ansi design test report report no. eu1498-h … · ansi design test report ... 300729 29 36 18 52...

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ANSI DESIGN TEST REPORTReport No. EU1498-H-00

Type PVIA Intermediate ClassSurge Arrester

This report records the results of the design tests made on Type PVIA Intermediate Classsurge arresters in accordance with IEEE Standard C62.11-1999 “IEEE Standard for MetalOxide Surge Arresters for AC Power Circuits (> 1kV)”.

To the best of our knowledge and within the usual limits of testing practices, testsperformed on the Type PVIA arresters demonstrate full compliance with the relevantclauses of the referenced standard.

M.G. Comber Dennis W. Lenk P.E.Manager, Engineering Principal Engineer

Date: 2000-09-13

Separate reports provide details of the tests, according to the following table:Report No. Description Clause Issue Date

EU1498-H-01 Insulation Withstand 8.1 9/13/00EU1498-H-02 Discharge Voltage 8.3 9/13/00EU1498-H-03 Disc Accelerated Aging 8.5 9/13/00EU1498-H-04 Polymer Accelerated Aging 8.6 9/13/00EU1498-H-05 Contamination 8.7 9/13/00EU1498-H-06 Internal Ionization and RIV 8.9 9/13/00EU1498-H-07 High Current, Short Duration 8.10.1 9/13/00EU1498-H-08 Transmission Line Discharge 8.10.2 9/13/00EU1498-H-09 Duty Cycle 8.11 9/13/00EU1498-H-10 Temporary Overvoltage 8.12 9/13/00EU1498-H-11 Pressure Relief 8.13 9/13/00EU1498-H-12 Maximum Design Cantilever Load-Static 8.19 9/13/00

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TYPE TEST REPORT No. EU1498-H-01

Insulation Withstand Tests on PVIA Arrester Housing

CERTIFICATION

This is to certify that insulation withstand design tests have been successfully performedon Ohio Brass Type PVIA Intermediate Class surge arresters.

Michael G. Comber Dennis W. Lenk P.E.Manager – Engineering Principal EngineerOhio Brass & Chardon Products

Sept.13, 2000Attachments

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DESIGN TEST REPORT

Type PVIA Intermediate Class Surge Arrester

TITLE: Arrester Insulation Withstand Tests:

OBJECTIVE: To demonstrate that the voltage withstand capability of the arresterhousing external insulation meets the requirements as specified in Table 4 of IEEEC62.11-1999 Standard.

CONCLUSION: Table 1 lists PVIA arrester minimum strike distance and leakagedistance as well as required 1.2/50 impulse withstand, 60 Hz wet, and 60 Hz drywithstand capabilities. All PVIA arrester ratings meet or exceed these required levels ofwithstand voltage.

Table 1Summary Data - Insulation Withstand Test

Required Required RequiredArrester Arrester 1.2/50 60 HZ 60 HZ

Rated Strike Leakage Impulse 1 Minute 10 secondCatalog MCOV Voltage Distance Distance Withstand Dry W/S Wet W/S

No. (kVrms) (kVrms) (in) (in) (kVc) (kVrms) (kVrms)

300703 2.55 3 3.7 8 60 21 20300705 5.1 6 5.8 15.4 75 27 24

300708 7.65 9 5.8 15.4 95 35 30

300709 8.4 10 5.8 15.4 110 50 45

300710 10.2 12 5.8 15.4 110 50 45300713 12.7 15 9.5 26 110 50 45

300715 15.3 18 9.5 26 150 70 60

300717 17 21 9.5 26 150 70 60300720 19.5 24 11 30.8 150 70 60

300722 22 27 18 52 200 95 80

300724 24.4 30 18 52 200 95 80

300729 29 36 18 52 200 95 80300731 31.5 39 18 52 250 120 100

300736 36.5 45 26.5 78 250 120 100

300739 39 48 26.5 78 212 77300742 42 54 26.5 78 240 88

300748 48 60 26.5 78 261 95

300757 57 72 35 104 320 117

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Discharge Voltage Characteristic

CERTIFICATION

This is to certify that the discharge voltage characteristic design tests have beensuccessfully performed on Ohio Brass Type PVIA Intermediate Class surge arresters.


Sept. 13, 2000Attachments

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DESIGN TEST REPORTType PVIA Intermediate Class Surge Arrester

TITLE: Discharge-voltage characteristic

TEST OBJECTIVE: These measurements are used to obtain the maximum dischargevoltages at various current magnitudes and waveshapes.

