DEPARTMIEN OF ENERGY

WORKSHOP ON.

TEST PROCEDURES FOR DISTRIBUTION TRANSFO

February 10,1 S

U.S. Department of Energy

1000 Independence Avenue, S.W.

Room 1E-245

Purpose ofWorkshop The purpose of the works

for distribution transfo

Department will conside

submitted informulating

transformer test procedur

AGEN

L WELCOMING RENIARK AND

OPENING STATEMENTS

TOPICS

}issues surr die

'' presented and t ` ents

rule for distribution

fining energy etticiency of pestribution

dards Test Code for Liquid-Immersed Distribution,

ers and IEEE Guide for Short Circuit Testing of

ransformers"

;"IEEE Standard Test Code for Dry-Type Distribution and Power

-1993, "IEEE Standard General requirements for Liquid -Immersed

ower and Regulating. Transformers"

57.12 .01-1989, "IEEE Standard General Requirements for Dry-Type Distribution

and Power Transformers, Including Those with Solid Cast and/or Resin-Encapsulated

Windings"

NEMA TP 1-1996, "Guide for Determining Energy Efficiency for Distribution

Transformers"

EE-TP-98-550 COMMENT 01C

" 

! 

Eiiclosun~. (3) 

DEPARTMENT OF ENERGY 

WORKSHOP ON. 

TEST PROCEDURES FOR DISTRIBUTION TRANSFORMERS 

February 10, 1998 

U.s. Department of Energy 

1000 Independence Avenue, S.W. 

. Room lE-245 

Purpose of Workshop 

L 

n. 

ID. TOPICS 

• 

• 

nal:aoD.al and iDtemation81 consensus 

Dining en,ergy efficiency' of distribution 

Hlti •• rtf" Test Code for Liquid-Immersed Distribution, 

and IEEE Guide for Short Circuit Testing of 

Standard Test Code for Dry-Type Distribution and Power' 

993, "IEEE Standard General requirements for Liquid -Immersed 

and Regulating. Transformers" 

7.12.01-1989. "IEEE Standard Oeneral Requirements for Dry-Type Distribution 

and Power Transformers, Including Those with Solid Cast and/or Resin-Encapsulated 

Wmdings" 

• NEMA TP 1-1996, "Guide for Determining Energy Efficiency for Distribution 

Transformers" 
A single clause, 4.11.1, from ISO Standard 9001-1993, "Quality Systems - Model for

quality assurance in design, development, production, installation, and servicing"

Questions and Request for Comments

(1) Are the six consensus standards appropriate for referencing as the E-required test

practice?

(2)- - Is the clause=by-clause referencing of ANSI standards draft Procedure for

Distribution Transformers," pp. 16 - 20, too detailed ould. k •" cing be

abbreviated by referencing only the appropriate s ns in the those'

describing dc resistance, no-load loss, and load l measur 'ts- ` ' in

specific clauses where exceptions are made?

(3) Should additional relevant standards now in prep

IEEE PC57. 123/131 . 1 'Vraft Guide for Transfo

NEMA TP-2 be considered as additional or alt

add to the knowledge base of the already ee

enhance the user convenience?

B. Burden imposed on indus

testing and data processing

Will such standards

e t procedure are causing concern about }

ng requirements? Please cite difficulties

C. D icm for distribution transformers.

owing definition for "basic model " regarding transformers: ^Mll

a given type of covered eauipment (or class thereof)

ufacturer and, with respect to distribution transformers, which have

ical characteristics that are essentially identical, and do not have any

ical characteristics which affect energy consumption or efficiency."

equest for Comments

of such a definition for a "basic model," do you anticipate significant difficulties in

grouping your products into basic models?

(2) Forthose 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?

,approval stages, such as

urement" and

"" tj"

EE-TP-98-550 COMMENT 01C

• A single clause, 4.11.1. from ISO Standard 9001-1993, "Quality Systems - Model for 

ciwilitY assurance in design, development, production, installation, and servicing" 

Questions 'and Request for eominents 

(1) Are the six consensus standards appropriate for referencing as the ....... ..."., .... -. 

,practice? 

(2), ' Is the clause-by-clause' referencing of ANSI staJlldarCi 

Distribution Transformers/' pp. 16 - 20, too abbrevi~ted ~y referencing only the appropriate 

describing dc resistance, no-load loss, and load 

spcicmc clauses where exceptions are made? 

(3) Should additional relevant standards now in 

IEEE peS7 .1231D 1.1 ''Draft GUide for Tr",n.,~l"r 

NEMA TP-2 be considered as additional or ... ~ .. , ...... , .. 

add to the knowledge base of the already 

enhance the user corivenience? 

B. Burden imposed on 

testing and data processing 

' .. ,.., •• _...., by additional 

procedure are causing concern about 

requirements? Please cite difficulties 

'for distribution transformers. 

d~finition for ''1,asic model" regarding transformers: 

given type of covered equipment (or class thereof) 

tanlJta(:rurler and, with respect to distribution transformers, which have 

characteristics that are essentially identical, and do not have any 

characteristics which affect energy consumption or efficiency.'" 

of such a definition for a "basic model," do you anticipate significant difficulties in 

groupmg your products into basic models? 

