Abstract: A transformer fault analyzer provides on site fault analysis of electrical distribution transformers, relying on patterns of parameter variation in transformer winding ratios, winding resistance and magnetizing impedance, and comparison of these parameters to predetermined values. In a preferred embodiment the analysis considers transformer ratio balance and magnetizing impedance balance. The transformer analyzer may be used with the transformer under load or no load conditions, and thus can be used to test transformers in the field as well as surplus or refurbished transformers.

Abstract: A bag-making machine which comprises a rotatable roller and feed means for feeding a continuous plastic web onto the roller at the rate of rotation of the roller. The machine has a cutter sealing member disposed transverse to the feed direction of the web, and a link lever system for reciprocating the cutter sealing member during working and return strokes thereof, to displace the cutter sealing member both arcuately and radially relative to the roller. The machine includes cam tracks at opposite ends of the roller and displacing means therefor synchronised with the link lever system, the cutter sealing member having cam followers co-operating with the cam tracks.An inline bag-making installation including the bagmaking machine, draw rollers upstream of the machine, a printer upstream of the draw rollers, and drive means interconnecting the roller of the bag-making machine and rollers of the printer for synchronous operation.

Abstract: A bag-making machine including a longitudinally slotted roller and feed means for feeding plastic film onto the roller. A synchronised cutter sealing member is displaceable cyclically to cause it to enter a slot of the roller to cut and seal the film. Mating formations on the cutter sealing member and roller are engageable at the start of each cycle and moveable arcuately in unison before disengaging. This engagement ensures accurate registration of the cutter sealing member with a slot during simultaneous arcuate movement thereof.An inline bag-making installation including the bag-making machine.A bag-making method which includes feeding plastic film over a longitudinally slotted roller and moving a synchronised cutter sealing member cyclically to engage the roller cyclically in registration with a slot thereon, and to move arcuately in unison therewith while sealing and cutting the film.