Reconstruction of medium voltage transformer station 35/10 kV Dugi Otok
KONČAR Electronics and Informatics Inc. completed reconstruction of medium voltage transformer station for Croatian DSO (Distribution System Operator). It is TS 35/10 kV Dugi Otok, located on central part of Dugi Otok island.
Due the increase of station capacity and expanding with additional 4MVA transformer, new bays are added and equipped with protection and control terminals (relays). In addition all other protection devices are upgraded and changed.
All new devices are KONČAR protection relays of KONPRO series: RFX633 and RFD633. KONČAR Electronics and Informatics Inc. also provided new AC power supply system. Communication between relays is done using IEC 61850 protocol.
After installation, all equipment is successfully tested together with remote control from DSO dispatching centre in Zadar.
Reconstruction of auxiliary power supply system in SS Konjsko
KONČAR – Electronics and Informatics Inc. has contracted with the company Croatian Transmission System Operator Ltd. Split the reconstruction of the auxiliary DC power supply system 220 V at substation 400/220/110/10 kV Konjsko. The contract encompasses the production of equipment, factory testing, and installation in the object, cable laying, on-site testing, commissioning and delivery of the final design documentation.
SS Konjsko was built in 1983 and represents the largest power facility of transmission network in Dalmatia that enables the electricity transmission from Hydro power plants Zakučac, Orlovac, Ðale and reversible hydro power plant Velebit to SS Mostar and Bilice and Switchyard Brinje. Over the last 35 years, the substation has undergone a number of changes of primary and secondary equipment that have greatly influenced the DC voltage supply system. Additionally, the existing systems are outdated today, therefore, the only possible solution were comprehensive redesign and reconstruction.
As the substation is extremely important for the Croatian transmission system, all installed auxiliary DC power supply systems must have the highest level of reliability because they provide supply for all vital equipment.
The needed high level of reliability and availability of power supply is achieved through an appropriate power supply concept. A double power supply system with modular thyristor rectifiers that operate in redundant parallel connection according to the principle n + 1, is foreseen. Each system has its own battery and main distribution board. Sub distributions are deployed in relay houses and each will be powered double-sidedly, independently from both DC sources.
The final factory system testing was carried out in the presence of purchaser’s representatives on end of February 2018, and the equipment delivery and works on the facility are planned for the April.
2018-04-16T10:48:58+00:00 April 16th, 2018|
Reconstruction of the DC power supply system in SS 110/35 kV Blato
Last month, KONČAR – Electronics and Informatics has successfully completed the final factory acceptance test of the DC power supply system for HOPS – Split (Croatian TSO, subsidiary Split), SS 110/35 kV Blato.
The contract includes reconstruction of the main 220 V power supply system and two 48 V systems designated to supply telecommunication devices, local and remote signalization.
Reconstruction was designed in a way that three separate systems have to be replaced by only ones having three different voltage outputs. It means that for 48 V is not foreseen any additional rectifiers or batteries. The reliable power source will be only 220 V bus bars, while 48 V voltages will be obtain using redundant DC/DC converters.
The 220 V power supply system is the standard type for HV transmission transformer stations: KONIS-B 220 V, 40 A. And it will supply electric drives of the HV and MV breakers, control, protection, signalization and the emergency lighting.
Equipment manufacturing, factory acceptance test, installation on the site, cable laying, testing on the site, selectivity testing between circuit breakers, commissioning and issuing of as built documentation are included in the scope of contract.
Delivery of equipment and site works are scheduled to be performed in April.
2018-03-15T12:48:20+00:00 March 15th, 2018|