Method for monitoring the electrical energy quality in an electrical energy supply system, power quality field device and power quality system

Abstract

In order to be able to carry out monitoring of the electrical energy quality of an electrical energy supply system using an electrical power quality field device with comparatively little complexity, a method for monitoring the electrical energy quality of an electrical energy supply system is proposed in which the following steps are carried out: - detection of a first measured value of a first power quality characteristic by means of a measuring device (11) of a power quality field device (10, 50) arranged at a measurement point of the electrical energy supply system at a first measurement time; - detection of a second measured value of the first power quality characteristic by means of the measuring device (11) at a second measurement time, which directly follows the first measurement time; - comparison of the first and the second measured value with at least one predetermined threshold value, and - generation of an event signal, which indicates an infringement of the at least one threshold value, precisely when one of the two measured values is above and one of the two measured values is below the at least one threshold value. The invention also relates to a power quality field device in which such a method is carried out as well as to a power quality system.

Description

technical field [0001] The invention relates to a power quality monitoring method in a power supply network, a power quality field device and a power quality system. Background technique [0002] Today's power supply grids are highly complex networks for distributing electrical energy, usually with a large number of energy feed-in and energy consumption. In addition to power supply security, ie ensuring that a sufficient amount of power is provided to each energy user at every moment, the quality of the power provided (hereinafter referred to as "power quality") also plays a key role. The power quality in the power supply network is determined, for example, by means of so-called power quality characteristic parameters such as frequency, voltage and voltage harmonics or current harmonics, distortion factors, flicker, voltage asymmetry and power. Highly sensitive electrical devices currently require electrical energy to be supplied in the form of as pure a sine wave as possib...

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Problems solved by technology

[0004] Since the data storage module built in the power quality field device cannot be chosen to be arbitrarily large for cost reasons, the transmission of the stored measured values ​​to the central analysis computer must be carried out relatively frequently

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