FFXI Haven - #1.
a.Damaging conditions. Most pole-line insulator damage results from gun shots, lightning or contamination flashovers, and wind damage. b.Understanding insulator provisions. Insulators provide mechanical and electrical performance values to meet requirements imposed by different applications. Mechanical performance dictates to a certain extent the type of insulator most suitable for the line being supported. Electrical performance requirements are mainly based on operating voltage and the degree to which area conditions affect the electrical performance. 4-46. Types of pole-line insulators. Insulators used are the pin, post, and suspension type for primary lines; the spool, pin, and knob type for secondary lines; and the guy strain type for guys, as covered in section XIII. Figure 4-17 shows the different types normally used on facilities covered by this manual. a. Pin insulators. This insulator gets its name from the fact it is supported on a pin. The pin is usually attached to a wood crossarm. Steel pins should always be used, as wood pins deteriorate rapidly from the leakage currents through the insulator. Where crossarm construction is being phased out, pin insulators are used less often on primary lines. They are available for secondary lines, but should only be used if the secondary line is mounted on crossarm construction. Easy Access To All Pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 |
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