DESIGN TEST REPORT. GAMMA Insulators 7061R-70 ANSI Class 55-5 Pin Type Insulator.

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1 December 6, 2010 DESIGN TEST REPORT Insulator Reference: GAMMA Insulators 7061R-70 ANSI Class 55-5 Pin Type Insulator. Electrical Design Tests 1. Low-Frequency Dry Flashover Test: Three insulators were selected at random and were subjected to a Low-Frequency Dry Flashover Test as required in section of ANSI C29.5. The tests were performed in accordance with section 4.2 of ANSI C29.1. The following results were obtained: Samples. Low-Frequency Dry ANSI Rated Dry ANSI Minimum Dry Flashover Value kv Average Dry Flashover = 92 kv. The average dry flashover value of the three insulators must equal or exceed 95% of rated dry flashover value of 80 kv or 76 kv. 2. Low-Frequency Wet Flashover Test Three insulators were selected at random and were subjected to a Low-Frequency Wet Flashover Test as required in section of ANSI C29.5. The tests were performed in accordance with section 4.3 of ANSI C29.1. The following results were obtained:

2 Low-Frequency Wet ANSI Rated wet ANSI Minimum wet Flashover Value kv Samples Average Wet Flashover = 50 kv The average wet flashover value of the three insulators must equal or exceed 90% of the rated wet flashover value of 45 kv or 41 kv. 3. Critical Impulse Flashover Test-Positive: Three insulators were selected at random and were subjected to a Critical Impulse Flashover Test of Positive Polarity as required in section of ANSI C29.5. The tests were performed in accordance with section 4.7 of ANSI C29.1. The following results were obtained: Samples. Critical Impulse Flashover Positive kv. ANSI Rated Dry ANSI Minimum Dry Flashover Value.kV Average Critical Impulse Flashover Positive = 148 kv. The average positive critical impulse flashover value of the three insulators must equal or exceed 92% of the rated positive critical impulse flashover value of 130 kv or 120 kv.

3 4. Critical Impulse Flashover Test-Negative: Three insulators were selected at random and were subjected to a Critical Impulse Flashover Test of Negative Polarity as required in section of ANSI C29.5. The tests were performed in accordance with section 4.7 of ANSI C29.1. The following results were obtained: Samples. Critical Impulse Flashover Negative ANSI Rated Dry ANSI Minimum Dry Flashover Value.kV kv Average Critical Impulse Flashover Negative = 159 kv. The average positive critical impulse flashover value of the three insulators must equal or exceed 92% of the rated negative critical impulse flashover value of 150 kv or 138 kv. 5. Radio-Influence Voltage Test: Five insulators were selected at random and were subjected to a Radio Influence Voltage Test as required in section of ANSI C29.5. The tests were performed in accordance with section 4.9 of ANSI C29.1. The following results were obtained: Applied Voltage kv Radio-Influence Voltage Microvolts at 1000 khz Sample 1 Sample 2 Sample 3 Sample 4 Sample µv 4 µv 4 µv 4 µv 4 µv The radio-influence voltage obtained on each of the five insulators should be equal to or less than 100 microvolts at an applied voltage of 15 kv. 6. Cantilever Strength Test

4 Five insulators were selected at random and were subjected to a Cantilever Strength Test as required in section of ANSI C29.5. The tests were performed in accordance with section of ANSI C29.1. The following results were obtained: Sample. Cantilever Strength (lbs.) 1 4, , , , ,456 Average Cantilever Strength: 4,125 The average cantilever strength of the five units tested must equal or exceed the rated cantilever strength of 3,000 lbs. No insulators shall have a cantilever strength below 85% of the rated value of 3,000 lbs. or 2,550 lbs. Thermal Shock Test: Five insulators were selected at random and were subjected to a thermal shock test as required in section of ANSI C29.5. The tests were performed in accordance with section 5.5 of ANSI C29.1. The insulators were tested for ten complete cycles, the hot water bath temperature was approximately 150 F, and the cold water bath temperature was approximately 39 F. Each insulator subjected to the thermal shock test shall be electrically sound on completion of the test when subjected to a dry flashover test, the flashover shall be external to the unit, i.e. flashover shall occur external to the insulator. Frank Escobar O Product Engineer GAMMA INSULATORS

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