TEST PROCEDURE: Discharge voltage tests were performed on three prorated testsamples consisting of two MOV disks, an aluminum end terminal, solid steel spacer, andcontact spring plate. The material selection and configuration facilitated an accurateproratio of inductive and resistive effects of all components in the impulse path of a fullarrester.

Tests were conducted in accordance with clause 8.3 of ANSI/IEEE Standard C62.11-1999“ IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits (>1kV)”.Prorated test sections were subjected to 8/20 current waves with magnitudes ranging from1.5 kA through 20 kA. In addition, Front-of-wave and switching surge discharge voltagetests were performed.

TEST SAMPLES: Arresters are assembled from discs accumulated within 10 kA IRranges as specified for each arrester rating. To verify catalog maximum IR levels werenot exceeded, a discharge voltage ratio was established at each current level based on thetest sections 10 kA IR (Table 2). That ratio was multiplied by the maximum 10 kA IRaccumulation specified for each rating. As summarized on Table 3, the IR calculatedbased on the prorated test sections were under the maximum declared catalog levels.

TEST RESULTS: Figures 1-11 contain oscillograms for test section 1 at each currentand wave shape. Figure 12 contains a graph of the 10 kA voltage vs. time to crestfunction. Figure 13 contains a graph of discharge voltage vs. current magnitude.

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figure 12 - Discharge voltage verses rate of rise

y = -0.0331Ln(x) + 1.069R2 = 0.9994

0.95

1.05

1.15

0.100 1.000 10.000

Time to Crest Voltage (ms)

Vo

ltag

e p

er u

nit

8/2

0 V

10kA

11

figure 13 - Discharge Voltage Curve

0.6000

0.7000

0.8000

0.9000

1.0000

1.1000

1.2000

100 1000 10000 100000

Current (A)

IR p

er u

nit

V10

kA (

kV)

PVIA I pu V10kA

Table 2Sample Discharge Voltage Data Summary

Discharge Voltage (kV) Discharge Voltage RatioImpulse

Current (A)Wave Shape Sample 1 Sample 2 Sample 3 Sample 1 Sample 2 Sample 3

125 60/100 16.289 16.225 16.144 0.674 0.671 0.670500 60/100 17.532 17.468 17.371 0.725 0.722 0.721

1,500 8/20 19.244 19.260 19.163 0.796 0.796 0.7962,500 8/20 20.244 20.244 20.132 0.837 0.837 0.8363,000 8/20 20.729 20.664 20.567 0.857 0.854 0.8545,000 8/20 21.859 21.875 21.778 0.904 0.905 0.904

10,000 8/20 24.184 24.184 24.087 1.000 1.000 1.00020,000 8/20 27.735 27.655 27.622 1.147 1.144 1.14740,000 8/20 32.724 32.740 32.611 1.353 1.354 1.35410,000 _ 25.789 25.986 25.592 1.066 1.075 1.06210,000 2/4 25.445 25.506 25.297 1.052 1.055 1.050

Time to Crest Voltage (µs)10,000 8/20 7.800 8.200 8.20010,000 _ 0.850 0.865 0.85010,000 2/4 1.500 1.500 1.500

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Table 3PVIA Arrester Discharge Voltage Summary

IR Multipliers 0.674 0.725 0.796 0.837 0.857 0.905 1.000 1.147 1.354 1.092

Impulse Wave 60/100 60/100 8/20 8/20 8/20 8/20 8/20 8/20 8/20 0.5µsecV

MCOV

Rating I Magnitude (A) 125 500 1500 2500 3000 5000 10000 20000 40000 10000

2.55 3 Prorated Sect Max IR 6.10 6.56 7.20 7.57 7.76 8.19 9.05 10.38 12.25 9.88

Catalog Maximum IR 6.1 6.6 7.2 7.6 7.8 8.2 9.1 10.4 12.3 9.9













17 21 Prorated Sect Max IR 37.3 40.1 44.0 46.3 47.4 50.0 55.3 63.4 74.9 60.4










31.5 39 Prorated Sect Max IR 70.1 75.4 82.8 87.0 89.1 94.1 104 119.3 140.8 113.6












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Disc Accelerated Aging

CERTIFICATION

This is to certify that the disc accelerated aging design tests have been successfullyperformed on Ohio Brass Type PVIA Intermediate Class Surge arresters.



