Answer / s kannan

MF is not for panels for relays and meters only. Meters will be connected with CT and PT's secondary. If we want to calculate MF for meters like Voltmeter and Ammeter Just follow the formula Mf= CT Ratio X PT Ratio.
Eg:
CT Ratio: 600-300/1-1A(Adopted ratio is 300A as primary) PT Ratio: 33KV/rt3/110V/rt3/110V/rt3
Then MF:(300/1)X(33000/rt3/110/rt3)
(300/1)X(33000/1.732X1.732/110)
(300)X(33000/110)
(300)X(300)
90000
Means Multiply the particular meter's reading by this 90000 for obtaining the genuine value.

who is make controlling in the reactive power that genarted in AS genrator(the exitaion currnt or exitation voltge)

2 Answers  

---

For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?

0 Answers   Hormozgan Steel,

---

What are the components of feedback control system?

0 Answers  

---

what is working of Master trip relay ?

9 Answers  

---

how a synchronous motor is used as a resistor,capacitor and an inductor?

3 Answers   Technocon Services,

---

---

Dear sir,We have a 7.5hp motor,it was running smoothly and suddenly one winding is carring more current then others(r=6.5,y=6.3,b=10)..whts wrong with tis...?

5 Answers   Hindustan Motors,

---

Explain the power rating of a bulb, say 60W, what if the voltage changes

4 Answers  

---

My system is 22kv/3.3kv transformer. client is asking to use NGR, but as we have dedicated Neutral Earthing systems which has a value less than 1 Ohm. So i want solid comparision. Why i should not use NGR as my system is already protected.Can any one help me to get out of this.how should i reply on basis of some great comparision and calculations. Please help

2 Answers   Ariel,

---

which motor is used in watch..??????

3 Answers   Bhushan ITI,

---

is the secondary voltage of current transformer greater than primary voltage,,,,,,,,] give the example with ct burden,current ratio,and primary and secondary side voltage?

2 Answers  

---

PRV (Pressure relief valve) Trip with oil splash outside power transformers

1 Answers   Khan,

---

why mccb is not tripping when phase & neutral terminal are interched ?

4 Answers  

---