Numerical differential protection algorithm for power transformers

2013 ◽  
Author(s):  
Abdelrahman H. Hamouda ◽  
Fadel Q. Al-Anzi ◽  
Hussein K. Gad ◽  
Adel Gastli
Keyword(s):  
Power Transformers ◽  
Differential Protection

Transformer Differential Protection Using Process Bus According to IEC 61850-9-2 and Non-Conventional Instrument Transformers

2015 ◽  
Vol 799-800 ◽  
pp. 1311-1315
Author(s):  
G. Igarashi ◽  
J.C. Santos
Keyword(s):  
Time Synchronization ◽  
Power Transformers ◽  
Response Analysis ◽  
Differential Protection ◽  
Iec 61850 ◽  
Instrument Transformers ◽  
Synchronization Signal ◽  
Conventional Instrument ◽  
Transformer Differential Protection

Our aim is to show some impacts on the differential protection of power transformers when using Non-Conventional Instrument Transformers associated with the IEC 61850-9-2 process bus. Described herein are a model for simulating the samples in the process bus, a proposed algorithm for differential protection of power transformers adapted from conventional differential relays so that it works according to the IEC 61850-9-2 standard, and a response analysis of the protection algorithm with the loss of the time synchronization signal in the process bus. Suggestions on parameters to be followed for safer operation of the process bus in these circumstances are also offered.

A Setting-Free Differential Protection for Power Transformers Based on Second Central Moment

2019 ◽  
Vol 34 (2) ◽  
pp. 750-759 ◽  
Author(s):  
Hector Esponda ◽  
Ernesto Vazquez ◽  
Manuel A. Andrade ◽  
Brian K. Johnson
Keyword(s):  
Central Moment ◽  
Power Transformers ◽  
Differential Protection

A New Adaptive Differential Protection Scheme for Tap Changing Power Transformer

2015 ◽  
Vol 16 (4) ◽  
pp. 339-348 ◽  
Author(s):  
Ashesh Mukeshbhai Shah ◽  
Bhavesh Bhalja
Keyword(s):  
Power Transformer ◽  
Detection Sensitivity ◽  
Power Transformers ◽  
Test Cases ◽  
Differential Protection ◽  
Protection Scheme ◽  
Differential Characteristic ◽  
Numerous Test ◽  
Internal Faults ◽  
Conventional Scheme

Abstract This paper presents a new adaptive differential protection scheme which efficiently adapts the change in tap position of a power transformer. The proposed scheme is based on analytical derivation of pick-up and slope of the differential relay characteristic. By acquiring information such as rating & connection of CTs and present tap position as input, the proposed scheme enhances sensitivity of differential relay during internal faults. This is accomplished either by decreasing pick-up and/or adjusting slope of the differential characteristic of the relay in case of change in tap position. Numerous test cases consisting of various types of internal and external faults have been simulated for an existing power transformer of Gujarat Energy Transmission Corporation Limited (GETCO), Gujarat, India using PSCAD/EMTDC software package. The proposed scheme increases percentage of winding to be protected during internal faults for power transformers having different ratings and connections compared to the conventional differential protection scheme. Furthermore, it has been observed that the detection sensitivity during special types of turn-to-turn and inter-winding faults with varying fault resistances is also enhanced compared to the conventional scheme. Moreover, it equally maintains stability during CT saturation condition. At the end, comparative evaluation of the proposed scheme with the existing schemes clearly indicates superiority of the proposed adaptive scheme.

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