IEC Type Test Report Report No. EU1515-H-00.3 Type PVI-LP Polymer Arrester 10,000 A Line Discharge Class 2

Transcription

1 IEC Type Test Report Report No. EU1515-H-00.3 Type PVI-LP Polymer Arrester 10,000 A Line Discharge Class 2 This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005, Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Type tests performed on 10 ka Class 2 arresters demonstrate full compliance with the relevant clauses of the referenced standard and apply to all Hubbell 10 ka Class 2 arresters of this design manufactured and assembled at the following ISO 9001:2008 certified Hubbell locations: Hubbell Power Systems Hubbell Electric (Wuhu) Company, Ltd Richland Avenue, East Exports Processing Zone, No 68 Aiken, South Carolina North Jiuhua Road, Wuhu City Anhui Province, PR China The above locations manufacture, assemble, and test utilizing manufacturing, quality, and calibration procedures developed from Hubbell Engineering Department Specifications. Engineering Department Specifications are controlled by Arrester Business Unit design engineering in the USA. D. W. Lenk Principal Engineer Date 8/27/2012 Separate reports provide details of each test, according to the following table: Report No. Description Clause Issue date EU1515-H-01.1 Insulation Withstand Test on Arrester Housing 8.2 8/27/2012 EU1515-H-02.1 Residual Voltage 8.3 8/27/2012 EU1515-H-03.1 Long Duration Current Withstand 8.4 8/27/2012 EU1515-H-04.1 Accelerated Aging Procedure /27/2012 EU1515-H-05.1 Heat Dissipation Behavior of Test Section /27/2012 EU1515-H-06.1 Switching Surge Operating Duty /27/2012 EU1515-H-07.1 Partial Discharge 8.8 8/27/2012 EU1515-H-08.1 Power Frequency Voltage Versus Time Annex D 8/27/2012 EU1515-H-09.1 Short Circuit Annex N 8/27/2012 EU1515-H-10.2 Bending Moment /30/2012 EU1515-H-11.1 Moisture Ingress /27/2012 EU1515-H Hour Weather Aging Test /27/2012 EU1515-H Hour Salt Fog /27/2012

2 IEC Type Test Report Report No. EU1515-H-01.1 Polymer Arrester 10,000 A Line Discharge Class 2 INSULATION WITHSTAND TESTS ON THE ARRESTER HOUSING IEC CLAUSE 8.2 This report records the results of this type test made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005, and Amendment 2 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Dennis W. Lenk Principal Engineer Date: 8/27/2012

3 IEC Type Test Report INSULATION WITHSTAND TESTS ON THE ARRESTER HOUSING IEC CLAUSE 8.2 Table 1 summarizes polymer housing minimum leakage and strike distances for each arrester rating, and 60 Hz and impulse withstand requirements for each housing size. In all cases, the actual withstand values of each arrester housing exceed the minimum values specified in the Standard. Table 1. Insulation Withstand Voltage Requirements of IEC 10 ka Class 2 Arresters. Rating (kv rms) COV (kv rms) Minimum Leakage Distance (mm) Minimum Strike Distance (mm) BIL Withstand Required (kvc) Power Frequency 1 Minute Wet Withstand Required (kvc, peak) EU1515-H

4 IEC Type Test Report Report No. EU1515-H-02.1 Polymer Arrester 10,000 A Line Discharge Class 2 Residual Voltage IEC Clause 8.3 This report records the results of type tests made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

5 TITLE: Residual-voltage characteristic IEC TYPE TEST REPORT Residual Voltage IEC Clause ka Class 2 Surge Arrester TEST OBJECTIVE: These measurements are used to obtain the maximum discharge voltages at various current magnitudes and waveshapes. TEST PROCEDURE: Discharge voltage tests were performed on three single disc test samples. Tests were conducted in accordance with clause 8.3 of IEC Standard. Test samples were subjected to 8/20 current waves with magnitudes ranging from 1.5 ka through 20 ka. In addition, Front-of-wave and switching surge discharge voltage tests were performed. TEST SAMPLES: Arresters are assembled from discs accumulated within 10 ka IR ranges as specified for each arrester rating. To verify catalog maximum IR levels were not exceeded, a discharge voltage ratio was established at each current level based on the test sections 10 ka IR (Table 1). That ratio was multiplied by the maximum allowed 10 ka IR accumulation specified for each rating. As summarized on Table 2, the IR calculated based on the prorated test sections do not exceed the maximum declared catalog levels for the current levels specified in clause 7.3. TEST RESULTS: Figures 1-12 contain oscillograms for test section 1 at each current and wave shape. Figure 1 125A, 9.950, 56/99 Waveshape Oscillogram not available Figure 2 500A, , 56/99 Waveshape EU1515-H

