Liquid Dielectric Test Tables
Task Force (C57.12.00) Rev 17
Porto, Portugal
October 7, 2008
PJH Charlotte, NC March 18, 2008
1
Liquid Dielectric Test Tables
Task Force (C57.12.00)
AGENDA
1. Introductions
2. Mission & Scope
3. Minutes & Review from March Charlotte Meeting
4. Document Status
A. Present Form
B. C57.12.00R with proposed Text revisions
6. Future Considerations: Propose disbanding Taskforce
7. Discussion and Adjournment
PJH Charlotte, NC March 18, 2008
2
Liquid Dielectric Test Tables
Task Force (C57.12.00)
PJH Charlotte, NC March 18, 2008
3
Liquid Dielectric Test Tables
Task Force (C57.12.00)
Mission & Scope
• Clean Up Inconsistencies
• Harmonize with IEC 76-3
• Provide Reference Considerations
• Simplify Tables
PJH Charlotte, NC March 18, 2008
4
IEEE C57.12.00/12.01/IEC 76-3 Dielectric Test Tables Survey Tally
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Person
Last Name
Mcnelly
Kraetge
Molden
Poulin
Patel
Britton
Garner
Harley
Henning
Guardado
Corkran
Graham
Foldi
Matthews
Thierry
Miller
Sampat
Riffon
Recksiedler
Riboud
Hayes
Tuli
Wagenaar
Boettger
Hopkinson
Choinski
Perkins
Forsyth
Kim
Snyder
Garcia
Davis
Frimpong
Preininger
Elliott
Platts
PJH Charlotte, NC March 18, 2008
Approve
First Name
Sue
Alexander
Art
Bertrand
Bipin
Jeffrey
Charles
Jack
Bill
Jeremy
Jerry
Jim
Joe
John
Juan
Kent
Mahesh
Pierre
Leslie
Jean-Christoff
Roger
Subhash
Loren
William
Phil
Scott
Mark
Bruce
Dong
Steve
Eduardo
Eric
George
Gustav
Fred
Don
Approve with
Comments
3
Abstain
Disapprove
with comments
1
3
1
4
1
1
1
1
1
1
1
3
1
1
1
1
7
1
2
1
5
1
1
1
1
3
1
1
10
1
5
1
1
1
1
15
29
3
24
Date
Comment Type
ED
Tech
1/2/2008
3
1/25/2008
1/28/2008
3
1/3/2008
1/9/2008
4
1/2/2008
1/29/2008
1/2/2008
1/24/2008
1
1/3/2008
1/14/2008
1
1/9/2008
1/14/2008
2
1
1/24/2008
1/28/2008
1/2/2008
1/3/2008
1
1/24/2008
4
3
1/2/2008
1/2/2008
2
1/24/2008
1
1/9/2008
2
3
1/24/2008
1
1/29/2008
1/30/2008
1/30/2008
1/30/2008
3
1/30/2008
1
1/31/2008
1/31/2008
6
4
1/31/2008
1/31/2008
5
1/31/2008
1/13/2008
1
2/1/2008
2/6/2008
32
20
5
IEEE C57.12.00/12.01/IEC 76-3 Dielectric Test Tables:
•New Proposed C57.12.00 Sections 5.5-5.10
•Comments and Proposed Disposition
PJH Charlotte, NC March 18, 2008
6
Table 4:
Distribution and Class I Transformers, voltages in kV
Max Sytem
Voltage
Nominal System
Voltage
Col 1
Col 2
Applied Test
Delta & Fully
Gr Y Impedance
Insulated
Gr Y
Col 3
1.5
3.5
6.9
11
17
26
36
48
73
1.2
2.5
5
8.7
15
25
34.5
46
69
10
15
19
26
34
40
50
95
140
1.5
3.5
6.9
11
17
26
36
48
73
Notes:
1
1.2
2.5
5
8.7
15
25
34.5
46
69
10
15
19
26
34
50
70
95
140
2
3
Col 4
Induced Test (phase to ground)
2 times
Nominal Voltage
Col 5
Distribution Transformers
10
15
19
26
34
40
50
70
95
Class I Power Transformers
10
10
15
15
19
19
26
26
26
34
26
40
26
50
34
70
34
95
Winding Line-end BIL
Min.
Alternates
Col 6
Col 7
1.4
2.9
5.8
10
17
29
40
53
80
30
45
60
75
95
125
125
200
250
1.4
2.9
5.8
10
17
29
40
53
80
30
45
60
75
95
150
200
200
250
Col 8
110
150
150
250
350
45
60
75
95
110
250
350
Col 9
200
Neutral BIL
GrY Impedance
Gr Y
Col 10 Col 11
Col 12
30
45
60
75
75
75
75
95
95
30
45
60
75
75
95
125
150
200
30
45
60
75
75
75
75
95
95
30
45
60
75
75
95
125
150
200
For Nominal System Voltage greater than Maximum System Voltage use the next higher voltage class for applied test levels.
