Relay coordination refers to the systematic arrangement and timing of protective relay devices to ensure that, during a fault or abnormal condition, only the nearest protective device operates to isolate the affected section. This selective tripping prevents unnecessary outages and. Selective short-circuit protection can be achieved in different ways, such as: Time-graded protection Time- and current-graded protection A straightforward way of obtaining selective protection is to use time grading. The principle is to grade the operating times of the relays in such a way that. IEEE/IAS/I&CPSD Protection & Coordination WG Chair Jacobs Canada, Calgary, AB rasheek. com IEEE Southern Alberta Section PES/IAS Joint Chapter Technical Seminar - November 2016 Protective Relays - Technical Seminar Nov 2016 - Copyright: IEEE 2 Abstract: Protective relays and devices. Basler Electric is a manufacturer of excitation systems, voltage regulators, genset controls, protective relays, custom transformers, and injection molded plastic components. Basler also offers turnkey engineering services through their Basler Services, LLC subsidiary. Co-ordination also includes protective device characteristics such as fuse, MCB‟s, circuit breakers as applicable. One-line diagrams and detailed network data (lines, transformers, buses).