Why is short circuit test done on high voltage side?
The low-voltage (LV) winding is shorted. A balanced three-phase, alternating current (AC), variable voltage source is used to excite the high-voltage (HV) winding. Thus, all short circuit tests are performed on the HV side because the power supply capabilities (and cost) are reduced.
Why is SC test carried out by Energising HV side?
SC test is conducted on HV side and the measuring instruments are also placed in the HV side & the LV side is shorted. The main reason for performing the SC test on the HV side is that the rated current will be low in HV side when compared to the rated current in LV side.
Why OC and SC test is performed on HV and LV side respectively?
Short circuit test in the transformer is conducted on the high voltage side and low voltage side is short-circuited. In HV winding, the rated current is less than LV winding. As rated current is less on HV side, it is convenient to conduct this test on HV side by short-circuiting the LV terminals.
How is a short circuit test carried out?
Short circuit test is carried out at rated current on high voltage side with L.V side as open-circuited. It is carried out on H.V side because rated current easily occur on H.V side compared to L.V side.
Why is a short circuit test done on HV side?
As the rated current is lesser on HV side as compared to the LV side, it is convenient to conduct the test on the HV side so that the meters used for the test are oflower range. Here priority is given to the current because we are trying to find out the series parameters from the test.
How are low voltage and high voltage short circuited?
Where X 0 is the inductive reactance, I W is the core loss current, I μ is the magnetizing current. In the short circuit test, usually, the low voltage side is short-circuited by a thick conductor. As we can see that in the figure an ammeter, a voltmeter, and a wattmeter are connected on the high-voltage side.
Why is an open circuit test done with the low voltage?
Therefore the current that will flow in the circuit in the open circuit test is very low so the measurement of quantities voltage, current and power must be in the low voltage side so that the corresponding value will be readable in the instruments. And, therefore the open circuit test must be performed in the low voltage side.