Answer / ravikumar josyula

AMF Panel: is Auto Mains failure panel. When the EB power
goes off with a time delay signal will go to DG self
starter to start the DG. And when the EB power
resumes,after definite time delay stop signal goes to DG
and EB supply contactor will become ON.For a fraction of
time power will not be there for the utilities.

In synchronization, there is no outage of supply to the
utilities.When the incoming genset is to synchrinize with
the existing set,we've to match the magnitude of the
voltage, phase angle and the frequency and then only we've
to switch on the incoming set's breaker.

Answer / bhupinder singh verma

  AMF Panel: is Auto Mains failure panel. When the EB power goes off with a time delay signal will go to DG self 
starter to start the DG. And when the EB power 
resumes,after definite time delay stop signal goes to DG 
and EB supply contactor will become ON.For a fraction of 
time power will not be there for the utilities.



In synchronization OF DG SETS, When the EB power goes off with a time delay signal will go to DG self starter to start the DG AND WHEN THE LOAD REACH THE 90% CAPACITY OF THE DG-1 THEN THE DG-2 WILL START AND THE DG-2 gen-set is to synchronize with the existing DG-1 THEN ,we've to match the magnitude of the voltage, phase angle and the frequency and then only we've to switch on the incoming set's breaker. THATS WHY THE OUT PUT SUPPLY SUPPLY OF BOTH DG SET WILL RUN ON THE SAME COMMON BUS BARS ( MEANS- DG-5OO KVA / DG-2 380 KVA THEN THE TOTAL LOAD IS 780 KVA ON COMMON BUS BARS ) IN THIS WAY WE CAN SYN. ELECTRICAL CITY BOARD POWER AND DG POWER ALSO.  

Answer / ajith kumar.s

1 st answer is right
but synchronization of palel is deffernt types one is rpm
synchronizing other is voltage and phase sequency this
uesed dark lamp or synchrocape used,

how to calc. current for 5MVAR,50hz,33kv

1 Answers  

---

what is meant by mimic diagram ?where it is used ?plz explain briefly

2 Answers  

---

what is difference b/w squirrel cage rotor and wound rotor

2 Answers   Bhel, Electrical,

---

we all know that in transformer, voltage and current are inversely related i.e. Vp/Vs= Is/Ip....so in standard CT..we have a ratio of 200/5...that means our voltage should increase by ratio of 40..althoug that is not the case...because that requires high insulation level.and pratically not feasible......can anybody clarify my ques.......thanx

2 Answers  

---

what's the use of cvt and wave trap in 400kv switch yard.......

5 Answers  

---

What is the difference between surge arrestor and surge capacitor?

2 Answers   Shreem Electric Ltd,

---

plz send me the placement interview question and answers of whizchip(technical and apttitude)..i have an interview in next.

0 Answers  

---

Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

0 Answers   Bhel,

---

what will be the efficiency off x'mer during no load test and during short circuit test

1 Answers   GPSC Gujarat Public Service Commission,

---

Why should be the frequency 50 hz 60hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50 hz 60hz?

0 Answers  

---

My self munna.I had completed diploma from mechanical can I join facility and maintanance companys

1 Answers  

---

i have total 8 dg sets for synchronizing and 2 buscoupler,1 sectoin dg no 1,2,3,and 2 sectoin dg no 4,5,6,and last section dg no 7,8 ....if buscupler no 1 and 2 is off mode ..than dg no 1,2,3,will synchroniz of another dg sets?

0 Answers   Crown Buildtech,

---