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DESIGN TEST REPORTPVIA Intermediate Class Surge Arrester

TITLE: Accelerated aging procedure

TEST OBJECTIVE: Tests were performed to measure MOV disc aging characteristics.Measured watts values are used to develop elevated voltage ratios kc and kr for use indetermination of proratio factor of duty cycle and discharge current withstand testsamples.

TEST SAMPLES: Six arrester modules were prepared. The first (3) modules consistedof the shortest 40 mm diameter MOV disc , spring, end terminals, barrier film andfiberglass/epoxy wrap using standard module construction. The second (3) modules wereconstructed similarly with the longest 40mm diameter discs.

TEST PROCEDURE: Tests were performed per Section 8.5 of ANSI/IEEE C62.11-1999 Standard. Samples were placed inside a 115 °C ±2 °C. oven and energized atMCOV for 1,000 hours. As with the durability tests, MCOV and rated test voltages wereprorated to design limits based on 5 ma Vref.

TEST RESULTS: Watts loss for each sample was recorded at MCOV and duty cyclerated voltage two hours after energization and at the completion of the 1000 hour testduration. The following table summarizes test data.

Accelerated aging test data

Sample

Watts Lossat 2 Hr

@MCOV

Watts Lossat 1000 Hr@MCOV

Watts Lossat 2 Hr

@Rating

Watts Lossat 1000 Hr@Rating Elevation Factors

Number P1c (w) P2c (w) P1r (w) P2r (w) Kc Kr

1 .928 .608 3.97 3.43 1.0 1.02 .997 .594 4.06 3.32 1.0 1.03 1.129 .713 4.64 3.80 1.0 1.04 1.481 .973 5.48 4.02 1.0 1.05 1.397 .995 5.34 4.08 1.0 1.06 1.286 1.271 5.75 5.27 1.0 1.0

CONCLUSION: Each test sample demonstrated decreasing watts loss at MCOV. Thewatts loss at rating also declined. Therefore, Kc and Kr factors equal 1.0.

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Polymer Accelerated Aging

CERTIFICATION

This is to certify that the polymer accelerated aging design tests have been successfullyperformed on Ohio Brass Type PVIA Intermediate Class surge arresters.



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TITLE: Accelerated aging tests of external polymeric insulating systems :

TEST OBJECTIVE: These tests were performed per clause 8.6 of IEEE StandardC62.11-1999. While this test was written for polymer-housed Distribution Class arresters,the polymer-housing portion of the design test was performed on the PVIA arresterhousing.

TEST SAMPLES: Three PVIA 10.2 kV MCOV and three PVIA 17 kV MCOV arresterswere tested. These represent the highest MCOV stress based on leakage distance andarcing distance.

TEST PROCEDURE: Accelerated aging tests by exposure to electrical stress wereperformed per clause 8.6.2. Tests were performed by attaching arresters to a verticalFerris wheel. As the wheel rotates, each arrester is sequentially dipped into a 400 ohm-centimeter water bath. Each arrester is allowed to drip off excessive contaminant and isthen energized at MCOV to force the arrester housing into a dry band corona condition.The arrester test is performed until each arrester has reached 1000 hours of energized testtime. Prior to and after the 1000 hour test, each arrester is subjected to a 10 kA 8/20discharge to confirm its electrical integrity.

CONCLUSION: Both polymer housing sizes passed the test requirements of clause8.6.1.3, as there were no cracks greater than the allowed depth of .1 mm. The arrestersalso passed the requirements of clause 8.6.2.4, as the arrester discharge voltage changedby less than 1 % as a result of the 1000 hour Ferris wheel test. There was no evidence ofexternal flashovers, punctures, or internal breakdowns during the described tests. Therewas no evidence of surface tracking on the PVIA arrester housings after the 1000 houron-voltage test.

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Contamination Test

CERTIFICATION

This is to certify that the contamination design test has been successfully performed onOhio Brass Type PVIA Intermediate Class surge arresters.



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TITLE: Contamination tests:

TEST SAMPLE: Tests were performed in accordance with clause 8.7 of IEEE StandardC62.11-1999 on the highest rated arrester (72 kV).

TEST PROCEDURE: Contaminant was prepared per clause 8.7.2.2 and the testprocedure run per clause 8.7.2.3. The arrester was energized at MCOV for 1 hour priorto application of the slurry mixture. The arrester watts loss was measured throughout thetest to monitor thermal stability.

