Answer / 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.

Answer / a.p.nanjappa

this is a special test.refer to manufacturer.

Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078

0 Answers  

---

how to get 48 V DC I have ... 1. 12 volt power supply board 2. DC power supply ( max. 30 v) 3. 9 volt batteries ( 2 - not chargeble)

2 Answers  

---

how to calculate micom relay earth falt time and current sertting

0 Answers  

---

what is the earth resistance ?

5 Answers   Bhel, Cummins,

---

how to calculate the cable size depending on the transformer rating

2 Answers  

---

---

why the LED of my electrical meter glows even after the line has gone. what actually the reason?

3 Answers  

---

what kinds of Transformer oil grade is better for power transformer ?

0 Answers   KSRM Steel Plant,

---

why we use dc motor instead of ac motor?

7 Answers   Air Force,

---

Can any answer me ,What will be the range of C.T coil for L&T energy meter EM301 used for 180 kva DG set

0 Answers  

---

why we generate transmit and distribute electrical supply in multiple of 11

6 Answers   NHPC,

---

give me name of current and volatge control device

1 Answers  

---

in case of transformer the power factor is depend on input or the output

1 Answers  

---