The "Short-term Compensation Change" to Detect Earth Faults in Compensated Networks

Burkhardt, Erwin; Fickert, Lothar; Jenau, Frank

doi:10.1109/upec49904.2020.9209841

Cited by 1 publication

(2 citation statements)

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“…Assume that the compensation degree k of the network is known. Then, the current ⃗ I p flowing through R p and L p as illustrated in Figure 1 can be computed based on the measured neutral current ⃗ I n and voltage ⃗ V n as shown in (10).…”

Section: Using the Neutral Currentmentioning

confidence: 99%

“…If not integrated with the fault detection, it can then be either passive or active. Active methods can for instance involve injection of a super-imposed signal that can be traced in the network [7,8], or a short-time de-tuning of the arc suppression coil (ASC) [5,9,10]. The drawbacks of such methods are the added complexity and the need for external equipment or integration with the ASC controller.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

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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.

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Section: Using the Neutral Currentmentioning

confidence: 99%