An article addressing the importance of NEMES monitoring system and its upgrading appeared in the corporate newspaper issued by ČEZ, a.s – Temelín NPP (No.23/2019). Key HW and SW components for the system have been supplied by TES s.r.o. as mentioned by Mr. Trubka, the head of profession support of electrical group at Temelín NPP.
The system ensures processing of thousands of different signals and monitoring of all important electrical equipment at the power plant. Data provided by the system are considered to be very important for LTO program at Temelín NPP. The „ nonstandard monitoring system“ has been under major up-grading since the beginning of this year. It should be finished by 2025.
The system provides continuous monitoring of voltage and electrical currents parameters of the key electrical equipment. „ Nonstandard monitoring system “(shortly NEMES) watches, for instance, generator, transformer, main circulating pumps or diesel- generators. Provided data are available especially for managers and operating personnel of electrical equipment. The system is not directly involved in the control of the power unit; however its importance increases at the moment when any failure occurs. „It is thanks to the system that the cause of the problem can be detected very quickly”. Such information can reduce tens of hours, in particular, during period of very tight shutdown timetable. The testing of diesel-generators performed a few weeks ago can be mentioned as an example. The system enabled that within half an hour we could identify the cause of unplanned shutdown of the important power source“, explained Mr. Trubka, the head of profession support of electrical group in ČEZ, a.s., Temelín NPP.
In 2019 its 6 year modernisation project was launched. It lies in complete replacement of hardware. The modernization includes replacement of diagnostic units, ensuring processing up to 30 thousand signals, some of which has already been in operation for almost 20 years. The technicians try to schedule works to fit the shutdown plan of the power plant: „The works could also be performed when the equipment is in service, however we could lose the data important to LTO of the power plant. Based on the information on history and current condition of the equipment we can set down conditions of future operation”, Mr. Trubka underlined the significance of the diagnostic system (author of this article is Marek Sviták).
