. Journal of electricity, power, and gas . for laundry purposes. Switches of this kind served their purpose well, and are even now in use after yearsof service, but where they are called upon to breakheavy loads, such as come on at times of short-circuit,they are apt to throw the oil out of the container whenoperated. To overcome this trouble, we designed a four-break switch, along practically the same lines, but witha considerably greater depth of oil over the switches siinilar to the one shown in Figs, iand 2, have been in service in some of our largestpower houses for se
. Journal of electricity, power, and gas . for laundry purposes. Switches of this kind served their purpose well, and are even now in use after yearsof service, but where they are called upon to breakheavy loads, such as come on at times of short-circuit,they are apt to throw the oil out of the container whenoperated. To overcome this trouble, we designed a four-break switch, along practically the same lines, but witha considerably greater depth of oil over the switches siinilar to the one shown in Figs, iand 2, have been in service in some of our largestpower houses for several years, and they have neverfailed to open the line under all conditions of short-circuit. The particular features which recommend thisswitch are: 1. The absence of any insulating material thatmight become saturated with oil and catch fire eitherfrom leakage or from an arc. 2. The insulation of the switch from the ground,thereby affording the greatest protection against break-downs due to surges or other high-voltage disturbances U—. TOP REMOVED PLAN VIEW Fig. 2. Plan of High-Tension Switch. when the switch is open. 3. A constant depth of oil over the contacts at allpositions of the blades. 4. The comparatively small amount of space takenup by the switch. We have never attempted to operate any of thesehigh-tension switches either automatically or by anyelectric or pneumatic means, preferring rather to keepto the more positive hand-lever control. This controlhas generally proven quite satisfactory, but we havejust installed some reverse current relays to be used inconnection with the automatic operation of switches onlines which are tied together at both ends. We haveyet to learn to just what extent these can be success-fully employed, on account of the inherent weaknessof alternating-current reverse-current relays, whoseoperation is dependent on both current and voltage,and the fact that in cases of severe trouble the voltagemay drop so low that the relay will be inoperat
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
