Evaluation of Restricted Earth-Fault Transformer Differential Protection Schemes Through an Experimental Test Bench

Document Type

Conference Proceeding

Publication Date



Department of Electrical and Computer Engineering


This paper presents an experimental test bench for generating events and faults in a three-phase transformer assembled in a laboratory for the purpose of validating performance of two restricted earth-fault (REF) differential protection algorithms: a conventional method, based on phasors; and a high-frequency-components-based algorithm, which uses the wavelet transform. The high-frequency-based method performed well, detecting all faults rapidly, whereas the phasor-based method failed to detect the fault during a transformer energization event, besides to presenting greater delays than wavelet-based one. The results indicate the feasibility of the experimental test bench in generate representative cases to the validation of existing restricted earth-fault transformer differential protection schemes.

Publication Title

2023 Workshop on Communication Networks and Power Systems, WCNPS 2023