LIVE WORKING IN THE CEZ DISTRIBUTION GRID

Transcription

1 LIVE WORKING IN THE CEZ DISTRIBUTION GRID 11 th ICOLIM, Budapest, May 2014 Stanislav Motejzík, ČEZ, a.s., Prague, Czech Republic Václav Žid, Distribuční služby, s.r.o., Hradec Králové, Czech Republic

2 CEZ GROUP IS AN INTERNATIONAL UTILITY WITH A STABLE POSITION IN DOMESTIC AND CEE MARKET CEZ Group in Poland (100% stake in Skawina, 100% in Elcho, 75% in Eco-Wind Construction) Electricity generation, gross [TWh] 2,6 Market share 1,6 % Installed capacity [MW] 681 Market share 1,8 % Total number of employees 382 CEZ Group in the Czech Republic Electricity generation, gross [TWh] 62 Market share 72 % Total number of connecting points (mil.) 3,6 Market share 61 % Installed capacity (MW) Total number of employees CEZ Group in Turkey (50% stake in SEDAS and SEPAS through AkCez, 37,36% in Akenerji) Electricity sales to end customers [TWh] 7,8 Total number of connecting points (mil.) 1,4 Market share 4,5 % Installed capacity [MW] 738 Market share 1,1 % Energy Assets Trading Activities Active Subsidiary CEZ Group in Romania (100% stake in CEZ Distributie, CEZ Vanzare, Tomis Team, M.W Team Invest, Ovidiu Development, TMK Hydroenergy Power) Electricity sales to end customers [TWh] 3,4 Total number of connecting points (mil.) 1,4 Market share 14,8 % Installed capacity [MW] 622 Total number of employees CEZ Group in Bulgaria (67% stake in CEZ Razpredelenie Bulgaria, CEZ Electro Bulgaria and 100% in TPP Varna, 100% Free Energy Project Oreshets, 100% Bara Group) Electricity sales to end customers [TWh] 9,0 Total number of connecting points (mil.) 2,1 Market share 42 % Installed capacity [MW] Market share 7,9 % Total number of employees Source: CEZ Group, national statistics, figures of 2012 and 2013

3 THE CZECH Rozmístění DISTRIBUTION skupin PPN (DSO) vn pokrytí regionu střed INTRODUCTION CEZ DISTRIBUCE DSO, SELECTED FACTS (2013) SUPPLIED AREA [km 2 ] TOTAL CONSUMPTION POINTS TRANSFORMER STATIONS (HV/MV) 238 DISTRIBUTION TRANSFORMER STATIONS (MV/LV) DSO THE GRID HV MV LV TOTAL DISTRIBUTED ENERGY [MWh] OVERHEAD LINES [km] CABLES [km] CEZ DISTRIBUČNÍ SLUŽBY THE SERVICE ORGANIZATION FOR DSO TOTAL EMPLOYEES LW WORKERS LW METHODS 820 TOTAL, 55 MV DISTANCE, POTENTIAL, CONTACT AND C3M 2

4 LIVE WORKING IN THE CEZ DISTRIBUTION SERVICES SEGMENTATION BY VOLTAGE LEVELS LOW VOLTAGE All CEZ Distribution Services company workers are trained in LV LW procedures All third party workers must be certified for LV live working by authorized body Required range: overhead lines, cables, distribution fuse boxes Major activity - installation of insulated tubes on bare conductors, connecting of new consumer from disconnector or fuse distribution box, branches from bare or insulated overhead lines, installation of overvoltage limiters Minor activity branching of cable lines, tensioning of bare conductors, replacement of insulator pulley MEDIUM VOLTAGE Company own workers only Dry cleaning of the distribution transformer station Overhead lines specially selected, educated and trained LW teams 3

5 LIVE WORKING TRAINING LOW VOLTAGE There are three low voltage live working training centers in the Czech Republic. Training polygons are situated in covered halls so that working during all weather conditions is possible. Following the successful passing of the training and tests all participants will get certificate, which is valid for period of three years. MEDIUM VOLTAGE Live working training is performed on the CEZ Distribution own polygon. The training is provided by CEZ Distribution services stuff, LW supervisors skilled workers, specially educated. 4

6 LOW VOLTAGE LIVE WORKING MOST FREQUENTLY APPLIED WORKS 99% Revision and dry cleaning of LV distribution fuse boxes 98% Protection of individuals against intended touching of live parts - installation of insulated tubes on bare conductors 94% Disconnection / connection of customer from disconnection / fuse box 93% Exchange of T-joint piercing connector on aerial selfsupporting cable 90% Screw-up bolts in fuse boxes 90% Installation of conductor line spacers 88% Installation of surge limiters ZnO on overhead lines 86% Installation and connection of LV aerial AES budled cables to bare conductors 82% Exchange of suspension clamp on aerial AES bundled cable 79% Screw-up or exchange of currrent clamps on barline 72% T-joint of aerial bundled AES cable line with AES cable 5

