FFXI Haven - #1.
b.Regulation. Transformers can maintain an acceptable voltage ratio of about a 2 percent voltage drop from zero to rated output in most cases. Most distribution transformers and smaller power transformers have tapped windings, which permit adjusting the output voltage to broaden the range of primary voltage inputs. The transformer will have a manual tap changer, which can be operated if the transformer is de-energized. However, on substations which serve varying loads, such as pumping facilities, or on large installations with long primary feeder lines, taps may not provide sufficient voltage regulation and other means are necessary. (1)Load-tap-changing (LTC). This feature installed on a transformer provides automatic tap changing under load, and normally varies the voltage to plus or minus 10 percent of the system's rated voltage by changing tap connections using a motor-driven, tap-changing switch. (2)Voltage regulators. Sometimes voltage regulation is needed and the system transformers do not include the LTC feature. Voltage regulators are used to supply the control for the variations in load. A voltage regulator needs similar servicing to that required for a power transformer. A step-voltage regulator operates on the same principal as the LTC mechanism. 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 |
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