Immediately following the 1 hour preheat, slurry was applied to the bottom half of thearrester. Within 3 minutes, MCOV was applied and watts loss measured for 15 minutes.At the end of this 15 minute test, the arrester was de-energized and the second slurrycoating was applied. The arrester was then energized for an additional 15 minutes. Atthe end of this second 15 minute test, the arrester was maintained at MCOV until thermalstability was demonstrated.

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TEST RESULTS: The following table summarizes the results of this test.Time (min) Applied Voltage

(kV rms)Arrester Watts Loss (w) Arrester Total Current

mapeak

0 57 1.1 .4415 57 1.1 .4445 57 1.1 .4460 57 1.1 .44

Partial Wetting Slurry Application

0 57 8.7 .781 57 8.5 .735 57 7.0 .6810 57 6.0 .6215 57 3.0 .54

Partial Wetting Slurry Application

0 57 10.0 .981 57 9.5 1.05 57 9.8 1.010 57 9.2 .8815 57 6.2 .58

Thermal Recovery

0 57 6.2 .5810 57 1.7 .4820 57 1.4 .4530 57 1.2 .45

CONCLUSION: The PVIA 72 kV rated arrester successfully passed the contaminationtest as specified in Section 8.7 of IEEE C62.11-1999 Standard.

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INTERNAL IONIZATION and RIV

CERTIFICATION

This is to certify that the internal ionization and RIV design tests have been successfullyperformed on Ohio Brass Type PVIA Intermediate Class surge arrester.



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TITLE: Internal-ionization voltage (IIV) and RIV tests:

TEST PROCEDURE AND SAMPLE: Internal ionization and RIV testing wasperformed per clause 8.9 of IEEE Standard C62.11-1999. The test was performed on a72 kV rated, 57 kV MCOV PVIA arrester.

TEST EQUIPMENT: Equipment and test methods conformed to NEMA LA 1-1992requirements. Prior to the test, the Stoddart Noise Meter NM-25T was calibrated using aGeneral Radio Signal Generator Type 1001-A.

TEST RESULTS: A background noise level of 0.5 µV was measured at an open circuitvoltage of 30.5 kV (105%MCOV). With the unshielded 72 kV rated arrester placed inthe circuit, a noise level of 0.6 µV was measured at the kV test voltage.

CONCLUSION: The 72 kV rated PVIA arrester passed test requirements per Section8.9 of IEEE C62.11-1999 Standard, as measured noise levels were well within the 10 µVtest limit.

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HIGH CURRENT, SHORT DURATION TEST

CERTIFICATION

This is to certify that the high current, short duration design test has been successfullyperformed on Ohio Brass Type PVIA Intermediate Class surge arrester.

Michael G. Comber Dennis W.Lenk P.E.Manager – Engineering Principal EngineerOhio Brass & Chardon Products


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TITLE: High Current, Short Duration Discharge Withstand Test

TEST PROCEDURE: High current, short duration discharge withstand tests wereperformed per clause 8.10.1 of IEEE Standard C62.11-1999. Instead of subjecting thetest samples to the 65 kA high current required for Intermediate Class arresters, testswere actually performed at a more severe 100 kA per Heavy Duty Distribution arresterrequirements using a prorated test section.

TEST SAMPLE: As required by clause 7.2.2, the prorated sample contains theminimum MOV mass allowed for the design. MCOV voltage was also prorated per unitVref to reflect the lowest margin case of the standard voltage ratings offered in thisdesign. Assigned MCOV of the prorated section was 9.65 kVrms.

TEST RESULTS: The test sample was subjected to two 100 kA, 4/10 discharges.Sufficient time was allowed between discharges for the sample to cool to ambienttemperature 23 °C. Within 5 minutes after the second high current discharge, the samplewas energized at the prorated recovery voltage. Watts loss was monitored over a 30minute period demonstrating thermal stability.

First Shot100.9 kA Magnitude5.1/12.6 Waveshape

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Second Shot101.9 kA Magnitude5.1/12.6 Waveshape

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The following oscillograms monitor the arrester voltage and grading current during the30 minute recovery test.

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The following table summarizes the thermal recovery portion of the HCSD test.Time (minutes) Recovery Volts (kVrms) Section Watts Section Current (mac)

0 10.10 7.02 2.511 10.09 4.67 1.562 10.09 4.01 1.325 10.06 2.78 0.9010 10.09 2.18 0.7420 10.10 1.56 0.6430 10.13 1.30 0.62

Residual voltage at 10 kA was measured prior to and after the 100 kA discharge andthermal recovery tests. The following oscillograms verified the 10 kA discharge voltageremained unchanged within acceptable limits.

