Development Of Air Circuit Breaker Remote Racking Device

With the growth of social economy,people's living standards improving,the quality of the power supply requirements are also constantly upgrading,more and more sites require uninterrupted power supply.These uninterrupted power supply and distribution systems need to maintain maintenance according to certain maintenance intervals and maintenance frequency,the maintenance of ACB is one of the key steps.When the power distribution system is charged during the ACB maintenance,to remove the ACB will be related to the ACB racking out operation,in this process if the ACB still closed,when driving ACB terminal to leave the distribution network will occur a moment of arcing..At this point the operator in front of ACB,arc fault would produce a fatal injury to the operator.In china there is no standard specifies what security protection.When the maintenance personnel racking out ACB,the operator only worn a simple guards,these guards only protection against electric shock,there is no arc protection.When an arc fault occurs,it will cause very serious consequences.One way to avoid arcing damage is far from the operation of ACB,which requires developing a remote racking devices for ACB.Use of the device,the operator can stand outside the maximum range of the arc damage control ACB racking out and in,to avoid arcing damage to the operator.This paper developed device can be directly attached to the main body of ACB,it's lightweight,compact and easy to operate,and it only take one person to complete all operations.The operator can operation and judgment according to remote racking device control box status indicator,no close action,ensure operator safely.The device uses a unique emergency stop protection method,can reliably control the high voltage electric switch with low voltage.The control box and the switch body with the gap isolation,can effectively ensure the safety of the person.At the same time the device has a set of pre-use method,you can easily determine whether the equipment is normal.Safety is the primary consideration for this device.This paper introduces in detail the development technology of remote racking device:(1)Driving motor and reducer device selection;(2)Design of AC-DC universal power supply circuit,mainly for the buck circuit,to meet AC-DC universal and compact will need to use switching power supply technology;(3)Based on ACB racking out and in characteristics prepare a suitable host and client program;(4)Select the appropriate high-pressure isolation and insulation methods;(5)Prototype development,electrical performance testing and its EMC test,so that in a variety of different conditions are able to work properly.The product developed in this article has been successfully developed and mass production,has been put into the market to achieve good results.