Transmission device of 252kVGIS (gas insulated switchgear) isolating or grounding switch

The utility model discloses a transmission device of a 252kV GIS (gas insulated switchgear) isolating or grounding switch. The device comprises a gear box, an intermediate phase gear box, an edge phase gear box, a transmission main rod, a transmission compensating rod, a gear and couplings. The device is characterized in that the gear is arranged in a closed shell; the intermediate phase gear box and the edge phase gear box are connected through the transmission main rod and the transmission compensating rod; and the couplings are arranged between the intermediate phase gear box and the transmission compensating rod and between the edge phase gear box and the transmission compensating rod. The device has the advantages of enhanced rust resistance, stable and reliable transmission, stable operation and compact structure, and is convenient to install and debug.