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The modular online condition monitoring system presented was originally developed for three phase gas insulated substations but can be adapted to other types of switchgear. This system is an add-on component for switchgear with single pole and three pole operated circuit breakers suitable for various layouts which are independent of existing control and protection technology. In addition, the modular online condition monitoring system can be retrofitted on existing installations. Depending on customer needs, the modular system provides the functions requested from simple and cost efficient gas monitoring, up to a complete system with partial discharge detection and arc detection. The online condition monitoring system improves the availability of the complete switchgear and supports maintenance planning by calculation of trends and remaining life reserve of the switchgear components. Communication between devices is based on the communication protocol IEC 61850.