FFXI Haven - Ваш Источник #1.

(2) Steady-state leakage current. The initial value will decrease to a steady-state value consis­tent with the system's charging current. If correctly done, only the volumetric leakage current will be left. This current is of primary interest in the evalu­ation of an insulation's condition. The decay of tran­sient current time is known as the stabilization time.

(3) Constant leakage current. In some cases, a constant leakage current is measured. This is main­tained by increasing the test voltage in a manner which maintains the same current.

e. Tests for relative cable condition. Two tests are used to determine the relative cable condition as an identification of its dielectric strength under medium-voltage tests.

(1) Leakage current versus voltage test. In this test, equal voltage steps are applied until the maxi­mum test voltage is reached or an indication of a breakdown voltage is indicated. It is usually recom­mended that no less than five and, if possible, eight equal steps be made with no less than 1 and up to 4 minutes stabilization time allowed. The steady-state leakage current is plotted against the applied voltage. As long as the slope of the plot is the same, the insulation is in good condition. If the leakage current increases noticeably, so will the slope of the curve.

BACK | NEXT

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