Neutral earthing of three-phase systems, with particular reference to large power stations

Mortlock, J.R.; Dobson, Colin

doi:10.1049/ji-2.1947.0152

Cited by 3 publications

(1 citation statement)

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“…Additionally, Gates [5] analyzed in 1936 the phenomenon caused by open circuits in power systems grounded through neutral earthing transformers and Petersen coils. Many works found in the technical literature deal with the problems caused by the phenomenon of neutral displacement in grounded systems [6][7][8][9][10][11][12]. Thus, several procedures of detection [13,14] and correction [15,16] of the neutral displacement phenomenon were developed over time.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Selected Point of Voltage Reference on the Apparent Power Measurement in Three-Phase Star Systems

León-Martínez¹,

Montañana-Romeu²,

Peñalvo-López³

et al. 2020

Applied Sciences

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The phenomenon responsible for the different apparent powers measured in a subsystem of a three-phase star-configured system, based on the voltage reference point, was identified in this paper using specific components of the instantaneous powers, as a result of applying the conservation of energy principle to the entire system. The effects of the phenomenon were determined using a proposed apparent power component referred to as the neutral-displacement power, whose square is the quadratic difference between the apparent powers of a subsystem, measured using two voltage reference points. The neutral-displacement power is a component of the apparent power, which is determined using the values of the zero-sequence voltages and the line currents in that subsystem. Expressions of the proposed power were derived using the Buchholz apparent power formulations. The validation of the derived expressions was checked in the laboratory and in a real-world electrical network, using a well-known commercial analyzer and a prototype developed by the authors.

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