The10KV Column Load Switch Device Field Application Research

With the development of society and economy people put forwardhigher and higher requirements on reliability of power supply.10kVdistribution line which at the end of power grid is directly connect withusers,it is the key of power grid reliability control. The column loadswitch device has a current breaking capacity,can improve flexibility ofthe distribution network operation,reduce power failure influence causedby fault and overhaul. But a variety of equipment combination anddifferent device types make operation and maintenance inconvenience.How to choose the right equipment, reasonable design of the device thenmakes the load switch performance to the fullest play has become atheme which line worker concerns.Based on more than20years of operating experience,technical staffimprove performance of the load switch and the lighting arrester withhelp of equipment factory,and then design a new type of column loadswitch device combined with the operation and maintenance requirements.The characteristic of new device is that, load switch and lighting arrestersare installed separately,one can be replaced alone when it is damaged, load switch is installed at the bottom of the device, can be installedoperated or replaced conveniently.Through analysis and test technicalstaff certificate that new column load switch device is in normaloperation when lightning induced voltage occurs,the device meet therequirements of lightning protection. Through analysis and calculate on10kV distribution circuit of three-phase short-circuit condition, technicalstaff find that switch is arranged at the bottom of the column load switchdevice can break short circuit current, cut off the fault part,won t bedestroyed in the worst case. Load switch rated current meet closing andopening loop current requirements,can be used on load adjustment indistribution circuit hot line.Switch is arranged at the bottom of the column load switch devicemeet10kV distribution circuit operation requirements in Shanghai,hasprominent superiority on equipment maintenance.Compared with otherdevices, technical staff find that new device have more advantages onlabor efficiency, factor of safety in hot line work. Simple operation,lessresources occupying make failure equipment can be exchange at the firsttime. Switch is arranged at the bottom of the column load switch deviceunify different types of device,make load switch perform best in gridstructure,and lays a foundation for10kV distribution circuit s security,reliable operation.