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| To correct the situation in Fig.1 is quite simply to reduce the voltage to a more realistic level. It would seem that most sites are comfortable to initially settle at around 220V phase to neutral. This is achieved by fitting a fixed ratio step-down transformer (Fig.2) with pre-determined tap settings or adjusting the tap setting on their own incoming transformer, if it is not shared. |
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| However, the tap setting with the latter are quite coarse. This method has been general practice within industry for many years but with the low cost of electricity pre-2000 was not considered high priority. The benefits are an immediate reduction in consumption, increased equipment life, low purchase and installation costs giving 12 to 18 months return on investment. The disadvantages are obvious, there is no control, whatever appears on input a fixed percentage drop will occur on the output including voltage fluctuations and sags. |
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