The on-site application and verification of technical requirements on 1,000 kV live working,such as minimum safety distance,minimum complex gap,minimum effective insulation length of tools,safety protection,shift of potential and etc,were analyzed in the test.

The mission of the electricity-displacement changeover gear with the function of automatic reset is to adopt the step moto to complete the electricity-displacement conversion with the ball bearing leadscrew,while counteracting a spring with two filler rings that makes the automatic reset well.

Treatment of atlantoepistrophic rotation displacement in 28 children by means of traction management;