6 Figure 3 1 ka, kV, 56/99 Waveshape Figure ka, kv, 8.4/18.4 Waveshape Figure 5 3 ka, kv, 8.4/18.4 Waveshape EU1515-H

7 Figure 6 5 ka, kv, 8.4/18.4 Waveshape Figure 7 10 ka, kv, 8.7/19.0 Waveshape Figure 8 20 ka, kv, 8.2/18.7 Waveshape EU1515-H

8 Figure 9 40 ka, kv, 8.5/19.4 Waveshape Figure ka FOW, to voltage crest Figure ka FOW, microseconds to voltage crest EU1515-H

9 Figure ka FOW, microseconds to voltage crest Impulse Current (A) Wave Shape Table 1 Sample Discharge Voltage Data Summary Discharge Voltage (kv) Discharge Voltage Ratio Sample 1 Sample 2 Sample 3 Sample 1 Sample 2 Sample / / / ,500 8/ ,000 8/ ,000 8/ ,000 8/ ,000 8/ ,000 8/ ,000 ½ ,000 2/ Time to Crest Voltage (µs) 10,000 8/ ,000 ½ ,000 2/ EU1515-H

10 Table 2 IEC 10 ka Class 2 Arrester Discharge Voltage Summary IR Multipliers Impulse Wave 60/100 60/100 8/20 8/20 8/20 0.5usec MCOV Rating I Magnitude (A) Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR Specimen Measured IR Catalog Maximum IR EU1515-H

11 IEC Type Test Report Report No. EU1515-H-03.1 Polymer Arrester 10,000 A Line Discharge Class 2 LONG DURATION CURRENT IMPULSE WITHSTAND TESTS IEC CLAUSE 8.4 This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

12 IEC Type Test Report LONG DURATION CURRENT IMPULSE WITHSTAND TESTS IEC CLAUSE 7.4 Sample Preparation Long duration current impulse withstand tests were performed on three test samples. MOV discs for each test sample were selected to represent the lowest acceptable reference voltage level. Test Parameters and Procedure Three samples were subjected to line discharge tests in accordance with line discharge Class 2 in Table 5 of Clause 8.4. All generator parameters conformed to Class 2 line discharge requirements. Prior to the transmission line discharge tests, 10 ka, 8/20 µs discharge voltage and reference voltage of the test samples were measured. Initial measurements and associated parameters for the three samples are given in Table 1. Table 1. Parameters for Line Discharge Tests on 10 ka Line Discharge Class 2 Arrester Samples. Test Parameters Sample 1 Sample 2 Sample 3 Initial Residual Voltage 10 ka, 8/20 µs Reference Current (ma) I ref Reference Voltage (kv c ) V ref COV ( kv rms) U c Rating (kv rms) U r Arrester Classification (ka) Line Discharge Class Virtual Duration of Peak (µs, 90-90%) Max. Generator Impedance (Ω) Z g Min. Generator Charging Voltage (kv) U L The transmission line discharge tests defined by IEC Standard , 1998, consisted of subjecting each test sample with eighteen rectangular waveshape discharges. The eighteen discharges were of six groups with three consecutive operations at a time interval of 50 to 60 seconds between the consecutive operations. The samples were allowed to cool to ambient temperature between groups of discharges. Test Results EU1515-H

13 Figure 1 shows the surge impedance of the transmission line generator and confirms the virtual duration of the generator. The samples were exposed to still air at ambient temperature of 21 C during the test. A summary of the test results is shown in Table 2. Figure 1. Z g = 11,090 V / A = Ω, Virtual Peak Duration = 2146 µs. Table 2. Transmission Line Discharge Tests Impulse Sample 1 Sample 2 Sample 3 I (A) V (kv) E (kj) I (A) V (kv) E (kj) I (A) V (kv) E (kj) Figure 2 shows oscillograms of the first and eighteenth transmission line discharges of sample 1. EU1515-H

14 Sample 1, Shot 1, Discharge Current = 588A Discharge Voltage = kv, Energy under V-I Curve = kj Sample 1, Shot 18, Discharge Current = 556A Discharge Voltage = kv, Energy Under V-I Curve = kj Figure 2. Transmission line discharges of sample 1. EU1515-H

15 Figure 3 shows oscillograms of the first and eighteenth transmission line discharges of sample 2. Sample 1, Shot 1, Discharge Current 588A Discharge Voltage = kv, Energy under V-I Curve = kj Sample 2, Shot 18, Discharge Current = 556A Discharge Voltage = kv, Energy Under V-I Curve = kj Figure 3. Transmission line discharges of sample 2. EU1515-H

16 Figure 4 shows oscillograms of the first and eighteenth transmission line discharges of sample 3. Sample 3, Shot 1, Discharge Current = 588A Discharge Voltage = kv, Energy under V-I Curve = kj Sample 3, Shot 18, Discharge Current = 560A Discharge Voltage = kv, Energy Under V-I Curve = kj Figure 4. Transmission line discharges of sample 3. EU1515-H

