Answer / k.prakashchandra

The overload relay may be set at 110-120 % of the rated
current of the motor

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 is the diff between VCB & ABCB breaker in substaions? explain the operating priciples of VCB & ABCB

1 Answers  

---

what will happen if there is a voltage leakage or current leakage in an electrical train

0 Answers  

---

We have given to 3phase supply to ups system & how can coming netural

0 Answers  

---

how does directional relay work incase of ac ?

0 Answers  

---

does buccholz in a transformer use batteries

2 Answers  

---

How the output,losses and temperature of machines varies with linear dimension?

1 Answers  

---

How much UG cable size should i use so as to accomodate a ground + 2floors house. A 1.5ton AC & geysers(2) in each floor with lightings

2 Answers  

---

which frequency is to be selected for measuring earth resistivity

1 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

---

How to PLC give the command to electrical

1 Answers  

---

i want to model paper for section engg.

0 Answers   Infosys, RRB,

---

what is meant by bus bar and outgoing/incoming breaker in an electrical/electronic circuit

3 Answers  

---