ML20076G394

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Responds to 830728 Request for Info Re 1980-82 Main Transformer Failures.Statistical Info Taken from Yearly Doble Engineering Co-client Conference Minutes on Transformer Failure Encl
ML20076G394
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 08/26/1983
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Clark R, Harold Denton
Office of Nuclear Reactor Regulation
References
457, NUDOCS 8308310239
Download: ML20076G394 (16)


Text

. _

s VINGINIA ELEcTHIC AND POWER COMI*ANY HIcnwoND,VIHOINIA 23261 W.L. STEWART Vics Puneronwy N :ctuam OPERATIONS August 26,1983 Mr. Harold R. Denton, Director Serial No. 457 Office of Nuclear Reactor Regulation N0/JHL:acm Attn: Mr. Robert A. Clark, Chief Docket Nos. 50-338 Operating Reactors Branch No. 3 50-339 Division of Licensing License Nos. NPF-4 U. S. Nuclear Regulatory Commission NPF-7 Washington, D. C. 20555 Centlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 RESPONSE TO THE REQUEST FOR INFORMATION REGARDING MAIN TRANSFORMER FAILURES Per your request for information regarding main transformer failures at North Anna Unit Nos. I and 2, dated July 28, 1983, enclosed is the statistical information which is part of the yearly Doble Engineering Company-client conference minutes on transformer tailures.

Very truly yours, 1

lf

-e

, M W. L'.L Stewart Enclosure cc: Mr. James P. O'Reilly Regional Administrator Region II

, Mr. M. B. Shymlock NRC Resident Inspector North Anna Power Station

/se/

8308310239 830826 gDRADOCK 05000338 PDR ,

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,' 1900 YEARLY TRAtlSFORMER FAILURE SURVEY Tallure kV Rated-BIL

.N o. H L T MVA Ase-yrs. Forus* Phase 1 161 750 19-150 - 230 26 s - - 3 _

2 161-750 17.1 150 - 170 26 s - - 3 3 161- 36 - 20 10 - - - 3 4 140- 48- 4.8- 50 31 s - - 3 5 138-550 13.8 110 - 50 11 - c - 3 6,- 138 550 46-250 - 30 26 s - - 3 7 138- 12- - 18 - - c - 3 ,

8 132 550 13.5-110 - 12 25 - c - 3 9 115 550 13.8-110 - 20 24 - c - 3 10 115-350 13.2-110 - 22.4 14 - c - 3 11 115 350 13.2 110 - 22.4 11 - c - 3 12 110-550 13.5- -

13.3 37 s - 1 -

13 110-450 13.09-110 -

12 13 - c - 3 14 110-450 13.09 110 - 12 8 - c - 3

?

15 110- 13.8 - 25 - - c - 3 16 69-350 13.8 95 - 10.5 17 - c - 3 17 69-350 4.3-95 3.75 18 - c - 3 18 69-350 13-110 2.4-75 10 26 - c - 3 19 69- 13 8 2.4- 12 20 - c - 3 20 69- 12- -

6 1 - - - 3 21 67-350 7.2-110 -

1.67 - - c - 3 2 66 34.5 136- 45 29 - - - 3 23 63-350 12.47-110 -

7.5 22 - c - 3 24 46- 72- -

5 1: - c - 3 25 34.5 200 12 110 -

5 12 - c - 3 26 34 4-200 13.09-110 -

10 25 - c - 3 2' 34.5- 2.4-4.8 -

1.0 - - c 1 -

4 21 34 & 5.04-8.7 -

0.833 - - c 1 -

29 34- 4. -

6.25 - - - - 3 30 34- 4- - 4 687 - - - - 3 31 26 4- 4.16- - 3.75 - -

c 1 -

3: 25- 12 -

20 16 - - - 3

132-110 11-45 0.575- 625 38 - c - 3 i 34 345-1050 16.2-150 -

285 8 - c -

35 115-550 33-200 -

7.5 25 - c - 3 36 230 900 115 550 13.8-110 150 $ - c - 3 37 66-350 12-110 -

7.5 12 - c - 3 32 66-350 8-110 - 0.25 33 - c 1 -

39 12- 2.4- - 1.5 56 s -  ;

40 60- 14 4- -

12 3 s - -  :

41 500-1675 161 750 26-200 400 12 - c 1 -

42 161-750 69-350 13.8-110 66 24 - c 1 -

43 161-750 17.1-150 -

170 22 - c - 3 44 230- 116- 14b 145 1 - c -  :

4! 13b-450 69-350 12-110 15 lb - c - 3 4 138- 144- - 21 - - c - 3 47 110-450 13.09-110 -

12 6 - c - 3 48 69- 12- - 15 F - c - 3 49 46- 13.8 -

5 13 - c - 3 50 34- 13 -

6 25 - - - - 3 51 500- 230- -

392 14 - c - 3 52 500- 138- - 392 3 - c - 3 53 345 138 13- 234 12 - - - -

54 345- 22.8- -

700 15 - - - 3 55 335- 138- 13.8- 234 1 rr - c - 3 56 230-825 24.7-150 - 800 9 - c - 3 57 230-650 115-350 37.5-200 168 14 - c - 3

  • s = shell; c - core W89) .p.

4-TR81 db

y.. . -

^

~

1980YEARLYiRANSFORMERFAILURESURVEY Fblin kV Rosed.BIL N o. H L T MVA A ge-yn. Fons' Phase 55 154- 60- 11- 60 - - - - 3 Sc 147.3- 13.2- - 15 10 -

