JAN-11-99 08:49 From:

December 30,1998

Mr. John A. Gauthier

National Electrical Manufacturer% Association

1300 N, 17'* Street

Suite 1847

Rosslyn, VA 22209

Dear John:

ASC C57 Letter Ballot for NEMA TP 2-1998

T-697 P.02/05 Job-322

The EL&P Delegation to the ASC C57 Committee on Transformers, Regulators, Reactors and Bushings

have cast their letter ballots to the following proposed American National Standard:

NEMA Standards Publication No. TP 2- 1998 "Standard Test Method for Measuring the

Energy Consumption of Distribution Transformers"

Of the six votes available, all were cast as negative ballots. Therefore, the ASC C57 EL&P Delegation

does not recommend approval of NEMA TP 2-1998 as an ANSI Standard. The reasons for the negative

ballots were unanimous. A sununaiy of the specific comments on NEMA TP 2-1998 are attached for your

information.

Since most of the document is already in C57,12. 90 and some of it is in C57. 12.00, NEMA TP 2-1998

should be incorporated into these documents the same as TP-1 is being incorporated into C57,12.33. We

recommend the appropriate IEEE Transformer Committee Working Groups be charged with this task and

that they address the DOE Energy Conservation Program initiatives. The Delegation also feels that having

two ANSI Standards with similar subjects would be confusing to all users (utility, commercial and

industrial) and would not be in the best interest of our industry.

If you have any questions pertaining to the above, please call me on (973 ) 430-7743.

Sincerely,

Paul E. Orehek

Chairman, EL&P Delegation to

ASC C57 Transformer Committee

Attachments

 EE-DET-97-550 COMMENT 16
JAN-11-99 08:49 From:

C G. N. Miller -- EEI

G. Andersen -EL&P Delegation

T. Diamantis -EL&P Delegation

K. S. Hanus -EL&P Delegation

C. G. Niemazm -EL&P Delegation

J. C- Sullivan -EL&P Delegation

J. H. Matthews - C IEEE Transformers Committee

B. K. Patel - Vice Chairman IEEE Transformers Committee

L D. Borst - Chairman ASC C57 Transformers Committee

aATP2ballat

41

 EE-DET-97-550 COMMENT 16
JAN-11-99 08:49 From:

Summary of Specific

Comments on NEMA TP-2

T-697 P. 04/05 Job-322

General Most of the first five sections of the document are already in C57.12.90 and some are in

C57.12.00

Para 3.2 "test current" should be removed.

Para 3.2.1 The paragraph is the same as in 057.12,90 except "or the test current is less than .15

amperes" was added in TP-2.

Para 3.2.2 TP-2 replaced "temperature rise determinations" in C57.12.90 with "transformer

winding resistance measurements."

Test Sets C57.12. 90 shows connections for single-phase transformers with and without instrument

transformers and three-phase transformers using the three wattmeter method. TP-2

shows only a three-phase test set with and without instrument transformers.

Para 4,1,4 This Is similar to paragraph 9.4.1 in C57,12.90 but not the same. TP-2 also uses 220

microradians while 290 microradians is used in C57.12.90.

Para 4.3.2 The second sentence from the end "The test should be conducted at the rated current and

voltage of the nominal tap position" is new.

Para 4.3.3.1 The last sentence "Also, line-to-line impedance loss measurements of single-phase

transformers should not be used " is not part of 057, 12.90,

Para 4.3.4 TP-2 added " if significant."

Para 5.2 C57,12.90 states that load losses shall be determined for rated voltage. current and

frequency and corrected to a reference temperature. The reference temperature is in

C57.12.00 and is 95 deg C. TP-2 states the load losses calculations shall be based on

operation at 50 percent of rated power output and corrected to 55 deg C.

Alnematp.2commrntsil2

41

 EE-DET-97-550 COMMENT 16
JAN-11-99 08:49 From : T-697 P.05/05 Job-322

LETTER BALLOT

C57

PLEASE RETURN THIS BALLOT TO:

JOHN A. GAUTHLER (C57)

NEMA

1300 North 17th Street, Suite 1847

Rosalyn, Virginia 22209

Fax 703-541-3353

I[]

IE,

APPROVE

DISAPPROVE

ABSTAIN

Approval of NEMA Standard TP-2, as an American National Standard

COMMENTS

Nam S c C.7

CompanylDelegation

Date

PLEASE RETURN THIS BALLOT NO LATER THAN December 30, 1998

 EE-DET-97-550 COMMENT 16