Improvement in the continuity of supply due to a large introduction of Petersen coils in HV/MV substations

Ground Fault Temporary Overvoltages in MV Networks: Evaluation and Experimental Tests

“…A well-tuned resonant earthed neutral system is not subject to the previously described phenomena, as shown in [18] [19]; adjustable Petersen coils assisted by neutral analyzer devices [20] have an excellent operational record [11], [14], [15], but maloperation or outage of neutral compensating devices might bring back the undesired TOVs in case of 1LG faults along an MV overhead line [19].…”

Earthing system evaluation and influence on protection performance in resonantly earthed MV networks

“…If the MV network is operated with a resonantly earthed resonant point, supply interruption is greatly reduced, resulting in improved power quality, continuous operation even during the short circuit conditions in the network and a lower potential rise of the earthing systems [1]. Petersen coils' inductance can be continually tuned up and thus give better results regarding the total number of interruptions, however their maintenance during network operation can be more challenging.…”

A novel 4‐limb earth fault compensation reactor for distribution network

“…There are various advantages of using ASC‐based earth fault compensation such as possibility for sustained operation of the network, where energy can be supplied during the fault and during the time when the problem is being fixed. This improves the continuity of supply as perceived by end customers . Similarly, using ASC, arc at fault location can be extinguished and thus the consequential damage can be avoided in the network .…”

“…Probability of extinguishing electric arc in fault location is thereby maximized, and the feeder can remain active and energized. This is to great benefit, as the number and duration of interruptions experienced by customers is reduced considerably …”

“…This is to great benefit, as the number and duration of interruptions experienced by customers is reduced considerably. 2,6 Typical arrangement for earth fault compensation is described in Figure 1. Usually, the main transformer at substation does not have neutral point, as it has a delta connected secondary.…”