Answer Posted / vinod g

In Restricted earth fault protection Three phase CT is
parralleling (shorting all S1 andshorting all S2 together)
and paralleel conection with Neutral Relay and CT. IN
Healthy conditon current in all the three phase will be
balanced and summation will be zero. During earth fault out
side CT area summation of phase CT currents and Neutral CT
zero, so relay will not pick up. When earth fault inside
the transformer the current in the CT will differ and Relay
will pick and trip the tranformer breaker,so it is clear
that REF is for Transformer Winding protection and Bushing
CT is normally using for phase CT

If Neutral Grounding Resistor (GR) failed/shorted. Is it repairable.

1685

---

how to wiring it with contactor and timer together

1915

---

how many types control panel of a 132/33 kv substation

2696

---

how to calculate the Neutral transformer impedance?

2541

---

EXPLAIN WHY THE SURGE CURRENT RATING OF AN MCCB OR CIRCUIT BREAKER DECREASES WITH INCREASE IN THE RATING OF MCCB OR CIRCUIT BREAKER.

2068

---

define digital electronic

2042

---

What is the Difference between Ac Drives and Dc Drives? According to application, speed, Torque, cost, Reliability, Construction, Motor etc... Thankyou !!!

2251

---

What are PLC leader logic program method

1822

---

Explain and give me an example of a time when you had to explain some new procedures to your co-workers for quality service delivery, how did you go about it?

2037

---

suri transmission

4796

---

explain with diagram how to protect transformers and substations from over current with help of CT's?

2013

---

What is the general system requirement of alternator?

1902

---

Power Factor Correction Panel (Manual & Automatic)

2290

---

How to dimensioning SDCCH, LAPD and CS7 signaling on GSM?

2741

---

Explain the operation principle, advantages and disadvantages of the following converters: a) A 12 pulse converter b) A Switch-mode inverter c) A thyristor inverter

2125

---