10 kA IR Before HCSD Test = 29.9 kV

10 kA IR After HCSD Test = 30.3 kV

CONCLUSION: The prorated test sample successfully completed the high current testand demonstrated thermal stability during the recovery test. The 10 kA residual voltageincreased 1.3%, less than the allowed 10%. Disassembly revealed no evidence ofphysical damage to the test sample. The PVIA design successfully met the severe HighCurrent, Short Duration requirements of a Heavy Duty Distribution Class Arrester.

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TRANSMISSION LINE DISCHARGE TEST

CERTIFICATION

This is to certify that the transmission line discharge design test has been successfullyperformed on Ohio Brass Type PVIA Intermediate Class surge arrester.



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TITLE: Transmission Line Discharge Test:

OBJECTIVE: Section 8.10.2.1 specifies circuit test parameters for validating thetransmission line discharge capability of the PVIA Intermediate Class arrester. For thisdesign, the low current, long duration discharge withstand test was actually performedper clause 8.10.2.2 of IEEE Standard C62.11-1999, as the LCLD test requires a 250amp, 2millisecond wave, which is more severe than the resultant current from Section8.10.2.1.

TEST SAMPLE: As required by clause 7.2.2, the prorated test sample contained theminimum MOV mass per specified for the design. MCOV voltage was also prorated perunit Vref to reflect the lowest margin case of the standard voltage ratings offered in thisdesign

TEST PROCEDURE: The test sample was subjected to three sets of six 250 A, 2000 µsdischarges. Sufficient time was allowed between discharges for the sample to cool to anambient temperature of 23 °C. Following the eighteenth impulse, the test section wasplaced in an oven at 60 °C. After reaching 60 °C, the sample was subjected to twoadditional 250 A discharges. Within 5 minutes after the twentieth low current, longduration discharge, the sample was energized at the prorated recovery voltage. Watts losswas monitored over a 30 minute period demonstrating thermal stability.

TEST RESULTS: The following summarizes the results of the transmission linedischarge test.

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Short Circuit Waveform Validating 2.14 Millisecond Duration

First LCLD Shot @ 367 Amps

Second LCLD Shot @ 297 Amps

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Nineteenth LCLD Shot @ 266 Amps

Twentieth LCLD Shot @ 258 Amps

Immediately after the 20th LCLD shot, the test section was energized at 10.35 kVrmsrecovery voltage and watts and grading current monitored for 30 minutes. The followingtwo oscillograms show the section voltage and grading current at the start of the recoverytest and after 30 minutes.

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Grading Current/Voltage @ time = 0 Minutes During Recovery

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Grading Current/Voltage @ time = 30 Minutes During Recovery

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The following table summarizes the 20 shot LCLD test, including the 2 shots prior tothermal recovery.

Shot # Discharge Voltage -kVc

Discharge Current-kAc

Discharge Energy-KJ

1 22.5 367 20.02 22.5 298 16.33 22.5 261 14.44 22.7 259 14.35 22.8 254 14.16 23.0 260 14.6

Cool to ambient7 22.1 276 14.98 22.4 268 14.69 22.5 262 14.410 22.7 259 14.311 22.8 255 14.212 22.9 260 14.6

Cool to ambient13 22.2 284 15.314 22.4 276 15.115 22.6 271 14.916 22.7 268 14.817 22.8 263 14.618 22.9 258 14.4

Pre-heat to 62oC19 22.4 266 14.720 22.7 259 14.3

Immediately after the 20th shot, the arrester section was energized at its 10.35 kVrms

recovery voltage and watts and grading current monitored for 30 minutes to demonstratethermal stability.

Time-minutes Applied Volts-kVrms Watts Grading current-mac

0 10.41 5.14 1.631 10.39 4.11 1.282 10.39 3.79 1.185 10.43 3.26 1.0610 10.36 2.61 .8420 10.36 2.03 .7630 10.37 1.76 .70

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Residual voltage at 10 kA was measured prior to and following the 250 A discharge andthermal recovery tests.

10 kA IR Before LCLD Test = 30.15 kV

10 kA IR After LCLD Test = 30.53 kV

CONCLUSION: The prorated test sample successfully completed the low current, longduration test and demonstrated thermal stability during the recovery test. The sectiondischarge voltage increased 1.2%, below the 10% change allowed in Section 8.10.2.2.3 ofIEEE C62.11-1999 Standard. Disassembly revealed no evidence of physical damage tothe test samples. The PVIA arrester successfully met the Transmission Line Dischargerequirements of an Intermediate Class arrester.

