning works are part of construction works that have to be finished before obtain mechanical completion status.
Transformer pre commissioning tests and afterreceipt checks you. 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 testing commissioning, routine, diagnostic. Various electrical tests must be performed and their significance and short description are given below. There are various test required on transformer to conform performance of transformer.
Free commissioning training join the free online commissioning training now. Sp0504 power transformer testing swp pdf file, 110. Commissioning a test for a differential protection scheme for a threewinding transformer figure 1. Precommissioning tests and inservice checks of protection system photo credit. After, installation of power transformer, several precommissioning tests to be done before putting the transformer in service. 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. Ensure variation in secondary volts as the taps are changed and compare the results with manufacturers test report or ratio mentioned on transformer nameplate. Pre commissioning test of transformer pdf 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 temperature rise test of power transformer is including the pre commissioning test of. These can be of electromagnetic of capacitive voltage transformer type cvt. Because a test confirms what you know, if you can apply in real life what you have learned in a classroom, under strict, rigorous and controlled conditions. Before commencement of any test make sure the surroundings near clear off from any unwanted materials etc, and make proper approach, scaffolding etc. Carry out all precommissioning test and final commissioning check as elaborated in. Precommissioning test of transformer at site scribd.
Transportation, erection, testing and commissioning ieema. Historical test data is valuable for determinll damage to the transformer after a fault or failure has occurred elsewhere in the circuit. Commissioning a test for a differential protection scheme. 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 power transformer, several pre commissioning tests to be done before putting the transformer in service. 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. A primary part of commissioning a transformer involves testing it after its installation in the field. Precommissioning procedures for transmission lines introduction over all procedure, safety rules, statutory requirements, dispatch procedures, switching sequences, observations, passing criteria and documentation of test results have been documented in this report. The table 1 showed the acceptable resistance in ir test. During hot oil circulation, keep fire extinguisher ready near transformer. Testing and commissioning procedure for electrical installation 1. Routine tests and type tests of transformers electrical4u. It has been developed with the assistance of bureau of reclamation engineers. By comparing test data taken after the fault to previous test data, damage to the transformer can be determined.
Along with different pre commissioning tests, different instruments associated to the transformer also to be checked. Sfra is a comparative method, meaning an evaluation of the transformer. Prior to final commissioning and energising of the high voltage equipment, direct lines of communication must be established between the asps nominated person, for site commissioning. Precommissioning and commissioning procedure natural gas. Set the tap changer and insert location pin to lock in desired position, prior to energisation. In addition to these, the transformer also goes through some other tests, performed on it, before actual. 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. 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. After installation and assembly at site, the following precommissioning tests on transformer should be conducted.
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