Answer / thowsif_emerson

It consists of an iron armature fastened to a balance beam.
Under normal operating Conditions, the current through
the relay coil is such that the beam is held in the
horizontal position by the spring. When a fault occurs,
the current through the relay coil becomes greater
than the pick up value and the beam is attracted
to close the trip circuit. This causes the opening of
the circuit breaker to isolate the faulty circuit..

Log on to:-
http://electricalandelectronics.org/2008/10/30/electromagnet
ic-attraction-relays/

what is the difference between Current transformer & Capacitive voltage transformer

2 Answers   ABB,

---

what is the principle of generator, motor, and transformer and explain the definiton of flemings left hand rule , right hand rule and ohms law

2 Answers   NFCL,

---

Scott connection is used for A 3-phase to 2-phase conversion B to achieve higher effciency C to save copper D to reduce harmonics

0 Answers  

---

1.Difference between vcb and Acb and partes. 2.Difference between STS and ATS.

2 Answers  

---

One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

---

what are factors to be consider to design a HT & LT motor?

1 Answers  

---

i need of the bhel question papers along with answers and also give some website names for the downloading question (electrical and electronics engg question)please help me....

0 Answers  

---

What are the types of lighning arrestor protection system? how to choose that according to load?

2 Answers   SPL,

---

what is the difference between the diode and the rectifier

17 Answers   Avalon, L&T, Mahacol Trexim,

---

How to select cable the size, what is the parameters use and what is the formulas use for this cable size calculation?

0 Answers  

---

HOW CAN I GET 5CORE HO7 CABLE SIZE IF I HAVE 1800A?

0 Answers  

---

what is the eight bit unit?

0 Answers  

---