7 EXAMPLES OF LOW VOLTAGE LIVE WORKING Revision and dry cleaning of fuse and disconnection boxes Frequency: period 4 years, total Equipment: insulated tools, rubber gloves Method: contact Isolation of bareline with insulated protecting tubes Frequency: /year (mounting+dismounting) checks 3 months after installation Equipment: insulated protecting tubes, rubber gloves Method: contact 6

8 MEDIUM VOLTAGE LIVE WORKING DRY CLEANING OF THE DISTRIBUTION TRANSFORMER STATIONS IN Moravia North Central East West Performed only in two regions of five by company own workers. According to results of survey performed will be identified substations suitable for dry cleaning in other regions. 7

9 MV LW - DRY CLEANING IN THE DISTRIBUTION TRANSFORMER STATION Dry cleaning of distribution transformer station Cleaning covers: Equipment: Method: busbars, insulators, switching devices, floor, walls, ceiling vaccum cleaner, insulated tube and extensions, rubber gloves contact, distance Dry cleaning of distribution transformer station Cleaning covers: Equipment: Method: distribution transformers, complete cleaning vacuum cleaner, insulated tube and extensions, rubber gloves contact, distance 8

10 MEDIUM VOLTAGE LIVE WORKING DISSEMINATION OF TEAMS Rozmístění skupin PPN vn pokrytí regionu střed Ústí nad Labem Česká Lípa Karlovy Vary Toužim Training Center Plzeň Nový Bydžov Dobruška Klatovy Benešov Hlinsko Olomouc Nošovice There are eleven MV LW teams, each consists of one leader and three workers, supported by one technician in the office. 9

11 MEDIUM VOLTAGE LIVE WORKING DEVELOPMENT OF TASK STRUCTURES New Constructions 10,35% External Customers 0,80% Small Repairs 35,18% New Constructions 10,42% External Customers 2,84% Small Repairs 22,54% LW Tools and Equipment Maintenance 3,88% Damages and Calamities 3,48% Scheduled Maintenance and Diagnostics 62,83% Damages 9,74% Operation 1,12% Scheduled Maintenance and Diagnostics 36,83%

12 MEDIUM VOLTAGE LIVE WORKING VOLUME OF PERFORMED WORKS LW teams also perform combined live/dead working. Example: disconnecting of the branch (live) exchange of switching disconnector (dead) connecting of the branch (live). Total number of dead performance reached 340 cases in

13 MEDIUM VOLTAGE LIVE WORKING BREAKDOWN INTO PROCEDURES Disconnecting, decoupling, reconnecting and connecting of the MV OHL Replacement of support insulator Maintenance of switching line disconnectors and line disconnectors Installation of bird-protection Mounting and dismounting of single-pole disconnectors Repair of switching line disconnectors and line disconnectors 12

14 MV LW WORKS AND PLANNED DISCONNECTIONS IN Moravia North Central East West 910 Volume of MV LW by regions and actions Volume of planned disconnections 13

15 SAIDI AND SAIFI SET BY ERÚ, THE CZECH ENERGY REGULATORY BODY HLNZ Highest level of neutral zone LLNZ Lowest level of neutral zone AQ Achieved quality during assessed period AQmin Limit value of quality performace for bonus AQmax Limit value of quality performace for penalty ΔPVt Financial value following performed quality ΔPVmin Maximum value of bonus ΔPVmax Maximum value of penalty STQ Standard quality level (SAIDI 2013 for CEZ: 262,7 minutes) Dependence between regulated incomes and quality of services with the application of limits and neutral zone: in case of better performing values the CEZ is rewarded. By contrast, in case of failing, the CEZ is penalized. Setting levels of the common standards of grid availability and trends of the future improvement can be a big motivation for exploitation of LW. 14 Source: Final report of the Energy Regulatory Office (ERU) on the methodology of regulation of 3rd regulatory period in the electricity and gas sector

16 HOW CAN MV LW ACTIVITY IMPROVE SAIDI, SAIFI 16% 14% 12% 10% 8% 6% 10,8% 12,7% 13,6% 11,8% 13,2% 4% 2% 4,9% 5,7% 5,5% 4,3% 5,1% 0% SAIDI reducing in % due to LW SAIFI reducing in % due to LW 15

17 AUTHORS ING. STANISLAV MOTEJZÍK ING. VÁCLAV ŽID Senior Specialist Live Working Specialist ČEZ, a.s. ČEZ Distribuční služby, s.r.o Duhová 2/1444 Riegrovo nám. 1493/ Praha Hradec Králové Czech Republic Czech Republic [email protected] Secretary of LW Section, ČSZE Member of LWA SC [email protected] Deputy Secretary of LW Section, ČSZE Member of LWA TC ČSZE is the Czech Association of Energy Sector Employers LWA is the Live Working Association 16