1 PJH Charlotte, NC March 18, 2008 Liquid Dielectric Test Tables Task Force (C57.12.00) Rev 17 Porto, Portugal October 7, 2008

1PJH Charlotte, NC March 18, 2008

Liquid Dielectric Test TablesTask Force (C57.12.00) Rev 17

Porto, PortugalOctober 7, 2008

User


AGENDA1. Introductions

2. Mission & Scope

3. Minutes & Review from March Charlotte Meeting

4. Document StatusA. Present FormB. C57.12.00R with proposed Text revisions

6. Future Considerations: Propose disbanding Taskforce

7. Discussion and Adjournment

Liquid Dielectric Test Tables

Task Force (C57.12.00)


Liquid Dielectric Test TablesTask Force (C57.12.00)


• Clean Up Inconsistencies• Harmonize with IEC 76-3• Provide Reference Considerations• Simplify Tables

Mission & Scope



IEEE C57.12.00/12.01/IEC 76-3 Dielectric Test Tables Survey Tally

Number Person Approve Approve with Abstain Disapprove Date Comment TypeLast Name First Name Comments with comments ED Tech

1 Mcnelly Sue 3 1/2/2008 32 Kraetge Alexander 1 1/25/20083 Molden Art 3 1/28/2008 34 Poulin Bertrand 1 1/3/20085 Patel Bipin 4 1/9/2008 46 Britton Jeffrey 1 1/2/20087 Garner Charles 1 1/29/20088 Harley Jack 1 1/2/20089 Henning Bill 1 1/24/2008 110 Guardado Jeremy 1 1/3/200811 Corkran Jerry 1 1/14/2008 112 Graham Jim 1 1/9/200813 Foldi Joe 3 1/14/2008 2 114 Matthews John 1 1/24/200815 Thierry Juan 1 1/28/200816 Miller Kent 1 1/2/200817 Sampat Mahesh 1 1/3/2008 118 Riffon Pierre 7 1/24/2008 4 319 Recksiedler Leslie 1 1/2/200820 Riboud Jean-Christoff 2 1/2/2008 221 Hayes Roger 1 1/24/2008 122 Tuli Subhash 5 1/9/2008 2 323 Wagenaar Loren 1 1/24/2008 124 Boettger William 1 1/29/200825 Hopkinson Phil 1 1/30/200826 Choinski Scott 1 1/30/200827 Perkins Mark 3 1/30/2008 328 Forsyth Bruce 1 1/30/2008 129 Kim Dong 1 1/31/200830 Snyder Steve 10 1/31/2008 6 431 Garcia Eduardo 1 1/31/200832 Davis Eric 5 1/31/2008 533 Frimpong George 1 1/31/200834 Preininger Gustav 1 1/13/2008 135 Elliott Fred 1 2/1/200836 Platts Don 1 2/6/2008

15 29 3 24 32 20


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


Table 4: Distribution and Class I Transformers, voltages in kVMax Sytem Nominal System Applied Test Induced Test (phase to ground) Winding Line-end BIL Neutral BIL

Voltage Voltage Delta & Fully Gr Y Impedance 2 times Min. Alternates GrY Impedance Insulated Gr Y Nominal Voltage 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

Distribution Transformers1.5 1.2 10 - 10 1.4 30 30 303.5 2.5 15 - 15 2.9 45 45 456.9 5 19 - 19 5.8 60 60 6011 8.7 26 - 26 10 75 75 7517 15 34 - 34 17 95 110 75 7526 25 40 - 40 29 125 150 75 9536 34.5 50 - 50 40 125 150 200 75 12548 46 95 - 70 53 200 250 95 15073 69 140 - 95 80 250 350 95 200

Class I Power Transformers1.5 1.2 10 10 10 1.4 30 45 30 303.5 2.5 15 15 15 2.9 45 60 45 456.9 5 19 19 19 5.8 60 75 60 6011 8.7 26 26 26 10 75 95 75 7517 15 34 26 34 17 95 110 75 7526 25 50 26 40 29 150 75 9536 34.5 70 26 50 40 200 75 12548 46 95 34 70 53 200 250 95 15073 69 140 34 95 80 250 350 95 200

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 2.0* Nominal voltage.2 Bold typeface BIL's are the most commonly used standard levels 3 Y-Y connected transformers using a common solidly grounded neutral may use neutral BIL selected in accordance with the

low voltage winding rating.