c - 3 00 138- 69- 13.2 20 24 - c ! -

61 138-450 25 200 - 7.5 13 - c 1 -

62 118- 14.4- - 0.70 - - c - 3 63 132-550 13.8 110 -

12 24 - c - 3 64 115-450 44 250 2.4 110 3.3 34 -

c - 3 -

65 115- 33- - 20 - - c - 3 e6 115-350 13.09 110 -

24 3 -

c - 3 67 115-350 13.09-110 -

24 3 - c - 3 68 110- 14 4- -

62.5 - -

c - 3

-69 110-450 13.8-110 - 30 21 - c - 3 70 110-450 13.09-110 -

20 1 - c - 3 71 110-450 13.8-110 -

20 10 -

c - 3 m 72 110- 13 8- 46- - - -

c - 3 3 69-350 13.8-95 -

10.5 16 - c - 3 74 69 13.8- -

7.5 - -

c - 3 j 75 69- 13.00- -

7.5 17 -

c - 3 76 60- 12.47- 75 11

[ - -

c - 3 7* 69-350 12-110 - 7.5 12 -

c - 3 78 69- 12- -

15 6 -

c - 3 To 67- 2*- 33.3 c 1 -

80 67- 13.09- -

- 17 -

c - -

81 67-350 13.09-110 -

5.0 17 -

c - 3 82 67-350 13.09-110 -

12 8 -

c - 3 E?67-350 13.04 110 -

7.5 -

c - 3 64 67-350 7.56-110 -

3.33 25 -

c 1 -

85 67-350 7.56-110 3.3 - -

c - 3 h6 66- 12- 4- 20 - -

- 1 -

E- 66- 12- 4- 20 -- - - , -

85 44-250 13.09-110 -

7.5 20 - c - 3 89 44- 13.09 110 -

75 16 -

c - 3 90 43.5- 12.47- -

5 - -

c - 3 91 34.5-200 12 110 -

25 I -

c - 3 92 32.5- 4 36 -

625 25 - c - 3 93 34.5- 7.56- -

3 333 - c -

3 04 34 4 i 13.09 -

5.25 19 - c -

3 9.: 34 4- 13.08- -

12.5 16 -

c - 3 9e 34- 4- -

6.25 - - - - 3 9- 13.8- 2.4. - 2.5 - - c - 3 9E 4.16 0 45 -

1.5 P -

c - 3 9c 500 345- 34.5 408 1 s - 1 -

100 345 230- 13.5- 400 4m s - -

3 f 101 345 141 13.8 300 e s - - 3 102 345-900 138-450 12 110 400 $ s - -

3 102 230-650 116-350 13.2 110 224 7 - c - 3

, 104 230-650 116 350 132- 74.9 12 -

c 1 -

{ 105 230-650 115 350 13.2-110 224 1m

- c - 3 106 230-650 36.5-200 -

112 11 -

c - 3 107 230-650 16.5 200 -

84 7 - c - 3 108 230-650 36.5-200 - 84 6 -

c - 3

.109 161- 69- 13.2- 30 10 -

c - 3 110 138-450 69-350 34.5-200  !!5 3 - c - 3 111^ 138-450 69-350 12-110 36 2 -

c - 3 112 s 138 450 69-350 12-110 30 15 - c - 3 113 138-450 69-350 12-110 92 12 -

c - 3 114 138-450 34.5 200 - 25 9 - c - 3 115 , 138 26.4 - 84 7 -

c - 3

' 116 \ 138- 26.4 -

25 10 -

c - 3

\

l

  • s = shell. c = core FR81 34

~

1980 YEAR,LY TRANSFORMER SURVEY Failure kV Rated.BIL No. H L T MVA Ase-yrs. Form

  • Phase 11'69-350 34.5-200 - 25 8 -

c - 3 118 69-350 12 110 - 7.5 12 - c - 3 119 26.4- 87- - 14 7 - c - 3 120 26.4- 4.16- - 2.24 1 - c - 3 121 138-630 34.5-230 - 160 18 s - - 3 122 115- 69- 13.8- 12.5 30 -

c - 3 123 ~ 115- 13.2- -

140 15 - c - 3 ,

124 110-450 13.8-110 -

20 24 - c - 3 125 110-450 13.8-110 - 26 22 - c - 3 126 110- 13.8- - 46 - - c - 3 127 69- 25- - 20 9 - - - 3 128 69 350 13-110 4- 16.8 14 - c - 3 129 69-350 13-110 4- 16.8 18 - c - 3 130 69- 12- - 10 16 - c - 3 131 34.5- 13.2- - 14 13 -

c - 3 132 34 4- 13.2 - 14 2 - c - 3 133 230-650 37.5-700 - 100 13 s - - 3 134 141.6-550 13.8 110 -

12 19 - c - 3 135 138-450 69-350 12-110 15 18 - c - 3 136 34 4-200 13.2 110 -

14 16 -

c - 3 137 34 4- 13.2- -

12.5 5w -

c - 3

~

138 34- 13.2 -

7.5 - - - -

139 115-550 24-150 -

30 13 -

c - 3 140 115 550 12-110 2.3- 5 12 - c - 3 141 66-350 7.2 110 -

0.667 13 -

c 1 -

142 60-350 4.16-95 -

7.5 16 -

c - 3 143 34- 13- -

6.25 - - - - 3 144 34- 13- - t,.25 - - - - 3 145 230-825 34.5 200 -

160 12 s - - 3 146 34.5-12 - -

25 16 - c - 3 147 24- 12.46- 2.3- 10 38 -

c - 3 148 34.5-200 12-4.16 - 5 12 - c - 3 149 136- 69- 13.2 30 14 -

c - 3 150 136- 69- 132- 30 10 -

c - 3 151 115-450 12 47 110 -

12 26 - c - 3 152 105-450 13.5- -

12 23 -

c - 2 153 66-350 13-110 - 63 28 -

c 1 -

154 46- 13.04- - 30 10 - c - 3 155 46- 832- -

20 15 -

c - 3 156 46- 832- -

10 19 -

c - 3 157 500-1300 115-450 -

224 16 s - - 3 I5t 500-1300 22-150 - 369.6 7 s - 1 -

159 367 1050 20-150 -

685 12 s - - 3 160 352.5- 141- -

500 6 s - - 3 161 138-450 69-350 34.5-200 7! 14 s - -

3 162 230-650 115-350 13.3-110 168 3 s - - 3 163 230-650 115-350 13.2-110 224 1m - c - 3 164 230- 118- - 650 11 -

c - 3 165 1392- 34 3- -

112 3 -

c - 3 166 138 69- 135- 30 32 s - - 3 167 138- 34.5- 12.0- 8.33 33 s - 1 -

168 138- 27- -

83 31 - c - 3 169 138-550 13.8 110 - 22.4 4 - c - 3 170 138-450 12-110 - 20 8 - c - 3 171 138- 12- -

20 11 - - -

3 172 115-350 36.5-200 -

84 13 s - - 3 4

  • s = shell: c = core TR81 f.O

., _.. 19,30 YEARLY TRAtiSFORMER FAILURE SURVEY,, ,, ,

i Fhil;re kV-Rated-BIL i N 3- H L T MVA Ase-yn. Form' Phase  !

173  !!5 350 36-200 - 44.8 5 - c - 3

, 174 115 34.5 - 40 12 s - - 3 175 115- 14 4. - 30 9 s - - 3 176 115-450 13-!!0 - 22.4 15 - c - 3 177 110-450 13.1-110 - 45 9 - c - 3 178 110-450 13.09-110 - 12.5 17 - c - 3 1 179 _

69- 14.4- - 10 7' - c - 3 180 69- 12.47- - 7.5 12 - c - 3 .

