Answer / baikunth

As we know DC current is uni-directional.The deflection
system attached to the megger is generally PMMC type which
eorks only with DC. Another reason is when DC current flows
in the winding of a motor or transformer the capacitance and
inductance do not act upon the current and the only leakage
current that flows through the insulation is measured.This
gives faster and accurate measurement.If we use an AC megger
the reading will be erroneous because the capacitance of
winging will allow to flow high current and breakdown of
insulation will not occur due to alternating action of
current.

Answer / abaya

We can create voltage like 5kv,1kv,using DC but we can not produce that type of voltage using Ac because it require more space as compare to Megger.

Answer / k.prakashchandra

Further you maintain potential difference for a substantial
period,which is possible with DC

What are factors to be considered while we selecting the Core Balance Current Transformer for Earth fault protection

0 Answers  

---

what is the meaning of harmonic in AC waves and when which are prduce and what is the effects on line and give any other information about harmonics

1 Answers  

---

what is diffrent of RCCB & MCCB

6 Answers  

---

Unit of Magnetic Flux Density a) Tesla b) weber c) Hendry d) Farad

3 Answers   Ecil,

---

What is the maximum advisable distance where it is required to interconnect a 500 KVA 480 V 3 ph transformer and the main panel or MCC ignoring the voltage droop affectation, does it is exist any standard about it?

2 Answers  

---

---

why after termination of HT cable armoured earth connected one end, why not connect other end.pls tell me correct answer.

3 Answers  

---

what is the difference between capacitive voltage transformer & inductive voltage transformer.

3 Answers  

---

what is PWM in IGBT and how it works for drive.?

0 Answers   BRG,

---

Draw SLD feeding from the SS up to distribution board of the load, calculate cable size, breaker sizes, and meter for the following case: Ground Floor: electric room, pump room, 5 shops, each is 15 KW First Floor: 5 shops, each is 15 KW Second Floor: showroom 30 KW Service Loads: water pump 3 KW (3ph) , fire pump 3 KW (3ph), and one DB service 12 KW (3ph).

0 Answers   FEWA, HMK,

---

difference between buscoupler & bussection?

1 Answers  

---

Define the overload capacity of the motor.

3 Answers   Alstom, Maynilad,

---

What is different between MCB & MCC & isolator switch

1 Answers   Standard Chartered,

---