Consider a station (1 1/2 schemes ) feeds with two lines
1. Line -1 dead for maintenance work
2.In Line -2 there is a Zone -1 fault
Now The Auto reclose should block because already one Line -1 is out and may be fault exist in Line -2 now the condition is station totally dead. So the station should not energized by Line-2 Auto reclose with fault line.
If the Power Transformer connected with same cross bay then it should be energized with Bus voltage. If Bus side Transformer CB in open condition then the A/R operation should block for the line.Otherwise the Transformer also energized with fault line.
Wednesday, July 18, 2012
WARNING !!!!
ITS CAME TO MY MAIL
" MUST READ and Share" " MUST READ and Share" " MUST READ and Share"Can ELECTRICITY pass through Flash light of the Digital camera to your body??? Yes it is 100% true..!This is a true incidence reported of a boy aged 19, who was studying in 1st year of engineering, who died in Keshvani Hospital, Mumbai. He was admitted in the Hospital as a burned patient. Reason ??????... This boy had gone to Amravati (a place located in State of Maharashtra ) on a study tour, on their return they were waiting at the railway station to catch the train. Many of them started taking pictures of their friends using "Mobile Phones" and / or "Digital Camera". One of them complained that, he was unable to capture the full group of friends in one frame in the Digicam.This boy moved away to a distance to get the whole group.He failed to notice that at an angle above his head, 40,000 volts electrical line was passing through.As soon as he clicked the digital camera? 40,000 volt current passed through the camera flash light to his camera and then from his camera to his fingers & to his body. All this happened within a fraction of a second. His body was half burned.They arranged for an ambulance & his burned body was brought to Keshavani Hospital, Mumbai.For one & half days or so he was conscious & talking. Doctors did not have much hopes as there was a lot of complex issues in his body. He passed away later.Now how many of us are aware about these technical threats & dangers? Even if we are, how many of us are adhering??Now should we call ourselves as educated and knowledgeable people?▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼* Please avoid mobile phones on petrol outlets.* Please avoid talking on mobile phones while driving.* Change that "Chalta Hai Yaar Attitude".* Please avoid talking on mobile phones while kept in charging mode without disconnecting from wall socket.* Please do not keep mobile phones on your bed while charging and / on wooden furniture.* Avoid using mobile phones / Digital cameras near high voltage electrical lines like in railway stations and avoid using flash.
" MUST READ and Share" " MUST READ and Share" " MUST READ and Share"Can ELECTRICITY pass through Flash light of the Digital camera to your body??? Yes it is 100% true..!This is a true incidence reported of a boy aged 19, who was studying in 1st year of engineering, who died in Keshvani Hospital, Mumbai. He was admitted in the Hospital as a burned patient. Reason ??????... This boy had gone to Amravati (a place located in State of Maharashtra ) on a study tour, on their return they were waiting at the railway station to catch the train. Many of them started taking pictures of their friends using "Mobile Phones" and / or "Digital Camera". One of them complained that, he was unable to capture the full group of friends in one frame in the Digicam.This boy moved away to a distance to get the whole group.He failed to notice that at an angle above his head, 40,000 volts electrical line was passing through.As soon as he clicked the digital camera? 40,000 volt current passed through the camera flash light to his camera and then from his camera to his fingers & to his body. All this happened within a fraction of a second. His body was half burned.They arranged for an ambulance & his burned body was brought to Keshavani Hospital, Mumbai.For one & half days or so he was conscious & talking. Doctors did not have much hopes as there was a lot of complex issues in his body. He passed away later.Now how many of us are aware about these technical threats & dangers? Even if we are, how many of us are adhering??Now should we call ourselves as educated and knowledgeable people?▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼* Please avoid mobile phones on petrol outlets.* Please avoid talking on mobile phones while driving.* Change that "Chalta Hai Yaar Attitude".* Please avoid talking on mobile phones while kept in charging mode without disconnecting from wall socket.* Please do not keep mobile phones on your bed while charging and / on wooden furniture.* Avoid using mobile phones / Digital cameras near high voltage electrical lines like in railway stations and avoid using flash.
Sunday, July 15, 2012
TRANSFORMER VECTOR GROUP
The vector group test is importent test in the transformer testing
The Test procedure
1. Connect the HV side "R" phase with LV side " R" phase. ( No need for Auto transformer )
2. Apply the 3 Phase voltage (380v) on HV side.
3. Measure the voltages in various combination on both side of the transformer ( HV- LV ).
4. For each vector group need diffrent type of voltage combination to conform the vector group ( refer drawings ).
For more information
Thursday, June 28, 2012
Jubail -2 Sub-3 Energization
This station successfully energization without any small problem 25 & 26 on June 2012.
Really i got good confident on the work and well experience.
We got good team during commissioning and its lead us to success.
Note:-
The total bay portion of Line and transformer feeders are protected by there own relays
The spare feeders are protected by only busbar protection and it will cover up to CB line side CT.
During first time charging we need to protect the spare feeders up to Air bushing.
Generally two methods are following to protect the spare feeders.
1. If short the CB line side Busbar CT then busbar protection will cover upto Air bushing.
2. Change the other end (Existing end ) protection relay Zone 2,3 time settings to zero and it will cover upto New station spare feeder air bushing.
Monday, May 7, 2012
BUSBAR & BF PROTECTION TESTING
The testings in Busbar protection low impedance relays DOWNLOAD
The testings in Beaker Failure protection relays DOWNLOAD
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