We do seem to be getting more than our share of problems with this turbine. The latest issue is that the turbine’s control mechanism is detecting high voltage spikes in the mains grid. It thinks that this is an alarm situation and shuts itself down. You then have to go into the control panel, tell the turbine that there is nothing wrong, and off it will go again. Mains voltage is supposed to be 230 volts, plus 10%, minus 6%. This is a range of 216 V to 253 V. We are seeing voltages at the turbine well in excess of 253 V, the highest being 294 V. There are two potential causes for this, one is that the grid voltage is high, the other that the length of the cable from turbine to distribution board (approx 450 m) is causing higher resistance which in turn is lifting the voltage. This may all be made worse by the lack of tolerance in the time setting of the G59 relay. Manweb have so far insisted that the delay be set at zero seconds so the briefest voltage spike will trip it out. Manweb have agreed to come and put a data logger on the mains input to see what the incoming voltages are.
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