Study of Short Circuit and Inrush Current Impact on the Current-Limiting Reactor Operation in an Industrial Grid

Varetsky, Yuriy; Gajdzica, Michał

doi:10.3390/en16020811

Cited by 7 publications

(2 citation statements)

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“…To solve this problem, twin reactors [4], magnetization-controlled reactors [5], and transformer-type reactors [6] are applied. However, none of this solves the problem of large weight-size parameters [7].…”

Section: Introductionmentioning

confidence: 99%

The Specifics of PTC Thermistor Applications for Limiting Surge Currents

Safonov,

Frolov,

Zhiligotov

et al. 2024

Energies

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This paper investigates the possibilities of limiting emergency short current pulses by using materials with a positive temperature coefficient. A computational model and method for simulating this process were proposed. Barium titanate was considered a promising material for current-limiting devices due to its low cost, ease of manufacturing and autonomy. The current-limiting properties of a PTC thermistor device were estimated in relation to a significant pulse current overload (10 ms). The value of taking into account the varistor effect when modeling energy dissipation by a PTC thermistor is experimentally demonstrated. The results of the experiment were used in the development of computer models of the current-limiting properties of PTC thermistors. A method for taking into account the varistor effect in the developed models is proposed. It is noted that in order to increase the accuracy of the calculation, it is important to take into account the heat transfer between the PTC thermistor and its contact system. It is also shown that this heat transfer is capable of creating a significant longitudinal temperature gradient inside the PTC thermistor, which creates a high level of thermal stress and leads to mechanical failure. Destruction of this type has been observed during experiments. This research was carried out within the state assignment FSEG-2023-0012.

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Section: Introductionmentioning

confidence: 99%

The Specifics of PTC Thermistor Applications for Limiting Surge Currents

Safonov,

Frolov,

Zhiligotov

et al. 2024

Energies

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“…The 6 kV switchboard supplies the eleven MV induction motors with ratings from 320 kW to 2000 kW. As shown in studies [44], the current-limiting reactor SR2 has to be selected to limit the inrush current amplitudes under the frequent starts of MV induction motors and withstand significant repeated mechanical stresses. The catalogue data of the induction motor of 2000 kW, which drives the feed water pump of the industrial heat and power plant, are presented in Table 5.…”

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confidence: 99%

Power Compatibility of Induction Motors in Industrial Grids Containing Synchronous Generators

Varetsky,

Gajdzica

2024

Energies

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Starting an induction motor causes voltage sag in the industrial grid that may disturb the operation of grid equipment. Direct-on-line starting is the simplest and most cost-effective method for starting induction motors, but also the most problematic. Large industries often use internal power plants with synchronous generators and starting powerful motors may impact the generator operations. The synchronous generators could be operated with the automatic or manual mode of voltage control. As the operation experience proves, the generator voltage control mode has a significant impact on the transient behaviours in the industrial power grid when starting a large induction motor. This article presents a case study of the synchronous generator tripping within a true medium-voltage industrial grid during the direct-on-line starting of a large induction motor driving the feed water pump. An analysis of the generator protection logs after the tripping showed that the synchronous generator was controlled in manual mode and its protection relay settings were exceeded. The transients initiated by induction motor starts were studied for possible configurations and operating conditions of the grid using a model developed on the Matlab/Simulink Software platform. The simulations have shown that concern about starting large motors in industrial grids containing internal synchronous generators needs to be solved considering the grid configurations and the coordination of generator protection and control devices.

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