Busbar Protection.ppt

7/31/2019 Busbar Protection.ppt

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A MINI-PROJECT REPORTON

BUSBAR PROTECTIONIs submitted to

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY ANANTAPUR,

ANANTAPUR

Under the guidance ofMr. SHAIK MOHAMMED RAFI, M.E ,

Assistant Professor,Department of E.E.E.,

SIDDHARTHA INSTITUTE OF SCIENCE & TECHNOLOGY,PUTTUR.(An ISO 9001:2000 Certificate Institution)

(Approved by A.I.C.T.E. New Delhi & Affiliated to J.N.T.U.A., Anantapur)01/08/2011 Dept. of EEE,SISTK


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OBJECTIVE :

o BUSBAR faults are rare but if theyoccur there can be interruption of

supply, considerable damage and loss

to the equipment, property and people

working around.

o Hence busbar protection must be fast

in operation, stable and reliable.

o This project deals with busbararrangements, protection schemes

used in 220KV substation

RENIGUNTA.01/08/2011 Dept. of EEE,SISTK


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BUSBARS :

Conductors to which a number ofcircuits are connected.

The material used should have low

resistivity,higher softening temperature,

good mechanical properties and low

cost.

Supported on post or strain Insulators.

The flexible bus is held at higher levelabove the various sub-station

Equipment.

01/08/2011 Dept. of EEE,SISTK


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BUSBAR ARRANGEMENTS :

SINGLE BUSBAR :



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WITH SECTIONALIZING BREAKER :



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DOUBLE MAIN BUS &TRANSFER BUS SYSTEM :



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DOUBLE BUS WITHSECTIONALIZE SYSTEM :



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ONE AND A HALF BREAKERARRANGEMENT :



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MESH ARRANGEMENT :



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Busbar faults are generally single line to ground faults,

phase to phase faults

The main causes for a fault in a busbar :Failure of support insulator resulting in earth fault.

Flashover across support insulator during over voltages.

Heavily polluted insulator causing flashover.Failure of connected equipment to the busbar.

Various environmental conditions.



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Depending upon the rating of the machine, its

location, relative importance, probability of faults

and abnormal conditions etc., each power system

component is covered by a protective zone.

Differential protection

High impedance protection

Low impedance protection



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SATURATION CURVE :



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The problem of

CT saturation

is eliminated at

its source by

air-core CTs

called linearcouplers.



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LBB: Local Breaker Backup Relay.

BFR: Breaker Failure Relay.

CBF: Circuit Breaker Failure Relay.

LOCAL BREAKER BACKUP PROTECTION

Remote back-up

Local back-up

Relay back-up

Breaker back-up



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MAINPROTECTIONOPERATED

YES

YES

TRIPMAIN

BREAKER

INITIATEBFR

WAIT FORFAULT

CLEARENCE

AND

FAULTCLEARED

YES

NO

RESETBREAKERFAILURESCHEME

TRIPBACK-UP/Adjacent

BREAKERS

RETRIP



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BUSBAR PROTECTION SCHEME AT220KV SUBSTATION RENIGUNTA :



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S.no Particulars Ratio available Ratio AdoptedFor Buabar

1 220KV manubolufeeders 1&2

800/1-1-1-1-1A 800/1-1A2

220KV mahadeva

mangalam feeders 1&2 800/1-1-1-1-1A 800/1-1A3 220KV c.k.palli 800/1-1-1-1-1A 800/1-1A4 220Kv koduru feeder 800/1-1-1-1-1A 800/1-1A5 220KV bus coupler 800/1-1-1-1-1A 800/1-1A6 HV breakers of

100MVA, 220/132KV

transformers 1, 2 &3

300/1-0.66-.375-.375-1A 300/0.375-0.375A7 Bus-1 C.T 800/1-1-1-1-1A 800/1A8 Bus-2 C.T 800/1-1-1-1-1A 800/1A



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The existing PBDCC scheme at 220 KV SS Reniguntamainly comprises of 3 panels.

CT Switching panel

Busbar protection panel

Auxiliary relay panel

The full form ofPBDCC/PBDCB is as follows:

P- Protection

B- BusbarD- Differential principle

C- Check zone

B/C- No additional function/additional function (bus

supervision relay)01/08/2011 Dept. of EEE,SISTK


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S.no Particulars Ratio available Ratio AdoptedFor Buabar

1 220KV manubolufeeders 1&2

800/1-1-1-1-1A 800/1-1A

2 220KV mahadevamangalam feeders 1&2 800/1-1-1-1-1A 800/1-1A

3 220KV c.k.palli 800/1-1-1-1-1A 800/1-1A4 220Kv koduru feeder 800/1-1-1-1-1A 800/1-1A5 220KV bus coupler 800/1-1-1-1-1A 800/1-1A6 HV breakers of 100MVA,

220/132KV

transformers 1, 2 &3

300/1-0.66-.375-.375-1A300/0.375-0.375A

7 Bus-1 C.T 800/1-1-1-1-1A 800/1A8

Bus-2 C.T

800/1-1-1-1-1A 800/1A01/08/2011 Dept. of EEE,SISTK


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Busbar has a great importance in the power system and

its protection is essential for smooth stabilised and saferoperation of the network.

In this project,a basic understanding of bus arrangements

and types of busbar protection schemes and the studyextended to BUSBAR PROTECTION IN 220KV SS

RENIGUNTA.

The busbar arrangement used in 220KV SS RENIGUNTAis double bus arrangement. Even we made some relays

testing related to busbar protection i.e. bus supervision

relay test and differential relay test.



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A course in Power systems - J.B.GUPTA

Switch Gear Protection and Power System - SUNIL S. RAOTechnical Reference Book - APTRANSCO

Power Systems Protection and Switchgear

- BADRI RAM ,D. N. VISHWAKARMA

www.electricity-today.com/et/Novdec96/busbar.html

www.ee.iitb.ac.in/~npsc2008/NPSC_CD/Data/Oral/CIC2/p110.html

www.abb.com/product/us/9AAC30301050.aspx

www.fecime.org/referencias/npag/chap15-232-253.html01/08/2011 Dept. of EEE,SISTK
http://www.electricity-today.com/et/Novdec96/busbar.htmlhttp://www.ee.iitb.ac.in/~npsc2008/NPSC_CD/Data/Oral/CIC2/p110.htmlhttp://www.abb.com/product/us/9AAC30301050.aspxhttp://www.abb.com/product/us/9AAC30301050.aspxhttp://www.abb.com/product/us/9AAC30301050.aspxhttp://www.ee.iitb.ac.in/~npsc2008/NPSC_CD/Data/Oral/CIC2/p110.htmlhttp://www.ee.iitb.ac.in/~npsc2008/NPSC_CD/Data/Oral/CIC2/p110.htmlhttp://www.electricity-today.com/et/Novdec96/busbar.htmlhttp://www.electricity-today.com/et/Novdec96/busbar.htmlhttp://www.electricity-today.com/et/Novdec96/busbar.htmlhttp://www.electricity-today.com/et/Novdec96/busbar.html


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Documents

Busbar Protection.ppt