The WKA-15 is a differential (current transformer) component used in industrial earth leakage detection systems, designed for networks where the neutral is directly connected to earth. It operates as part of an insulation monitoring and protection system in combination with RDH, RDHT, and RDHA earth leakage relays. In this configuration, the WKA-15 functions as a measuring transformer that detects residual or leakage currents in the power network and transmits this information to the protection relay for evaluation.
In practical operation, the WKA-15 is used together with RDH-series relays, which trigger a trip signal when the detected leakage current exceeds an adjustable threshold. Depending on the relay type (RDH, RDHT, or RDHA), the system may include latching or self-resetting behavior, as well as adjustable time-delay functions for selective tripping coordination. The WKA-15 transformer itself is typically paired with RDH-type devices that do not include a test function, while WKAT variants are used when test windings are required.
From a system integration perspective, the WKA-15 is part of a safety-oriented leakage protection architecture used in industrial electrical installations. It is installed in conjunction with protection relays mounted in electrical cubicles, where it contributes to fault detection and system isolation in case of ground leakage. The overall system is designed for harsh industrial environments, with the associated relays supporting operation across wide temperature ranges, high humidity conditions, and flexible mounting positions, ensuring reliable operation in electrical distribution and industrial automation networks.
