Electrical news and engineering . ng a variety of designs, some operating instantaneous-ly, and others with time element) and reverse current de-vices (also with and without time element devices), but sofar the most satisfactory discriminating device which hasbeen tried on a large scale and found reliable to ojicratewitii certainty when required and to remain inoperativewhen not requirccl, is tin Merz-Irice system nf balanceprotective gcitr. The use of g-raded time limits in series has had an ex-tensive trial as a discriminating system, but unfortunatelythis system has often failed on imjiorta
Electrical news and engineering . ng a variety of designs, some operating instantaneous-ly, and others with time element) and reverse current de-vices (also with and without time element devices), but sofar the most satisfactory discriminating device which hasbeen tried on a large scale and found reliable to ojicratewitii certainty when required and to remain inoperativewhen not requirccl, is tin Merz-Irice system nf balanceprotective gcitr. The use of g-raded time limits in series has had an ex-tensive trial as a discriminating system, but unfortunatelythis system has often failed on imjiortant high tensiontranstiiission network-- 11 has the disadvantages that it THE ELECTRICAL NEWS 93 cannot be used on a ring main, it is opposed to the prin-ciples of instantaneous release, and it is difficult, if notimpossible, to predetermine the correct settings of relaysat various positions on the system in order to isolate withcertainty a faulty section without shutting down any of thehealthy ones, , it lacks
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