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What is the purpose of OC and SC tests on single phase transformer?
Wiki User
∙ 12y ago
Open circuit and short circuit tests are performed to determine transformer characteristics. In the case of a single phase transformer, SC tests would be performed to determine the impedance. The open circuit test will give excitation information (% excitation at specific voltages, often 90%, 100% and 110%, and no load losses).
Wiki User
∙ 12y ago
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How do you calculate phase voltage of a three phase four wire system?
Phase voltage is determined by the wiring of transformer that serves the building. To test phase voltage use a volt meter and put one probe to ground and the other to each phase and observe the reading, this will give you a phase to ground voltage reading. Next test phase to phase (1 to 2, 1 to 3, and 2 to 3) to see if it's 208, 240, 277, or 480. Only licensed electricians should perform these tests. DAW
What is the significance of the stationary phase in gas chromatography?
The stationary phase is the medium that is used to react with the mobile phase. The molbile phase is sent through the column. The stationary phase is inside the column and reacts with your carrier liquid (mobile phase) which contains the sample that you want to be analyzed. Stationary phase is different for every column because you need different mediums for different tests.
What is a list of the types of genetic testing?
There are three types of genealogical DNA tests, autosomal (atDNA), mitochondrial DNA. A list of single nucleotide polymorphisms (SNPs) is returned.
What's wrong with a 240V outlet that tests at 277V?
What's the reading at the service panel? What do regular 115V outlets read at? What kind of meter are you using? Chances are you have 480/277V 3 phase power to this building. Whoever wired the outlet used a 277V feed, possibly because 240V was not avaliable. You should call an electrician, repair of this problem may involve instalation of a transformer.
What are lipid tests for?
The purpose of blood lipid testing is to determine whether abnormally high or low concentrations of a specific lipid are present.
Load test on single phase transformer?
The dc tests that can be done on a transformer are to measure the resistance of each windings and to measure the insulation resistance between the windings and between each winding and the transformer case.
What are the purposes of performing no load test for the transformer?
These two tests are performed on a transformer to determine (i) equivalent circuit of transformer(ii)voltage regulation of transformer(iii) efficiency of transformer. The power required for theseOpen Circuit test and Short Circuit test on transformeris equal to the power loss occurring in the transformer.
What the BDV stands for the transformer oil?
Blowdown Valves In case of Transformer oil the meaning of BDV is break down voltage. It refers to the one of the tests of the oil.
What is a grandfather clause and What is its purpose in literacy tests?
What is a grandfather clause, and what was its purpose
What is a grandfather clause and what was it purpose in literacy tests?
What is a grandfather clause, and what was its purpose
How do you calculate phase voltage of a three phase four wire system?
Phase voltage is determined by the wiring of transformer that serves the building. To test phase voltage use a volt meter and put one probe to ground and the other to each phase and observe the reading, this will give you a phase to ground voltage reading. Next test phase to phase (1 to 2, 1 to 3, and 2 to 3) to see if it's 208, 240, 277, or 480. Only licensed electricians should perform these tests. DAW
How calculate zero phase sequence capacitance of transformer?
In my experience, the zero sequence of transformers is not calculated, it is directly tested following ANSII/IEEE guidlines for Z1no, Z2no, and Z1ns tests (for three phase, three winding transformers). Rough estimations of zero sequence impedance can be determined based on the positive sequence and core form of the transformer. A Shell type core will have a zero sequence of ~100% the positive sequence because the flux stays in the core / follows the same path as it does for positive sequence currents. For a core type, the zero sequence will be ~80-90% typically, because the flux must travel outside the core. This is for three winding transformer.
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Get scores or grades on tests, homeworks, and quizzes.
What is the classification of tests according to purpose?
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What is the purpose of the empty can test?
It tests for the supraspinatus tendon or impingement.
How do you calculate rating of 11 kv transformer?
The KVA rating of a transformer is based on how much heat the transformer can dissipate. The BIL rating is based on how well the windings are insulated. There are other "ratings" as well. Rough calculations can be done, but tests are generally performed to prove the calculations (transformer designers will design on the conservative side to insure the transformer meets specification). These type of calculations are best done by a computer. You will struggle to determine the hot spot max temperature rise in a transformer by hand.
What is phasing out test on the 3 phase induction motors?
"Phasing out" is a method to either check the phase shift across a transformer due to the winding characteristics or phasing to another transformer to ensure that the transformer is connected the same way. These tests usually apply to three phase Grid transformers. Grid transformers can be wound in a number of ways. The simplist version is described as YY0. That is two Y wound three phase winding laid directly against each other. There is no phase shift ie 0 degrees. Other transformers can be wound YD that is a Y winding wound against a delta winding. Automaticallly there will be a phase shift across this winding. Field test involve energising the high voltage side with a 3 phase supply. Voltages are then measured across windings. Ie measure the input voltage on Primary side Eg 230 Volts then measure the volts on secondary side between each phase to fill up a test table. eg Rp Rs, Rp Ys, Rp Bs etc.... From these measurements it is possible by drawing a suitable vector diagram of each phase to show the phasing of each phase, the ratio and the angle of the transformation across the transformer. An alternative (simpler) method is to use an oscilliscope from this superimpose the to voltages and measure the angle between them. It isn't so effective in the field with large voltages and not quite as accurate. Lastly to phase the new transformer with the existing network measure the voltages of each phase to the corresponding phase on the network. The reading should be zero if youre phasing is correct and to confirm full phase voltage between phases.