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DUTY CYCLE TEST

CERTIFICATION

This is to certify that the duty cycle design test has been successfully performed on OhioBrass Type PVIA Intermediate Class surge arrester.

Michael G. Comber Dennis Lenk P.E.Manager – Engineering Principal EngineerOhio Brass & Chardon Products


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TITLE: Duty Cycle Test:

TEST OBJECTIVE: Section 8.11.1.3 specifies that the 20-shot rated voltage and 2-shotrecovery portion of the Duty Cycle test on Intermediate Class arresters be performed with5 kA 8/20 lightning impulses. The actual Duty Cycle tests were performed per the moresevere Heavy Duty Distribution arrester requirements, which subjects the test sample to20-10kA impulses and then 2-40 kA impulses during the recovery portion of the DutyCycle test.

TEST SAMPLE: As required by clause 7.2.2, prorated samples contained the minimumMOV mass per specified for the design. MCOV and rated voltages were also proratedper unit Vref to reflect the lowest margin case of the standard voltage ratings offered inthis design.

TEST PROCEDURE: The 9.75 kVrms MCOV test sample was energized at its 11.82kVrms rated voltage and subjected to twenty 10 kA, 8/20 discharges spaced at 1 minuteincrements. Following the twentieth impulse, the test section was placed in an oven at60 °C. After reaching 60 °C, the sample was subjected to two 40 kA, 8/20 discharges.Within 5 minutes after the second high current discharge, the sample was energized at theprorated recovery voltage of 10.19 kVrms. Watts loss was monitored over a 30 minuteperiod demonstrating thermal stability.

TEST RESULTS: The following data summarizes the results of the duty cycle test.

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First Shot of 20 Shot Rated Voltage Duty Cycle Test

10 kA 8.1/18.8 Waveshape for 20 Shot Test

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20th Shot of 20 Shot Rated Voltage Duty Cycle Test

41.2 kA 8.1/20.8 Waveshape for 2-Shot Test

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Oscillogram of 22nd Shot

Immediately after the 22nd shot, the arrester section was energized at recovery voltage.The following oscillograms show section grading current measured at time 0, 1 minute,and 30 minutes.

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The following table summarizes the results of the 20 shot rated duty cycle voltage test.

Shot No. Applied Voltage(kVrms)

Watts Grading Current(mac)

8/20 Impulse(kA)

1 11.85 8.5 3.9 10.22 11.85 9.5 4.1 10.53 11.85 10.1 4.5 10.64 11.86 10.7 5.2 10.05 11.87 12.0 5.7 10.26 11.87 12.8 5.8 10.57 11.87 14.0 6.3 10.58 11.86 15.0 7.1 10.19 11.86 17.0 8.1 10.0

10 11.86 18.8 8.8 10.411 11.86 21.1 9.4 10.412 11.86 24.3 10.7 10.413 11.86 27.2 11.7 10.314 11.85 31.7 13.6 10.315 11.85 34.5 14.3 10.416 11.84 40.6 17.0 10.317 11.85 48.7 20.3 10.218 11.84 58.4 22.7 10.219 11.84 76.3 29.2 10.220 11.84 109.2 41.4 10.2

The following table summarizes the 21st and 22nd shots after sample preheating to 60oC.

Shot No. AppliedVoltage (kVrms)

Watts GradingCurrent (mac)

8/20 Impulse(kA)

21 10.19 6.1 1.81 40.622 10.22 40.6 12.24 51.2

The following table summarizes the recovery voltage portion of the duty cycle test.

Time(minutes)

Applied Voltage(kVrms)

Watts Grading Current (mac)

0 10.22 40.6 12.21 10.26 10.7 3.62 10.25 8.9 2.45 10.24 5.9 1.610 10.20 4.4 1.420 10.17 3.5 1.330 10.24 3.0 1.2

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Residual voltage at 10 kA was measured prior to and following the Duty Cycle testseries.