181 69- 12 - 10 8 - c - 3 182 67-350 13.09-110 - 18 15 - c - 3 183 67- 12.47- - 10 24 - c - 3 184 66.36- 13.04- - 42 15 - c - -

185 34.4-200 12.47-110 - 7.5 8 - .c - 3 186 33.5- 132- - 6.25 26 - c - 3 18" 33- 13- -

123 32 - c 1 -

4 188 22.9- 13.09- -

2.8 15 - c - 3 189 22-150 6.9-95 - 43 9 - c - 3 i- '190 132- 13.2- - 24 44 - c - 3 191 11-110 4.15-75 - 5 18 s - - 3 192 500- - - 250 - - - - -

193 230- - -

115 - - - - -

104 115- - -

1 - - - -

  • 3
  • Sheli; C = core i

a i

i 1

4 TR81 36 -

- ._. .. - . . - ~ . , - . _ . _ _ . _ _ _ . _ . _ . _. . _ _ . ._ , - - _ _ _ . .

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. , . . - . . . r. ,

- 1".31 YEARLY TRANSFORtiER FAILURE SURVEY l 4

Failure kV-Roted BIL Coil No. H 1- T MVA Age-yrs- Form

  • Phase Design" 1 220-825 69 13S- 200 6 s - - 3 e -

2 138-650 13.8 - 50 17 - - - 3 - -

3 138- 7.56- - $16.25 26 -

c 1 - c- -

4 134-550 13.8- - 15 - -

c - 3 c -

_5 132- 34 65- 138- 150 17 s - -

3 c -

6 115-450 13.8-110 - 24 13 -

c - 3 c. -

7 115-450 13.09-110 -

18 11 -

c - 3 c -

8 69- 1147 -

10 26 - c - 3 c -

9 69-350 12-110 -

7.5 13 -

c - 3 c -

10 69 12- - 7.5 12 -

c - 3 c -

11 69- 12- -

3.75 - - - -

3 e -

12 67- 14 4- -

12.5 - - - -

3 - -

13 67- 12.5- - 7.5 30 -

c - 3 c -

14 67-350 12.4- -

6.5 12 - c - 3 c -

15 66- 13.09- -

7.5 23 - c - 3 c -

16 46- 7.5-1147 -

10 16 - c - 3 c -

17 4- 5-8.32 -

12.5 16 -

c - 3 c -

18 34 4- 4.36- -

7.5 12 -

c - 3 c -

19 344- 13.5- -

10 35 -

c - 3 e -

20 34 4- 4- -

11.2 14 -

c - 3 c -

2: 34 <.- 4- -

11.2 14 - c - 3 c -

22 34- 13.2- - 0.5 - - - - - - -

23 33-200 13.5- -

15 24 -

c - 3 e -

24 13.5- 4.16- -

10 21 -

c - 3 - -

25 13.2-110 4.36-75 -

3.125 17 -

c - 3 c -

26 13.2-110 4.16-75 -

2.0 20 - c - 3 c -

27 110-550 40-250 10-125 31.5 6 - c 1 - c -

28 35- 36- -

10 19 -

c - 3 e -

29 127- S E- -

33 21 - c 1 - c -

30 86- 20- -

20 11 -

c 1 - c -

31 88- 13.2- -

7.5 14 - c - 3 e -

32 13.5- 4 6- -

25 19 - c -

3 e -

33 23C- 26- -

125 13 - c -

3 e -

i 34 161- 13 3 -

30 30 c 1 - c -

! 35 161- 136- - 30 30 -

c 1 - c -

36 135-650 69-350 23-110 56 16 - c - 3 e -

37  !!5-550 12 110 2.3- 5 5 - c - 3 c -

31 13.5 13.5- -

30 20 - c - 3 c -

3c 345-1050 230-825 13.8-110 235 c -

c - 3 e -

40 23G. 60- 12- 75 25 s - - 3 -  ?

41 230- 0.240- -

0.3 25 c 1

- - c -

42 138-550 69-350 23-150 33.5 14 -

c - 3 e -

43 66-350 8-110 0.25 33 c 1 -

c -

E 43.5 0.48-0.27' -

3.33 5 - c - 3 - r 45 66- 13.5- 2 16 c -

3 c -

46 525 1425 241.5-650 34.5-200 336 7 -

c 1 -

c -

47 230- 132.5- 60 2

- - c - 3 e -

45 161 12- 7.2- 25 11 - c - 3 c -

49 132- 12- -

50 - - - - - - -

50 132- 12- - 50 - - - - - - -

51 132- 12 - 50 - - - - - - -

52 110- 13.09- 20 11 c 3 c -

$3 67-350 12.4- 12 9

- - c -

3 c -

54 14.4- 0.277-0 480 -

2.0 2 - - -

' 3 - -

55 138-550 13.8-110 - 75 9 - c -

3 e -

56 66-350 4.16-75 -

10 9 -

c - 3 e -

  • s - shell: c = core
    • c = circular cous: r = rectangular coih

, n = new; m - months l 1

i l

l

TRTQ82 33 ,; -3 )

_ - . _ ._ __ _ _ _ - . ._. - . - -- u _

M ~ -"- -- ..:-

l 1931YEARLYTRANSFORMERFAILURESURVEY Fribure kV-Rated BIL Coll N o. H L T MVA Age-yrs. Form

  • Phase Design **

$7 66-350 4.16-75 -

7.5 10 - c - 3 c -

58 500-1675 20 7150 - 400 7 - c 1 - c -

59 38- 10- - 2 20 - c -

3 e -

60 -

38- 10 -

1 32 -

c -

3 c -

61 132- 12- - 50 -- - - - - - -

62 115-450 67-250 - 60 1 - c - 3 c -

63 34- 4.16- - 0.375 - - - - - -

64 34- 0.480- - 0.25 - - - - - - -

65 13.2-110 2.5- -

3.75 - - c -

3 e -

66 525-1425 241.5-650 - 300 7 - c ! - c -

67 345- 138- 13.2- 400 10 - c - 3 e -

68 345 900 138-450 12-110 400 13 s - - 3 c -

69 345- 138- 33- 300 - - - - - - -

70 345- 138- -

234 4 - - - 3 - -

71 345- 138- - 175 5 - - - 3 - -

72 345- 69- - 234 8 - - - 3 - -

73 345- 25- - 980 - s - -

3 c -

74 230-900 115-550 -

90 22 - c -

3 e -

75 230- 64- 10S- 28.9 46 - c 1 - c -

76

~~

230-650 36.5 200 13.2-110 100 11 - c - 3 e -

230- - - 600 7 - - -

3 e -

78 161- 64- 13.5- 72 - - c -

3 c -

79 161 750 22.5-150 -

300 29 - c - 3 c -

80 161 750 12.3-110 -

27.5 31 -

c 1 -

c -

Si 142.3-550 13.2 110 -

7.5 14 -

c - 3 - -

8: 138-550 69-350 14-110 168 9 - c . 3 e -

83 135 41.6- -

5 31 - c - 3 e .