17 Subsequent to the completion of the transmission line discharges, 10 ka, 8/20 µs discharge voltage of the three test samples was measured. Results of the residual voltage measurements are summarized in Table 3. The maximum change of residual voltage of the three samples is less than the permissible change of 5 % defined by IEC Standard , Test Summary Table 3. Residual Voltage (10 ka, 8/20 µs) Measurements Before and After Long Duration Current Impulse Withstand Test. RESIDUAL VOLTAGE (kv) CHANGE SAMPLE Before After (%) The three test samples successfully passed the transmission line discharge tests per Section 8.4 of IEC Standard , For all three samples, the change of 10 ka, 8/20 µs residual voltage measured before and after the transmission line discharges is less than 1%, below the allowed 10%. Disassembly revealed no evidence of physical damage to the three test samples. Each of the three test samples has successfully fulfilled the long duration current impulse withstand requirements of IEC Class 2 arresters. EU1515-H

18 IEC Type Test Report Report No. EU1515-H-04.1 Polymer Arrester 10,000 A Line Discharge Class 2 ACCELERATED AGEING PROCEDURE IEC CLAUSE This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

19 IEC Type Test Report ACCELERATED AGEING PROCEDURE IEC CLAUSE Tests were performed to measure the MOV disc aging characteristics. Measured watts loss values are used to develop an elevated voltage ratio K ct that is used in the operating duty test to simulate the performance of an arrester with service life equivalent to 1000 hours at 115 C. Sample Preparation Three arrester modules were prepared. The (3) modules consisted of the longest 50 mm diameter MOV disc, spring, end terminals, barrier film and fiberglass/epoxy wrap using standard module construction. Test Procedure Accelerated aging tests were performed per Section of IEC Standard , Test samples were energized by a voltage equal to the corrected maximum continuous operating voltage U ct of the three test samples for 1000 hours at 115 C ± 2 C. Individual watts loss and temperature were measured at U ct at the start (2 hours) and at the end (1000 hours) of the aging tests after energization. The initial watts loss is designated as P 1ct while the final watts loss is P 2ct. Table 1 summarizes the results of the 1000 hour accelerated aging tests. The watts loss values were measured at 115 C ± 2 C. Watts Loss at 2 Table 1. Accelerated Aging Tests. Watts Loss at 1000 Watts Loss at 2 Watts Loss at 1000 Elevation Factors Sample Number P 1c (w) P 2c (w) P 1r (w) P 2r (w) K c K r Test Summary For each sample, the final watts loss value at U ct is less than the initial watts loss value measured. Therefore, no elevation factors were required to apply to COV (U c ) or Rating (U r ) during the operating duty tests. EU1515-H

20 IEC Type Test Report Report No. EU1515-H-05.1 Polymer Arrester 10,000 A Line Discharge Class 2 HEAT DISSIPATION BEHAVIOUR OF TEST SAMPLES IEC CLAUSE This report records the results of this type test made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Dennis. W. Lenk Principal Engineer Date: 8/27/2012

21 IEC Type Test Report HEAT DISSIPATION BEHAVIOUR OF IEC 10KA CLASS 2 12 KV RATED ARRESTER AND 12 KV RATED ARRESTER SECTION Introduction IEC CLAUSE Tests were performed in accordance with clause and Annex B of IEC Standard , The purpose of this test was to verify that the thermal cooling curve of the 12 kv rated arrester prorated section, when internally heated, cools slower than that of a similarly heated 72 kv rated arrester. To achieve the same cooling rate for both samples, external insulation is attached between the polymer housing sheds on the 12 kv arrester section. Sample Preparation The 72 kv rated arrester was assembled without external insulation. The 12 kv rated prorated arrester section was assembled with external insulation located between arrester housing sheds. Each sample was assembled with a thermocouple located in the middle of the arrester module, between mov discs. Test Procedure The test units were placed in still air at ambient temperature. Both arresters were heated using a 60 Hz source. The targeted final heating temperature was C with the test lab ambient temperature at 23+/-2 C. The duration of the applied voltage was 10 minutes. The magnitude of the applied voltage was adjusted so that each arrester was heated to the same final temperature at the completion of the heating test. Upon achieving the desired disc temperature, thermocouples were attached to a data logger and temperature was monitored continuously for 2 hours. Test Results Figure 1 displays the cooling curves for the 10 KA Class 2 72 kv rated arrester and the 12 kv rated arrester prorated section. Examination of the cooling curves for the 12 kv rated prorated arrester section and the 72 kv rated arrester confirms that the cooling rate for the externally insulated section is slower than that of the 12 kv rated arrester, and durability tests performed on the 12 kv rated arrester section will simulate durability and thermal conditions for the 12 kv rated arrester. EU1515-H

