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Applications For DAA DataBeyond Transformer Load

Management

Presented by: Donald J. Kane P.E.

Asset Systems Program Manager

Connecticut Light & Power

October 19, 2010

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CL&P A subsidiary ofNortheast Utilities

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CL&P

4 Divisions

13 Districts

235 Substations

1,085 FeedersMGY, UGY, and DeltaVoltages from 2.4kv to34.5kv

40 Circuit

Owners plus 6staff engineers

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2003 Review several TLM products,

including ITRONs DAO/DAA

2004 ITRON selected, plans for

implementation begin (late 2005 start)

2007 Implemented DAA (without On-Demand), and trained 40 users by ITRON

at NUhalf day sessions.

2009 Updated with 2008 Summer loads.

DAA Implementation History

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General Issues and ChallengesData Source Changes

New CS system implemented in 2009

New MDM implementation ongoing (2011 completion)

GIS Details and Error CorrectionTransformer sizes and phasing

Customer to Transformer ConnectivityUsing OMS for this relationship presently

Plans to use GIS eventuallySome difficulties maintaining accuracy

Feeding the BeastAHuge amounts of data, even without smartmeters

ANo concrete plans for on demand updates yet

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Transformer Load ManagementFind overloaded transformers before they fail

Too many false positives-big problem

Looking for ways to minimize false positivesDatafeed for Loadflow Applications

Estimate errors not as big a problem

Just need to weed out extreme errors (very large load estimates)

Much better to use than connected KVA

Operations/New Service ReferenceCasual or emergency transformer load lookup

For transformer trip/failure-Reset or replace/upgrade?

For new service-Place on existing transformer or upgrade size?

Distribution PlanningASignificant load additions Can upstream devices handle the load? Whatphase to use?

AOverload checks for major devices (S/S transformers, step transformers,regulators, reclosers, etc)

A

Substation meter error checking

Potential Applications for DAA Results

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Load Estimates from

DAA in loadflow models

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Web Tool to manage follow-up work from

identifying overloaded transformers.

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Also used to look up transformer loads for routine or emergency queries.

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and to verify/correct customer to transformer connectivity

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Check % loading and

customer counts onupstream devices to

determine potential

problems for new load

connections.

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Check phase balance on

upstream devices, forselection of what phase to

use for new single phase

loads.

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Measured load (from station meter) diverges from

predicted model - indicates a possible switching

event where this substation bank picked up some

load.

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A view of the chart from another substation nearby

indicates a matching divergence between the

measured load and the predicted profile