Two steps numerical method for calculating the AC interference from a faulty power line on nearby buried pipelines

Abstract

SUMMARYThe paper presents a numerical method for evaluating induced voltages and currents, at power frequency, on a buried pipeline due to inductive and conductive coupling with a power line in fault condition; both the systems can have generic layouts represented by broken lines. The algorithm consists of a two steps solution of a two wires transmission line model applied at first to the circuit shield wire(s) with earth return and then to the circuit pipeline with earth return. This calculation method is particularly tailored for industrial and real cases applications.

AC interference from a faulty power line on nearby buried pipelines: influence of the surface layer soil

“…According to [10], the pipe-earth circuit which is inductively and conductively coupled with the faulty power line is discretised by a chain of a suitable number of π cells (see Fig. 2) composed by longitudinal elements, i.e.…”

“…In a previous paper [10], we presented a two-step algorithm for the evaluation of the 50-60 Hz induced voltage and current along a pipeline under the influence of a faulty power line; the two steps can be summarised as follows: 1. Study of the faulty power line circuit by means of the transmission line model and determination of the suitable active electrical parameters able to model the electromagnetic coupling of the power line on the pipeline, i.e.…”

“…The algorithm described in [10] is based on the assumption of homogeneous soil, but such a hypothesis can be limitative because in certain cases the influence of the surface layer soil may be very significant in determining some among the quantities characterising the electromagnetic interference on the pipeline (e.g. the touch voltage); for such a reason, we here extend the calculation method to the case of a two-layer soil and we compare some results obtained by applying the two different approaches (i.e.…”

Influence of Steel Non-Linearity in Assessing 50-60 Hz Interference on Pipelines

“…The problem of 50-60 Hz electromagnetic disturbance generated on pipelines by power lines or electrified railway lines is a well-established issue, and vast literature on it exists [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] especially concerning the calculation methods. In spite of that, there is a point that has not been suitably worked out; such a point is taking into account of steel non-linearity when modelling the per unit length (p.u.l.)…”

Electromagnetic interference from power lines on pipelines: influence of pipe insulating coating degradation

“…Since many years, a lot of papers and technical reports have been published on this topic; among them, we can mention [1][2][3][4][5][6][7][8][9][10][11][12]. Moreover, because of the evident similarities between this problem and the analogous one concerning the interference generated on telecommunication cables, we can also add [13,14].…”