By J. H. Gridley, P. Hammond

ISBN-10: 008012111X

ISBN-13: 9780080121116

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600) = 400. This gives R = 1200 i3. 5 An overhead line of surge impedance 400 ß is connected to a transformer by a short length of cable, 0-1 mile long, having a surge impedance 100 Ω. A surge (which may be taken as a step wave) of 100 kV travels along the line towards the cable. Explain how the cable modifies the wave form of the surge arriving at the transformer. Illustrate by drawing a voltage diagram corresponding to instants 0-5, 1-5, and 2-5 /xsec after the arrival of the surge at the junction between line and cable.

In addition, transformers are particularly susceptible to da­ mage by voltages with steeply rising wave fronts. d. 32 ELECTRICAL TRANSMISSION LINES becomes excessive. For large transformers more elaborate precautions may be justifiable. (ii) Since the surge impedance of cable is only about one-fifth that of overhead line, some relief to terminal equipment may be obtained if overhead lines are connected to substations by lengths of cabled This follows from the fact that the lower surge impedance of the cable will result in the initial voltage transmitted towards the station being considerably less than that incident on the line-cable junction.

A fault of zero impedance occurs at Β and the resulting fault current is subsequently cleared by a circuit breaker which "chops" the current abruptly from 700 A to zero. Determine the surge voltages and currents which are initiated in the line by the interruption of the fault current. ( I . E . E . , Pt. I l l , Oct. ) This problem is a variation on those solved previously, in that a current of 700 A flows along the line, from A to B, in the steady state. This current is suddenly reduced to zero by the operation of the circuit breaker, and it is the sudden reduction which is propagated, as shown in Fig.

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Principles of Electrical Transmission Lines in Power and Communication by J. H. Gridley, P. Hammond


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