Interested to Buy Any Domain ? << Click Here >> for more details...
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
A 11KV, 1200 A breaker combination fixed in a cubicle for HT motor.Is normally for 11 KV motor fuse is using? if Yes, What range fuse is required?
how to select electronic timer(Star-Delta) setting for diff. rating motors
what is the function of choke in the flourcent tube lights and why the colour is in white mostly in flourcent tube lights
In a single how much maximum current and watts using
What are the various kind of cables used for transmission?
please give me all the Alarm .Trip ,Safety Relays & Conditions of UPS Systems mail me on ashokbabunhce@gmail.com
What are the basic & Majour problems in UPS ?
How can I known multiplying factor .without multiplying table
tell me about roaster switch .& what is the function in transmission & distribution?
what is the difference between the characteristics of two different phase bushing of any transformer
what is effect of leading power facter on the system and billing
hello friend i wish to study a course related to the electrical construction, controlling and monitoring , which course i want to study? pls give me the name of institute?
EHV current carrying parts need to have smooth finish,then how can a 245kv GIS with emery finish can run so long?
Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?
IN dc capacitive reactance is??
