|
|
Application of Sensors and Digitalization Based on IEC 61850 in Medium Voltage Networks and Switchgears
Štefanka, Martin ; Braciník, Peter (oponent) ; Müller,, Zdeněk (oponent) ; Toman, Petr (vedoucí práce)
Medium voltage air insulated switchgear is an important element in energy distribution chain both in industry and utility segments. Switchgear main functions are protection of operational personnel, disconnecting, insulating, switching of energy, measuring of currents and voltages, protection and control of loads and communication of data to control systems. There have been technology evolution in every above mentioned functions during last 40 years. Switchgears today are reliable arc proof constructions with the footprint optimized close to physics limits of dielectric, electromagnetic and thermodynamic fields. Vacuum based technology circuit breakers provides durable and reliable switching functionality and we have seen several technology changes in protection, control and communication. From electromechanical to transistor based relays thru single purpose microprocessor based relays up to today’s multifunctional high performing microprocessor based intelligent electronic devices. Only the area of measurements of currents and voltages have remained in last 40 years unchanged from the basic technology stand point. Still, inductive principal based current and voltage transformers are dominating measuring technology today. Some attempts were made to change measuring technology as such, but no success has been achieved. This thesis is focused to offer a new view on alternative measuring technologies to be used in medium voltage air insulated switchgears and networks both for currents and voltage measurements. Thesis explains why Rogowski coil, resistive and voltage divider are the right choice to be used in medium voltage switchgears. It analyzes in details measurement accuracy constrains of them. Further, thesis explains that deployment of the new measuring technology must be done from the system approach stand point. Sensors connected to intelligent electronic device with communication capability based on IEC 61850 and high speed communication Ethernet bus create a system that simplifies and uniforms switchgear design and allows decoupling of measuring devices engineering aspects from short circuit selectivity study. Thesis also shows example, how this new system can bring changes and simplification to protection and control domain. The result of several years of efforts to define new measuring and digitalization approach in medium voltage switchgear under my leadership are documented in this thesis. This effort lead also to a release of the new product - UniGear Digital concepts from ABB. Final parts of my thesis demonstrates practical deployment of all results documented in this thesis in real application.
|
|
|
Application of Sensors and Digitalization Based on IEC 61850 in Medium Voltage Networks and Switchgears
Štefanka, Martin ; Braciník, Peter (oponent) ; Müller,, Zdeněk (oponent) ; Toman, Petr (vedoucí práce)
Medium voltage air insulated switchgear is an important element in energy distribution chain both in industry and utility segments. Switchgear main functions are protection of operational personnel, disconnecting, insulating, switching of energy, measuring of currents and voltages, protection and control of loads and communication of data to control systems. There have been technology evolution in every above mentioned functions during last 40 years. Switchgears today are reliable arc proof constructions with the footprint optimized close to physics limits of dielectric, electromagnetic and thermodynamic fields. Vacuum based technology circuit breakers provides durable and reliable switching functionality and we have seen several technology changes in protection, control and communication. From electromechanical to transistor based relays thru single purpose microprocessor based relays up to today’s multifunctional high performing microprocessor based intelligent electronic devices. Only the area of measurements of currents and voltages have remained in last 40 years unchanged from the basic technology stand point. Still, inductive principal based current and voltage transformers are dominating measuring technology today. Some attempts were made to change measuring technology as such, but no success has been achieved. This thesis is focused to offer a new view on alternative measuring technologies to be used in medium voltage air insulated switchgears and networks both for currents and voltage measurements. Thesis explains why Rogowski coil, resistive and voltage divider are the right choice to be used in medium voltage switchgears. It analyzes in details measurement accuracy constrains of them. Further, thesis explains that deployment of the new measuring technology must be done from the system approach stand point. Sensors connected to intelligent electronic device with communication capability based on IEC 61850 and high speed communication Ethernet bus create a system that simplifies and uniforms switchgear design and allows decoupling of measuring devices engineering aspects from short circuit selectivity study. Thesis also shows example, how this new system can bring changes and simplification to protection and control domain. The result of several years of efforts to define new measuring and digitalization approach in medium voltage switchgear under my leadership are documented in this thesis. This effort lead also to a release of the new product - UniGear Digital concepts from ABB. Final parts of my thesis demonstrates practical deployment of all results documented in this thesis in real application.
|
host ::
RSS.