Switching transient analysis for low voltage distribution cable

Madichetty, Sreedhar; Swain, Sarat Chandra; Dash, Ritesh

doi:10.1515/eng-2022-0004

Cited by 2 publications

(11 citation statements)

References 34 publications

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“…An important quantity in the identification of defects is the characteristic impedance c Z , determined by the expression [12][13][14]:…”

Section: Relative Methods By Pulsesmentioning

confidence: 99%

“…The impulse propagation speed is chosen depending on the type of insulation as well as the degree of attenuation in frequency of the cable. Calculating the time interval t  from the moment of sending to the moment of its return to the starting point, and given that the pulse moves twice (round-trip) on the cable portion to the fault, then the relative pre-localization distance def L is defined by the expression [13], [16]:…”

Section: Relative Methods By Pulsesmentioning

confidence: 99%

“…The apparatus that uses this method of detecting defects in the cable, is called a TDR(Time Domain Reflectometer) fault locator or reflectometer, made on the principle of reflected impulse [13], [16].…”

Section: Relative Methods By Pulsesmentioning

confidence: 99%

“…In order to identify defects in the electricity cables in operation, a variety of equipment and apparatus are currently used for accurate pre-localization and location, with an increasingly better performance in terms of reducing errors in measuring distances to the fault site [7], [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The identification process begins with the pre-location of the defect, being determined by measuring the distance to the defect site with significant errors both due to the method based on the signal reflection phenomenon and due to the difficulty of physical distance measurement. without prior knowledge of the cable route [7], [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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The importance of the metal reinforcement of low voltage cables in the process of identifying defects

Predus

Muscai

Popescu

et al. 2023

J. Phys.: Conf. Ser.

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Regarding the identification of defect in the electrical energy cables, in exploatation, usual or high-performance methods are used, based in particular on the phenomenon of reflection and refraction of the impulse transmitted in the cable, phenomenon generated by the impedance change at the defect location. In order to identify the defect, an important role is played by the existence of a current path on the cable route between the ends of the electrical cable and the place where the defect occurred. In the case of low voltage cables, there are situations where, following the sleeve process the continuity of the mechanical protection armature of the steel strip or the copper screen has not been restored. To measure the distance to the defect location, location equipment uses low and high voltage pulses which moves to the defect site with a certain speed and which is repeated after a selected time interval. These impulses are transmitted to the location of the defect at one end of the cable, through the circuit generated by the short circuit between the faulted conductor and the metal armature, which is usually found at ground potential. At the same time, there is situations where the defect is difficult to identify precisely because of the continuity of the reinforcement or screen and their connection to ground potential. This paper describes the stages of fault identification in a low-voltage power cable and presents a case study that highlights the importance of the metal reinforcement in the case of the high-voltage impulse method. Ways to detect defects using the arc reflected method (ARM) using the shock wave generator as well as the inductive method are also briefly presented.

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“…An important quantity in the identification of defects is the characteristic impedance c Z , determined by the expression [12][13][14]:…”

Section: Relative Methods By Pulsesmentioning

confidence: 99%

Section: Relative Methods By Pulsesmentioning

confidence: 99%

Section: Relative Methods By Pulsesmentioning

confidence: 99%