Answer / meenakshi

Differential relay is one that operates when the phasor
difference of two or more similar electrical quantities
exceed a predetermined value. Thus a current differential
relay is one that compares the current entering a section
of the system with current leaving the section.Under normal
operating conditions, the two currents are equal but as
soon as fault occurs, this condition no longer applies. The
difference between the incoming and outgoing currents is
arranged to flow through relay operating coil. If this
difference is equal to or grater than the pick up value the
relay will operate and open the circuit breaker and isolate
the faulty section.
mainly used in two winding transformers

For a DY11 lighting Transformer on primary side whee to connect fourth lead? from nuetral or from ground?

3 Answers   Sabic,

---

What is breather? why we use it ?

3 Answers  

---

why using eleven's multiple for substations?

2 Answers  

---

if voltage is not builed up in small generator what will be the reason?

7 Answers   century,

---

how can we change the rotating direction of single phase AC induction motors?

12 Answers   Heubach Colour, L&T, MNM Jain Engineering College,

---

---

my question is how to answer the question "you are from b.tech eee background and why do you want to go for banking

0 Answers  

---

how to enter inverter parameter? without manaual?

0 Answers   Essar,

---

why transformer are rated in kva.

5 Answers   Dalkia, Nalco,

---

what happen when increase or decrease size of lamp,light.glass.

0 Answers  

---

Hi, We facing one similar problem in our computers i.e we are newly constructed our design department after that shifted our computers but our computer desktop screen is vibrating. we are conducted our electrical maintainance person he told that is UPS problem, then we changed the UPS also again we are facing that problem in that room only. then we put lcd monitors that problem is solved. But in other monitors why the computer desktop screen is vibrating please give a suggestion to me. Regards, Raju.N.G

10 Answers  

---

How much current flow in no load condition of a motor?

8 Answers  

---

what is 33 /11kv transformer bdv

8 Answers   NMDC, TPPL,

---