Study On Reliability Test Technology And Test Device For Electric Operating Device Of MCCB

Electric operating device, which can close, open and re-trip the moulded case circuitbreaker (MCCB) remotely, is an important external auxiliary of MCCB, and it is used more andmore widely. The reliability of electric operating device has a directly influence on the workingreliability of MCCB, so it is important to study the reliability test technology and its test devicefor electric operating device.The reliability verification test technology and test method for electric operating device ofMCCB is studied referring to some national standards of low-voltage apparatus reliability test.The operation failure rate level is adopted to be the reliability index of electric operating device,and the reliability sampling theory and the reliability verification test plan are analysed. Areliability test device based on IPC is developed. In hardware, the driven circuit and monitoringcircuit based on PCL－818L Data Acquisition Card are designed. The electromagnetic relayscontrolled by SSR switch on and off the signals to close, open and re-trip the electric operatingdevice; the monitoring circuit detects the voltages of the closing and opening terminals of theelectric operating device and the voltage between the contacts of MCCB during the test. Insoftware, the system software based on Visual Basic is developed with modularized design. Theuser interface makes it easy to operate the device; the software can automatically control thereliability test process, save the test result and diagnose the fault itself. The modules of analoginput and test running are mainly analyzed.The paper supports the reliability test for electric operating device in theory and technique.Different specifications of electric operating device can be tested by the test device, whichimproves test efficiency. What’s more, it provides an effective means to improve the reliability ofthis product.