10 kA IR Before Duty Cycle Tests = 30.01 kV

10 kA IR After Duty Cycle Tests = 30.79 kV

Conclusion: The prorated test sample successfully completed Duty Cycle testing anddemonstrated thermal stability during the recovery test. The 10 kA discharge voltageincreased 2.6%, less than the acceptable 10% limit specified in Section 8.11.1.4 ofC62.11-1999 Standard. Disassembly revealed no evidence of physical damage to the testsample. The PVIA arrester successfully met the Duty Cycle requirements of theIntermediate Class arrester.

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TEMPORARY OVERVOLTAGE TEST

CERTIFICATION

This is to certify that the temporary overvoltage design test has been successfullyperformed on Ohio Brass Type PVIA Intermediate Class surge arrester.



44


TITLE: Temporary over-voltage tests (TOV):

TEST SAMPLES: Temporary over-voltage tests were performed per clause 8.12 ofIEEE Standard C62.11-1999. Tests were performed per Intermediate Class arresterrequirements using five prorated test sections. Prorated sections were used to facilitatetesting of the lowest MOV mass, highest stressed arrester rating at voltages withinavailable laboratory facility capabilities.

TEST PROCEDURE: Per clause 8.12.1, each prorated sample was tested within five ofthe six designated time ranges a - f, spanning over-voltage durations of .01 - 10,000seconds. Per clause 8.12.2, the tests were performed demonstrating TOV capability of thedesign under "no prior duty" conditions. For each TOV voltage setting, the test circuitapplied voltage to the sample (preheated to 60oC) for a time duration sufficient to exceedthat claimed on the "no prior duty" curve. TOV voltage was superimposed over recoveryvoltage such that when TOV was removed, there was no delay prior to application ofrecovery voltage. Recovery voltage was applied for 30 minutes to demonstrate thermalstability.

TEST RESULTS: The following curve summarizes the results of the TOV test program.

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PVIA NO PRIOR DUTY TOV CURVE PER SECTION 8.12 of IEEE C62.11-1999 STD

1.2

1.25

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

1.7

0.01 0.1 1 10 100 1000 10000

Time-Seconds

PE

R U

NIT

TIM

ES

MC

OV

Data Points Capability Curve

The following table summarizes the TOV capability curve as a function of time, asrequired by Section 8.12.3.

Time-Seconds TOV Per Unit Times MCOV.02 1.630.10 1.5501.0 1.45010 1.372

100 1.3131000 1.262

CONCLUSION: Tests were successfully completed on five PVIA prorated samples infive specified time ranges. Each sample demonstrated thermal stability after TOVexposure having no signs of physical damage during inspection. Residual voltage at 10kA measured prior to and following the complete TOV test series verified characteristicsremained unchanged within acceptable limits.

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TYPE TEST REPORT No. EU 1498-H-11

PRESSURE RELIEF TEST

CERTIFICATION

This is to certify that the pressure relief design test has been successfully performed onOhio Brass Type PVIA Intermediate Class surge arrester.



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TITLE: Pressure Relief Test For Polymer Housed Intermediate Class Arrester:

TEST OBJECTIVE: Pressure relief tests were performed on the Type PVIA polymer-housed Intermediate Distribution Class arrester per Section 8.13 of IEEE C62.11-1999Standard.

TEST SAMPLES: Tests were performed on fusewire shorted and overvoltage failedarresters as defined in Table 14 of the referenced standard. Pressure relief tests wereperformed on the longest mechanical section, as required in Section 8.15.1 of thestandard.

TEST PROCEDURE: As required in Section 8.15.1.1, two test samples for the highcurrent test were assembled with a fuse wire oriented axially between the mov disc stackand the fiberglass-epoxy wrap. These samples were subjected to the full offset currenttest. In addition, six samples represented standard production arresters. These sampleswere failed using the specified 2-source failure mode procedure. All tests were performedat full voltage. Therefore, the prospective fault current, as measured during the boltedfault test on the generator, is the claimable pressure relief current capability of the design.

TEST RESULTS: The following table summarizes the results these tests whichvalidated the claimed maximum 20 kArms symmetrical, 12 cycle fault current withstandcapability of this design, with an applied ratio of 1.55 between total asymmetrical tosymmetrical rms currents. This corresponds to a 2.6 ratio, in the first half loop of faultcurrent, between the crest asymmetrical to rms symmetrical current, i.e., full offset. Inaddition to testing at the claimed maximum capability, tests were also performed, usingthe 2-source procedure, at half the claimed capability and at 600 amps as specified inTable 14 of the standard.

