Answer / k.prakashchandra

All the tr lines should be provided with EF protection.11
and 33 KV lines are provided with 2 OC and 1 EF relays or 3
OCR and 1 EFR.The unbalanced current passes through the EFR
which is usually set at 20% of OCR setting.The EFR is
connected between star points of CT's and relays. For
higher voltages distance relays are provided with OCR and
EFR as back up protection.If the line breaks i.e.a
conductor opens out without touching earth .The distance
relay does not act as there is no heavy current.The EFR
will trip only if the unbalanced current exceeds the set
value .Hence there will not be any tripping if the line is
not loaded sufficiently. OCR=over current relay, EFR =earth
fault relay

What is the difference between MCCB & ACB Where it can be used

5 Answers  

---

What are the reasons for AVR failure in LT DGsets ?

2 Answers  

---

Is it legal of using 3 phase motors in 2 phase in Tamilnadu?

2 Answers  

---

in 220 kv substation,what is the mean of avr voltage reading? means at oltc temp. 36 the avr voltage was 109v.so what the mean of 109v

1 Answers  

---

i purchase a microwave which is 50/60Hz but Current Setting 60Hz in my country we usually use 50hz, can i use AVR to solve my problem?

2 Answers   Samsung,

---

Explain marx circuit.

0 Answers  

---

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

---

i have a Connected Load of 280KW and Maximum Demand of 224KW to one of SMDB under design with me. which criteria should i consider to design panel and main cables connected Load or Maximum Demand 1)Breaker rating 2)Panel Busbar rating 2)Incommer cable sizing (ignore Voltage drop)

1 Answers  

---

Sir, I m 3rd year student 4m DCE and want to do internship in siemens or l&t or any other mnc related to electrical engineering. please tell me the procedure 4 same and oblige me

0 Answers  

---

V.c.b and a.c.b difference

4 Answers  

---

Why are you like to join it job as a electrical engineering student?

4 Answers   Bhushan Power Steel,

---

Which types of gate insttaled in static switch. Please give me answer.

0 Answers   cpgn,

---