This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...pair of voltage leads which give about 86 per cent power-factor lead on the meter. The second method is to use a single-phase, indicating wattmeter, and with a lagging power factor on the line between 50 and 100 per cent select the pair of voltage leads which give the highest reading. Just after making the above test ... Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...pair of voltage leads which give about 86 per cent power-factor lead on the meter. The second method is to use a single-phase, indicating wattmeter, and with a lagging power factor on the line between 50 and 100 per cent select the pair of voltage leads which give the highest reading. Just after making the above test is the proper time to see that the contacts are held open. If they close, the voltage leads must be reversed. The above discussion is not based solely upon the mathematical study of the problem, but is the result of actual tests made on a number of transmission lines where the reverseenergy relays connected according to the old method have not given satisfactory service. Experiments have shown that this method of connection should also be used on systems having a grounded neutral. This connection (with the current 30 deg. ahead of the voltage) must be used with care on an ungrounded neutral system having a heavy charging current to ground. Difficulty may also be encountered on some systems where the load current is leading. But in both these cases the short-circuit currents will be much greater than any possible leading current and no difficulty due to incorrect operation of the reverse-power relays will be experienced if the excesscurrent elements are adjusted to operate only on short-circuits. Determining Phase Rotation.--In order to function correctly, h I MffT' the directional relays must have the current lead 30 deg. and not lag 30 deg., and in order to obtain this condition it is necessary to determine the phase rotation. This cannot be determined from an ordinary inspection of the three wires, but is easily determined by small patented devices now on the market or by a simple apparatus consisting of two ordinary incandescent lamps and a ... Read Less
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