Calibration Test 21.85 kA Symmetrical RMS 34.74 kA Asymmetrical RMS

Sample#

FailureMode

Minimum TestDuration-seconds

Condition of Module/PolymerHousing After Test

1 Fuse Wire .2 Module Intact/Housing Separated2 Fuse Wire .2 Module Intact/Hsg Torn but in Place3 2-Source .2 Module Intact/Hsg Torn but in Place4 2-Source .2 Module Intact/Hsg Torn but in Place

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Calibration Test 10.1 kA Symmetrical RMS No Asymmetrical Requirement

Sample#

FailureMode



5 2-Source .2 Module Intact/Hsg Torn but in Place6 2-Source .2 Module Intact/Hsg Separated

Calibration Test 600 Amp Symmetrical RMS No Asymmetrical Requirement

Sample#

FailureMode



7 2-Source 1.0 Module Intact/Hsg Torn but in Place8 2-Source 1.0 Module Intact/Hsg Torn but in Place

CONCLUSION: The eight test arresters assembled with the longest mechanical unit metthe test evaluation criteria as specified in Section 8.15.3 of IEEE C62.11-1999 Standard.In all tests, the arrester module remained intact after the completion of each test. Theflexible polymer housing wall section split, as intended, on all samples to allow ventingof internal arcing gases to the outside of the arrester. In all cases, flames associated withthe fault current test extinguished immediately after completion of the test, well withinthe allowed 2 minute duration. These tests have demonstrated the capability of the PVIAarrester design to discharge a maximum claimable 20 kArms symmetrical fault currentusing the test procedure defined in Section 8.15 of IEEE C62.11-1999 Standard.

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MAXIMUM DESIGN CANTILEVER LOAD-STATIC TEST

CERTIFICATION

This is to certify that the maximum design cantilever load-static design test has beensuccessfully performed on Ohio Brass Type PVIA Intermediate Class surge arrester.



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TITLE: Maximum Design Cantilever Load-Static Test

TEST SAMPLES: The maximum design cantilever load (static) test was performed onthree PVIA 15.3 kV MCOV arresters, representing the longest PVIA mechanical unit.Tests were performed on this 8.5” long arrester to validate the claimed 1200 inch-poundcontinuous cantilever rating.

TEST PROCEDURE: Testing was performed per the procedures specified in Section8.19.2 of IEEE Std C62.11-1999. Per paragraphs a) and b), each test arrester was rigidlymounted at its base and top end loading applied to develop 1200 inch-pound cantileverload. With the arrester under load, the arrester was energized at 1,05 times MCOV andinternal ionization was measured. Also, top end deflection measured at this load. . Perparagraph c), successive testing was performed at 0o, 90o, 180o, and 270o. The results ofthis initial testing before temperature thermal cycling is summarized below. Backgroundnoise level was .7 microvolts for arrester #1 and .4 microvolts for arresters #2 and 3.

TEST RESULTS: The following summarizes the results of these tests.

Mechanical Loading Tests Prior to Thermal CyclingArrester

#Direction of Applied

1200 in-lb Load(Degrees)

IIV @ 1.05 TimesMCOV

(Microvolts)

Top EndDeflection(inches)

1 0 .8 .441 90 .8 .441 180 .8 .441 270 .8 .442 0 .5 .442 90 .4 .442 180 .6 .442 270 .6 .443 0 .5 .443 90 .7 .443 180 .7 .443 270 .7 .44

Per paragraph d), each arrester was placed inside a thermal cycling oven for 96 hours andsubjected to a combination of 1200 inch-pound load rotations and temperature excursionsas specified in Figure 3 of C62.11-1999 Standard.

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After completion of the thermocycling testing, the testing per paragraphs b) and c) wasrepeated. The results of this testing is summarized below with .7 microvolts ofbackground noise.

Mechanical Loading Tests After Thermal CyclingArrester

#Direction of Applied

1200 in-lb Load(Degrees)

IIV @ 1.05 TimesMCOV

(Microvolts)

Top EndDeflection(inches)

1 0 .8 .441 90 .8 .441 180 .8 .441 270 .8 .442 0 .7 .442 90 .7 .442 180 .7 .442 270 .8 .443 0 .7 .443 90 .7 .443 180 .7 .443 270 .7 .44

CONCLUSION: Per Section 8.19.3, the internal ionization levels and top end deflectionmeasurements were unchanged as a result of the thermal cycling test. Visual examinationrevealed no evidence of mechanical damage. The above tests have validated the 1200inch-pound continuous cantilever rating of the base mounted PVIA arrester.

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