Answer / kiran sule

In any relay Set earth fault to minimum That means If Earth
fault range is 20 to 80 % of secondary current then set it
to 20% . In case of over current calculate rated current
and add 5%for relay & ct error and 5% to over load that
means set it to 110% to full load capacity.
If for 200/1 CT If full load current is 160 that mens 80%
to secondary current of Ct+10% relay CT error and Over load
that means relay ia seted to 180A interms of secondary at
0.9 a that means 90%

Answer / vijay raskar

When earth fault is occured then relay is set at 2.5 times
than rated current.

Answer / erharisheee51

we have to connect earth fault relay through current
transformrs , at the neautral side of the generator and
transformers.

Answer / j.kesavan

POWER CIRCUITE R,Y,B PHASE USING THREE CT ,THIS CT OUT PUT
CONNECT IN OVER CURRENT AND EARTH FAULT RELAY , IF ANY ONE
PHASE TAKE MORE CURRENT OR EARTH FAULT THIS RELAY WILL
TRIP.SETTING THIS RELAY MINIMUM CURRENT,MINIMUM DELAY.

Answer / motilal sahu

WHEN EARTH FAULT OCCURE HIGH CURRENT FLOW THOUGH LINE.

IF THIS CURRENT IS 10-115 TIMES OF FULL LOAD CURRENT THEN
SHOW THAT EARTH FAULT OCCURE
SO SET THE RELAY FOR 10-15TIME OF FULL LOAD CURRENT

what is the principle of switchgear and its function

1 Answers  

---

what is divercity factor?

4 Answers   ABB,

---

why the three phase transformer's star point does not sparks or seperated? while we often see that two phases touches each other it sparks and ocationaly conductor breakes out.

4 Answers  

---

How does the phase sequence controller works, how it identifies the phases? confirm working principle

0 Answers  

---

What is the difference between online ups and offline ups?

44 Answers   Electrical Tech, GMR, Gravity India, HCL, Indus Towers, NIT, Pyramid, Techno Electric and Engineering, UBS,

---

---

How can we increase fuel-power ratio of any DG set?

0 Answers  

---

can u name the different types of motors used in different types of applications?

6 Answers   ABB, Bhel, SBQ,

---

How earth resistance reduses by pouring water coal and salt?

4 Answers  

---

How to calculate the breaker's short circuit current?

1 Answers  

---

Im designing APFCR Panel for 600 KVAR.I need to calculate the full current so that i can choose the capacity of isolator/Breaker.Kindly suggest with formula.

1 Answers  

---

how to convert psi into kilo pascal? what is the suction pressure & discharge pressure of chiller?

1 Answers  

---

What mean by MLTP

0 Answers   Machino,

---