Journal ArticleDOI
Performance of Third Harmonic Ground Fault Protection Schemes for Generator Stator Windings
TLDR
In this paper, the authors show how the normally generated third-harmonic voltage can be used to protect the lower ten to twenty percent of generator stator windings against ground faults, and a method of determining the applicability of the scheme to a given machine is described which takes into account the design of the generator and its externally connected apparatus.Abstract:
The paper shows how the normally generated third-harmonic voltage can be used to protect the lower ten to twenty percent of generator stator windings against ground faults. A method of determining the applicability of the scheme to a given machine is described which takes into account the design of the generator and its externally connected apparatus. The effects of finite resistence ground faults are also investigated and other advantages of the scheme, such as protection of the neutral, are also highlighted.read more
Citations
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Journal ArticleDOI
Condition Monitoring of Brushless Three-Phase Synchronous Generators With Stator Winding or Rotor Circuit Deterioration
TL;DR: In this article, the authors present experimental and theoretical analyses used to establish electrical features that can be utilized as indicators of armature winding, field winding or rectifier diode deterioration in brushless three-phase synchronous generators before the imperfection progresses to become a ground fault.
Journal ArticleDOI
Adaptive ground fault protection schemes for turbogenerator based on third harmonic voltages
TL;DR: In this paper, two adaptive stator ground fault protection schemes based on digital techniques are developed, which can automatically track the change of generator operating conditions before a ground fault occurs, compared to conventional third-harmonic voltage schemes.
Journal ArticleDOI
Design Principles of a New Generator Stator Ground Relay for 100% Coverage of the Stator Winding
TL;DR: In this paper, a relay for detecting ground on the stator windings of generators is proposed, which provides 100% coverage of the windings with measurement of the fundamental and third harmonic components of the residual voltage at the terminals of the generator and the voltage across the grounding resistor at the neutral of a generator.
Journal ArticleDOI
Differential Protection Based on Zero-Sequence Voltages for Generator Stator Ground Fault
Tai Nengling,J. Stenzel +1 more
TL;DR: In this article, a new differential protection scheme based on zero-sequence voltages with 100% coverage for generator stator ground faults is proposed, which exploits the fault information of both the zero sequence fundamental voltage and the third-harmonic voltage.
Journal ArticleDOI
Modeling and Experimental Verification of a 100% Stator Ground Fault Protection Based on Adaptive Third-Harmonic Differential Voltage Scheme for Synchronous Generators
TL;DR: In this paper, an adaptive stator-ground fault protection scheme based on third-harmonic differential voltages is implemented on a lab scale synchronous generator, which is used to emulate the fault characteristics of industrial generators along the stator windings.
References
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Journal ArticleDOI
Stator earth-leakage protection for large generators
TL;DR: In this article, a generator protection is described which is capable of detecting earth leak, ages in any point of the stator winding and deterioration of insulation over parts of the winding adjacent to the neutral point.