22 Figure 1 Comparison of Cooling Curves for Prorated Section Versus 57 kv MCOV Arrester Cooling Time- Minutes Prorated Section 57 kv MCOV Arrester EU1515-H

23 IEC Type Test Report Report No. EU1515-H-06.1 Polymer Arrester 10,000 A Line Discharge Class 2 SWITCHING SURGE OPERATING DUTY TEST IEC CLAUSE This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

24 Sample Preparation IEC Type Test Report SWITCHING SURGE OPERATING DUTY TEST IEC CLAUSE Switching surge operating duty tests were performed on three prorated test sections prepared based on the thermal equivalency test results. Each section consisted of two (2) 50 mm diameter, 40mm long MOV discs. The MOV discs for each sample were selected to represent the lowest acceptable reference voltage level. Test Procedure Prior to the conditioning series, reference voltage of each section was measured at 7 ma reference current and room temperature. Initial 10 ka, 8/20 µs residual voltage of each section was also measured. Conditioning tests consisted of two test series. The first conditioning test series subjects each test section to (20) 10 ka, 8/20 µs lightning current impulses, divided into four groups of five impulses. The interval between impulses was between 50 and 60 seconds and the interval between groups was between 25 and 30 minutes. Test sections were energized at 60 Hz voltage of 1.2 U c during each group testing. The impulses were timed to occur 60 before the crest of the 60 Hz voltage with the same polarity of the impulse. The second conditioning test series consisted of subjecting each test section to (2) 100 ka 4/10 surges, with the section allowed to cool to ambient temperature between discharges. Tests were performed in still air at ambient temperature of 20 C. During the operating duty test, each section was subjected to two (2) long duration current discharges. Prior to the second discharge, each prorated section was placed in an oven and heated overnight to 60 ± 3 C. Within 100 milliseconds of the second long duration current impulse, rated voltage (U r ) was applied to each section for 10 seconds immediately followed by U c for 30 minutes. During the recovery period, power dissipation of each section was monitored to demonstrate thermal stability. After this test sequence, each section was allowed to cool to ambient temperature and then its 10 ka, 8/20 µs discharge voltage was measured. EU1515-H

25 Test Results Initial measurements and parameters of the prorated sections are shown in Table 1. Table 1. Initial Measurements and Parameters of Prorated Sections. Test Parameters Section 1 Section 2 Section 3 Initial Residual Voltage 10 ka, 8/20 µs Reference Current (ma) I ref Reference Voltage (kv peak) U ref Maximum COV (kv rms): U c Maximum Rating (kv rms): U r A summary of results of the three sections for the 20-shot conditioning test is shown in Table 2. The sections were exposed to still air at ambient temperature of 20 C during the test. Table Shot Conditioning Test. IMPULSE NUMBER SECTION 1 I (ka) SECTION 2 I (ka) SECTION 3 I (ka) Cool Cool Cool Subsequent to the completion of the 20 shot test, each section was subjected to two (2) 100 ka nominal 4/10 µs conditioning impulses. Table 3 shows test results of the first and EU1515-H

26 second 100 ka impulses for the three sections. Figure 1 shows oscillograms of the test for the three sections. Table ka, 4/10 µs Conditioning Test. IMPULSE SECTION 1 I (ka) SECTION 2 I (ka) SECTION 3 I (ka) Section 1, Shot 1, Discharge Current = ka Section 1, Shot 2, Discharge Current = ka EU1515-H

27 Section 2, Shot 1, Discharge Current = ka Section 2, Shot 2, Discharge Current = ka Section 3, Shot 1, Discharge Current = ka EU1515-H

28 Section 3, Shot 2, Discharge Current = ka Figure ka nominal 4/10 µs impulses. Prior to the switching surge portion of the operating duty test, the test sections were preheated to 60 deg C. Immediately after removal from the oven, the prorated sections were subjected to two long duration discharges spaced one minute apart. Table 4 summarizes the 2-shot discharge duty on the three test sections. Table 4 #1 #2 #3 Shot # Current Amps Volts kv Energ y kj Current Amps Volts kv Energ y kj Current Amps Volts kv Energy kj Table 5 summarizes the results of the 10 second rated portion of the operating duty test. Time (Second) Table Second Rated Voltage Test. Section 1 Section 2 Section 3 Rated Current Time Rated Current Time Rated Ur I (Second) Ur I (Second) Ur (kvc) (ma) (kvc) (ma) (kvc) Current I (ma) EU1515-H

29 Figure 2 shows a typical oscillogram of the long duration current discharged thru the prorated test sections during the switching surge operating duty portion of the ODC test. The time sweep on the upper long duration trace is.60 milliseconds per major division. The middle trace displays the 10 rated voltage portion of the test while the bottom trace integrates the energy absorbed during the 10 second test. Figure 2 Thermal stability defined by Section of the Standard was verified during the recovery period by continuous monitoring of power dissipation of the test sections. Results are summarized in Table 6. Typical recovery voltage and current oscillograms for each section are shown in Figure 3. The results indicated that all three sections demonstrated thermal stability. RECOVERY TIME (Min) Table 6. Power Dissipation in Thermal Models during Recovery. SECTION 1 SECTION 2 WATTS LOSS WATTS LOSS (W) (W) SECTION 3 WATTS LOSS (W) EU1515-H

