Answer Posted / dinesh

Below equation is helpful in calculating the knee-point voltage of Protection CTs
Vkp = ALF(VA / In + Rct x In)
ALF = Accuracy Limit Factor
VA = Burden
Rct= Resistance of the secondary winding
In = 1A or 5A
For example if the CT Ration is 500/1A, Burden is 20VA and Class is 5P20, then Vkp is 20(20/1) = 400V.

how we can decide that what value of ht line will come to any commercial building? (ans except According to the building load)

1715

---

During Starter Panel Com missing I Found The Main Incomer 40Amp MCB 10KA Trip When Motor Change Star To Delta Motor Rating 20HP BUT When We Use Same MCB To Other Motor It Does Not trip Or What Is Necessaries for Star Delta Starter MCB SFU MPCB OR MCCB And What are The Breaking Capacity of MCCB in the Motor above 15HP

1937

---

in what type of applications v can use q meter?

2197

---

a governer in an Ic engine controls the

1234

---

why effective resistance should be more than static resistance in transmission line?

2153

---

What is critical disruptive voltage?

1376

---

how to measure the transformer resistance values(dyn11)?and howmuch the minimum value?

2193

---

A d.c. Shunt motor is found suitable to drive fans because they require?

1390

---

How does the phase sequence controller works, how it identifies the phases? confirm working principle

2162

---

Draw the line diagram of diffretial relay connected to transformer?

2496

---

If ROC does not lies inside unit circle,then ? a) Fourier transform converges b) Z transform converges c) Hatly transform converges d) Colpit Transform converges.

2341

---

What do you mean by per capita requirement of electrical energy in india

2324

---

What happens to a line-frequency of high-frequency transformer when it is first energized/ re-energize?

2213

---

How to check the cable fault / hv test of transformer cable.

1946

---

How I can Compare 120v/60Hz versus 220v/50Hz ? Please tell me both advantage and disadvantage ......

2081

---