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1/8

DBN 1

Bus differential

protection

Fundamental ideas

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2/8

DBN 2

I2p

I3p

I1p

I4p

I5p

Load condition

p3Ip5Ip4Ip2Ip1I

0= pIi

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3/8

DBN 3

I2p

I3p

I1p

I4p

I5p

External fault

IfaultpIpIpIpIpI ==+++ 54321

0= pIiIfault

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4/8

DBN 4

I2p

I3p

I1p

I4p

I5p

Internal fault

IfaultpIpIpIpIpI =++++ 54321

IfpIi =

Ifault

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5/8DBN 5

External fault with saturation

I1p

I5p

IfaultpIpI == 51

0= pIi

Ifault

I1r

I1m0

I5m0

I5r

I1s

I5s

r5Im5Is5I

s1Ir1I

0555151 =+=+== mImIsIsIrIrIsIIdiff i

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6/8DBN 6

Internal fault

I1p

I5p

IfaultpIpI =+ 51

0 pIi

Ifault

I1r

I1m0

I5m

0

I5r

I1s

I5s

sIrI 55 =

s1Ir1I

051 +== rIrIsIIdiff i

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7/8DBN

Im

!m

RsIrVm

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8/8DBN "

#han$s %ou for %our attention&