Answer / arun 9865576777

Transformer Commissioning Work


Preliminary Test

1. HT Switchgear End

 HT BKR IR Value

Open Condition Closed
Condition
R-RI= R-Y=
R-E=
Y-YI= Y-B=
Y-E=
B-BI= B-R=
B-E=


2. Transformer end

 TRF IR Value
Note: - Neutral earth should be open
LV line PT fuse& earth link open
15sec 60sec 600sec PI
HV-E
LV-E
HV-LV
After the above tests put back neutral earth line pt fuse&
earth link Connection properly.



3. LV Panel End

 LT BKR IR Value

Open Condition
Closed Condition
R-RI= R-Y=
R-E=
Y-YI= Y-B=
Y-E=
B-BI= B-R=
B-E=


Preliminary Checks

1. HT Switchgear End

 Check Relay Setting
 Check Tightness Of CT TB
 HT Cable Connection
 Interlock Trial
 Stability Check
 BKR Trial In Test Mode
 Check Fuse
 Check MTR Operation
 Reset The All Relay
 Check Control Supply
 Reset Max Value On Relay

2. Transformer End

 TRF Body Earth
 TRF Neutral Earth
 HT Cable Connection
 Check Tightness Of CT TB
 Check WTI,OTI (or) Door Inter Lock Trial
 Check OTI,WTI Setting
 LV Side Flexible Tightness
 Check Marshalling Box Control Supply



3. LV Panel End

 Check Relay Setting
 Check Tightness Of CT TB
 LV Side Flexible Tightness
 Check Line PT Fuse
 BKR Trial In Test Mode
 Check Control Fuse
 Check MTR Operation
 Check U/V Trip Throw Line PT
 Reset The All Relay
 Check Control Supply

Before Charging
 Line PT should be in service
 LV BKR should be open condition
After TRF Charging
 Note Down Electrical Parameter In HT Side & LT Side
 Phase Sequence In LT Side

Differentiate between low pass, high pass and band pass filter?

0 Answers  

---

why do we have spikes enough to burn electronic boards, when generators are not grounded

0 Answers  

---

What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection

0 Answers   ABB,

---

What is the difference between RMS and average value

5 Answers   CEERI, HPCL,

---

testing of transformer

1 Answers   Vijai Electricals,

---

---

how much current does 3ph. 10 hp ac motor draw.

8 Answers  

---

what is the difference between torque induced and torque load?compare them with respect to dc motor?

0 Answers  

---

I need the list of Universities who have summer intake for BS degree in Electrical Engineering.?

0 Answers  

---

if we are using ACB in a panel the how much clearance do we need in panel room.

2 Answers  

---

at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

0 Answers   Ebrahim Textile, Siemens,

---

Why 60Hz motor taking more current on load in 50Hz power supply?

1 Answers  

---

what is auto re-closer?

0 Answers  

---