GE Vernova MMLG/MMLB Test Blocks and Test Plugs

In the power system, the reliable operation of protective devices (such as relays) is the cornerstone of ensuring the safety and stability of the power grid. Regular secondary injection testing is an essential maintenance step to verify the performance of these protective devices. However, traditional testing methods often require temporary disassembly of wiring, which is not only time-consuming and laborious, but also poses safety hazards such as accidental contact with live equipment and high voltage caused by open circuits in the secondary circuit of current transformers (CTs). The MMLG series test blocks and MMLB multi finger test plugs launched by GE Vernova, as important members of the Midos product family, are specialized testing accessories designed to address these pain points. They provide standardized monitoring and testing interfaces for various power system protection schemes, greatly simplifying the operation process and significantly improving the safety of the testing process.