MOA on the proper use of distribution transformers

Distribution transformers shall be installed near side of the metal oxide surge arresters (MOA) during normal operation and distribution transformers in parallel, the terminating line, the bottom ground. When the line when an overvoltage occurs, this time with a change would put too three parts dropout voltage generated through the arrester, leads and grounding device, called a residual pressure. In this three-part overvoltage, the arrester residual voltage on its own performance related to its residual voltage value is constant. Residual voltage on the grounding device can be connected to the grounding deflectors distribution transformer housing, then connected to the grounding device and how to eliminate them.
Distribution transformer low-voltage side of distribution transformer should be installed if the low-pressure side is not installed AC and DC High Performance MOV, when the high-pressure side discharge lightning current arrester to the earth when the grounding device to produce a pressure drop, the pressure drop through the distribution transformer housing while in the low-pressure side coil The neutral point. Therefore, the low-pressure side of the lightning current flowing through the windings allow high voltage winding turns ratio induced by a high potential (up to 1000 kV), the potential will thunder and high-voltage side winding voltage is superimposed, resulting in high voltage winding neutral point potential increased insulation breakdown near the neutral point. If the low-pressure side mounted MOA, MOA discharge when the potential of the high-pressure side grounding means is increased to a certain value, the low-pressure side Glass Coating MOV begins to discharge, the low pressure side coil outlet and where the potential difference between the end point and the housing is reduced, so that eliminate or reduce the impact of "anti-conversion" potential.
MOA grounding wire should be connected to the distribution transformer housing MOA grounding wire should be connected directly to the power distribution transformer shell, then shell and then connected to ground. That the arrester ground wire directly connected to the earth, and then another from the ground stake lead a ground wire to the transformer housing approach is wrong
In strict accordance with the regulations require regular maintenance test regularly MOA insulation resistance measurement and leakage current test, if it is found MOA insulation resistance was significantly reduced or breakdown should be replaced immediately to ensure the safety and health of distribution transformer operation.