MKDMKB upgrade review Retrigger box Janusz Rodziewicz Planning

MKD/MKB upgrade review Re-trigger box Janusz Rodziewicz

Planning and Definition Stage Bad and good return of experience from operation, weak points. RTL components: faults analysis, market availability. Surveillance functions improvement. New feature MKB re-trigger. Improvement of system hardware immunity to noises without decreasing the performance. Design Inputs Gathering and Decision Making Process Design Development/ Verification/ Transfer and Production Release of 110 RTB units Development and work with simulation model. Evaluation of the RTL performance under various scenarios Vs. proposed changes. Lacking SPECs for s t u y inp and n a M ges n st a n i h a c g ion a arios t c e t pro ult scen fa new • All units shall be installed during “LBDS - Electronics & Controls of generators rework” in b. 867 01/2019 OR installed in the tunnel end 2019 ? • Maximal propagation time required for the re-triggering signal originating from spontaneously fired generator to the last extreme-position generator. Delay counted from the defined RTB input signal threshold and defined RTB output to the PTM threshold level. Compromise with the immunity to noise. • Minimal length of the pulse at the RTL. • Specification of the output to the PTC for IPOC & SAM. 11/6/2020 MKD/MKB upgrade review Re-trigger box 2

Advancement Measurements in UA 63/67 Gallery: • • Characterisation TSU Trigger Delay pulse attenuation (observed in nominal operation); Measurements on a 300 m line section (MKD-MKB), lossy transmission line; Analysis & Electronic Design: • • • Line output transformers saturation point Vs pulse length characterisation; LAB measurements of voltage surge propagation along the line, description in frequency domain and implementation of the lossy model into the simulation of the electrical circuit; Proposal and evaluation of pulse limiting circuit allowing to protect the line output transformers from saturation; Replacements selection for obsolete components; Mock-up PCB in design; 11/6/2020 MKD/MKB upgrade review Re-trigger box Matlab/ Simulink Simulation 3