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A three phase load, around 4 km away from the 11/0.433KV distribution transformer (Neutral of Transformer is solidily earthed) and consisting of mainly very costly and sensitive electronic equipments is giving trouble due to high voltage difference between neutral and body earth. Whether this problem can addressed by connecting neutral at the load point solidly to earth?
3 6262On load tap changer (OLTC) explode? Transformer Vector group: Ynd11 Rated Power: 353MVA Rated Current: 693A Voltage:294/20KV OLTC Type: T III Y1000 110/c 12193w Max Operation Current: 295A Step Voltage: 550V Arrangement in Tx windings: Y Connection Problem: Damage of Unit 1 Generator Transformer On Load Tap Changer (OLTC) Description of Incident: 9.00 a.m. :- Generator No Load test on excitation system started 10.30 a.m :- Carried out AVR change over test 11.30 a.m :- Preparation for Generator Manual Synchronizing test 12.00 a.m :- Manual Synshronizing test started. Observed incoming generator voltage higher than running voltage. CECR operator operated Generator Transformer OLTC to bring down the incoming generator voltage 12.03 a.m :-Generator Transformer abnormal alarm operated at Gen.Control Desk (CECR) CECR operater at Generator transformer bay informed that the transformer oil splashed out from OLTC. CECR operater informed that he heard explosion inside OLTC. Observed Oil level & Oil Flow alaram operated at Tranformer local annunciator. 12.05 am :- CECR operator 'Open Gen Field Breaker” 12.10 a.m. :- Elec1 team inspected the OLTC and found the OLTC rupture disk was broken and oil spilled at OLTC area. - Elec1 found the OLTC top cover bulging. Do anyone know why and possibility cause happen in this OLTC.
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TATA,
3164Is it posssible to obtain the higher speed(3000rpm) for adiferentiallly cascaded induction motors(with 8 and 6 poles)
3 4885How to calibrate the magnetic flow meter and how to correct the flow if it is showing more flow.
5 28067In electronic board one fuse(rating 230v,100ma)showing 2.5 ohms with multimeter,then the fuse is healthy or not.
4 76551.Heat Treatment Process HRC Stands for 2.Material OHNS Stands for
ABCO, College School Exams Tests, Hindustan Motors, Shree Pressings,
10 41280i need previous 5 years solved q&a for rrb chennai section engg(mech) anybody if you know please atleast provide me the link or if u could send me it to my mail id karthick.silence@gmail.com
2735
Is fan out of ECL logic family is high?give reason for yes or no?
How do you determine what suction pressure should be in r22 air conditioning compressors suction line?
What is the difference between tube and pipe?
How to calculate steel for beam slab and column
What is the range of the stator resistance of 3 phase induction motor?
howw can we transmit the call of gsm?
what is the clear formula to calculate cable size for a load
what happen when diesel genset supply connect to main supply
how clculate excavated or backfilling quantity by simpson's rule
earth also having a gravitational force (magnetic field of north and south)but it attracts any object compare to this theartifical magnetic cant perform same as earth why?
what is punching force required for embossing of depth 3.5mm and diameter 58mm
What does f.o.f. Stand for in piping design?
What is routh hurwitz stability criterion?
What are some typical applications for glass-lined reactors?
If VFD is On but no starting commond on it. so how many outpout voltages of VFD
