[Electric engineering.] . l be seen that the two secondary coils arehere connected in series so that the E. M. generatedin them act together to set up a current through the coils, §14 ELECTRIC TRANSMISSION. 61 thus resulting in a short circuit. In connecting up the sec-ondaries, before making the final connections and beforeconnecting on the circuit, it is always well to make surethat the proper secondary terminals are being connectedtogether. This can befound out by connect-ing two of them to-gether and then con-necting the other twothrough a piece of small Plfuse wire or fine copperwire.
[Electric engineering.] . l be seen that the two secondary coils arehere connected in series so that the E. M. generatedin them act together to set up a current through the coils, §14 ELECTRIC TRANSMISSION. 61 thus resulting in a short circuit. In connecting up the sec-ondaries, before making the final connections and beforeconnecting on the circuit, it is always well to make surethat the proper secondary terminals are being connectedtogether. This can befound out by connect-ing two of them to-gether and then con-necting the other twothrough a piece of small Plfuse wire or fine copperwire. If the fuse blowsit shows that the connections should be re-versed. It is often moreconvenient to reversethe primary terminals FlG- 23- than the secondary, especially if the latter have beenjoined up permanently. Reversing the primary has, ofcourse, the same effect as reversing the secondary, and itis usually easier to carry out, because the primary connec-tions are light and easy to handle compared with the /OO Vr- 15. Generally speaking, it is not advisable to operateseveral transformers in parallel, or banked, as it is some-times termed. This is especially true if the transformers aresmall and scattered, as on many lighting systems, althoughit was commonly done some years ago, when transformerswere not made in large sizes and where it was necessary tohave a large transformer capacity. Suppose a number oftransformers are operating in parallel, as shown in Fig. they do not all have the same voltage regulation, the loadmay divide unequally between them and one or more ofthem take more than its share. The result is that the fusesof the heavily loaded transformer blow, and this throws aheavier load on the remaining transformers. Cases havebeen known where the fuses would bloAV one after the other 62 ELECTRIC TRANSMISSION. §14 after they were once started by one transformer takingmore than its share of the load. Of course, if the trans-formers are all of the
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