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t p u . r u

Operating principle of numerical auto recloser.

28.04.2022

Introduction

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Automatic reclosing (AR) is one of the means of electroautomatics that recloses a disconnected circuit breaker after a certain time to reduce interruptions in power supply in case of unstable damage that created the flow of short circuit currents for fractions or several seconds, after which both the cause and the short circuit eliminated themselves.

Main unstable damage to overhead lines

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Thunderstorm insulation

Whipping wires in the wind

Falling tree branches

Numerical auto recloser

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In utility and industrial power transmission and distribution systems, a numerical relay is a computer system with software protection algorithms for detecting electrical faults. Such relays are also called microprocessor-type protective relays. They are a functional replacement for electromechanical safety relays and can include many protection functions in one unit, including auto-reclosing, as well as measurement, communication and self-test functions.

The block diagram of the device on the microcontroller

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The block diagram of the device on the MС consists of

AS - analog signal sensors. DS - discrete signal sensors MT - measuring transducers. SAS is an analog signal switch. ADC - analog-to-digital converter

MC - microcontroller.

RAM - Random Access Memory ROM - Read Only Memory Address/control databus Interface

Discrete signal receiving device

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Thank you for your attention

Bibliography

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1.Scope of use of digital relays // URL: https://wiki2.org/en/Numerical_relay

2.Сauses of short circuits and overcurrents // URL: http:// electricalschool.info/main/osnovy/280-prichiny-vozniknovenija-i-posledstvija.html

3.The principle of operation of a numerical relay // URL: https:// repositories.lib.utexas.edu/bitstream/handle/2152/21754/LWIN-THESIS-2013.pdf?sequence=1

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