30 Results of the residual voltages measured before and after the operating duty test are summarized in Table 7. The maximum change of the residual voltages of the three sections is less than the permissible value of 5 %. Table 6. Summary of Residual Voltage Measurements. SECTION RESIDUAL VOLTAGE (kv) Change Before After (%) Test Summary The three prorated sections successfully passed the switching surge operating duty test per Section of IEC Standard , Disassembly revealed no evidence of puncture, flashover or cracking of the non-linear metal oxide resistors in any of the three sections. All three sections demonstrated thermal stability. The change of residual voltage measured before and after the test is less than 1 %, below the allowed 10% limit. The three test sections have successfully fulfilled the operating duty test requirements for the 10 ka Class 2 arrester. EU1515-H

31 IEC Type Test Report Report No. EU1515-H-07.1 Polymer Arrester 10,000 A Line Discharge Class 2 PARTIAL DISCHARGE IEC CLAUSE 8.8 This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard Surge Arresters- Part 4: Metal oxide surge arresters without gaps for ac systems Dennis W. Lenk Principal Engineer Date: 8/27/2012

32 TITLE: Internal Partial Discharge IEC Type Test Report PARTIAL DISCHARGE IEC CLAUSE 8.8 TEST OBJECTIVE: Measure internal partial discharge of longest 10 ka Class 2 polymer-housed arrester. TEST SAMPLES: Testing was performed on the largest electrical unit (72 kv rated). TEST PROCEDURE: Per the specified test procedure, the arrester was energized at rated voltage for 2-10 minutes and then the voltage was reduced to 1.05 times COV. At this voltage, the arrester partial discharge was measured TEST RESULTS: The 57 kv COV arrester was energized at 59.9 kvrms and had a measured partial discharge of 2 picocoulomb, below the allowed 10 picocoulomb limit. Background PD was 1-2 picocoulomb. CONCLUSION: The 72 kv rated arrester passed the specified partial discharge testing, validating the 10 ka Class 2 design meets the IEC partial discharge requirements. EU1515-H

33 IEC Type Test Report Report No. EU1515-H-08.1 Polymer Arrester 10,000 A Line Discharge Class 2 POWER FREQUENCY VOLTAGE VERSUS TIME CHARACTERISTIC IEC ANNEX D This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

34 IEC Type Test Report POWER FREQUENCY VOLTAGE VERSUS TIME CHARACTERISTICS IEC ANNEX D The claimed power frequency voltage capability for the IEC 10 ka Class 2 design is summarized in Figure 1. The test procedure is listed below: 1. Preheat to 60 ± 3 C; 2. Apply two long duration discharge spaced 60 seconds apart; 3. Within 100 ms of the second discharge, apply the selected p. u. of voltage for a time greater than the abscissa value on Figure 1; 4. Apply the recovery voltage (U c ) for 30 minutes and monitor the power loss to confirm stability. The 10 ka Class 2 arrester data points met the claimed TOV requirements specified by the TOV withstand curve. IEC Class 2 Arrester Power Frequency Voltage versus Time Characteristic Per Unit times Uc Time- Seconds Data Points IEC Class 2 Power Frequency Curve Figure 1. Power frequency voltage versus time characteristic EU1515-H

35 IEC Type Test Report Report No. EU1515-H-09.1 Polymer Arrester 10,000 A Line Discharge Class 2 SHORT CIRCUIT TEST ANNEX N This report records the results of this type test made on 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. D. W. Lenk Principal Engineer Date: 8/27/2012

36 IEC Type Test Report SHORT CIRCUIT TESTS ANNEX N TITLE: Short Circuit Test For Polymer Housed Station Class Arrester: TEST OBJECTIVE: Short Circuit tests were performed on the 10 ka Class 2 polymerhoused Station Class arrester per ANNEX N of IEC standard. TEST SAMPLES: Tests were performed on fusewire shorted and overvoltage failed arresters as defined in Table N.2 of the referenced standard. Pressure relief tests were performed on the longest mechanical section, as required in Clause N of the standard. TEST PROCEDURE: As required, two test samples for the high current test were assembled with a fuse wire oriented axially between the mov disc stack and the fiberglass-epoxy wrap. These samples were subjected to the full offset current test. In addition, six samples represented standard production arresters. These samples were failed using the specified 2-source failure mode procedure. All tests were performed at full voltage. Therefore, the prospective fault current, as measured during the bolted fault test on the generator, is the claimable pressure relief current capability of the design. It should be noted that the IEEE test is similar to that defined in Annex N of new IEC standard, except reduced level high current testing was performed only at 20 ka, instead of 25 and 12kA as required in the IEC standard. Also note that the IEEE testing is performed on (8) total arresters versus only (4) per IEC. TEST RESULTS: The following table summarizes the results these tests which validated the claimed maximum 40 ka rms symmetrical, 12 cycle fault current withstand capability of this design, with an applied ratio of 1.55 between total asymmetrical to symmetrical rms currents. This corresponds to a 2.6 ratio, in the first half loop of fault current, between the crest asymmetrical to rms symmetrical current, i.e., full offset. In addition to testing at the claimed maximum capability, tests were also performed, using the 2-source procedure, at half the claimed capability and at 600 amps as specified in Table 14 of the standard. Calibration Test 41.0 ka rms Symmetrical 107 ka peak Asymmetrical EU1515-H