84 135- 13.04- -

20 8 - c - 3 c -

85 135- 13.5- - 50 7 - - - 3 - -

86 134-550 13.5- -

7.5 - . c - 3 c -

87 120- 14- -

25 52 - - - 3 - -

88 115-550 34.5-200 -

40 25 - c - 3 e -

89 115-450 19.9-34.5 - 7.5 6 - - - - - -

90 115 550 13 5- -

20 17 - c - 3 - -

91 115 550 11.5 110 - 7.5 33 - c 1 -

c -

9; 115-550 11.5-110 -

7.5 33 -

c 1 - c -

92 69 350 23-150 2.4-60 20 20 -

c -

3 c -

04 60- 13.2- - 7.5 2 - c - 3 -

9 64- 12- - 20 - - - - - - -

9e 60- 7.5 10 - c -

3 c -

9' 67.2 350 12 47 110 -

7.5 21 - c - 3 - -

96 67 350 135- -

15 - - c -

3 c -

99 67 350 13.6 - 15 - -

c -

3 c -

1 00- 67- 13.09- -

16 6 - c -

3 c -

101 67- 13.09-7.56 -

0.833 24 -

c 1 -

c .

10: 67-250 .13.09-110 -

33 27 - c 1 - c -

10} 67-350 12.4- - 12 19 -

c -

3 c -

104 67 350 12.4- - 12 19 - c -

3 c -

105 67-J50 12.4- -

2.5 28 - c -

3 c -

106 67- 4.36- - 8.4 8 - c - 3 c -

107 66 350 34- -

45 31 - c -

3 e -

108 46- 12.5 -

10 9 - c -

3 c -

109 45 250 13-110 - 6.67 20 c 1 c -

110 43.8- 13.09 -

3.75 17 - c -

3 e -

til 34 4- 13.4- - 13.4 2m - c -

3 c -

  • = shell; e = core
    • c = circular coils; r = rect 4ngular coils n = new; m = months TRTQ82

. - - - . - -. a - --

g

. , .c. .. -

1981 YEARLY TRANSFORMER FAILURE SURVEY Failure kV-Rated BIL Coil N o. H L T MVA Age-yrs. Form

  • Phase Desig e **

112 34 4- 13.09- - - 26 - c - 3 c -

113 33- 4160- - 3.75 41 - - - 3 c -

114 14 4- 0.277-0.480 - 2.0 6 - - - 3 - -

115 14 4- 0.216-0.125 -

0.75 15 - - -

3 - -

116 13.8- 4.33- -

1.5 - - - - 3 - -

!!7 13.8 2.4. - 1 8 -

c - 3 c -

118 13.2 110 4.16-75 - 3.75 33 -

c - 3 e -

119 88 13.2 - 7.5 14 - c - 3 c -

120 34.5- 12.47- - 5 3 - - - 3 - r 121 525-1425 241.5-650 - 400 10 -

c 1 - c -

122 115 13.09-7.2 - li 1 - c - 3 c -

123 34.5- 13.00- - 7 13 -

c - 3 c -

124  !!5- 13.00- -

12 5 - c - 3 e -

125 34 4-200 13.2 110 - 5.6 12 -

c - 3 e -

l 126 34.4 200 13.2-110 - 9.375 12 - c - 3 - r 127 13.5- 2.4- -

3.75 - - c - 3 c -

128 345- 230- 13.8- 400 3 s - - 3 - -

129 345- IS- -

615 4 s - - 3 - -

130 230- 60- 12.47- 150 9 - c - 3 c -

131 230-650 36.5-200 - 45 6m - c - 3 c -

132 230-650 36.5-200 - 84 6 - c - 3 e -

l 133 230-650 36.5-200 - 112 11 - c - 3 e -

134 230-650 36.5-200 13.2-110 165 13 - c - 3 c -

135 230-650 25-150 --

515 s - - 3 c -

136 230- 24- -

850 4 -

c - 3 c -

137 135- 34. -

25 - - - -

3 c -

131 138-550 14-110 -

33 2! - c - 3 c -

139 135- 13.5- -

35 9 - - - 3 . -

140 69 350 12-110 -

12 12 - c - 3 c -

141 344- 4.16- - 3.75 9 - c - 3 - r i i 34- 0.240-0 480  !

142 - 1 7 -

e . 3 c -

143 20-34.5 4 8-8.32 -

0.333 - -

- 1 - - .

I 144 115-350 13.2-110 -

12.5 11 -

c - 3 e -

l 145 115-450 12.47 110 -

12 17 - c - 3 c - .

146 66 350 0.6-45 - 2.875 18 - c - 3 e - l 147 46- 5-8.32 - 5 11 -

c - 3 c -

141 34.5-200 11.5-110 2.4- 10 11 - c - 3 c -

14C 34 4- 13.5- -

10 17 - c - 3 c -

150 34- 13.S. - 30 li - c - 3 e -

151 525-1425 241.5-650 - 300 14 s - 1 - c -

152 142.3-550 13.2-110 -

25 17 - c - 3 - -

153 136 6-650 12.47-110 -

12 25 - c - 3 - -

154 110 450 69-350 - 15 31 -

c - 3 c -

155 34.5-200 12-110 - 5.0 2- - c -

3 e -

156 22-150 6.9-95 -

3.3 33 -

c 1 - c -

157  !!$-550 66-350 -

30 16 - c - 3 e -

158- 115-550 66-350 - 30 11 - c - 3 e -

159 66-350 7.2-110 - 0.667 13 -

c 1 - -

r 160 66-350 7.2 110 -

0.667 13 - c 1 - -

r 161 66-350 7.2-110 - 0.667 13 - c 1 - - r 162 34.5- 0.480- -

1.5 22 -

c - 3 c -

163 13.8- 4.16- - 3500 4 - - - 3 c -

164 138- 13.8- - 15 3 -

c - 3 e -

165 127- 88- - 5 6 - c 1 - c -

  • s = shell; e = core "c = circtuar cons; r = rectangular coils n = new; m = months TRTQ82 - 35 I i_3

- l

.1981 YEARLY -TRANSFORMER FAILURE SURVEY Fall.:re kV Rosed BIL Coil

%. H L T MVA Age-yrs. Form

  • Phase Design" 16e 35- 10 - 5 12 - c

- 3 c -

167 13.8- 0 48 - 0.75 12 - - - 3 - -

168 69-350 13-110 - 12 17 -

c - 3 c -

169 67-350 114- - 25 9 - c - 3 c -

~

170 230- 25- - 125 12 -

c - 3 c -

171 230- 22.5- - 575 o - c - 3 c -

172 230- 13.5- - 33 33 s - - 3 c -

173 27.6- - - 15 33 - c - 3 e -

174 500-1425 23.8-150 - 310 11 s - 1 - - r 175 500-1300 22 150 - 330 8 s - 1 - - r 176 500-1300 22 150 - 330 8 s - 1 - - r 177 345 1050 118-450 13 8-110 300 15 - c - 3 c -

