Measuring system comprising an intelligent sensor head and having a reduced power consumption for medium-voltage or high-voltage systems or in mining, and method therefor

Abstract

Differently designed measuring systems exist of which most contain a central signal processing unit and a number of electrical measuring components, and in which the measured values furnished by the measuring components are optically transmitted over optical waveguides. The aim of the invention is to provide a measuring system of this type, which has a low power consumption and enables a reliable optical data transmission. To this end, an optical loop is provided between a central measuring unit (MG) and a sensor head (SK). Microprocessors (MP1, MP2), which are situated inside the central measuring unit (MG) and inside the sensor head (SK), carry out transmitting, measuring and monitoring tasks as a distributed controller with bidirectional data communication. A frame synchronization signal serves both for supplying power as well as for deriving a clock signal for block-oriented data transmission. A data communication is carried out for conducting a parameterization and / or programming between the central measuring unit (MG) and the sensor head (SK), and a pre-preprocessing of the measured values is carried out in the sensor head (SK), particularly a measured value correction and / or a range switching and / or a reprogramming of the filtering characteristics and / or an automatic compensation are / is carried out in the sensor head (SK).

Description

technical field [0001] The invention relates primarily to a measuring system for medium-voltage or high-voltage installations or in mines with signal and energy transmission between sensor heads and a central measuring device. The invention also relates to a corresponding measuring method. Background technique [0002] To measure operating voltages in medium-voltage or high-voltage switching equipment, voltage transformers are usually applied. It is necessary to select the insulation and winding transformation ratio according to the working voltage of the switching device, so that the working voltage can be reduced to a display voltage suitable for measurement below 100 volts. Single-pole or double-pole insulated voltage transformers of different construction types are used according to the proposed task (accounting measurement, conductor and installation protection, operational measurement). [0003] Voltage converters always represent a high proportion of the expenditure...

AI Technical Summary

Problems solved by technology

However, it has been found that continuous control of the laser diodes used to power the measuring components over a long distance results in a shortened laser diode lifetime

Moreover, due to electromagnetic effects from high-voltage devices, in particular due to switching processes at high voltages, interference signals can cause disturbances in optical signal transmission through a clockwise shift of the measurement signal (measurement current or measurement voltage)

The optical fiber interface system described in DE 69520371T2 supplies laser source current with its "seemingly stable operation", and its reliability is low

So in fact, there is no fiber optic measurement system that can not only have low power consumption, but also achieve reliable optical data transmission.

Images