AUTO TRANSFORMER 86LOR TRIP ARRANGEMENT

The Transformer protection tripping can grouped as follows

1. SET-1 Main Protection

The main protection can be divided in to two groups (CB TC-1 Tripping)

a. LOR 86-1 ( Neumarical relays protection)
1.Differential protection (86T)
2.REF protection (87 REF)
3.HV side Over Flux protection (24 - HV/T)
b. LOR 86-3 ( Mechanical protection)
1.Buchhloz Relay trip - Main tank (63 T)
2.WindingTemp High Trip - Serious Winding Main Tank (49 W-TS)
3.Winding Temp High Trip - Common Winding Main Tank ( 49W-TC)
4.Winding Temp High Trip - Tertiary Winding ( 49 W-TT)
5.Buchhloz Relay trip - OLTC (62-OLTC)
6.Buchhloz Relay Trip - Grounding Transformer (63- GT)

2. SET-2 Back up Protection

The back up protection can be divided in to two groups (CB TC-2 Tripping)

a. LOR 86-2 ( Numerical relays protection)

1.HV & MV side backup 3 phase & ground fault inverse time & inst O/C
relay unit and function (67HV & 67NHV and 67MV & 67NMV)
2.HV side Over Flux protection (24 - HV/T)
3. Neutral backup O/C relay ( 51 G-T)
4.Tertiary winding O/C relay ( 51TW/HS & 51 TW/LS)

b. LOR 86-4 ( Mechanical protection)

1.Pressure Relief - trip-main tank (63PR-T)
2.Oil Tem very high trip - main tank ( 26-T)
3.Oil Tem very high trip OLTC ( If any) (26- OLTC)
4.Pressure relief OLTC tank - (63-OLTC)
5.Oil pressure relay Main tank (63-T)
6.Pressure relief Trip grounding transformer ( 63 - PR-GT)

TEST FORMATS

1. AUX RELAY

2.MAIN RELAY

3.EQUIPMENTS

TRANSFORMER OIL LEVEL vs TEMPERATURE CURVE

This comman for all Power Transformers

RELAY SOFTWARES USED IN SUB-3

1. RED 670 - LINE PRO - ABB
PCM 600 - 2.3
2. RET 670 - TR PRO - ABB
PCM 600 - 2.3
3. REB 500 - BB PRO - ABB
REB WIN - 7.5
4 . 7SS52 - BB PRO- SIEMENS
DIGSI - 4.83
5.MICOM - AREVA
MICOM S1 STUDIO - 3.4
6. SEL METER - ENERGY METER - SEL
SEL SOFTWARE

AUTO RECLOSE

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.

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.

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

http://electricalnotes.wordpress.com/2012/05/23/vector-group-of-transformer/