Induced tests shall be conducted at 2.0* Nominal voltage.
Bold typeface BIL's are the most commonly used standard levels
Y-Y connected transformers using a common solidly grounded neutral may use neutral BIL selected in accordance with the
low voltage winding rating.
PJH Charlotte, NC March 18, 2008
7
Table 5:
Class II Power Transformers, voltages in kV
Induced Test (phase to ground)
Max Nominal
Applied Test
Winding Line-end BIL
Neutral BIL
System System Delta & Fully Gr Y Impedance
Enhanced
One Hour
Min.
Alternates
Gr Y
Impedance
Voltage Voltage
Insulated
Gr Y
7200 cy.
Gr Y
Col 1
Col 2
Col 3
Col 4
Col 5
Col 6
Col 7
Col 8
Col 9 Col 10 Col 11 Col 12
Col 13
Low Voltage Windings (69 kV and lower)
<=17
<=15
34
26
26
20
15
110
110
110
26
25
50
26
34
29
24
150
110
110
36
34.5
70
26
50
41
32
200
110
125
48
46
95
34
70
55
42
200
250
110
150
73
69
140
34
95
81
63
250
350
110
200
High Voltage Windings (115 kV and higher)
121
115
173
34
95
120
105
350
450 550
110
250
145
138
207
34
95
145
125
450
550 650
110
250
169
161
242
34
140
170
145
550
650 750 825 110
350
242
230
345
34
140
240
210
650
750 825 900 110
350
362
345
518
34
140
360
315
900 1050 1175
110
350
550
500
N/A
34
140
550
475
1425 1550 1675
110
350
765
735
N/A
34
140
850
750
1950 2050
110
350
800
765
N/A
34
140
885
795
1950 2050
110
350
Notes:
1
For Nominal System Voltage greater than Maximum System Voltage use the next higher voltage class for applied test
levels. Induced tests shall be conducted at 1.58 * Nominal voltage for one hour and 1.80 * Nominal voltage
for enhanced 7200 cycle tests.
Bold typeface BIL's are the most commonly used standard levels
2
3
Y-Y connected transformers using a common solidly grounded neutral may use neutral
BIL selected in accordance with the low voltage winding rating.
4
For 735kV to 800 kV nominal system voltages, induce test levels do not follow rules in Note 2, and 1950 kV BIL is not a standard IEEE level.
PJH Charlotte, NC March 18, 2008
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Table 6: High Frequency Test Tables
Lightning
Chopped Wave
Impulse (BIL)
kV Crest
Min. Time to Flashover, μs
kV Crest, 1.2x50 μs
1.1 X BIL
Class I & Dist
Class II
Switching
Impulse
kV Crest
Col 1
Col 2
Col 3
Col 4
Col 5
30
45
60
75
95
110
125
150
200
250
350
450
550
650
750
825
900
1050
1175
1300
1425
1550
1675
1800
1950*
2050
33
50
66
83
105
120
138
165
220
275
385
495
605
715
825
900
990
1155
1290
1430
1570
1705
1845
1980
2145
2255
1.0
1.5
1.5
1.5
1.8
2.0
2.3
3.0
3.0
3.0
3.0
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2.0
2.0
2.0
2.0
2.0
2.0
2.3
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
50
62
79
92
104
125
166
208
291
375
460
540
620
685
745
870
975
1080
1180
1290
1390
1500
1550/1620*
1700
Notes:
*For 1950 kV BIL, a Switching Impulse (BSL) of 1550 kV is a special application for transposed lines
to reduce switching impulse levels. For non-transposed lines, a Switching Impulse (BSL) of 1620 kV
shoule be used for the 1950 kV BIL
PJH Charlotte, NC March 18, 2008
9
Annex A (Informative)
The following table of Front-of-Wave insulation and test levels has been included for
information and historical benefit. The test levels in this table have come from past issues
of C57.12.00, dating back to earlier than 1965 through 1980 issues.
The Front Of Wave Test, Voltages in kV : Note that this test is no longer
specified but is documented for historical purposes
Lightning
Front Of Wave
Impulse (BIL)
kV Crest
Min. Time to
Min. effective
kV Crest, 1.2x50 μs
Flashover, μs Rate Of Rise, (kV/ μs)
Col 1
Col 2
Col 3
Col 4
30
45
60
75
95
110
125
150
200
250
350
450
550
650
750
825
900
1050
1175
1300
1550
75
75
125
165
165
195
220
260
345
435
580
710
825
960
1070
1150
1240
1400
1530
-
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.58
0.71
0.825
0.96
1.07
1.15
1.24
1.4
1.53
-
125
125
210
210
275
430
430
430
575
725
850
850
850
850
850
850
850
850
850
-
PJH Charlotte, NC March 18, 2008
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Table III Test Values For Repaired
Transformers
1.
