## Work shop on T es t Procedur es f or E lectric Di s tribution Tran s form er s

Michael J. McCabe February 10, 1998

## Background

Determination published on October 22, 1997, that standards appear to be technologically feasible, economically justified and would result in significant energy savings.

# Standards

DOE will apply the new process Standards rulemaking will be initiated after the test procedures rulemaking rioritization will apply

# Priority Setting Process

• The new priority setting process invites public input on the program ' s rulemaking agenda • Annual prioritization of rulemaking activities • Based primarily on potential energy savings • With consideration of other economic and 

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# Purpose of Workshop

Present staff draft test procedure

. Seek comment/input on identified issues

. Identify other test 

### procedure issuesAppliance Rulemaking Process

Determination Notice Test Procedures 01 Standards

## Test Procedures Test procedures are used for Rating Appliances Labeling 

## Standards

# Test Procedures

. DOE will work with interested parties to develop test procedures . DOE will use consensus test procedures , where appropriate , in developing the proposed rule . Proposed Rule - Summer 1998

. Final Rule - Summer 1999

## Distribution Transformer

Workshop 10 Feb 98 Kathi Epping

### CONSENSUS STANDARDS

• ANSI C57. 12.90-1993 , " IEEE Standards Test Code for LiquidImmersed Distribution , Power and Regulating Transformers and IEEE Guide for Short Circuit Testing of Distribution and Power Transformers" • ANSI C57.12.91-1.995, "IEEE Standard Test Code for Dry-Type Distribution and Power Transformers" • ANSI C57.12.00-1993, "IEEE Standard General requirements for Liquid-Immersed Distribution, Power and Regulating Transformers" • ANSI C57.12.01-1989, "IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers, including those with Solid Cast and/or Resin-Encapsulated windings"

## Unofficial Standards

NEMA Draft TP 2, "Standard Test Method for Measuring the Energy Consumption of Distribution Transformers"

• IEEE PC57.123, "Draft Guide for Transformer Loss Measurement"

## Consensus Standards

• Are the consensus standards appropriate for referencing as the DOE-required test practice?

• Is the clause-by-clause referencing of ANSI standards in the NIST Draft, pp. 16-20, too detailed? Should it be abbreviated by referencing only the appropriate sections in the two test codes-those describing do resistance, no-load loss, and load loss measurements-and alluding to the specific clauses where exceptions are made?

## Consensus Standards

• Should additional relevant standards now in preparation and approval stages, such as IEEE PC57. 123/D "Draft Guide for Transformer Loss Measurement" & NEMA TP-2 be considered additional or alternative references? Will they add to the knowledge base of the already existing consensus standards or enhance the user convenience?

## Basic Model Definition

• Basic model means all units of a given type of covered equipment (or class thereof) manufactured by a single manufacturer and, with respect to distribution transformers, which have the same rating, have electrical characteristics that are essentially identical, and do not have any differing physical or electrical characteristics which affect energy consumption or efficiency.

## Basic Model

In view of such a definition for a "basic model," do you anticipate significant difficulties in grouping your products into basic models? • For those manufacturers having only a few items per model, would it be possible to combine a number of models into

- families of basic models, e.g., grouping many actual production models of the same nominal kVA rating in one family of models?

## Basic Model

• Would it be possible to combine similar manufacturing models, e.g., having the same nominal kVA rating, in one "basic model" by using normalized loss data?

## Basic Model -normalized losses

"Loss Percentage (LP)" defined as LP=100 [ 1 +(AL-ML)/ML where AL represents actual measured total losses, and ML represents mandated maximum total losses

• Such an approach appears to be valid for all manufacturing models having similar variability for (AL/ML).

## Sampling Plan

Please provide comments on the two sampling plans DOE is considering for compliance testing.

• Please describe other approaches you believe DOE should consider.

## Measure of Energy Consumption

Are there any strong reasons why efficiency should not be used? Should other measures of energy consumption be considered: e.g., loss power normalized relative to output kVA, either on per unit basis or percentage basis? Is reporting of efficiency and losses at reduced loading levels appropriate for an energy conservation standard?

## Industry Burden

What specific requirements in the NIST draft test proc edure are causing concern about significant additional burden imposed by testing requirements?

## Reference Temperatures

• 20°C for No Load, both Liquid-Immersed & Dry-Type

• Single Reference Temp. of 75°C for Load for Dry-Type

• 55°C for Liquid-Immersed at 50% Load

## Corrections

• Using C.57.12.90

• Load loss correction due to phase angle for both liquid and dry-type

• No load loss corrected to reference temperature of 20oC

## Quality Assurance

• C57.12.00 Measurement Uncertainty Tolerances Are there concerns about applyingmeasurement accuracy requirements to drytype transformers (as is now done for liquid-immersed) and about including a clause for guidance from ISO 9001-1993 on measurement quality assurance procedures?