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Patent Details

Indian Institute of Technology (IIT) Roorkee 
Add-on device and its method to prevent breaker-failure mal-operations 
Bhavesh R. Bhalja and Soumitri Jena 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2019-12-24 
Application Number:
Applied at:
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Indian Institute of Technology (IIT) Roorkee 
The present invention provides an add-on breaker-failure protection device and its method of resetting to prevent mal-operation from subsidence current. The present invention provides economical solution as duplication of circuit breakers (CBs) in substations is not realistic. This invention, after measuring the decaying DC component within a one-cycle moving window, generates a reset signal to the existing breaker-failure function. The method provides clear differentiation between the alternating pattern of fault current and exponential decaying pattern in subsidence current is necessary to prevent the mal-operation of probable breaker-failure functions. The presented invention presents a simpler structure that can be easily integrated to the existing circuit breaker and relay setup. The add-on circuit completely removes the effect of decaying DC component present in the CT secondary current. Hence, it clearly differentiates between the actual fault current and subsidence current in the CT secondary to prevent the mal-operation of breaker-failure function due to subsidence current of longer duration. 

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