With the rapid development of urban rail transit signal technology, signal system has more and more requirementsfor signal infrastructure equipment. Signal basic equipment mainly includes signal generator, track circuit andturnout. Switch machine is an important signal basic equipment used to reliably change the position of turnout,change the direction of turnout, lock the turnout rail, and reflect the position of turnout. It can ensure traffic safety,improve transport efficiency and improve the labor intensity of traffic personnel. For speed-up turnout, it is veryefficient to realize turnout conversion by S700K electric switch machine. When the turnout is squeezed or locatedin the "four-way" position, the sharp rails on both sides are not close to each other. At this moment, it is easy tocause train derailment or rollover, which directly endangers the traffic safety. The maintenance of switch machineis particularly important. Maintenance of switch equipment mainly includes routine maintenance andtroubleshooting. In this paper, a new method for the analysis and treatment of electrical faults of S700K electricswitch machine will be put forward. By applying the new method proposed in this paper, the electrical fault ofS700K electric switch machine can be eliminated in the shortest time. And the turnout can be restored to its normalworking state. The new method is also applicable to the analysis and treatment of electrical faults of ZD6, ZYJ7,ZDJ9 and other types of switch machines.
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