The electrical tests recommended for commissioning a transformer include. Record serial number, rating and making of all components of the transformer such as bushings, tap. To secure a long lifespan for the transformer it is important to follow proper installation, commissioning and protection procedures and to ensure that timely maintenance is carried out during transformer operation. In this post, i will discuss the indoor transformer installation, inspection, and commissioning transformer indoor installation. Pre commissioning checks on power transformers a thorough check on the transformer is to be made systematically before commissioning the transformer. Technical specification for startup and commissioning of new. Testing and commissioning of hv power transformers, circuit. A transformer which has been commissioned and then. It is aiming primarily at ac transformer platforms but may also be used analogously for acdc converter platforms, accommodation platforms and reactive compensation platforms, where applicable. This rp is applicable for verification and certificatio n of manufacturing, testing and commissioning activities regarding fixed osss for wpp. Common precommissioning tests of transformer insulation resistance values of various winding should be checked. Transformer testing commissioning, routine, diagnostic megger.
To the precommissioning checks required for new primary transformers, each. Specific areas addressed in a commissioning plan include the verification of the. Switchgear testing and commissioning procedure electrical. Precommissioning checks and tests, detailed tests and commissioning procedures and instructions for all electrical. 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. Commissioning process for new substation equipmenthayes. No transformer should have rated service voltage applied to it until all preliminary work and pre commissioning tests and checks have been satisfactorily completed. An expansion of leed by rick miller, pe, leed ap rnm engineering, inc. Verify that current and potential transformer ratios correspond to drawings. Pre commissioning 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 transformer is a static electric device consisting essentially of two or more windings wound on the same core electromagnetic induction transforms electric energy from one circuit to another circuit such that the frequency of the energy remains unchanged while the voltage and current usually change definition of a transformers. Transformer precommissioning tests and afterreceipt checks you. Common precommissioning tests of transformer insulation. Power transformer testing and commissioning guidelines r 1. A stepbystep guide engineering, architecture, construction, environmental and consulting solutions. Inspection, testing and commissioning of electrical. Isolate the power supply to the transformer connect the hv live part of the terminal to the earth by connecting with.
Power transformer testing transformers may be tested using ac or dc voltage. Power transformer pre commisioning checklist transformer. Check whether the transformer under test had been isolated from other electrical equipments and from induction using earth switch or local earthing arrangement. Pre commissioning of power transformer engineering essay. Megger and power factor windings, bushing and arrestors. A transformer must be mounted so that air can freely circulate all around and through it. After, installation of power transformer, several precommissioning tests to be done before putting the transformer in service.
This method statement will give a brief steps to be carried out for testing and pre commissioning of transformers. 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. No high voltage tests should be applied to any transformer without making reference to the original supplier wps. Connect the test set for singlephase current injection to the protection terminals connected to the ct in the power transformer neutraltoearth circuit. A procedure should be developed to include a planned approach or road map of what should be done in order to verify the proper system installation.
A primary part of commissioning a transformer involves testing it after its installation in the field. Testing and commissioning of hv power transformers. You can find below a comprehensive switchgear testing and commissioning procedure. Commissioning procedure the commissioning procedure is the general guideline that each engineer at firstenergy. The power transformer testing performed before actual commissioning test of the transformer at site is called pre commissioning of the power transformer at site like insulation resistance test, transformer turns ratio test, dc winding resistance test, temperature test and oil test2. Before commencement of any test make sure the surroundings near clear off from any. Strip the cable of its insulation to the desired length without ringing or nicking the wire. The commissioning personnel must have a basic knowledge of handling electronic equipment. Therefore at least following tools shall be arranged before starting the electrical testing job.
After, installation of power transformer, several pre commissioning tests to be done before putting the transformer in service. A transformer room must have adequate ventilation and should not be used for storage. Ensure only trained persons shall operate the power tools. There are various test required on transformer to conform. 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 precommissioning tests and afterreceipt checks. Test the insulation resistance ir values using a v megger unit for various sections such as hv to lv, lv to earth, hv to earth. Installation and commissioning manual protectit transformer protection terminal. Transformer ratio test, short circuit current measurement, measurement of magnetizing current, test. Commissioning of distribution transformer before actually charging the transformer the following points should be checked. Routine tests and type tests of transformers electrical4u. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system.
