Why multi-restrained differential is the most versatile method for general application using convectional current transformers

Why multi-restrained differential is the most versatile method for general application using convectional current transformers

Air-core transformer differential schemes have been impractical to study due to its complexity in the manufacture, the bulkiness in size and the high leakage inductance resulting in very poor regulation and thus unsuitable in power distribution (Mozina, 2000). As a result, they provide high power even at low power frequencies in high current windings. As stated in (Apostolov, Rick, Benton & Dupuis, 1999) in terms of costs, air-core transformer scheme are expensive as compared to the multi-restrained schemes. Multi- restrained differential schemes are quite reliable due to tits selectivity, better impedance fault protection and high current transfer for longer transmissions (Rothe & Concordia, 1947). Moreover, the use of multi-resolution signal decomposition in fault protection has increased the device security as compared to the other schemes Consequently, multi-restrained differential scheme has a high speed which is provided by the windings which minimize stray capacitance and leakage inductance thereby improving high-frequency response. The presence of fault current contribution in feeders should be separately restrained because high internal-fault currents will cause sufficient restraint to prevent power tripping (Smith, Sonnemann &. DoIDs, 1939

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