One type of a test for a transformer is a megger test. Sp0407r01 commissioning tests for new hv cables up to 33 kv. 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 amounts to a rigorous examination of the transformer intended to. Transformer testing commissioning, routine, diagnostic. It is difficult to be precise as to the value of resistance that should be obtained. Electronic copies of these checklists are available upon request. These forms are customized for each project to assure design intent compliance.
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. Sp0407 commissioning tests for hv underground cables swp pdf file, 221. Mn000301r171 test and commissioning manual ver 1 pdf file, 1. In addition to these, the transformer also goes through some other tests, performed on it, before actual commissioning of the transformer at the site. Low voltage dry type transformer construction checklist page 2 of 4 version 0206 transformer information equipment tag location system circle one power or lighting 208120 or 480277 normal or emergency manufacturermodel number serial number kva voltsphase rating bus configuration service area other comments. Commissioning tests for hv cables up to 33kv swp ergon energy. 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. Check for level, colour of oil in the sight glass for outdoor current transformers. Commissioning test for power transformer biology essay. Project standards and specifications page 3 of 40 rev. Ensure the ct is connected to system properly in all respect primary and secondary. Current transformers testing and commissioning guidelines.
The test performed before commissioning the transformer at site is called pre commissioning test of transformer. Along with different pre commissioning tests, different instruments associated to the transformer also to be checked. 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 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. For many tests, this will be almost essential to diagnose problems effectively in the future. Transformer should be inspected by authorized electrical inspector and get permission to energize the same 2. Transformer is the most important equipment in the electrical power transmission and distribution system. The electrical tests recommended for commissioning a transformer include. Routine tests and type tests of transformers electrical4u. Various routine test of power transformerpart1 electrical. The test engineer may not directly perform all of the following tests and. A primary part of commissioning a transformer involves testing it after its installation in the field. A visual check at ct current transformer circuits, not to be kept open.
Restoration of all isolation links and connections. Testing and commissioning of all electrical equipment from 415 volts to 2 kv system. We also offer a combination of the measurements on the transformer with a dynamic resistance measurement on the onload tapchanger. The testing and commissioning of an electrical apparatus shall verify. Below is a standard method statement which can be used as learning purpose and to prepare further professional method statement for testing and commissioning of transformers. May 10, 20 special tests of transformer is done as per customer requirement to obtain information useful to the user during operation or maintenance of the transformer.
Transportation, erection, testing and commissioning ieema. 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 good chance that we have. In other words, make the current flow only in capacitance region omit inductance in the. What are precommissioning tests of transformers answers. Cv engineer electrical testing and commissioning ht, lt, ct. The following report forms are presented as examples of system verification checklists svc, functional performance tests fpt, site progress quality control spqc, resolution tracking forms rtf, and commissioning specifications. This method statement will give a brief steps to be carried out for testing and pre commissioning of transformers. All transformers are subjected to the following pre commissioning tests. To study about pre commissioning test of power transformer. The final content and test parameters are based on the owners project requirements.
Project standards and specifications general commissioning. Preterminated cables such as transformer leads in padmount substations. There are a multitude of checks and tests performed as a transformer is being assembled at a substation. Electric power systems services electrical power system study by etap testing and commissioning. We have experience with transformers from all manufacturers. 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.
Ir values a for 3311 kv power transformer 2500 v megger is to be need. Testing and commissioning procedure for electrical installation 1. This test should be carried out with the aid of a v insulation resistance meter. Onsite tests on high voltage power transformers is of increasing interest as part of. Along with different precommissioning tests, different instruments associated to the transformer also to be checked. 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. Sample commissioning documents facility commissioning group. Commissioning checklists 05242010 dylan mechanical. Pre commissioning of power transformer engineering essay. Transformer testing and commissioning we test and commission transformers, whether new or refurbished. Apr 03, 2017 power transformer testing and commissioning guidelines r 1. Before commencement of any test make sure the surroundings near clear off from any unwanted materials etc, and make proper approach, scaffolding etc. Words in the first column of the following table are defined terms and. 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.
Before commencement of any test make sure the surroundings near clear off from any. The site tests of transformers are the precommissioning tests, periodic or condition monitoring tests, and the emergency tests. The wires have 20 a sockets on the end which is connected to the test switch. 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. Inspection of control and relay panel, preparation of test report and cable schedule for substation, power plant, and process plant. Case study on pre commissioning of power transformer. To confirm the physical condition and electrical characteristics of current transformer installed in the installation. Insulation resistance and continuity of the winding should be checked by v megger 3. Insulation resistance values of various winding should be checked. All pre commissioning tests are conducted for all equipments. Specialist testing for ferroresonance is not included in this swp.
Lets start with transformer precommissioning checks and tests and later on with afterreceipt checks. 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. During measurement of insulation resistance, the transformer must not be connected with any external lines or lightning arrestor etc. Check for cracks in door current transformers, and that equipotential point of window type cts has been connected to the busbar. Liability and ignorance can cause a pit hole for money if one isnt aware of complexities. Although, the startup sequences and commissioning procedures differ to some. The purpose of this swp is to standardise and prescribe the method for pre commissioning and commissioning tests on high voltage underground cables up to 33kv.
The ir values obtained should be comparable with those indicated in the manufacturers test reports. Power transformer testing and commissioning guidelines r. The following tests shall be performed on the equipment that comprises the. Eirgrid commissioning procedures rev 0 pdf document. Lighting system and controls piping dx refrigeration piping condensate piping hydronic and domestic water ductwork. By a printed numeral and word on the outer surface of each core eg 1 one. Contractor shall develop prefunctional checklists with the startup plans. Transformer precommissioning tests and afterreceipt. After, installation of power transformer, several pre commissioning tests to be done before putting the transformer in service. The commissioning personnel must have a basic knowledge of handling electronic equipment. The standard applied on pre commissioning test is to all type of power transformer included instrument transformer stepvoltage, tap changing, winding resistance, vector group, polarization index and insulation of transformer. Of course, for commissioning the transformer, we install the complete range of accessories, such as maintenancefree dehydrating breathers, voltage regulators or monitoring systems. Transformer precommissioning tests and afterreceipt checks you. A visual check at vt voltage transformer circuits, all the links to be closed.