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One of the main element or function in the GE L90 relay is current differential. Testing of this element might be tricky. This require formula to calculate the pickup current depend on what terminal is used whether terminal 2 or 3. In this page, will be discuss what formula to use in different situation. But first, check the basic requirements of relay testing. Basic Requirement For Relay Testing Requirements: See the requirements page Isolation of the equipment or circuits: Complete the hazard sheet Phone control room and pick up the necessary switching steps. Complete all the issued switching steps as per approve operating order. Do prove-test-prove and apply earths or lock and tag that issued by the controller as per approved operating order. Define permit area that issued by the controller as per approve operating order. Pick up the permit (Work Authority) Complete the sign on/off sheet. Do the isolation for relay testing as per approved ITP (Instruction Test Procedure) Test the re

For relay testing, we might use different equipment with different style and also depend on asset owner requirements. In this page, these are the basic requirement to test the relay in our network that we work witth. Relay test set (i.e. Omicron CMC’s) Omicron CMC test sets like CMC256, CMC356 are very common testing device for the relays installed in the power substations, generation, transmission and etc. Test leads Use to connect the CMC to the relay test plugs Relay settings for reference This is a documentation of the as left relay settings the day the relay been commissioned which to be verified in the relay Laptops, recommended 2 units or more Two or more laptops is better for the relay testing because one laptop will be used in the test set like CMC and the other will be use to communicate the relay. If SCADA checks is required, it’s better to use third laptop to communicate the RTU to check if the relay alarms register through the RTU. Test plugs This will be use to isolate th