Transformers in the field do not get impulse tests.
2.
Transformers that are returned to the factory with field
service are to be tested at 85% of the new values.
3.
Transformers that have minor repairs or where only
one coil is replaced generally are also tested to 85% of
the new values.
4.
Transformers where 2 or more coils are replaced are
generally tested to full rated values.
There is naturally a requirement for agreement between
purchaser and supplier.
PJH Charlotte, NC March 18, 2008
11
Future Direction for Taskforce:
1. Place Task Force on idle while
C57.12.00R is balloted.
2. Address issues in C57.12.00 that are
referred back to Taskforce.
3. Disband Taskforce at Spring 2009
meeting in Miami.
PJH Charlotte, NC March 18, 2008
12
Summary of Blume’s Dielectric Relationships
of Test Valves to System Voltage in 1937
1. Low Frequency
1 Minute withstand voltage
Infinite time withstand voltage
1.5
(Page 388*)
1.25
(Page 473*)
2.2 - 3.0
(Page 476*)
2. High Frequency
1 time Full wave withstand
Multiple strokes
Full wave withstand 1.5 x 40µsec
60 Hz withstand
*Transformer Engineering: A Treatise on the Theory, Operation and Application of Transformers By L.F. Blume,, G. Camilli, A. Boyajian and
V.M. Montsinger. © 1938 John Wiley and Sons, Inc.
PJH Charlotte, NC March 18, 2008
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Minimum BIL Selection from
Surge Arrester Characteristics
Arrester protection level
V1
V2
VMX L-G
V arrester protection level to VMX
L-G
From Blume: Minimum BIL = 1.25 X V2
PJH Charlotte, NC March 18, 2008
14
Grounded Wye-Connected Arresterd Application Chart
In Accordance with C62.2 Methods
Courtesy of Mike Comber, Ohio Brass Co.
Rev.: 0 Date: 11/2/99
Shielding
Practice
Unshielded
Systems
Shielded
Systems
Nominal
Nominal
Duty
System
System
Cycle
Vols kV(L-L) Vols kV(L-G) Volts kV
1.2
2.5
5
8.7
15
25
34.5
46
69
115
138
161
230
345
500
765
0.69
1.44
2.89
5.02
8.66
14.43
19.92
26.56
39.84
66.40
79.68
92.96
132.79
199.19
288.68
441.69
3
3
6
9
12
18
27
36
54
90
108
120
172
258
MCOV
rms
2.55
2.55
5.10
7.65
10.20
15.30
22.00
29.00
42.00
70.00
84.00
98.00
140.00
209.00
304.00
462.00
SHIELDED SYSTEM
Discharge Vrev.@ Vrev./.75*1.25
10kA
10kA
8.00
8.00
15.80
23.50
31.40
47.10
67.70
98.20
122.00
202.00
243.00
283.00
404.00
604.00
850.00
1290.00
8.98
10.04
19.88
30.60
43.65
67.51
95.87
135.75
178.33
295.89
355.66
414.44
591.77
885.66
1258.20
1914.54
14.97
16.73
33.14
51.00
72.74
112.52
159.78
226.26
297.22
493.14
592.77
690.73
986.29
1476.10
2097.00
3190.91
Vrev*1.25
84.39
119.83
169.69
222.91
369.86
444.58
518.05
739.71
1107.07
1572.75
2393.18
UNSHIELDED SYSTEM
Discharge Vrev.@
Vrev./.75*1.25
40kA
40kA
10.30
10.30
20.30
30.20
40.40
60.60
87.00
115.00
151.00
251.00
301.00
351.00
502.00
752.00
1000.00
1520.00
11.28
12.34
24.38
37.30
52.65
81.01
115.17
152.55
207.33
344.89
413.66
482.44
689.77
1033.66
1408.20
2144.54
18.80
20.57
40.64
62.17
87.74
135.02
191.94
254.26
345.55
574.81
689.44
804.07
1149.62
1722.76
2347.00
3574.24
Vrev*1.25
101.26
143.96
190.69
259.16
431.11
517.08
603.05
862.21
1292.07
1760.25
2680.68
1) Shielded Systems use 10 kA discharge voltage protection levels
2) Unshielded Systems use 40 kA discharge voltage protection levels
3) Transmission and subtransmission systems are shielded, having the neutral (ground) lead physically located above the line leads.
4) Distribution systems through 69 kV are normally unshielded with the neutral located below the line leads.
PJH Charlotte, NC March 18, 2008
15
Delta-Connected Arresterd Application Chart
In Accordance with C62.2 Methods
Courtesy of Mike Comber, Ohio Brass Co.
