Answer / shashi suman

OVERLOAD RELAY WORKS ON THERMAL PRINCIPLE AS IT CONSIST OF
BIMETALLIC STRIP INSIDE.WHEN THERE IS PHASE FAILURE CURRENT
OF TWO PHASE WILL PASS THRU THE THIRD PHASE WHICH IN TURN
WILL CARRY TWICE THE CURRENT OF HEALTHY PHASE.IF THE MOTOR
IS UNDERLOADED THEN EVEN TWICE OF THE CURRENT OF HEALTHY
PHASE WILL BE LESS THAN OVERLAOD RELAY RATING.AND SO TH
MOTOR WILL CONTINUE TO RUN IN CASE OF PHASE
FAILURE.THEREFORE FOR IMMEDIATE TRIPPING OF MOTOR PHASE
FAILURE RELAY IS PROVIDED WHICH MAY BE BASED ON CURRENT OR
VOLTAGE.

How will you Protect aeroplanes and Ships from Lightining?

3 Answers   Parco,

---

why v/f ratio to maintain constant in speed control of induction motor?

3 Answers  

---

ct connection of energy meter

1 Answers  

---

when we given 3 phase supply to ups system, but out put comes with 3 phase + neutral how it possible? pls explain.

3 Answers   Enzen, Juniper Networks,

---

What is difference between Electrical & Electronic Device? 

7 Answers   AZ Engineering, Vodafone,

---

what is the meaning of Ring Mean Unit in a substation or trasformer also tell me its oerpuse?

4 Answers   NPTC, NTPC,

---

When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt

0 Answers   BMRCL,

---

sir, is there any ratio,this much of A.C volt is equal to D.C voltage

3 Answers  

---

what u meant of power plant?

5 Answers  

---

why we can choose induction machine in wind mill? why can`t use synchronous machine?

3 Answers  

---

while grounding the galvenized metallic structures is it necessary to remove the galvenization at the point of contact? Or other wise is the galvenizatio a good conductor?

1 Answers  

---

i have installed my solar site of 6.7kw and is working perfectly , can somebody tell me that how can i measure my solar irradiation kw/day/sq m ?

3 Answers  

---