Table 5: Class II Power Transformers, voltages in kV Max Nominal Applied Test Induced Test (phase to ground) Winding Line-end BIL Neutral BIL

System System Delta & Fully Gr Y Impedance Enhanced One Hour Min. Alternates Gr Y ImpedanceVoltage 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 11036 34.5 70 26 50 41 32 200 110 12548 46 95 34 70 55 42 200 250 110 15073 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 250145 138 207 34 95 145 125 450 550 650 110 250169 161 242 34 140 170 145 550 650 750 825 110 350242 230 345 34 140 240 210 650 750 825 900 110 350362 345 518 34 140 360 315 900 1050 1175 110 350550 500 N/A 34 140 550 475 1425 1550 1675 110 350765 735 N/A 34 140 850 750 1950 2050 110 350800 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.

2 Bold typeface BIL's are the most commonly used standard levels3 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.


Table 6: High Frequency Test TablesLightning Chopped Wave Switching

Impulse (BIL) kV Crest Min. Time to Flashover, μs ImpulsekV Crest, 1.2x50 μs 1.1 X BIL Class I & Dist Class II kV Crest

Col 1 Col 2 Col 3 Col 4 Col 5

30 33 1.0 2.0 -45 50 1.5 2.0 -60 66 1.5 2.0 5075 83 1.5 2.0 6295 105 1.8 2.0 79

110 120 2.0 2.0 92125 138 2.3 2.3 104150 165 3.0 3.0 125200 220 3.0 3.0 166250 275 3.0 3.0 208350 385 3.0 3.0 291450 495 N/A 3.0 375550 605 N/A 3.0 460650 715 N/A 3.0 540750 825 N/A 3.0 620825 900 N/A 3.0 685900 990 N/A 3.0 745

1050 1155 N/A 3.0 8701175 1290 N/A 3.0 9751300 1430 N/A 3.0 10801425 1570 N/A 3.0 11801550 1705 N/A 3.0 12901675 1845 N/A 3.0 13901800 1980 N/A 3.0 15001950* 2145 N/A 3.0 1550/1620*2050 2255 N/A 3.0 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


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 longerspecified but is documented for historical purposes

Lightning Front Of WaveImpulse (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 75 0.5 12545 75 0.5 12560 125 0.5 21075 165 0.5 21095 165 0.5 275

110 195 0.5 430125 220 0.5 430150 260 0.5 430200 345 0.5 575250 435 0.5 725350 580 0.58 850450 710 0.71 850550 825 0.825 850650 960 0.96 850750 1070 1.07 850825 1150 1.15 850900 1240 1.24 850

1050 1400 1.4 8501175 1530 1.53 8501300 - - -1550 - - -


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.


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.


Summary of Blume’s Dielectric Relationships of Test Valves to System Voltage in 1937

1. Low Frequency

2. High Frequency

1 Minute withstand voltageInfinite time withstand voltage

1.5

Full wave withstand 1.5 x 40µsec60 Hz withstand

2.2 - 3.0

1 time Full wave withstandMultiple strokes

1.25

(Page 388*)

(Page 473*)

(Page 476*)

*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.


Minimum BIL Selection from Surge Arrester Characteristics

V1

V2

Arrester protection level

V arrester protection level to VMX L-G

From Blume: Minimum BIL = 1.25 X V2

VMX L-G


Nominal Nominal DutyShielding System System Cycle MCOV Discharge Vrev.@ Vrev./.75*1.25 Vrev*1.25 Discharge Vrev.@ Vrev./.75*1.25 Vrev*1.25Practice Vols kV(L-L) Vols kV(L-G) Volts kV rms 10kA 10kA 40kA 40kA

1.2 0.69 3 2.55 8.00 8.98 14.97 10.30 11.28 18.802.5 1.44 3 2.55 8.00 10.04 16.73 10.30 12.34 20.575 2.89 6 5.10 15.80 19.88 33.14 20.30 24.38 40.64

Unshielded 8.7 5.02 9 7.65 23.50 30.60 51.00 30.20 37.30 62.17Systems 15 8.66 12 10.20 31.40 43.65 72.74 40.40 52.65 87.74

25 14.43 18 15.30 47.10 67.51 112.52 84.39 60.60 81.01 135.02 101.2634.5 19.92 27 22.00 67.70 95.87 159.78 119.83 87.00 115.17 191.94 143.9646 26.56 36 29.00 98.20 135.75 226.26 169.69 115.00 152.55 254.26 190.6969 39.84 54 42.00 122.00 178.33 297.22 222.91 151.00 207.33 345.55 259.16

115 66.40 90 70.00 202.00 295.89 493.14 369.86 251.00 344.89 574.81 431.11138 79.68 108 84.00 243.00 355.66 592.77 444.58 301.00 413.66 689.44 517.08

