Niagara Falls 100.000-Hp. Development

46 ] Niagara Falls 1 00,000 Hp. Development FIG. 64—SCHEME OF CONNECTIONS AT ECHOTA SUBSTATION, SHOWING UNIT LAYOUT Lines from station No. 3 ext. are shown at the bottom. In these circuits but not shown in illustration are choke coils, lightning arresters and disconnecting switches. ers. All relays are of the Westinghouse induction type, the 5-amp. size being used for overload and the 1-amp. size for differential and ground protection. A somewhat unusual feature in connection with the relay system is the installation of annunciators on the switchboard with the drops connected in series with the tripping circuits of the various relays. By this means it is possible to know at once upon the tripping out of a circuit breaker just which relay was responsible. This immediately gives an indication of the nature and in certain cases of the location of the trouble. It also furnishes the means of keeping tabs on the operation of the relays. Although the station has been in opera- tion only a few months, the value of this feature has already been amply demonstrated. In the equipment of this station the Westinghouse Electric & Manufacturing Company furnished all of the switchboards and all of the oil switches with the exception of those for one unit bay, also current and potential transformers, choke coils, motor-generator sets and storage battery. The General Electric Com- pany furnished oil switches for one bay and the light- ning arresters. Bus supports and disconnecting switches are of the “Franklin” design manufactured by the Elec- trical Development & Machine Company. The design and construction of this development were undertaken and largely carried out under the stress of war conditions. The design was in many instances in- fluenced by these conditions, and many possible refine- ments were doubtless omitted owing to lack of time and men to carry them out. In spite of these condi- tions the results have been satisfactory as witnessed by some months of entirely successful operation.