Rev.: 0 Date: 11/2/99
Shielding
Practice
Unshielded
Systems
Shielded
Systems
Nominal
Nominal
Duty
System
System
Cycle
Vols kV(L-L) Vols kV(L-G) Volts kV
1.2
2.5
5
8.7
15
25
34.5
46
69
115
138
161
230
345
500
765
0.69
1.44
2.89
5.02
8.66
14.43
19.92
26.56
39.84
66.40
79.68
92.96
132.79
199.19
288.68
441.69
3
3
6
12
18
36
45
60
90
144
172
228
312
MCOV
rms
2.55
2.55
5.10
10.20
15.30
29.00
36.50
48.00
70.00
115.00
140.00
180.00
245.00
340.00
SHIELDED SYSTEM
Discharge Vrev.@ Vrev./.75*1.25
10kA
10kA
8.00
8.00
15.80
31.40
47.10
89.20
113.00
139.00
202.00
332.00
404.00
520.00
708.00
950.00
8.98
10.04
19.88
38.50
59.35
109.61
141.17
176.55
258.33
425.89
516.66
651.44
895.77
1231.66
14.97
16.73
33.14
64.17
98.91
182.68
235.28
294.26
430.55
709.81
861.10
1085.73
1492.95
2052.76
Vrev*1.25
137.01
176.46
220.69
322.91
532.36
645.83
814.30
1119.71
1539.57
UNSHIELDED SYSTEM
Discharge Vrev.@
Vrev./.75*1.25
40kA
40kA
10.30
10.30
20.30
40.40
60.60
115.00
146.00
173.00
251.00
413.00
502.00
645.00
878.00
1118.00
11.28
12.34
24.38
47.50
72.85
135.41
174.17
210.55
307.33
506.89
614.66
776.44
1065.77
1399.66
18.80
20.57
40.64
79.17
121.41
225.68
290.28
350.92
512.22
844.81
1024.44
1294.07
1776.29
2332.76
Vrev*1.25
169.26
217.71
263.19
384.16
633.61
768.33
970.55
1332.21
1749.57
1) Shielded Systems use 10 kA discharge voltage protection levels
2) Unshielded Systems use 40 kA discharge voltage protection levels
3) Transmission and subtransmission systems are shielded, having the neutral (ground) lead physically located above the line leads.
4) Distribution systems through 69 kV are normally unshielded with the neutral located below the line leads.
PJH Charlotte, NC March 18, 2008
16
Porcelain Housed Station Class Arresters
PJH Charlotte, NC March 18, 2008
17
DynaVar Type VH5 Heavy Duty
Station Class Gapped Metal-Oxide Surge Arresters
(Double Column of Value Elements)
Maximum
Continuous
Operating 10-Second
Voltage
Voltage
(MCOV)
Rating
kV rms
kV
304
318
340
462
378
396
420
576
Maximum
0.5 us
Discharge
Voltage
kV (1)
Maximum
Switching
Surge
Discharge
Voltage
(kV (2)
5 kA
10 kA
20 kA
40 kA
1023
1070
1142
1596
738
774
825
1120
806
843
500
1223
850
890
950
1290
905
947
1012
1380
1000
1046
1118
1520
Maximum Discharge Voltage
using an 8 x 20 us
Current Wave - kV
1) Maximum discharge voltage for an impulse current wave which produces a voltage wave creating a 5 0.5 s.
Discharge currents are 15 kVA for 304=340 MCOV and 30 kA for 462 MCOV. This can be used for coordination
where front-of-wave sparkover formerly was used.
2) Discharge voltage of 3 kA for a surge of 45 s time to crest.
PJH Charlotte, NC March 18, 2008
18
BACKGROUND INFORMATION
George Iliff Reference (Bonneville Power)
Low Frequency Tests - Induce and Applied
V Test = 2 x V system
H2
100%
H1
H2
58%
G
H3
A - NORMAL
100% 58%
H1
H2
G
R
N
58%
H3
B -  FAULT ON
UNGROUNDED
SYSTEM
H1
G
R=O
H3
C -  FAULT ON
EFFECTIVELY
GROUNDED SYSTEM
NOTE: “G’ REFERS TO THE GROUND VOLTAGE AT THE TRANSFORMER,
RELATIVE TO THE LINE TERMINAL VOLTAGES. THIS DETERMINES THE
COLTAGE IMPOSED ON THE TRANSFORMER INSULATION.
PJH Charlotte, NC March 18, 2008
Figure 1 - Voltage Relationhips on faulted windings
19
Liquid Dielectric Test Tables
Task Force (C57.12.00)
Low Frequency Test Comparison
PJH Charlotte, NC March 18, 2008
20
Liquid Dielectric Test Tables
Task Force (C57.12.00)
High Frequency Test Comparison
PJH Charlotte, NC March 18, 2008
21