Research On Electrical Parameter Test Technology Of Electromagnetic Relay

Electromagnetic relay is an electronic control device which is widely used in the field of automatic control and communication.Its work will affect the stability and reliability of the system.The test of relay electrical parameters can provide important data which can support for its performance analysis and life prediction.In addition,most of the electromagnetic relay is sealed,once after the completion of the assembly,it is too difficult to reopen the shell of the relay for contact mechanical parameters test.But the time parameters of the relay can qualitatively describe the contact mechanical parameter variations,reflecting contact reliability of the mechanical contact.Therefore,it is of great significance to test the electrical parameters of electromagnetic relay.Around the core of issue,this paper use railway signal relay as the research object.After analysis and comparison of different test schemes,the relay electrical parameters testing system based on industrial computer and data acquisition card PCI-6024 E is designed,and the signal conditioning circuit is used to improve the accuracy and anti-interference ability of the system.By using the virtual instrument development platform LabVIEW,the control of the test system is realized,the high speed collection and preservation of the relay's contact voltage,coil current and coil voltage are accomplished.In the end,according to the dynamic characteristic curve of electromagnetic relay,the parameters of the time were obtained by using the data analysis algorithms in MATLAB,such as the piecewise curve fitting,linear parameter identification and data smoothing processing.