DEPARTMIEN OF ENERGY WORKSHOP ON. TE ST PROCEDURES FOR DIS TRIB UTION TRANSFO

Febru ary 10,1 S U.S. D epa rtm ent of Energy 1000 In dependence Avenue, S. W.

Room 1E-245 Purpose of Workshop The purpose of the works for distribution transfo Department will conside submitted informulating transformer test procedur

AGEN L WELCO MIN G RENIAR K 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" "

!**Eiiclosun~.** (3) DEPARTMENT OF ENERGY WORKSHOP ON. TEST PROCEDURES FOR DISTRIBUTION TRANSFORMERS February 10, 1998 

## U.s. Department ofEnergy 1000 Independence Avenue, S.W.

. Room lE-245 Purpose ofWorkshop

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 cl ause, 4.11.1, from IS O Standard 9001-1993 , " Quality Systems

- Model for

quality as surance in design , development , production , install ation , and servicing" Questions and Request for Comments (1) Ar e 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. B urden impos ed on indus testing and data processing Will such standards

e t procedure are causing concern about } ng requirements ? Please cite difficulties

C. D ic m 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) 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? ,approval stages , such as

" urement and "" tj" 

### • 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 ofANSI 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 ofthe 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 ofmodels into families ofbasic models, e.g., grouping 'many actual production**m~els** 

### ofthe same nominal kVA rating in**orief~y** 

### ofmodels7 

# -.Sampling pla n for units to be test ed .

At this time DOE is consid ering one of two sampling plans for compliance testing: 1) The plan de scribed in §430
. 23, using the lower 95 percent confidence liynit but without specifying the . ' um number of unit s in the sample (A minimum of two units iv, licitly required to estimat e 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 versi o n 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 . "

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 ofunits in the sample (A minimum oftwo 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 ofreplacing 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 ofdetermination ofcompliance 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 ref eren ce temperatu res th e ref eren ce temperatures in consensus sta ndard s la ck unifo rm ity. 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 overe stimated , 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 liquid"'""'`` immersed and d ry-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? 

### 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 of20°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? 

# ..... '