Enhanced Back Controlled Phase Fault and Earth Fault Busbar Protection Scheme using Overcurrent and Earth Fault Relays

2021 ◽  
Author(s):  
D. Obuliraj ◽  
P. Loganathan
Keyword(s):  
Protection Scheme ◽  
Earth Fault

Performance of restricted earth fault protection scheme in the presence of current transformer remanence

2008 ◽  
Author(s):  
Kamarul Jalal Abdul Jalil ◽  
Ab Halim Abu Bakar ◽  
Wan Norliza Wan Mahadi ◽  
Faridah Hani ◽  
Mohamed Salleh
Keyword(s):  
Current Transformer ◽  
Protection Scheme ◽  
Earth Fault ◽  
Fault Protection

scholarly journals Transformer Differential Protection

2020 ◽  
Vol 5 (8) ◽  
pp. 891-898
Author(s):  
Aniagboso John Onah ◽  
Edwin Ejiofor Ezema
Keyword(s):  
Operating Conditions ◽  
Protective Equipment ◽  
Differential Protection ◽  
Power Networks ◽  
Protection Scheme ◽  
Earth Fault ◽  
Directional Detection ◽  
The Difference ◽  
Fault Clearance ◽  
Transformer Differential Protection

Overcurrent and earth fault protective equipment employing time grading and directional detection cannot provide correct discrimination on all power networks and in many cases clearing times for some faults would not be acceptable. Differential protection is an alternative overcurrent protective scheme, which is used to protect individual sections of networks or pieces of equipment, such as transformers, generators, e.t.c. Thus, where protection co-ordination is difficult using time delayed over current and earth fault protection, or where fast fault clearance is critical, then differential protection may be used. Kirchhoff’s first law, which states that the sum of the currents flowing to a node must be equal to the sum of the currents flowing out from it is the basic principle of the differential protection scheme. It detects the difference between the current entering a section and that leaving it. Under normal operating conditions, the current leaving the protected unit would be equal to that entering it at every instant. If the current flowing into the protected unit is the same as the current leaving, then the fault is not in the protected unit and the protective equipment or relay should not operate. If there is a difference in either the phase or magnitude between input and output, then the fault is in the protected unit and the protection should operate. This paper investigates how power transformers can be protected using the current-differential protection schemes.

Novel Protection Scheme of Single-Phase Earth Fault for Radial Distribution Systems With Distributed Generators

2018 ◽  
Vol 33 (2) ◽  
pp. 541-548 ◽  
Author(s):  
Yuanyuan Wang ◽  
Gen Wei ◽  
Hongming Yang ◽  
Haowei Chen ◽  
Zi Ouyang
Keyword(s):  
Radial Distribution ◽  
Distribution Systems ◽  
Single Phase ◽  
Protection Scheme ◽  
Earth Fault ◽  
Distributed Generators

Investigation of Earth Fault Characteristics Under Different Neutral Grounding Methods

2015 ◽  
Vol 8 (3) ◽  
pp. 323
Author(s):  
Abdallah R. Al-Zyoud ◽  
Abdullah Alwadie ◽  
Akram Elmitwally ◽  
Abdallah Basheer
Keyword(s):  
Earth Fault

Advance Protection for Three Phase Induction Motor using Microcontroller Atmega32

2018 ◽  
Vol 8 (1) ◽  
pp. 172
Author(s):  
Karan S Belsare ◽  
Gajanan D Patil
Keyword(s):  
Induction Motor ◽  
Low Cost ◽  
Short Circuit ◽  
Cost Factor ◽  
Protection Scheme ◽  
Three Phase ◽  
The Cost

A low cost and reliable protection scheme has been designed for a three phase induction motor against unbalance voltages, under voltage, over voltage, short circuit and overheating protection. Taking the cost factor into consideration the design has been proposed using microcontroller Atmega32, MOSFETs, relays, small CTs and PTs. However the sensitivity of the protection scheme has been not compromised. The design has been tested online in the laboratory for small motors and the same can be implemented for larger motors by replacing the i-v converters and relays of suitable ratings.

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