Research Of Load-Ratio Voltage Distribution Transformer For Application Of Solid State Relay

The voltage is one of the important index of weighing electric energy quality. Because the load of the power system is changing all the time every day, the voltage of the power system is changing all the time. Fluctuating to make load be unable to work normally by a large range of voltage, so voltage regulation is one of the mains task of the power system.On-load tap-changer of transformer can work under load, transfer quickly, change one class voltage about 3-6 ms each time; Switch can be operated by hand or electrically-driven and distant place operate while being electronic too, easy to realize automatic management; Transfer and keep relatively heavy range is generally more than 15%; Switch and voltage transformer structure are more complicate than others, make man-hour and material increase, The cost is relatively high.On-load tap-changer is a main device of on-load automatic voltage regulation transformer with. The existing tap-changers are almost contact switches for the machinery type. The switch is not only when switching over with production of electric arc, mechanical contact head easy to be damaged, but also it is slow to regulate, can't frequently operate , so limit the range of application of this kind of switch.The transformer that use solid state relay to realize automated regulation is explored in this issues , it change the winding turn of once side according to the voltage of second side by on-load tap-changer .Thus the purpose to realize automatic steady voltage. The tap-changer is made with solid state relay as its working mechanism and controlled by microprocessor .This switch has totally cancelled the mechanical drive organization, by the microprocessor according to the voltage of second side microprocessor decide the working condition of solid state rely ,high regulation speed , need not transition resistor ,rush current is low .operating frequently ; There is no electric arc to produce, can put in the fuel tank of the voltage transformer directly ; The structure is simple, the fabrication cost is low, benefitand use widely among the voltages transformer of distribution.