Public reporting burden for this collection of information is estimated to average 1 hour. Magnetic balance test of transformer is conducted only on three phase transformers to check the imbalance in the magnetic circuit. Current transformer saturation, ratio and polarity test set description the megger mct1600 test set is a lightweight, robust, portable unit used to automatically or manually perform saturation, ratio, polarity, demagnetizing tests and insulation tests on current transformers. Testing of power transformers seems like a similar experience. Transformers have been used at powerplants since the inception of. Mainly two types of transformer testing are done at manufacturer premisestype test of transformer and routine test of transformer. Tm 5686 power transformer maintenance and acceptance. Pdf evaluating transformer condition using dga oil analysis. Analysis of evaluating methods for transformer chopped. Silsbee contents t page introduction 317 generalprinciples 318 nullmethod 321 deflectionmethod 325 experimentalresults.
This report must not be used by the recipient to claim product endorsement by nvlap or any other agency of the u. Transformer tests best balikesir elektromekanik sanayi tesisleri a. Microsoft word cover page job quality assurance plan. Examples of transformer noise test results are submitted and precautions to be taken were discussed for the purpose of decreasing of the noise which will. All test data moisture and oil data problems incurred inservice data time energized and release to operation.
Tm 5686 angular displacement rotation between the primary and secondary h. We therefore conclude that at no load condition or open circuit test, the ammeter reading gives the no load current which is very small. The magnitude of the losses has increased significantly since the last study. Able to excite all natural frequencies of the windings ideal impulse test 1. Checking reverse test lead or winding connections at start of each test. This number decides the action needed to be taken after the fault occurs. Final report by power transformers evaluation standards. Smit transformer services tap changer specialists hold the mr premium service provider certificate. Shifted waveforms for better comparison after chopping.
The test may be performed at the same time as measuring winding resistance or as a separate test. Current transformer testing electrical test equipment. It has been developed with the assistance of bureau of reclamation engineers responsible for operating and maintaining transformers at important. Transformer test report free download as excel spreadsheet. Ebp003c0350ss, ebp003c0500ss, ebp003c0700ss lvd test. Department of industrial electrical power conversion the transformer page 4 of 6 figure 2 with reference to fig. Analysis of evaluating methods for transformer chopped impulse tests figure 5. Performance test of faulty distribution transformers along. This test also performed as a routine test of transformer. Apply the formula or plot the values in the graph to get the vector group. However, the test technician understands what the test set was doing while all.
Includes test with shorted terminals of untested windings 4. The ac hv test value should not surpass 75% of the factory test value. When ac hipot tests are used for routine maintenance, the power transformer can be examined at. Except where noted otherwise, testing was conducted with test levels, duration, and procedures as defined in iec 60691 r2001 and iec 602651 r1998 for the following general ratings. Laboratory transformer fra test results for deformation 1 in mf.
If this test report form is used by noniecee members, the ieceeiec logo and the reference to the cb scheme procedure shall be removed. Current transformer testing swp check this is the latest process zone version before use. Variable ac source the labs variable ac source shown in figure 4. Ebp003c0350ss, ebp003c0500ss, ebp003c0700ss emc test report.
The procedure of the transformer ratio test is simple. Transformer testing type tests and routine tests of. The mct provides a microprocessor controlled variable voltage output and. Hipot test is typically used for acceptance testing or after transformer repair testing. It has been developed with the assistance of bureau of reclamation engineers. Cbip manual on ehv substation equipment maintenance. See the manufacturers instruction manual for the specific turns ratio. First keep the tap changer of transformer in normal position. Checkup position name taps measured ratio power va class measured ratio measured ratio. Current transformers play an important role in the monitoring and protection of electrical power systems.
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. Turn in revised prints and test reports, which should include the following. The route survey report is for safe and speedy transport of over. 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. Results of a turns ratio test determining a short circuit between turns at low voltage side. Release to operations and report energization information to the tne office. Impulse test concepts by philip j hopkinson, pe good impulse test. Current transformer saturation, ratio and polarity test.
