Grounding circuit at switch side of transformer substation and transformer substation

The invention discloses a grounding circuit of a transformer substation switch side and a transformer substation. The circuit comprises at least one first isolation switch, a circuit breaker, at least one second isolation switch, a first grounding switch and a first auxiliary grounding module. The first isolation switch is used for connecting a bus; the circuit breaker and the first isolation switch are connected to a first node; the second isolating switch is connected with the circuit breaker, and the second isolating switch is used for connecting a power supply branch or a load; the first grounding switch is connected to the first node, and the first grounding switch is used for grounding the first node; the first auxiliary grounding module is connected with the first node, and the first auxiliary grounding module is used for connecting the first node with a grounding end when the first grounding switch is abnormal. According to the technical scheme provided by the embodiment of the invention, reliable gro