What are the safeties in elevators?what is the use of governor in elevator?

3 Answers   JLL,

---

why r use the wave taper in the substation ?

2 Answers   L&T,

---

Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

---

if 6 earth pit value is 1.5 ohm then what should be the number of earth pit to make the value .8 ohm

0 Answers  

---

how much earthings are provided for 22KV HT Metering Kiosk

1 Answers   GE, Gionee, Knight Frank, TATA, Vacmet,

---

our company have 750 kva oil transformer.still we have facing a problem that is when voltage is 11.5 kv coming from HT side then LT-side voltage is 420v or above at tape 1.please give me best solution to decrease the voltage

4 Answers   Gannon Dunkerley,

---

in 33kv line how much current will be

3 Answers  

---

what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)

0 Answers  

---

What are the causes of eddy current losses?

1 Answers   Schneider,

---

int a,b ; a=b=10 ; if(a>b){ printf ("%d",a)}; no error output is a=10

2 Answers   TCS,

---

how many units (kwh) are there if in one MW?

5 Answers  

---

which connection is safer series or parallel?usually which connection we prefer at home?

5 Answers  

---