Answer / venmuk

c

WHY THE +VE POLARITY OF 48V DC POWER SUPPLY IS USUALLY GROUNDED?

1 Answers   Tulip,

---

what is ps impedance test

0 Answers  

---

how you can select circuit breaker for 2000kva transformer?

9 Answers   TATA,

---

why the electric train touches only one conductor n where is the neutral n it will be running 3-phase or 1-phase?

3 Answers  

---

I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase, before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

---

in transformers for ex. 100mva and 400kv the secondary current is about 420 amps but for selection of bushing the capacity of selected bushing is 2000A why there is such big difference ?

2 Answers   ABB,

---

What happens if ac is applied to dc systems and vice versa?

5 Answers  

---

What is disadvanage if power factor goes to in leading..?

0 Answers  

---

How to calculate the Harmonics losses in terms of cost/unit.

0 Answers  

---

what is ground fault in ACB?

0 Answers  

---

1. what is the power factor and whatis his losses 2. what is the working procedure of 51RNB AND 87 relay

3 Answers   ABB,

---

RATING OF LIGHTENING ARRESTER FOR 11 KV LINE IS 9 KV is ok ,but haw to calculate the KA rating?

0 Answers  

---