178 345-1050 20.3-150 - 542 10 s - - 3 c -

179 345-1050 20.3-150 - 542 10 s - - 3 c -

180 345- 20 - 325 6 - - - 3 - -

181 230-650 69 350 13.2-110 37.33 2 - c 1 - c -

6 5182 230- 69- 12.47- 150 7 s - - 3 - r 183 230 900 13.6-110 - 43 30 s - 1 - - r 184 220-825 36- 26.25- 75 22 s - -

3 c -

185 139.2 '4.5 -

60 19 -

c - 3 c -

186 13&- 69- - 100 11 - c - 3 c -

18' 136 69-11470 -

5 - s - - 3 e -

181 138- 69- 13.8- 8.33 30 s - 1 - - -

189 135- 13.0' - - 3.75 5 - c - 3 c -

190 135- 23 - 40 10 - c - 3 c -

191 135- 13.5- - 50 8 - - - 3 - -

192 138550 13.09 110 -

10 15 -

c - 3 c -

193 132- 12- - 50 - - - - - - -

19.t 132- 12- -

20 - - - - - - -

195 120- 13.2- 16.6 e - c - 3 c -

19e 115- 69- 12.8 67.2 18 m - c - 3 c -

19' 115-450 34.5 200 - 40 12 - c - 3 c -

198 115- 14 4-5,315 -

12 22 - c - 3 e -

19c  !!5-450 13.2-110 -

22.4 17 - c - 3 c -

200 110- 13.09- 20- 15 - - c - 3 c -

201 110- 13.09 - 5 16 -

c - 3 c 202, 60- 23.9 - '0

, II - c - 3 c 203 69- 12 476 - 14 - s - - 3 c -

20;67-250 13.09-110 - 18 1- - c - 3 c -

205 66- 12.47-7.2 -

5 10 - c - 3 c -

206 66- 1147 7.2 -

5 10 - c - 3 c -

207 66- 6.9- - 0.833 54 -

c I c -

205 60- 13.5- - 10 32 -

c - 3 e -

l 209 46- 7.9-13.8 - 24 15 - c -

3 e -

210 46- 5-8.32 -

1.5 - - c - 3 c -

211 34.5-69 11470- - 50 - s - - 3 c -

212 34.5- 7.2- -

5 - c - 3 -

r 213 34.5- 7.2 -

1.5 33 - c 1 - c -

214 34 5- 2.4- -

2.5 27 - c - 3 c -

215 34 4-200 22.9 150 14- 18.7 24 - c -

3 c -

216 34.4- 4.36- -

10 -14 - c - 3 c -

217 34- 4.36- - 0.15 - - - - - - -

218 34- 0 480-0.277 -

5 12 - c -

3 e -

's = shell; c = core

    • c = circular coils; r = rectangular coils a = new; m = months TRTQ82 . _

Q . .. . _ . . ---. -- .. . ..-- - ..

w._-

e

, .. s 1981 YEARLY. TRANSFORMER FAILURE SURVEY Failure k% Rated-BIL Coi!

No. H L T MVA Age-yrs. Fonn* Phase Design" 219 33- 13.8-7.9 . 14.0 - - - - 3 - .-

220 33- 4.3- - 3.75 28 - c - 3 c -

221 23- 4 - 2.5 30 - c - 3 c -

222 22.9-150 13.09-110 - 7 12 - c - 3 c -

223 22.5 2.5- - 3.33 7m - c - 3 - 't 224 110- 69- 2.5 25 21 - c - 3 c -

225 109- 13.7- - 37.5 26 - c - 3 e -

226 69- 13.8- - 5.6 4 - c - 3 c -

227 69- 2.5- - 1.5 16 -

c - 3 c -

228 66- 0. 6- - 5 7 s - - 3 c -

i l

1

  • s = shell; e - core
    • c = circular cogs; r = rectangular coils n = new; m = months TRTQ82 - 37 p. %.. -

, . . . w. . . . - . . .. .,-. . . .

, _........;--~_

) .

- 1932 YEARLY TRANSFORMER FAILURE SURVEY Ft11xre k V.R ased.BIL Coil Failure N s. H L T MVA Ag'e-yrs. Fore

  • Phase Design Mode 1 330-1175 135 550 13.2-110 125 27 s - - 3 e -

o - -

2 230- 138- 13.8- 150 20 s - - 3 - - - -

  • 3 161-650 69-350 4.16 110 45 12 s - - 3 e - o - -

4 161- 45- 12 47- 33.3 9 - c - 3 e -

o - -

5 139.2- 34.5- -

15 20 - c - 3 c - o - -

6 132- 34 65- 13.8- 150 17 s - - 3 - -

o - -

? 116- 20.8 - - - - c - 3 c - o - -

8 115-550 13.8 110 -

20 25 -

c - 3 c - o - -

G 115-450 37.5-200 - 20 20 - c - 3 e -

o - -

10 115-350 37.5-200 - 22.4 16 -

c - 3 c - o - -

Il 115-350 13.2 110 -

22 4 14 - c - 3 c -

o - -

12 70 6- 13 8 - 10 70 - c - 3 c -

o - -

13 69- 33- 13- 45 30 s - -

3 - - - - a 14 69-350 24-150 4.16- 7.5 20 - c - 3 e - o - -

15 69-350 13.2- -

9.3 14 -

c - 3 e -

o - -

16 69- 13.2- -

10 10 - c - 3 e -

o - -

17 69 350 12-110 -

3.75 13 - c - 3 c -

o - -

18 69-350 12-110 -

12 17 - c - 3 c - o - -

19 69- 12- -

20 22 - c - 3 c - o -

20 6L 135- -

15 14 - c - 3 e -

o . -

21 67- 12 47- -

12 13 - c - 3 c - o - -

22 67- 12.4'. - 5 10 -

c - 3 e -

o - -

23 67- 12.47- -

7.5 13 -

c - 3 e - o - -

24 60-350 13.2-110 -

16.8 8 -

c - 3 c - - - e 25 46- 13 -

10 16 -

c - 3 e - o - -

26 E 10 -

10 33 -

c - 3 c - - - e 27 35 10 -

5 26 -

c - 3 e - - -

  • 21 3 S- 10- -

5 5 -

c - 3 c -

c. - -

29 34 4-200 13.2 110 -

1.5 35 -

c - 3 c - o - -

30 34- 4- -

3.125 - - - - - - - - - -

31 13 8- 416- - 10 8 -

c - 3 c -

o - -

32 13.2-110 4 33-75 -

1.5 35 - c - 3 e -

c - -

33 13-110 24- -

6 32 - c - 3 c -

o -

34 765 345- 34 5- 500 12 c 1 - c o - -

35 '

