A modified charge similarity approach for detecting high impedance earth faults in resonant grounded power distribution networks

Pirmani, Susheel Kumar; Mahmud, M. A.; Islam, Shama Naz; Arif, Mohammad Taufiqul

doi:10.1016/j.epsr.2023.109264

Cited by 4 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that the expected relationship between the three indicators is observed, both in terms of phase angles and magnitudes. Furthermore, the indicators relate to the fault current as predicted by (16). The fault detection response for phase a with settings 𝜖 J =10 mA, T SW =100 ms, K =0.1 and 𝜙=15 • is also shown on the right y-axis, illustrating that the fault detection logic is triggered both when the fault occurs as well as when it disappears.…”

Section: Phase Current Indicatorsmentioning

confidence: 98%

“…The criteria in (19) are visualized in Figure 4, where a fault in phase a is considered. The parameters K and 𝜙 are margins added to allow for some deviation from the ideal vector relationship in (16). A fault is detected when both the vectors J b ∕J a and J c ∕J a come into the shaded area.…”

Section: Logic Implementation and Settingsmentioning

confidence: 99%

“…Figure 12 shows the indicator magnitudes during a 20 kΩ fault, where the magnitude of the fault current and indicators no longer are detectable with the 𝜖 J =10 mA setting. Furthermore, the magnitude of the fluctuations are now more significant compared to the fault current magnitude, distorting the ideal expected relationship between the three vectors as predicted by (16). Lowering the sensitivity threshold 𝜖 J is thus not necessarily going to guarantee detection of very small fault currents, and it also increases the probability of false detections.…”

Section: Phase Current Indicatorsmentioning

confidence: 99%

“…The authors of [14] report that this principle becomes less reliable for very high fault impedances combined with network asymmetry, and [15] further illustrates the problem with asymmetry. In [16], very sensitive detection is achieved based on a charge similarity approach. However, the method assumed and was verified with a perfectly symmetrical network in which no zero‐sequence currents flow in healthy operation.…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE16 Earth fault indicator magnitudes during a field test and laboratory test (right y-axis). R f =20 kΩ in both cases, with pre-fault phase currents approximately 3 A and 20 A in the lab and the real network, respectively.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Implementation and laboratory verification of method utilizing phase and neutral quantities for detection and location of low‐current earth faults in resonant grounded networks

Treider,

Høidalen

2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

Earth faults is a challenging fault type to locate in resonant grounded networks due to their naturally low fault current, and the problem increases with an increased fault impedance. This paper describes the detailed implementation and laboratory testing of a method for detection, location and clearing of earth faults with very small fault currents. The method consists of two indicators used in the fault detection stage, where their simultaneous operation ensures selective fault detection and faulty feeder selection. One of these indicators also enables continuous fault indication throughout a sectionalizing process. The laboratory tests demonstrate that both indicators function as intended, and it is the current sensors which ultimately limit the attainable sensitivity. Faults up to 15 kΩ were detected successfully in the laboratory network based on phase current measurements, while the sectionalizing indicator showed much higher sensitivity and functioned as intended in a 50 kΩ fault. Measurements from one field test in a 22 kV network corroborate the laboratory results and demonstrate the expected earth fault indicator response.

show abstract

Section: Phase Current Indicatorsmentioning

confidence: 98%

Section: Logic Implementation and Settingsmentioning

confidence: 99%

Section: Phase Current Indicatorsmentioning

confidence: 99%