37 Sample # Failure Mode Minimum Test Duration-seconds Condition of Module/Polymer Housing After Test 1 Fuse Wire.21 Module Intact/Housing Separated 2 Fuse Wire.21 Module Intact/Housing Separated 3 2-Source.21 Module Intact/Hsg Torn but in Place 4 2-Source.21 Module Intact/Hsg Torn but in Place Calibration Test 19.9 ka rms Symmetrical No Asymmetrical Requirement Sample # Failure Mode Minimum Test Duration-seconds Condition of Module/Polymer Housing After Test 5 2-Source.2 Module Intact/Hsg Torn but in Place 6 2-Source.2 Module Intact/Hsg Torn but in Place Calibration Test 600 A rms Symmetrical No Asymmetrical Requirement Sample # Failure Mode Minimum Test Duration-seconds Condition of Module/Polymer Housing After Test 7 2-Source 1.0 Module Intact/Hsg Torn but in Place 8 2-Source 1.0 Module Intact/Hsg Torn but in Place CONCLUSION: The eight test arresters assembled with the longest mechanical unit met the test evaluation criteria as specified in Clause N In all tests, the arrester module remained intact after the completion of each test. The flexible polymer housing wall section split, as intended, on all samples to allow venting of internal arcing gases to the outside of the arrester. In all cases, flames associated with the fault current test extinguished immediately after completion of the test, well within the allowed 2 minute duration. These tests have demonstrated the capability of the IEC 10 ka Class 2 arrester design to successfully discharge a maximum claimable 40 ka rms symmetrical fault current. EU1515-H

38 IEC Type Test Report Report No. EU1515-H-10.2 PVI-LP Base Mounted Polymer Arrester 10,000 A Line Discharge Class 2 Bending Moment This report records the results of type tests made on 10 ka Line Discharge Class 2 Type PVI-LP arresters, rated up to 72 kv. Tests were performed in accordance with procedures of IEC Standard , Ed. 2.2, , Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. To the best of our knowledge and within the usual limits of testing practice, tests performed on these arresters demonstrate compliance with the relevant clauses of the referenced standard. Dennis Lenk Principal Engineer Chris Kulig Product Engineer Date: 11/30/2012

39 IEC TYPE TEST REPORT Bending Moment TESTS PERFORMED: The bending moment test was performed on three test samples as described in Clause of IEC , for polymer-housed arresters without enclosed gas volume. Prior to the mechanical testing, the test samples were subjected to electrical tests to establish initial watts loss, partial discharge, and residual voltage values. Tests were performed per Attachment A, Chart M6 of the standard. Per Section a), after electrical testing, each of the three test samples was subjected to 1000 cycles of bending moment load. Each cycle consisted of loading the samples from zero to the arrester s specified long-term load (SLL), followed by loading to the SLL in the opposite direction, then returning to zero load. This procedure was repeated 1000 times on each arrester at an approximate frequency of 3 Hz. The maximum deflection (for each sample during the test) and the un-loaded residual deflection (at the completion of the test) were recorded. Per the M6 Chart, after the three samples completed the 1000 cycle test, two of the samples were subjected per Section a) to the specified short-term load (SSL) bending moment test. Each of these two test units was securely mounted to the horizontal base of the test equipment and lateral (horizontal) loading was applied to the free end of the unit, in a direction perpendicular to the axis of the unit, at a rate necessary to reach the bending moment corresponding to the specified short-term load (SSL) in approximately 50 s. The load was then maintained at this level for about 90 s. Deflection was measured prior to release of the load. After release of load, the test sample was inspected to verify that no mechanical damage had occurred, and the load-deflection curve was examined to verify that there was no discontinuity which might indicate mechanical damage. As with the 1000 cycle test, the unloaded residual deflection was measured on each sample. The third sample from the 1000 cycle test was subjected to mechanical/thermal preconditioning per Section This test procedure loads the test sample to its specified long-term load (SLL) while the arrester is being thermally cycled from -40 to +60 degree C. The final stage of the Bending Moment test (section ) consisted of submersing the three test samples under boiling salt water for 42 hours. At the conclusion of the boiling water test, electrical tests were repeated on each sample (per section ) to verify that any changes were within allowed limits, and a visual inspection was made to verify that no mechanical damage had occurred. TEST RESULTS: Per Clause of IEC Ed Standard, preliminary electrical tests were performed on the three PVI-LP 24.4 kv Uc arrester samples. Table 1 summarizes the results of these preliminary electrical tests. EU1515-H