525- 135- 135- 200 -

c  ! - c -

o - -

36 765- 500- 69- 5500 1 c 1 *

- - c - - -

37 34.5- 13 5 1 - c - 3 c - - - e 38 26- 4 50 s - 1 - c -

o - -

30 88- 15.2- -

12 e 3 -

c -

o - -

40 85- 15.2- -

10 11 c -

3 - -

o - -

41 85- 15.2- 7.5- 22 c - 3 - - o - -

42 23G- 135- 13.5- 165 5 -

c - 3 c - - -

  • 43 230- 60- 12- 150 2t -

c -- 3 c -

o - -

44 138- 14 4 -

75 20 -

c - 3 e - - - e 45 23.76-46 230-13.2-

!!5- 13-6 55 225 17 ' .- s c -

3 3

c o

o

+ -

4? 230 115 13 215 25 s - - 3 - -

o - -

45 230- 60- 12- 75 26 -

s - -

3 - r o - -

49 230- 44- - 125 2 -

c - 3 - - - -

  • SO 230 13 -

86 25 s - 1 - - -

o - -

51 34.5- 4.16- -

I 9 -

c - 3 c -

o - -

52 762- 247- 13.8- 300 4 a c 1 - c - - -

53 230 115- 13- 115 27 c 3 -

- - - o - -

54 161-750 17.1 150 -- 170 26 -

c - 3 e -

o - -

55 161 13.2- -

20 30 - - -

- c - - -

  • 56 115-550 13.8-110 -

15.5 21 -

c -

3 e - o + -

  • s = shell; c = core

'c = circular coils; r rectariguiar coils

  • o = coil failurt; + = core failure; e = other failure (leans. etc.)

TRTQ83 . - - - 44_-. .-. - . _ . . . _ . -

1 .. . . . . ~..... .. - . .... -.

' ~ '~* ~

- - T - T-.-- -- L -- - -

1932 YEARLY TRANSFORMER FAILURE SURVEY Foilure kV-Rated BIL Coil Failure No. H L T MVA Age yrs. Form' Phase Design Mode 5' 161- 13 5- 18 10 -

c 3 c - o 58 144- 25 24- 10 1 - - - 3 - - - - -

59 138 550 13 09-110 - 12 8 - c - 3 c - o -

  • 60 138- 12 -

50 - - . - - - - - -

61 116- 12.47- -

12 11 c - 3 e - o - -

62 110- 13.09- -

20 10 -

c 3 e - - .

  • 63 69- 12.47- -

12 14 - c - 3 c - o - -

64 62.7-350 7.2-110 -

15 11 -

c - 3 e o - -

65 34.5- 4.8- - 20 18 -

c - 3 c -

o - -

66 13.5- 1- -

3.027 3 c - 3 c - o - -

67 138-550 134-650 14 4-110 56.8 10 - c 1 - c - - - -

68 115-550 12-110 - 5 20 - c - 3 c -

o + -

69 115-550 12-110 -

5 19 - c - 3 e -

o + -

70 38- 10 - 2 34 -

c - 3 c - -

  • 71 38- 10- -

2 32 -

c - 3 c - - -

  • 72 34. .48 - 2 - - - - - - - . - -

73 33 200 12-110 - 1.5 16 -

c - 3 c -

o -

  • 74 12- .45- -

2.5 - - - - - - - - - -

75 500- 230- -

392 16 - c - 3 c - - -

  • 76 345-900 138-450 12-110 400 15 s - -

3 c - o +

  • 345- 115 13 5- 445 e - c - 3 c - -
  • 78 289-1300 133-750 13.2 110 217 2 -

c 1 - c - - +

  • 7c 230 230 -

600 10 -

c - 3 c - - -

  • 80 230-650 165-200 -

84 9 -

c - 3 c -

o - -

81 230-650 36.5-200 13.2 110 56 14 - c - 3 c -

o - -

82 165- 130- -

160 25 -

c - 3 e o -

83 161- 69- -

13 41 -

c 1 - c - -

84 161 iS0 14. -

40 36 - - - 3 - - *

!5 161-115 13.5- -

20 21 -

c - 3 c -

o - -

8e 161-115 13.8-34.5 -

20 20 -

c - 3 c -

o - -

2- 161-750 12.3-250 -

27.5 34 -

c 1 - c - - -

  • 85 161-750 12.3-250 -

27.5 34 -

c 1 - c - o -

89 135- 64- 12- 50 1 - T - 3 c - - -

  • 90 138- 34.5- -

25 10 -

c - 3 c -

o - -

91 135- 13.5- -

7.5 - -

c - 3 c - - - e 92 132- 76.2- 34 65- - 60 8 -

c - 3 - -

o - -

93 132 550 34.5-200 12.47-110 3C - - c - 3 c - o -

94  !!S- 34.5 - 7.5 6 -

c - 3 c -

o . -

75 115-350 24-150 -

30 12 -

c - 3 c -

o -

96 115- 15 -

40 8 -

e - - - - -

  • 97 115-550 13.8-110 -

12.5 32 c - 3 c o - -

98 115 550 13.8-110 -

12.5 35 c 3 c -

o -

99 115- 13.5- -

20 2 -

c 3 e - -

  • 100 115- 13.5- - 20 21 -

c - 3 c - - - =

101 115- 13- -

25 17 c - 3 e . .

1C2 110- / 6- 12.47- 30 15 -

c - 3 c -

o . -

103 110-550 13.5-110 4 40 -

c 4 - c - -

104 110-550 13.8 110 -

4 40 - c i - c - - -

105 110-550 13.8 110 -

4 40 -

c 1 - c - - - -

106  !!O- 13.2- -

28 10 -

c - 3 c -

o +

  • 107 69- 25- - 10 2 -

c - 3 c - - -

  • 108 69- 25- - 7.5 1 -

c - 3 c - - -

  • 109 69- 13.2- 10.5 2 c - 3 -

r o - -

110 69- 13.2 - 10.5 2.5 c - 3 . t o - -

111 69-350 13.09-110 -

7.5 25 -

c -

3 e -

o - -

  • s = shell; c = core
  • c = circular coils; r - rectangular coils
  • o = coil failure: + = core failure; * = other failure Deads, etc.)

l l

TRTOO E db -

~

w.n . -- .. .,.... ., w ..: .-- r .:_ . .. .. - .: a .ll

. .s .

t .. .

~

1982 YEARLY TRANSFORMER FAILURE SURVEY Fdlire kV-Rated BIL Coil Failure N s. H L T MVA Age-yrs. Form

  • Phase Design Mode 112 69- 12 47. - 12 15 - c - 3 c - o - -

113 69- 12.47 - 30 26 - c - 3 c - o - -

114 69- 12.47 - 7 18 - c - 3 c - o - -

115 69- 4.16 - 5.0 27 - c - 3 c - o + -

116 67- 13.8- - 15 20 - c - 3 e - o - -

11- 67.2- 416- - 0.833 53 - c 1 - c - o - -

til 67-350 13.2 110 - 25 12 -

c - 3 c - o - -

119 67- 13.09- - 1.25 27 - c I - c - o - -

120 67- 12 47- - 5 19 - c - 3 c - o - -

67 4.16- - 2.5 19 - c 1 - c - - -

  • 121 .