The ratio test between the hv and lv at all tap positions should also be. Pdf precommissioning test of dry type transformer ajay. Precommissioning checks and tests commissioning procedures. Transportation, erection, testing and commissioning ieema. 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. Transformer is the most important equipment in the electrical power transmission and distribution system. Transformers while experiencing severity of short circuit current looses its mechanical property by way of deformation of the winding or core. No transformer should have rated service voltage applied to it until all preliminary work and precommissioning tests and checks have been satisfactorily completed. Nov 17, 2019 after, installation of power transformer, several precommissioning tests to be done before putting the transformer in service. Transformer installation, operation, and maintenance manual. Transformer installation method statement electrical. Insulation resistance and continuity of the winding should be checked by v megger 3. Technical specification for startup and commissioning of new products specification number. I already posted a couple of articles about the power transformer.
Power transformer testing and commissioning guidelinesr sahoo procedure of power transformer testing and commissioning in transformer testing and commissioning, it can be classified into power and distribution transformers. Ensure all concerned personals shall use ppe and all other items as required. 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. Purpose of commissioning, responsibilities, system description. Common pre commissioning tests of transformer insulation resistance values of various winding should be checked. This amounts to a rigorous examination of the transformer intended to. There is some specification if you want to install a power transformer inside a room. But you can do it when you get the permeation from the government. Safety controls installed and safe operating ranges for this equipment provided to the commissioning agent heating water piping and pump prefunctional checklists completed boiler controls energized and safety controls tested startup report includes optimal and actual percent co2,co, o2, stack temperature. Ventilated style do not place combustible materials on or near transformer or mount transformer closer than 6 inches from any adjacent wall. 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.
As part of this project, startup services will be performed on the electrical distribution and control equipment as specified. Technical specification for startup and commissioning of. Precommissioning test of transformer at site scribd. Transformer precommissioning tests and afterreceipt. Record all particulars such as ratings, serial number, capacity, voltage ratio etc.
Installation and commissioning installationerection and commissioning as well as supervision, transport and haul. Transformer is loaded on the trailer with the help of certified mobile crane having lifting chains with locking hook at the end is connected to four comer of the transformer top. Schneider electrics transformer erection and commissioning schneider electric india. Installation and commissioning transformer service abb. As such, in this paper, a detailed procedure of the throughfault test for power transformer differential circuit prior to substation energization using the practical. Thus, effective, regular maintenance and testing is even more essential to.
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. In this post, i will discuss the indoor transformer installation, inspection, and commissioning. Power transformer testing and commissioning guidelinesoil. Whether you are installing a new, repaired or refurbished unit or if it is a reallocation of an existing unit, abb offers a secure and efficient solution to meet your needs. Commissioning procedure of power transformer in transformer testing it can be classified into power and distribution transformers. Precommissioning test of transformer at site free download as pdf file.
Transport, installation and commissioning of power transformers. Modern transformers are designed to closer tolerances than transformers in the past. Aug 11, 2017 i already posted a couple of articles about the power transformer. It is necessary that all testing tools are available before starting the work. These considerations are more easily managed at the place of transformer manufacture, where activities are undertaken in a controlled environment and tho. Ac voltage is preferable to dc voltage for transformer testing because ac voltage simulates the internal stress that the transformers face during operating conditions. Power transformer testing and commissioning guidelines r. Transformer installation, inspection and commissioning. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to.
Transformer should be inspected by authorized electrical inspector and get permission to energize the same 2. Neta is not only for commissioning new equipment but for testing the reliability and performance of existing equipment. Method statement for installation of transformers safe. Testing and commissioning procedure for electrical installation 1. The following tests are routinely conducted in the field on the transformer. Along with different precommissioning tests, different instruments associated to the transformer also to be checked. Check the value after one minute and record the steady value. 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. Watch this video to know how schneider electric is aiding this growth and making the world more energy. Jan 26, 2017 schneider electrics transformer erection and commissioning schneider electric india. Schneider electrics transformer erection and commissioning. Transformer installation, inspection and commissioning an. Before commencement of any test make sure the surroundings near clear off from any unwanted materials etc, and make proper approach, scaffolding etc.
Along with different pre commissioning tests, different instruments associated to the transformer also to be checked. Ensure adequate lighting is provided in the working area at night time. For many tests, this will be almost essential to diagnose problems effectively in the future. Selected lab waste neutralization fume hoods x special gas manifolds vacuum air system compressed air system emergency shower eyewash sinks and drains x electronic calendaring or directory plumbing systems. All transformers are subjected to the following pre commissioning tests. Transformer testing commissioning, routine, diagnostic. Testing power transformers highvoltage transformers are some of the most important and expensive pieces of equipment required for operating a power system. Sep 28, 2018 you can find below a comprehensive switchgear testing and commissioning procedure.