Disclosed is an aging and early failure detection method of a
solid relay. The method comprises the following steps: 1), applying an
excitation signal to the
solid relay, and an A / D sampling circuit acquiring a
voltage drop of a moving connection contact or a
voltage drop of a moving disconnection contact, a
voltage drop of a moving connection-disconnection fault or a
voltage drop of a moving connection-binding fault; 2), an FPGA starting a
timer at the rising edge of the
excitation signal, when load currents flow through the
solid relay, outputting a trigger
signal, and when the trigger
signal is detected, stopping the
timer; 3), the FPGA starting the
timer at the falling edge of a pulse
signal, a
level trigger circuit outputting the trigger signal, and when the FPGA detects the trigger signal, stopping the timer; and 4), storing acquired data in an
external storage circuit, and a display displaying a result. The detection apparatus comprises the FPGA, an excitation output circuit, a load power source, a load case, a contact state indicating lamp circuit, a sampling voltage dividing circuit, the
level trigger circuit, the A / D sampling circuit, an
external data storage circuit, an industrial control computer and a fault alarm. The detection is simple, and the aging detection is rapid, accurate and automatic.