Experimental Research On The Relay Short-circuit Current

With the increasing pollution of the environment, Saving energy and reducing consumption has become the theme of the smart grid, The construction of smart grid cannot be separated from the development of smart meter, Latching-relay is the key component with metering and switching function of smart meter, It should have high reliability and high capacity on short-circuit current, it plays a important role in the protection of smart meter. Relay short-circuit ability directly determines the level of product quality, Research on the short-circuit performance of the product can improve the standard Compliance and the market competitiveness.The paper analyzes the relationship between short-circuit current test and mechanical parameters, such as dynamic pressure, electromagnetic force, spring rebound times, holding force etc. It analyzes the relationship between short-circuit current test and electrical parameters, such as contact resistance,bounce time etc. It analyzes the relationship between short-circuit current test and contact material, contact structure, spring structure, terminal structure. We designed a set of short-circuit current equipment according to IEC62055-31 UC2 standard. the time controls accurately. It can quickly verify the UC2 standard requirements of the 4.5KA carrying, 2.5KA carrying and 2.5KA making performance. The key point of this paper is an experimental study on the influence of different mechanical parameters, different electrical parameters and different structure on short circuit performance.On the one hand, the improving of short- circuit current performance play a important role to help Chinese relay to enter European and American market, On the other hand, it can make the company’s products in the industry competition to maintain technical leadership, The risk of product failure is reduced, and the reliability and stability of the product is improved.