Answer Posted / vimal m
Transformer Ratio Test
The performance of a transformer largely depends upon perfection of specific turns or voltage ratio of transformer. So transformer ration test is an essential type test of transformer. The voltage should be applied only in the high voltage winding in order to avoid unsafe voltage.
Procedure of Transformer Ratio Test
First, the tap changer of transformer is kept in the lowest position and LV terminals are kept open.
Then apply 3-phase 415 V supply on HV terminals. Measure the voltages applied on each phase (Phase-phase) on HV and induced voltages at LV terminals simultaneously.
After measuring the voltages at HV and LV terminals, the tap changer of transformer should be raised by one position and repeat test.
Repeat the same for each of the tap position separately.
The above transformer ratio test can also be performed by portable transformer turns ratio (TTR) meter. They have an in built power supply, with the voltages commonly used being very low, such as 8-10 V and 50 Hz. The HV and LV windings of one phase of a transformer are connected to the instrument, and the internal bridge elements are varied to produce a null indication on the detector.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Why we make earth connection with Transformer Body and What will be the minimum size of copper wire as per code with respect to KVA rating of Transformer?
What is meant by vector group
WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....
how we calculate the withstansing current capacity of wires&cables?
what is efficient motors and how it is different from normal induction motors
What is difference between mcb and mccb.
what is booster? and how it is connected in a circuit?
What will happen if we introduce negative feedback to a control system that uses a positive feedback?
list the type of vfd? wich is sutable for heating kiln?
why connecting surge unit in contactor coil
can i connect REF and Differencial relay in 1 CT core for transformer protection?
What are merits & De-merits of State-Space Method? What is series programming, parallel programming, general programming & direct programming ? And, difference between these programmings Techniques ?
why current flow to the opposite direction of flow of electrons???????????
how is calculated the quantity of weight in hot test xlpe?
how to conduct dc resistance test for rotor of an alternator and how to measure the rotor dc resistance value theoritically?