40 Table 1 Test Parameter Sample #1 Results Sample #2 Results Sample #3 Results Initial Watts Loss at Uc Residual Voltage at 10 ka kvc Partial Discharge at 1.05*Uc- pc <2 <2 <2 Next, per Clause a), each test sample was subjected to the 1000 cycles of bending moment test. Each cycle consists of loading the arrester from zero to its specified long-term load (SLL) in one direction, followed by loading to SSL in the opposite direction, then returning to zero load. The tested SLL load applied to each test sample was 180 Nt-M (1,600 in-lb). Figure #1 plots the deflection versus time characteristic curve for the required 1000 test cycles on sample #1. This plot is typical of those recorded on the samples # 1 and 3. There was no recordable residual deflection on the three test samples after release of the top end applied load. Figure 1 Per step 2.1 of Clause a), test samples # 1 and 2 were rigidly base mounted in a cantilever fixture and loaded within 30 to 90 seconds to the arresters claimed specified 340 Nt-M (3010 in-lb) short-term load (SSL) and maintained at this moment load for 60 to 90 seconds, after which the applied load was slowly removed. Figure #2 shows the test sample s top end deflection as plotted against time for test sample #2, typical of that measured on sample #1. The maximum recorded top end deflection under load was.073 inches while the recorded residual deflection was.05 inches. Figure 2 EU1515-H

41 Figure 3 shows moment applied to the top end of arrester #1 during the SSL loading cycle. Figure 3 EU1515-H

42 Per step 2.2 of Clause a), test sample #3 was subjected to thermo-mechanical preconditioning as specified in Clause During this test, the test sample is placed inside a thermal cycling oven which loads the top end of the sample to its claimed 180 Nt-M SLL. Figure 4 shows the sample s load and temperature cycle. At the completion of the specified mechanical loading, samples 1, 2, and 3 were placed into boiling NaCl water for 42 hours, as specified in Clause After 42 hours exposure, the water bath temperature was reduced to 50 deg C. After stabilizing in 50 deg C water bath, the test samples were dried off and 60 Hz electrical tests were repeated per Clause Table 2 Test Parameter Sample #1 Sample #2 Sample #3 Final Watts Loss at Uc Watts Loss % Increase Final PD at 1.05*Uc-pC EU1515-H

43 Figure 4 As specified in Clause , to further confirm the electrical integrity, each test sample was subjected to the following test sequence Final Test Steps Test Description Test Sample #1 Test Sample #1 Test Sample #1 1 7 ma Uref kvc /20 10 ka IR-kVc /20 10 ka IR-kVc ma Uref kvc Figures 4 thru 9 show oscillograms of the 10 ka residual measured during steps 2 and 3 for each test sample. Figure 4 Sample 1 Residual Voltage Shot 1 EU1515-H

44 Figure 5 Sample 1 Residual Voltage Shot 2 Figure 6 Sample 2 Residual Voltage Shot 1 EU1515-H

45 Figure 7 Sample 2 Residual Voltage Shot 2 Figure 8 Sample 3 Residual Voltage Shot 1 EU1515-H

46 Figure 9 Sample 3 Residual Voltage Shot 2 EU1515-H

47 CONCLUSION: Three Type PVI-LP 24.4 kv Uc arresters were subjected to bending moment tests as defined in Clause of IEC Ed Standard. Specified short-term load (SSL) testing was successfully completed at 340 Nt-M, while specified long-term load (SLL) testing was successfully completed at 180 Nt-M. 60 HZ electrical tests, performed on each arrester prior to and after the mechanical and moisture ingress tests, confirmed arrester PD levels below the allowed 10 pc and watts loss was <1%, well below the allowed 20% change. 10 ka residual voltage tests also confirmed the electrical integrity of the three test arresters. In summary, the three 10 ka Class 2 type PVI-LP test arresters successfully passed the bending moment test at the designated SLL and SSL levels. Attachment A EU1515-H

48 EU1515-H

49 IEC Type Test Report Report No. EU1515-H-11.1 Base Mounted Polymer Arrester 10,000 A Line Discharge Class 2 MOISTURE INGRESS This report records the results of this type test made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Dennis. W. Lenk Principal Engineer Date: 8/27/2012

