Three-incoming-line one-buscouple automatic change-over switch electrical interlocking control circuit

The utility model relates to an electrical interlocking control circuit of a three-incoming-line one-buscouple automatic change-over switch. Comprising a first-section bus, a second-section bus, two paths of commercial power transformers connected with the first-section bus and the second-section bus through a Qs1 switch and a Qs2 switch respectively, a standby power supply communicated with the first-section bus or the second-section bus through a Qs3 switch and a bus coupler cabinet connected with the Qs1 switch, the Qs2 switch and the Qs3 switch, and the bus coupler cabinet comprises a controller, an adapter and a Qtie switch. Electrical interlocking is formed among the Qs1 switch, the Qs2 switch, the Qs3 switch and the Qtie switch through adapters, the Qtie adapter is connected with a third-party power supply, and a double-loop looped network electric operation power supply circuit is formed among the Qtie adapter, the Qs1 adapter, the Qs2 adapter and the Qs3 adapter. According to the utility model, stron