Electrical Distribution Automation

7/24/2019 Electrical Distribution Automation

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Copyright © CenterPoint and SEL 2015

Distribution Automation Case Study:

Rapid au!t Dete"tion# $so!ation# andPo%er Restoration &or a Re!iab!e

'nderground Distribution System

David Gomes and Richard ColungaCenterPoint Energy

Payal Gupta and Ashok BalasubramanianSchweitzer Engineering Laboratories, Inc.



• 11,!!"acre master"plannedcommunity in #$ %ouston

suburb o& Cypress, '(• )*pected to serve +1,!!!

single"&amily homes and-,!!! residents



R

RPresently at .!/ o&

pro0ected groth

• 1 &eeder loop 2.3- k45• + radial circuits• + reclosers• ++ pad"mounted sitches

• &ault interrupters• 617 miles o& primary

underground &eeder cable

Pro0ected8

9 to 11 distribution circuits



R

R



(hree)Phase (%o)Line and (%o)Load

Pad)*ounted S%it"h Contents

• + line"side sitches 2motor operable5

• 1 dual"&eeder protection relay

• + load"side &ault interrupters

• + interrupter controllers

• An :;, sitch chamber ith

pressure sensor



Pad)*ounted S%it"h Ser+es System

• 13- <4Athree"phase

industrial load

• 6.! single"phase=RD loops

• 6-! single"phase

pad"mounted =RDtrans&ormers

>ine":ide

:itch 1

>ine":ide

:itch +

>oad":ide

?nterrupter +

>oad":ide

?nterrupter 1

Circuit ?n Circuit @ut



Con+entiona! au!t Lo"ationDete"tion *ethods ,ithout

Distribution Automation









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(raditiona! au!t Lo"ation Pro"ess

• Dispatch sends overhead operations creto the &ield

• @verhead operations cre determines that

&ault is on primary and tells dispatch to callunderground operations

• =nderground operations cre is deployed

♦ 4isually inspects sitches and manholes

♦ @pens line"side sitches



Re)Energi.e toind au!t

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$so!ate au!tedSe"tion



Restore Po%er to

/on&au!tedSe"tions

C!ose

C!ose



Pinpoint the Ea"t au!t Lo"ation



Repair or Rep!a"e au!ted Euipment



Con+entiona! au!t Lo"ation

$s $ne&&i"ient

• 4ery time consuming

• >abor intensive

• Costly

• Detrimental to euipment



$mp!ementing an 'nderground

Distribution Automation System



(he 'DAS -be"ti+e$mpro+e Distribution System Re!iabi!ity

• Reduce outage &reuency

• Reduce outage duration

• <inimie number o& a&&ected customers• Reduce costs associated ith outage

management



(he 'DAS -be"ti+e$n"rease System -perationa! E&&i"ien"y

• Automatic &ault detection and &aulted

one isolation

• Rapid netork recon&iguration &or

distribution system to sel&"heal

• Automatic source trans&er

• Remote monitoring and control



(he 'DAS ComponentsProte"ti+e Re!ays

• Per&orm protection and &ault recording

• Provide inter&ace to control sitches

and reclosers

• Provide =DA: ith data 2analog, binary,

and counters5

• Provide =DA: ith status o& sitches andreclosers 2-+A and -+B5



(he 'DAS ComponentsAutomation Contro!!ers

• ?)C 11.1"."compliant

logic engine 2DA logic5

• Data concentration and

control signal issuance

• Protocol conversion

• :@) recording

and vieing

• Remote engineering

access

• ?ntegrated security and

data access control

• )vent alerts via email

and voice annunciation

through telephone



(he 'DAS ComponentsComputer

• Runs %<? and :CADA system

• Runs oscillographic event reports

collection so&tare

• Provides summary database &or stored

event data

• :ends email ith event summary andattached oscillographic event data report



(he 'DAS ComponentsSate!!ite)Syn"hroni.ed C!o"3

• ?s high"accuracy time source 21!! ns5

• Provides ?R?G B signal to =DA:, hich‑

distributes time signal to ?)Ds via :#'P



Automating a S%it"h

• -+A and -+B sitchcontacts

• >ine"side C's

• :;, pressure sitch

• <otor"operated

sitches

• ;iber netork



Distribution System $n&ormation !o%

Reclosers and

>ine":ide :itches

>oad":ide ;ault

?nterrupters

Recloser Controls

and Dual";eederProtection Relays

;ault ?nterrupter

Controller

Automation Controller 1 Automation Controller +

:atellite":ynchronied Clock Computer

2%<? and )vent Collection5

)vent

<essenger

'elephone

:<'P

:erver

)mail



Automati" Re"on&iguration Seuen"eDA )nabled

#e )vent

Detected

=pdate

Complete

Permanent

;ault Con&irmed

;aulted :ection

?solated

?dle

=pdate

Analye

?solate

Restore

)vent

Cleared

Recon&iguration

Complete

#e )vent

#e )vent

#e )vent









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10101

10110

10101 10101 10101 1010110101 10101 10101 10101 10101 10101

10101

10110 10110 10110 1011010110

10110

10110

10110

10110

10110

10110

101010101010101010

-pen

-pen



101010

C!ose



101010

C!ose





'DAS Automati" Sour"e

(rans&er S"heme



101010101010

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C!ose



101010101010

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C!ose



Abnorma! System Conditions

$nhibit 'DAS

• ?)D in local mode

• Device diagnostic &ailure

• Communications &ailure• Reported command &ailure

• %old tag present on ?)D



'DAS uture Epansion

• ;le*ibility automatic detection andaccommodation o& changes made to

system topology

• :calability easy modi&ication o& netorktopology ith drag"and"drop &eature





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Electrical Distribution Automation

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