Shielded 161 92.96 120 98.00 283.00 414.44 690.73 518.05 351.00 482.44 804.07 603.05Systems 230 132.79 172 140.00 404.00 591.77 986.29 739.71 502.00 689.77 1149.62 862.21

345 199.19 258 209.00 604.00 885.66 1476.10 1107.07 752.00 1033.66 1722.76 1292.07500 288.68 304.00 850.00 1258.20 2097.00 1572.75 1000.00 1408.20 2347.00 1760.25765 441.69 462.00 1290.00 1914.54 3190.91 2393.18 1520.00 2144.54 3574.24 2680.68

SHIELDED SYSTEM UNSHIELDED SYSTEM

Grounded Wye-Connected Arresterd Application ChartIn Accordance with C62.2 Methods

Courtesy of Mike Comber, Ohio Brass Co.Rev.: 0 Date: 11/2/99

1) Shielded Systems use 10 kA discharge voltage protection levels2) Unshielded Systems use 40 kA discharge voltage protection levels3) 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.


Delta-Connected Arresterd Application ChartIn Accordance with C62.2 Methods

Courtesy of Mike Comber, Ohio Brass Co.Rev.: 0 Date: 11/2/99

Nominal Nominal DutyShielding System System Cycle MCOV Discharge Vrev.@ Vrev./.75*1.25 Vrev*1.25 Discharge Vrev.@ Vrev./.75*1.25 Vrev*1.25Practice Vols kV(L-L) Vols kV(L-G) Volts kV rms 10kA 10kA 40kA 40kA

1.2 0.69 3 2.55 8.00 8.98 14.97 10.30 11.28 18.802.5 1.44 3 2.55 8.00 10.04 16.73 10.30 12.34 20.575 2.89 6 5.10 15.80 19.88 33.14 20.30 24.38 40.64

Unshielded 8.7 5.02 12 10.20 31.40 38.50 64.17 40.40 47.50 79.17Systems 15 8.66 18 15.30 47.10 59.35 98.91 60.60 72.85 121.41

25 14.43 36 29.00 89.20 109.61 182.68 137.01 115.00 135.41 225.68 169.2634.5 19.92 45 36.50 113.00 141.17 235.28 176.46 146.00 174.17 290.28 217.7146 26.56 60 48.00 139.00 176.55 294.26 220.69 173.00 210.55 350.92 263.1969 39.84 90 70.00 202.00 258.33 430.55 322.91 251.00 307.33 512.22 384.16

115 66.40 144 115.00 332.00 425.89 709.81 532.36 413.00 506.89 844.81 633.61138 79.68 172 140.00 404.00 516.66 861.10 645.83 502.00 614.66 1024.44 768.33

Shielded 161 92.96 228 180.00 520.00 651.44 1085.73 814.30 645.00 776.44 1294.07 970.55Systems 230 132.79 312 245.00 708.00 895.77 1492.95 1119.71 878.00 1065.77 1776.29 1332.21

345 199.19 340.00 950.00 1231.66 2052.76 1539.57 1118.00 1399.66 2332.76 1749.57500 288.68765 441.69

SHIELDED SYSTEM UNSHIELDED SYSTEM

1) Shielded Systems use 10 kA discharge voltage protection levels2) Unshielded Systems use 40 kA discharge voltage protection levels3) 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.


Porcelain Housed Station Class Arresters


DynaVar Type VH5 Heavy DutyStation Class Gapped Metal-Oxide Surge Arresters

(Double Column of Value Elements)

Maximum MaximumContinuous Maximum SwitchingOperating 10-Second 0.5 us SurgeVoltage Voltage Discharge Discharge(MCOV) Rating Voltage VoltagekV rms kV kV (1) (kV (2) 5 kA 10 kA 20 kA 40 kA

304 378 1023 738 806 850 905 1000318 396 1070 774 843 890 947 1046340 420 1142 825 500 950 1012 1118462 576 1596 1120 1223 1290 1380 1520

Maximum Discharge Voltageusing an 8 x 20 usCurrent 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.


BACKGROUND INFORMATIONGeorge Iliff Reference (Bonneville Power)

Low Frequency Tests - Induce and Applied

Figure 1 - Voltage Relationhips on faulted windings

V Test = 2 x V system

A - NORMAL B - FAULT ON UNGROUNDED SYSTEM

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.

100%

H2

58%G

H3H1

H2

H3H1

G

R

N100% 58%

H2

H3H1

G

58% R = O


Low Frequency Test Comparison



High Frequency Test Comparison


Documents

1 PJH Charlotte, NC March 18, 2008 Liquid Dielectric Test Tables Task Force (C57.12.00) Rev 17 Porto, Portugal October 7, 2008