References
The following is an extract of studies and work carried out since Railectric’s take-off. We shall be pleased to give you more information and further references on request.
We are proud to have supported EZ and Czech Rail with the first 50Hz Static Frequency Converters in mainland Europe. The pilot installations at Otrokovice and Rikovice have transformed the network from 3kVDC to 25kVAC without any modification to the incoming utility infrastructure and are now synchronised to the existing Nedakonice 25kV AC substation, resulting in an optimised feeding configuration for Czech Rail, proving to deliver large cost savings for such a conversion. Railectric have supported EZ primarily in protection and control design of the system as well as commissioning support of the new system. The collaboration between Railectric and EZ ensures an optimised system for Czech Rail.
Implementation of a revised protection concept in the nine 15 kV switching stations of the Lötschberg Base Tunnel (LBT). Calculation of protection settings, download into the protection relays with simultaneous change of the firmware, verification of protection including tripping, alarms (to the SCADA) and remote access.
Participation in the study for the future traction power supply concept for the Zurich node in the phases analysis, concept and synthesis. Detailed analysis using µPAS/ZFS-simulations of all elaborated supply schemes with the timetable concept 2025. The investigations covered voltage quality, conductor and transformer loading, maximum short-circuit currents, voltage differences at section separations as well as feasibility considerations for protection, for both normal and emergency supply configurations.
The assessment covered the overhead lines in the publicly accessible sectors, the concept for traction current return and earthing as well as the automatic earthing system. It has been carried out in accordance with TS 50562 (Process, measures and demonstration of safety for electric traction systems).
RhB’s 66 kV transmission grid has a high percentage of high voltage cables. Network modelling and assessment of resonance stability. Determination of the margins for future undergrounding of 66 kV lines, considering both island operation of the RhB grid and interconnection with the SBB grid (in cooperation with emkamatik GmbH).
Assessment and expert report for the protection concept in view of the system change (AC – DC) station Chiasso which will be modified, and the new DC substation to be built near Chiasso. The protection concept must take account of the case of short circuit between both different supply systems.
Assessment and optimisation of the protection concept at the system switchover AC – DC for the new line Mendrisio (CH) – Varese (I).
Development of the realisation specification for the protection of the electrical separations in the overhead line in the GBT. The project involved the integration of the protective devices – optical scanners – in to the existing control systems with a minimum of adaptations, and also included purchase of the material, as well as support for installation and commissioning.
Execution of overhead line impedance measures using primary test device (Omicron CPC 100) in the main sections of the Gotthard base tunnel (GBT) substation Pollegio – substation Faido – switching station Sedrun – switching station Amsteg – switching station Rynächt. The results we used to verify the modelling of the system, aiming the optimisation of the data quality of the network model. It also allowed SBB to check the plausibility of the protection settings before the first energising of the system, as well as to optimise these parameters and the fault localisation.
µPAS/ZFS-simulations of the whole SOB network including adjacent SBB-lines and the power supply networks of both SOB and SBB. Timetables and rolling stock according to SOB’s timetable concept 2030. Analysis of normal and emergency feeding configurations, identification of weak points. Elaboration of solutions with optimum cost-benefit ratio.
Support of the customer for the implementation, among others with questions of protection, voltage stability and loading of equipment when operating special supply configurations.
The customer is planning a new building to replace the existing Martinsheim in Visp, an old people and nursing home located near the railway station und within influencing reach from various railway power supply plant – traction power 15 kV for SBB and 11 kV for MGB, as well as a 66 kV transmission line for MGB. Derivation of the relevant currents from measurements and simulations, calculation of the magnetic flux densities and assessment of fulfilment of the ordinance.
tl Transports publics de la région lausannoise SA wish to abandon the cable feeders installed on their metro line m1. The study comprised the simulation of the power supply system with the maximum traffic scenario, thermal simulation of the overhead line system and assessment of the thermal load of various elements. The simulations were verified by a section of measurements and eventually demonstrated the feasibility of the simplification strived for by the customer.
Evaluations of various solutions to enhance the traction power supply of the Martigny – Châtelard line (Mont-Blanc Express). The aim is to allow the operation of EMUs in multiple units on the rack railway section Vernayaz – Salvan. µPAS/ZFS simulations to investigate the best solutions including verification with measuring tests.
Expansion an extension of the trolleybus garage Hardau. Development of the protection concept, and as a result, proposals for modifications to the power supply concept. Verification of the dimensioning of apparatus like switches, circuit breakers and cables.
Specification for the primary and secondary systems of the commutable neutral section for Lopper II tunnel. Expert monitoring during planning and execution including integration onto the SCADA system, commissioning and acceptance tests.
