Intelligent potential transformer (PT) automatic connection and separation switch device

The invention discloses an intelligent potential transformer (PT) automatic connection and separation switch device. Secondary voltages of two sets of PTs are connected to a PT circuit of the device, the transformers converts voltage signals into small signal currents, and the small signal currents are adjusted into digital signals through an analog to digital (AD) sampling circuit and accessed into a digital signal processor (DSP). Section breaker positions, PT switch positions, section isolator positions and other analog input signals are accessed into a direct (alternate) current analog input control circuit to be subjected to voltage-reduction and alternating quantity removal processing and then converted into stable direct current 5V voltage small signals, the direct current 5V voltage small signals are accessed into the DSP, and the DSP carries out breakage with a 1ms timer and detects analog input values continuously. The two sets of PTs are simultaneously connected to a connection and separation operating panel of the device, the DSP carries out integrated judgment according to voltage sampling values and position information of the PTs to control a relay operating circuit on the connection and separation operating panel, and then the connection, separation and switch of the PTs are completed.