Higher line terminal voltage than can occur in the field 2. The test voltage values, impulse shapes, and number of impulses at different voltage levels must be stated in the report. A numerical value called priority number pn is assigned to each fault which depends on the fault value from the above three tables. Conclusion we therefore conclude that at no load condition. Report on failure of 400220kv33kv, 315mva transformer bhel.
Transformer oil test report free download as pdf file. The most recent test was conducted in lugano, switzerland in early 2014. But, as the other side of transformer is open circuit, there is no output power. Diagnose software from etp system trr unit um1b from unitronics. The wattmeter reading represents the coreloss under no. Measure the voltage at the both primary and secondary termination at all the phases. Routine tests and type tests of transformers electrical4u.
The test results presented in this report relate only to the object tested. It is typically used for test specimen that have small capacitance and as a result the power factor tan delta of the test circuit is rather high. However, to get an insight of this field test on faulty distribution transformers especially in the developing countries a singlephase voltage transformation ratio test, stepup voltage ratio test, insulation resistance test, earthing ground resistance test, dielectric oil test, load test, etc. Page 3 of 9 standard work practice sp0507 ver 5 ergon energy corporation limited abn 50 087 646 062 ergon energy queensland pty ltd abn 11 121 177 802 rated knee point voltage 950 volts, maximum secondary winding resistance 3 ohms. It is carried out as a type test as well as routine test. Imia working group was established in 1995 to examine this topic and presented a report at the 1996 conference. Now disconnect the transformer neutral from ground. Cts are instrument transformers used for converting primary current into a reduced secondary current for use with meters, relays, control equipment and other instruments the importance of instrument transformer tests is often underestimated. Pdf cross test comparison in transformer windings frequency.
Transformer bushing cts should be tested using the current ratio test method before the transformer has been completely assembled. Pdf power transformer noise, noise tests, and example test. Mt779601 6sep15 hv test pty ltd leader in high voltage test equipment pula steel selebi phikwe transformer test report 2. Sweep frequency response analysis test or in short sfra test can detect efficiently, displacement of transformer core, deformation and displacement of winding, faulty core grounds, collapse of partial winding, broken or loosen clamp connections. 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. To achive this, about 78500 mw of generation capacity and matching transmission and distribution systems are to be added during 11th plan. Turnsratio test results should not deviate more than onehalf percent from either the adjacent coils or the calculated ratio. Our own oil analysis laboratory directly links the results from. In addition to that some transformer tests are also carried out at the consumer site before commissioning and also periodically in regular and emergency basis through out its service life. 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 ratings for the switches discussed in this test report were obtained from preferred ratings defined by industry standards and user requests. Tdms is also a powerful report editor that allows to create professional test reports that can be exported in access format. Three automatically selected excitation test voltages.
Apply 3 phase supply voltage 415 v ac across the primary termination of the transformer. So transformer ratio test is an essential type test of transformer. Potential transformer testing ptvt valence electrical. Equivalent circuit diagram for a transformer in noload. Transformer oil test report transformer materials scribd.
The typical excitation current test data pattern for a threelegged core transformer is two similar current readings and one lower current reading. Type test and routine test of transformer electrical mastar. The connection diagram will indicate the connections of the various windings. The power loss is also a very convenient number when checking the accuracy of measurements.
Meggers range of current transformer test equipment allows you to construct an in depth test and maintenance programme to prevent problems before they occur. So for ensuring proper performance of electrical power transformer, voltage and turn ratio test of transformer one of the important tests. See appended table refers to a table appended to the report. Pdf frequency response analysis fra is an important tool used for. A test technician connects the leads, pushes the buttons, and records the results. After a test is completed, grounds should be left on the tested item for twice the duration of the test, prefer ably longer. It consists of singlephase transformer, variac and lamp bulb connected in series with the. This report is not valid as a cb test report unless signed by an approved cb testing laboratory and appended to a cb test certificate issued by an ncb in accordance with iecee 02. A test set operator connects the leads, pushes the buttons, and records the results.
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