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Power systems are subjected to a wide range of small and large disturbances during operation. The power system must adjust to these changing conditions and continue to operate satisfactorily and within the desired bounds of voltage and frequency. The power system should be designed to survive disturbances such as double circuit faults and lost of a large generator. Recently Peninsular Malaysia experienced a major system disturbance in the north resulting in a partial blackout. This paper describes the investigation carried out pertaining to the operation of power swing blocking element in distance relay which is the cause of the major disturbance .On site dynamic testing of the power swing blocking element was performed by using the OMICRON advanced transplay module.