122 66- 25 - 10 50 - c 1 - c - o - -

123 63-350 11 110 - 7.5 50 - c - 3 e - - -

  • 124 45- 13 -

15 23 - c - 3 e - o - -

125 36- 4.16- - 1.6 46 - c 1 - c - - - -

126 34.5-200 13 09-110 - 10 2 - c - 3 e - o - -

127 34.5- 12 -

7.5 11 - c - 3 c - - -

  • 125 34.5- 11- - 7.5 9 - c - - c - - -
  • 12* 26- 4 60 s - 1 - - - o - -

130 22.9-115 12 47-110 - 1.5 24 - c - 3 c - o - -

131 13 8-110 2.4-75 - 1.5 25 - c - 3 c - - - -

132 13 2- 4 36 - 2.5 26 - c - 3 c - o - -

133 416- 480- - 2 - . c - 3 c - o - -

134 4.1 480- - 2 8 - c - 3 - - o - -

135 - - - 420 10 - c - 3 c - o - -

136 88- 15.2- 7.5 14 -

c - 3 - - o - -

137 20- 3.5- 10 39 - c - 3 - - o - *

13) 46- - - -

2 - c - 3 e - o -

161- 64- 10.5- 40 - - c - 3 c - - - =

139 140 138-550 36.2-200 - 15 3 - c - 3 sc - o - -

141  !!5-350 13.2 110 - 10 5 - c - 3 c - - - a 142 230-750 34.5-200 -

30 8 - c - a c - c - - A 143 6o- 13.8- - 4 24 - c - 3 e - o - -

6 144 145 35-230-650 10 36.5-200 5 18 150 12 c

c 3 e 3 c o

a g

g 14e 230-650 36 5-200 - 150 12 - c - 3c - o - -

147 230-650 36.5-200 - 84 8 - c - 3 e - o . -

14E 230- 22.5- - 850 5 s - - 3 - r o - -

14u 139.2- 34.5- -

100.8 11 - c - 3 c - - - e 15e 139.2- 34 5- -

67.2 18 - c - 3 c - - - e 151 138 550 69-350 13.2 110 30 9 -

c - 3 - - c - -

152 136- 34.5- - 83 11 s - - 3 c - o - =

153 13 - 25- 11 90 4 5 - - 3 - r - + -

154 138- 69- 34.5- 115 10 - c - 3 c - o - -

155 135- 34.5- - 50 9 - c - 3 c -

o - -

156 115- 34.5- 13.5- 26 11 -

c - 3 e - . .

157 115- 14- - 50 14 - c - 3 c - o -

155 115- 13.8- - 30 1 - c - 3 c - - - e 15c 110-450 69-350 - 15 32 - c - 3 c - . -

  • 160 110- 13.8- - 33.3 12 .- c - 3 c - o . --

161 69-350 12-150 - 14 10 - c - 3 c - - -

  • 163 43.8-150 43.8-250 - 28 4 - c - 3 e - - - p 164 34.4-200 4.16- -

5.25 10 - - - 3 e - - -

  • 165 13- 11- - 5 20 - c - 3 c - o - .
  • s = shell; c = core
  • c = circular coits; r rectaripular coils
  • o = coil failure; r = core failure; * = other failure ticads, etc.)
m. A

b N, _

_. u - . N _m u .~.u; __ . 2 .. . .

, 1982 YEARLY TRANSFORMER FAILURE' SURVEY'ev l

l Failure kV Rated BIL Coil Failure '

~

N o. H L T MVA A e yrs. Form

  • Phase Design Mode 16e 144- 72- 25- 15 10 - -

3 - - - -

  • 167 144- 25- 4.16- 10 6 - - - - - - o - -

168 141.6-550 13.8 110 7.6- 42 21 -

c - 3 c - - -

  • 169 141.6-550 13.8-110 7.6- 42 10 - c - 3 c - - -
  • 170 _ 138- 34.5 13.8 160 21 - c - 3 c - - -

24 27 -

c - 3 e - o - -

172 115- 13 8- -

24 11 - c - 3 c - - - -

173 67-350 13.2 110 -

25 15 -

c - 3 e -

o - -

174 67- 13.09- -

18 15 -

c - 3 c - o - -

175 67- 13.09- -

1.66 29 -

c 1 - c -

o -

3.333 34 -

c 1 - c' - - - -

177 66-350 33-200 -

3.333 34 -

c 1 - c - - - -

178 45- IF -

12 17 - c - 3 c -

o - -

179 43.5- 13.09- -

7.5 14 -

c - 3 c -

o -

  • 180 36- 13.8- -

30 18 -

c - 3 - - - .

  • 181 35- 13 -

3 33 -

c 1 - c -

o - -

182 34 4- 13.2- -

13 44 15 -

c - 3 c -

o - -

183 34 4. 13.2- 13.44 17  : - 3 c

- - - o . .

164 34 4- 4.36- 11.2 12 c - 3 c

- - - o - -

185 138 550 69-350 13.09-150 21 18 -

c - 3 e - o - -

186 110- 44. 12.47- 33.3 16 3 e s - - -

c - -

187 110- 13.09- -

7.5 13 c - 3 c o - -

188 69-350 23-150 -

7.5 19 -

c - 3 e -

o - -

184 64- 13.8- -

30 - -

c - 3 - - . .

20 14 -

c - 3 c -

o - -

191 60-350 12.5-110 .

8. . 20 -

c - 3 e - o - -

192 23C- 44- -

125 10 -

c - 3 - - - -

6 17 -

c - 3 e - - -

  • 194 24-150 4.16-75 - 10 22 c -

3 e . - - .

195 13.8-50 4.16-25 3 7 c - 3 e -

o - -

19c 138-350 34.5-150 -

18 2 -

c - 3 e -

o - -

197 138-350 34.5-150 18 18 m c - 3 c -

o -

  • 198 67 350 4 16-75 -

20 1 -

c - 3 e .

o . -

199 23- 480- -

3 13 .

e . 3 . -

o . -

200 46- 7.2 - -

1 66" 8 3 -

o - -

201 230- 135- 250 (1 -

c - 3 c - ~- .

  • 202 69- 1.L -

28 16 3 c c - -

c - .

203 34 5- 13.5- -

.5 - -

e - 3 c - . . .

204 34.5- 13.0C. -

7 12 -

c - 3 e i o . -

205 34 4-200 4.3-200 -

9.375 15 c - 3 e o - -

20e 120-450 13.2-110 84 9 c - 3 e .

o . .

207 13.8-110 4.16-75 -

3.5 5 -

c . 3 e . . .

208 4 16- . 4&- .5 5 .

c - 3 c . .

