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Protection system in a power system domain plays a vital role as watchmen to safe guard power system apparatus in the event of faults. The integrity and effectiveness of these watchmen is heavily dependent on the reliability of the components that makes up the system. One of the main components in a protection system is protective relays that provides decision making element for correct protection and fault clearing operations. Failure of the protection devices may reduce the reliability of the power system protection that will impact the overall performance of the power system. Hence it is imperative for power utilities, such as Tenaga Nasional Berhad (TNB) to assess the reliability of protective relays to assure it will perform its intended function without failure. This paper will discuss the application of reliability block diagram (RBD) to assess the reliability and availability of a typical 132kV transmission overhead line protection system using historical failure data of protective relays.

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The successful implementation of Smart Grid depends on the success of the information exchange between devices in the respective systems in a Smart Grid domain. Digital Substation is one of the key systems in Smart Grid domain where information regarding power system network are obtained to execute various functions in a Smart Grid domain. Interoperability, which is the ability of two or more devices to exchange information with each other, is a vital feature for digital substation. To ensure interoperability in a multi-vendor environment for Digital Substation, it is desirable for devices to able to communicate using an open communication standard that is implemented internationally. For power utilities, such as Tenaga Nasional Berhad (TNB), it is imperative to ensure that interoperability between multi-vendor devices is thoroughly tested before the devices are deployed in actual digital substations. This paper will highlight a case study by TNB to verify and validate interoperability between multi-vendor digital substation devices using an open communication standard which is IEC 61850.

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