50 IEC Type Test Report MOISTURE INGRESS TEST Introduction IEC CLAUSE Tests were performed in accordance with clause of IEC Standard The purpose of this test was to verify the seal integrity of the arrester polymer housing after being subjected to a terminal torque and thermomechanical test, followed by the boiling water immersion test. Sample Preparation A 19.5 kv MCOV Class 2 arrester was assembled for this test. Test Procedure The test arrester was subjected to PD, watts loss, and discharge voltage tests prior to the bending moment and boiling water immersion test. The mechanical portion of the test consisted of first applying a 40 ft-lb torque to the arrester end terminals for 30 second duration. The test arrester was then placed inside a thermal cycling oven and mechanically loaded to its 1,600 in-lb continuous cantilever rating. The load application and test temperature is shown on the attached figure. After completion of the mechanically loading portion of the test procedure, the water immersion portion of the bending moment test was performed per para and EU1515-H

51 consists of placing the mechanically stressed arrester into a boiling salt water bath for 42 hours, after which the same is cooled to room temperature and electrical tests are repeated. Test Results Subsequent to the bending moment test, the test arrester was subjected to 42 hours immersion in the specified salt water bath. After removal from the bath, the arrester was electrically tested. The following table shows the results of the final electrical testing, compared with initial measurements. Sample No. Initial Uc Final Uc Initial 1.05 times Uc (pc) Final 1.05 times Uc (pc Initial 10 ka Residual Voltage kvc Final 10 ka Residual Voltage kvc <1 < Test Conclusions Visual inspection confirmed that there was no damage to the arrester as a result of the 1,600 in-lb thermomechanical conditioning, followed by the water immersion test. Electrical tests performed before and after testing also confirmed the electrical integrity of the test arrester. The 15% watts loss increase was below the allowed 20% limit. Partial discharge was unchanged at less than 1 pc, below the allowed 10 pc limit. The measured 10 ka residual voltage was almost unchanged, below the allowed 5% limit. Therefore, the IEC Class 2 base mounted arrester design successfully passed the moisture ingress test, as defined in IEC standard. EU1515-H

52 IEC Type Test Report Report No. EU1515-H-12.1 Base Mounted Polymer Arrester 10,000 A Line Discharge Class HOUR WEATHER AGING TEST This report records the results of this type test made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2001 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Dennis. W. Lenk Principal Engineer Date: 8/27/2012

53 IEC Type Test Report 5000 HOUR WEATHER AGING TEST Introduction IEC CLAUSE Tests were performed in accordance with clause of IEC Standard , The purpose of this test was to verify the electrical integrity of the arrester polymer housing after being subjected to 5000 hours in a weathering chamber. Sample Preparation A 29 kv MCOV IEC base mounted Class 2 arrester was assembled for this test. Test Procedure The 5000 hour weathering test was performed per IEC test procedure with the arrester energized at 30.6 kv rms over the entire 24 hour test cycle. Salt fog salinity was 7 kg per cubic meter. Test Results The test arrester successfully withstood the 5000 hour aging test with no evidence of surface tracking, erosion, or puncturing. In addition, electrical reference voltage changed from 57.0 to kvc, well within the allowed 5% variation. Finally, partial discharge measured less than 3 picofarad, well below the allowed 10 pc limit. Test Conclusions The IEC Class 2 base mounted arrester design successfully passed the 5000 hour weathering test, as defined in IEC standard. EU1515-H

54 IEC Type Test Report Report No. EU Base Mounted Polymer Arrester 10,000 A Line Discharge Class HOUR SALT FOG TEST This report records the results of this type test made on IEC 10 ka Class 2 arresters rated 3 thru 72 kv in accordance with IEC Standard , 2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems. Dennis. W. Lenk Principal Engineer Date: 8/27/2012

55 IEC Type Test Report 1000 HOUR SALT FOG TEST Introduction IEC CLAUSE Tests were performed in accordance with clause of IEC Standard , The purpose of this test was to verify the electrical integrity of the arrester polymer housing after being subjected to 1000 hours in a salt fog environment. Sample Preparation A 24.4 kv MCOV IEC Class 2 arrester was assembled for this test. Test Procedure The 1000 hour weathering test was performed per clause of IEC Salt fog salinity was 10 kg per cubic meter. Test Results The test arrester successfully withstood the 1000 hour salt fog exposure test with no evidence of surface tracking, erosion, or puncturing. The following table summarizes the results of electrical tests performed on the arrester before and after the salt fog exposure. Sample No. Initial 1.05 times Uc (pc) Final 1.05 times Uc (pc Initial 7 ma reference voltage kvc Final 7 ma reference voltage kvc 1 <1 < Test Conclusions Reference voltage changed less than 1% as a result of salt fog exposure. No tracking, shed puncture or significant erosions were evidenced by visual inspection carried out at the end of the test. The IEC Class 2 arrester design successfully passed the 1000 hour salt fog test, as defined in IEC standard. For details of test report, reference CESI AT-A3/ test report. EU