A functional auxiliary module for 1st-zone conventional distance relays of double-circuit lines to eliminate high fault resistance-introduced under-reach

<p><em>Environmental concerns along with the increasing demand on electrical power, have led to power generation of renewable sources like wind. Connecting wind turbines in large scale powers with transmission network makes new challenges like the impact of these renewable sources on power system protection. This paper studies the impact of fault resistance and its location on voltage and current fundamental frequencies of faulted lines connected to DFIG based wind farms and it will be demonstrated that because of the large differences between these frequencies, impedance measuring of distance relays is inefficient. Hence in these power systems using conventional impedance measurements is not suitable anymore and new impedance measuring approaches are required in distance relays.</em></p>

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Effect of fault resistance and grid short circuit MVA on impedance seen by distance relays on lines fed from wind turbine generating units (WTGU)

11th IET International Conference on Developments in Power Systems Protection (DPSP 2012) ◽

10.1049/cp.2012.0027 ◽

2012 ◽

Cited By ~ 4

Author(s):

S. Srivastava ◽

U.J. Shenoy ◽

A.C. Biswal ◽

S. Ganesan

Keyword(s):

Wind Turbine ◽

Short Circuit ◽

Fault Resistance ◽

Distance Relays

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Distance Relay Protection Improvement of Alaoji-Afam 330kV Transmission Line

European Journal of Engineering Research and Science ◽

10.24018/ejers.2018.3.9.865 ◽

2018 ◽

Vol 3 (9) ◽

pp. 40

Author(s):

Eseosa Omorogiuwa ◽

Wonodi Ikonwa

Keyword(s):

Transmission Line ◽

Impedance Measurement ◽

Relay Protection ◽

Distance Relay ◽

Fault Resistance ◽

Good Improvement ◽

Distance Relays ◽

Protected Zone

Fault resistance influences the operation of distance relays, thus causing it to give inaccurate impedance measurement, thus resulting to under-reach condition. .Trip report of fault occurrence in Alaoji-Afam 330kV line showed the effect of fault resistance on the relay operation. This paper seek to improve distance relay performance in terms of reliability, speed and selectivity on Alaoji-Afam 330kV transmission line, when fault resistance is present through adjustment of protected zone reach using NEPLAN software to model and simulate distance relay used for this study. Several simulations were run and the results showed good improvement of distance relay operation in handling fault conditions. Adjustment of the protected zone reach was done to compensate for the effect of high fault resistance on distance relay operation.

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