209 500-1300 230-650 -

448 4 -

c I e - - - -

210 34.5- 13b- -

5 - . c - 3 c - - - ,

211 138 550 69-350 13.2-110 60 8 -

c - 3-c -

o . -

212 138-550 69-350 13.2 110 60 13 -

c - 3 c -

o . -

213 138-550 69-350 13.2 110 60 13 c - 3 e o - .

214 138-550 69-350 13.2 110 30 14 c 3 e o . -

215 115- 12.47- 7.2- 25 18 -

c -

3 c -

o . -

216 69- 12.47- .

25 12 c -

3 e -

o - .

217 69- 12.47- -

25 12 - c - 3 e .

o . .

218 34.4- 4.36- -

5.6 17 c -

3 c -

o + -

  • s = she!!; e = core
  • c = circular coils; r - rectanFular coils
  • o = coil failure; + = core failure; * = other failure (leads etc.1
i. TORSioW A Ab-

Oc. - 5 _ ._ ; . _ - ---

._.=.

. L._ . _ , . . , - -

, 1982 YEARLY TRANSFORMER FAILURE SURVEY Failrre kV-Rated BIL Coll Fallem N 3. H L T MVA Ase yrs- Fore

  • Phase Desisa Mode 219 344- 4.36- -

11.2 IS ' - c - 3 c - o + -

220 34 4- 13.2- - 10 20 - c - 3 c - o + -

221 34- 4- - 7.5 - - - - - - - - - -

222 765- 145- 34.5- 500 9 s - 1 - - - o - -

223 765- 345- 34.5- 500 9 s - 1 - - - o - -

224 --

500- 22- - 369.6 8 s - 1 - - - o -

  • 225 500- 22- - 369 6 9 s - 1 - - r - -
  • 226 500- 22- - 369.6 9 5 - 1 - - r - - #

227 345- 115- 13.8- 74 17 s - - 3 c - o - -

225 345-900 23-150 - 725 14 s - -

3 c - o - -

229 161- 115- 13.5- 187 3 - c - 3 - - - -

  • 230 157- 69- - 30 11 - c - 3 c - - -
  • 231 139.2- 34.5- - 5.6 17 - c - 3 e - - -
  • 232 138-550 13.8 110 - 12 16 s - - 3 c - o - -

233 138-550 13.09-110 - 12 14 - c - 3 e - o - -

234 120-450 13.2 110 - 16.8 24 - c - 3 'c - - -

  • 235 120-450 13.2 110 - 16.8 - - c - 3 c - - -
  • 23e 120-450 13.2 110 - 16.8 24 - c - 3 c - - -
  • 237 115-450 57-450 12.5-110 33.3 30 s - - 3 e - o - -

238 115-550 37.5 200 13.2 110 50 26 s - - 3 - r o - -

239  !!S- 34.5- - 40 25 s - - 3 - r - -

  • 240 115-450 23.5-150 -  !$ 17 - c - 3 e - o -

241 115- 22- -

12 12 - c - 3 e - o - -

242  !!5-350 13.2 110 - 56 11 -

c - 3 e - o - -

243  !!5-350 13.2-110 - 7 13 -

c 3 c - o . -

244 115-450 13.2-110 -

22A 18 - c - 3 e -

c -

245 115 4.36 -

12 15 - c - 3 e -

o - -

246 113- 13.5- -

12 - - - - 3 - - - -

  • 247 70.6- 13.5- -

7.5 56 -

c - 3 c - c - -

243 69-350 24 94-150 -

7.5 15 -

c - 3 e -

o - -

249 6c- 13.8- -

.833 53 - c  ! - c - o - -

250 67-350 13.2-110 -

9.375 - - c - 3 c - o - -

251 6c- 13.0c- -

5.6 12 -

c - 3 c - o - -

252 6c- 12.47- -

12 19 -

c - 3 c - o - -

253 67- 13 .

.5 27 -

c I - c - c - -

254 66 550 34 5- - 6 667 -

s - 1 - c -

o - -

255 66-350 13.09-110 -75 28 12 -

c - 3 c - o - -

25f do- 13.2- - 20 14 - c - 3 c - o -

25- 46- 2.4 - 1 - - c l - c - o - -

258 34.5- 34.5- -

120 10 - c - 3 c - e 259 34.5- 13.09- -

10.5 9 - c - 3 c -

o -

260 34.5- 12- -

5 12 -

c - 3 e -

o - -

261 34.5- 12- -

5 14 - c - 3 c -

o - -

262 34.5- 12- -

5 17 - c - 3 c - o - -

263 34.5- 12- -

.833 13 -

c 1 - c - o - -

264 34 4- 4.365- -

10 33 s - - 3 - r c - -

1 265 34.5- 4- -

3 75 30 m - c - 3 - r o - - l 266 34.5- .480- - 2.5 6 rr. - c -

3 c - - -

  • l 267 34- 34- - 250 9 s - - 3 - - - - -

268 34- 12- - 6.25 - - - - - - - - - -

269 34- 12 - 6.25 - - - - - - - - - -

270 33 S- -

6.25 28 -

c - 3 c - - + -

271 25.2- 13.09-7.56 -

7 13 -

c - 3 - r o - -

272 25- 4- -

2.5 23 - c - 3 c - o - - I 273 25- 4- - 2.5 23 - c - 3 e - o - -

274 25- 4- - 2.0 25 - c - 3 c -

o - -

  • s = shell; e = core

'c = circular coits; r - rectarigular coils

  • o = coil failure; + = core failure; * = other failure (leads, etc.I TRTO83

,_;_-___7__-_-__ _

==. - -- -~= ::- .:. - . :..'.K = ' . : . : . - =.-. c :: ~~~-r.==. -- -.=--- -& u - - :.'2 -? --- - -- - - -- - - ..,.----;

.-.q.... .

....4..

,..... ......, -..-.----%-- - . . . . . . ..~%-. - ..-- . . - . . . . . . . . . . .

-* 1982 YEARLY TRANSFORf1ER FAILURE SURVEY Fall:re kV. Rated-BIL Coil Failure

% H L T MVA Age-yrs. Form' Phase Design Mode

!?5 25- 4- . 2.5 25 -

c - 3 e -

o - .

276 23- 12.5- - 5.0 7 - c - 3 c - o - a 277 23- 12.5- . 3.75 20 - c - 3 e . o - -

278 22.9- 12.47

. $ 11 . c . 3 . r o - -

279 ,

16- 4.16- . 12 10 . c . 3 e . . . #

280 14 4- .480- . I 1 -

c - 3 . . o . -

281 13.5- 4.16- - 5.25 54 . c - 3 e . .~- e 282 13.2- 44- . 7.5 25 . c - 3 c . . . .

283 11- 2.3- . 8 35 - c - 3 c . . . *

  • s = shell; c = core

'c = circular coik: r . rectangular coih

'o = coil failure: * = core failure: * = other failure (leads etc ), .

To35if6Tra d . . . A LN