• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

How Engineering Works

  • Home
  • About Us
  • Electrical Engineering
    • Interview Questions
  • Privacy Policy
  • Disclaimer
  • Contact Us
  • Blog

Why AC needs more insulation than DC at same voltage level?

November 17, 2017 by Bruno

DWQA Questions › Category: Basic of Electrical Engineering › Why AC needs more insulation than DC at same voltage level?
0 Vote Up Vote Down
Bruno asked 5 years ago
3 Answers
0 Vote Up Vote Down
Raju answered 5 years ago

For the same working voltage, the potential stress on the insulation is less than in case of DC system than that AC system. Therefore , a DC line requires less insulation.
In other words A DC System has a less potential stress over AC system for same Voltage level and power rating, this is why AC needs more insulation than DC system?Why AC needs more insulation than DC for the Same Working Voltage Level?
Let’s explain in detail..
When we talk about DC, let say 220 Volt DC, it means the maximum value (peak value) of the voltage is 220V, but when we talk about 220 Volt AC (As in our home distribution system = single phase AC Supply = 220 V AC or 110V AC in the US), then it is basically 220 RMS (Root Mean Square = ?2) value, i.e. it is the RMS value of 220V AC.
The peak value of AC voltage is equal to ?2xVRMS = 1.414 x VRMS (where ?2 = 1.414)
In other words. The peak value of AC voltage = VRMS / 0.707

0 Vote Up Vote Down
Power answered 5 years ago

  For the same working voltage, the potential stress on the insulation is less than in case of DC system than that AC system. Therefore , a DC line requires less insulation.
 
  In other words A DC System has a less potential stress over AC system for same Voltage level and power rating, this is why AC needs more insulation than DC system

0 Vote Up Vote Down
Santu answered 5 years ago

Because DC is a level voltage without peaks.
AC is a sine wave where RMS is the “average” (Root Mean Square) and the top of the sine wave is well above the RMS and can break through/jump over a lower insulation level/gap.

Primary Sidebar

Related Questions

  • What is difference between AC and DC resistance of a conductor? asked by admin
  • What is the frequency of DC Voltage? asked by
  • Why the capacitors works on ac only? asked by
  • How to convert KVA to KW? asked by

INTERVIEW QUESTIONS

MCQ or Objective





Recommended Post

Electrical Engineering Interview Questions

MCQs on Transformer

Differences between synchronous motor and induction motor?

MCQs on Electrical Circuit Theory

MCQs on Induction Motor

Categories

  • Electrical Articles (19)
  • Electrical MCQ (75)
  • Electrical Questions (11)
  • Interviews Questions (7)
  • IQ Test (1)
  • Uncategorized (12)

Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@2017-2022