Programmed control complete set of equipment realizes the electrical five-prevention interlocking logic through the secondary measurement, control and protection device, and cooperates with primary switchgear such as circuit breakers, disconnectors and grounding switches that can be electrically operated. Through the pre-set programmed operation sequence, the automatic switching operations of working, overhauling and cold standby and other working states are completed, which overcomes the inconvenience caused by traditional manual mechanical operations, and at the same time avoids the occurrence of equipment, line and personal safety accidents caused by possible misoperations.