(2) For those manufacturers hB.ving 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 m~els of the same nominal kVA rating in orief~y ofmodels7 

-. 
Sampling plan for units to be tested.

At this time DOE is considering one of two sampling plans for compliance testing:

1) The plan described in §430.23, using the lower 95 percent confidence liynit but without

specifying the . ' um number ofunits in the sample (A minimum of two units iv, licitly

required to estimate the confidence limit.) The "K" factor, based on th _ pe. „1 t loss

tolerance specified in ANSI C57.12.00 and C5.7. 12.01, is sele, ed to

2) A modified version of the proposed sampling'p

outlined in 61 FR 60474 - 60475, Appendix B to Subp

Enforcement Testing," is considered for compliance t

considered modification consists of replacing the facto

equation (5) by the new factor (106 - 0. 06 SFE)/SFE(6

probability of obtaining a determination of compliance

standard.

For enforcement testing, DOE is consi

probability of determination of compliance

questions and Request for Comments

(1) Please provide comments o

testing.

is equal to the

rgy consumption for distribution transformers.

z ns why efficiency should not be used?

s of energy consumption be considered : e.g., loss power normalized

VA, either on per unit basis or percentage basis?

efficiency and losses at reduced loading levels appropriate for an energy

bn standard?

ution Iran

SFE)/SFE(20 - F) in

This plan yields a 90 percent

EE-TP-98-550 COMMENT 01C

. " 

D. Sampling pian for units to be tested. 

At this time DOE is considering one of two sampling plans for compliance testing: 

1) The plan described in §430.23, using the lower 95 percent confidence 

specifYing the minimum number of units in the sample (A minimum of two units 

" "required to estimate the confidence liri:tit.) The "I{" factor, based on 

tolerance specifiedfu ANSI C57.12.00 and C57.12.01; is to 

" 2) A modified version ofth~ proposed sampling 

outlined in 61 FR. 60474 - 60475, Appendix B to 

. Enforcement Testing, " is considered for compliance 

considered modification consists of replacing the factor 

. equation (5) by the new factor (106 - 0.06 SFE)/SFE(6 

probability of obtaining a determination of compliance 

standard. 

For enforcement testing, DOE is 

" probability of determination of compliance 

but changing the 

2.5th percentile. 

is considering for compliance 

(2) 

consumption for distribution transformers. 

why efficiency should not be used? 

of energy consumption be considered: e.g., loss power normalized 

A, either on per unit basis or percentage basts? 

efficiency and losses at reduced loading levels appropriate for an energy 

standard? 

-. 
a

io

F. Selection of reference temperatures the reference temperatures in consensus

standards lack uniformity.

Questions and Rea st for Comments

Please provide comments, especially if there are in your view strong reasons for or against

the following modifications in reference temperatures from the values established in , SI

Standards C57.12.00 and C57.12.01:

(1) . Specifying reference temperature of 20°C for no-load asses of ,, ' 2 ransformers (also

' required by TP 1).

(2) Specifying a single reference temperature of 75°

having all five insulation classes and two loadin,

10 temperature rise conditions are approximat

temperature rises indicates that for four conditio

underestimated (the actual temperature will be

overestimated, and for one the calculated tem

(3) Specifying a reference temperature of 5

transformers at 50% load.

i uired b eq 1Nk",>::.. ct

alculation of th

;nce temperature rise is

G. Requirement for apply'orrec s to m ` cement data of both liquidimmersed and dry-type types o "'""'``

V.

plying if required, to measurement data of drydone of liquid immersed transformers?

Off applying measurement accuracy requirements to dry-type

oer done for liquid-immersed transformers, and about inclusion for

se from ISO 9001-1993 on measurement quality assurance procedures?

EE-TP-98-550 COMMENT 01C

F. Selection of reference temperatures - the ftf'erence temperatures in consensus 

ltandards lack uniformity. ' ' 

Questions and ReQ.Uest for Comments , 

Please provide comments, especially if there are in your view strong reasons for or against 

, the following modifi~ons in reference temperatures from the values established in 

Standards C57.12.OO and C57.12.01: 

(1). SpecifYing reference temperature of 20°C for nU·llOao 

'required by TP 1). 

. (2) Specifying a single reference temperature of 

having an five insulation classes and two ."' ... ,uujlli 

1 0 temperature rise conditions are 

temperature rises indicates that for four conlditi,oI 

undt~estimated (the'actual temperature will be 

ovemstimated, and for one the calculated t",,,.,nlIII 

(3) Specllymg a reference temperature of 

transformers at 5()oA, load. 

G. Requirement for 

immersed and dry-type types 

IrelllBellt data of both liquidif required, to measurement data of dry· 

immersed transformers? 

v. ADJOURNMENT 

applying measurement accuracy requirements to dry-type 

done for liquid.immersed transformers, and about inclusion for 

from ISO 900 1-1993 on measurement quality assUrance procedures? 

..... '