there are various types of trasformer tests are here
Open Ckt test
Short ckt test
IR value test
Vector group test
Phase sequence test
Magnetizing test
turn ratio test
T/f oil insulation breakdown test
and so on............
see the following:
http://ezinearticles.com/?Testing-a-Transformer--How-To-Accurately-Test-A-Transformer&id=56803 http://en.wikipedia.org/wiki/Transformer
<<>>
The main transformer test is known as the hi-pot test. It is where a high potential voltage is imposed on the Transformers winding for a specific amount of time. If there is no break down in the insulation factor the transformer passes the test.
Testing of Transformers The structure of the circuit equivalent of a practical transformer is developed earlier. The performance parameters of interest can be obtained by solving that circuit for any load conditions. The equivalent circuit parameters are available to the designer of the transformers from the various expressions that he uses for designing the transformers. But for a user these are not available most of the times. Also when a transformer is rewound with different primary and secondary windings the equivalent circuit also changes. In order to get the equivalent circuit parameters test methods are heavily depended upon. From the analysis of the equivalent circuit one can determine the electrical parameters. But if the temperature rise of the transformer is required, then test method is the most dependable one. There are several tests that can be done on the transformer 1.Winding resistance test 2 Polarity Test 3 Open Circuit Test 4 Short Circuit Test 5 Load Test contact me for more details
There are a number of tests that may be performed. As a minimum you should perform: TTR (Turns Ratio) at all tap positions Insulation Resistance (Megger) - PI is recommended but if small transformer at least a DAR. This is widing-winding, winding- ground, and core-ground (if ground strap is accessible) Power Factor test is recommended, both windings and any liquid filled bushings Excitation Current Test is recommended Take an oil sample and send to reputable lab for analysis.
transformor polarity test are used two know about the poalrity of a trasformor .for these purpose to traansformor are used and his low voltage winding and high volatage winding are coonected in parallel to each other the secondry windings of a transformor which has commonly high voltage winding fuse are coonnected to his secondry side of a transformor a man point to be noted here that a wire used for fuse are so small rating similarly when the polarity of atransformor same no current will be flow as a reason the dont blow.otherwise when the polarit are different the current wiill be flow and fuse will be blow out
Berry transformer has good ventilation provision as compared to other types of transformer
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.
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.
A variety of electrical transformers are produced for a variety of purposes. All of the types use the same principle discovered by Michael Faraday, and employ many of the same parts. The various types include. Audio transformers, Instrument transformers, Pulse transformers, Power transformers, RF transformers. .
A 'power transformer' is a category of transformer used within electricity transmission and primary distribution systems. Relays are widely used with power transformers to provide various types of protection that will act to disconnect the transformer in the event of a fault. Examples of these relays include Buchholz relays, earth-fault relays, and differential relays. Relays are also used to operate a power transformer's automatic tap-changing mechanism in order to compensate for changes in load.
Berry transformer has good ventilation provision as compared to other types of transformer
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).
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.
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.
IQ tests
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.
A variety of electrical transformers are produced for a variety of purposes. All of the types use the same principle discovered by Michael Faraday, and employ many of the same parts. The various types include. Audio transformers, Instrument transformers, Pulse transformers, Power transformers, RF transformers. .
test of controls and substansive tests
There are two types of transformers:- 1. Step-up transformer & 2. Step-down transformer. A transformer used to increase the voltage is called Step-up transformer. A transformer used to decrease the voltage is called Step-down transformer. Uses of step-up transformer:- in power supply stations, in picture tubes of TV, computer monitors, halogen lights, etc. Uses of step-down transformer:- in supply of electricity to homes, in the power supply to the low voltage devices like radio, music systems which are run by AC mains.
The four most common types of objective tests are multiple-choice tests, true/false tests, matching tests, and fill-in-the-blank tests. These types of tests are typically used to assess knowledge and understanding in a quick and efficient manner.
there are many types of achievement tests including the ones that you can try out for and international baccaulerate program... i guess
There are many different types of diabetes tests out there. There are good brands and bad brands. It all depends on your budget. Here you can buy and see different types of tests. http://www.americandiabeteswholesale.com/