Answer Posted / mayank trivedi

PRIMARY WDG IS KEPT OPEN. AND VOLTAGE IS APPLIED AFTER
CALCULATING THE KNEE POINT VOLTAGE. I.E BY THE GIVEN FORMULA.

Vk= If(Rct + 2Rl)

SUPPOSE THE KNEE POINT VOLTAGE IS 300 AND SPECIFIED
MAGNETISING CURRENT IS ABOUT 0.65 AS GIVEN ON NAME PLATE.

THAN 10 % VOLTAGE IS APPLIED ON SECONDARY WINDING OF 300V
I.E 30 VOLTS AND THAN INCREASED IN 10 NUMBER OF STEP.

AT FULL KNEE POINT VOLT THE MAG CURRENT SHOULD BE WITHIN
RANGE. THAN ST IS SAID TO PASS THE THE.

THE MAG CURRENT IS MEASURED BY CONNECTING A AMMETER IN SERIES.

How to test the vector group of a Yd11 transformer? what are the relations to be checked between various vectors to confirm this vector group?

4471

---

What is the maximum number of swithes that can be connected in series up to down stream point in an LV Distribution system?

2003

---

what is the power factor used by the PHCN in nigeria? 2. what is the difference between an alternator and generator. 3. Generation of poweris in KV but how is transmission is in MW. 4.If the transmission of power is 20,000MW how can it be increaesed to 80,000MW

8615

---

how to determine ct ratio in ht vcb?

1841

---

what is the effect of un-synchronized power.

2047

---

How phase to phase voltage comes 440V.

2089

---

Why an ac systems are preferred over dc systems?

1103

---

can u describe the method used for protection of transmission line.

2219

---

While testing LA mast,What are the parameter limits ?

1899

---

Tell me in detail about c.t. And p.t. ?

1155

---

How we calculate the size of ht cable for any transformer

2086

---

what is the differencce inn series and cascade connection??

4723

---

what should be the ideal gauge of wire (In sq mm) for different loads in Ampere?

1441

---

Hello to all, Please someone can send me HPCL ELECTRICAL Engg. Sample papers to me? Its urjent....my email address is.... raviasiapacific@gmail.com

2135

---

can anyone show me how the 3 phase power is supplied to socket outlets?

2018

---