Knowledge is power essay

  The electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose. The instrument transformers like voltage transformer and current transformer are used for connecting the electrical instruments to the measuring instruments.These transformers reduce the voltage and current from high value to the low value which can be measured by conventional instruments. The construction of the current and potential transformer is similar as both have the magnetic circuit in their primary and secondary winding. But they are different in the method of working. There are several types of differences between the voltage and the current transformer. One of the major difference between them is that the current transformer converts the high value of current into low value whereas the potential or voltage transformer converts the high value of voltages into low voltage. Some other differences between the current and the potential transformer are...

Minimum Electrical Clearance As Per BS:162. INDOOR Voltage in KV Phase to earth in mm Phase to phase in mm 0.415 15.8 19.05 0.600 19.05 19.05 3.3 50.8 50.8 6.6 63.5 88.9 11 76.2 127.0 15 101.6 165.1 22 139.7 241.3 33 222.25 355.6 Minimum Electrical Clearance As Per BS:162. OUTDOOR Voltage in KV Phase to earth in mm Phase to phase in mm 6.6 139.7 177.8 11 177.8 228.6 22 279.4 330.2 33 381 431.8 66 685.8 787.4 110 863.6 990.6 132 1066.8 1219.2 220 1778 2057.4   Minimum Working Clearance: OUTDOOR SWITCHYARD Voltage in KV To ground in mm Between section(mm) 11 2750 2500 33 3700 2800 66 4000 3000 132 4600 3500 220 5500 4500   Minimum Ground Clearance As Per IE-1956(Rule 77) Voltage in KV To ground in mtr 132 6.10 220 7.00 400 8.84 800 12.40     Minimum Clearance between Lines Crossing Each Other (IE-1957) System Voltage 132KV 220KV 400KV 800KV Low & Medium 3.05 4.58 5.49 7.94 11-66KV 3.05 4.58 5.49 7.94 132KV 3.05 4.58 5.49 7.94 220KV 4.58 4.58 5.49 7.94 400KV 5.49 5....

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