Work on live LV and HV power systems. Mgr. Marek Jelínek ISŠ Sokolnice

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1 Work on live LV and HV power systems Mgr. Marek Jelínek ISŠ Sokolnice Špindler v Mlýn,

2 Training centre Sokolnice Methodology & development Start of activities in 1999 Participation in the development of aids for WoLPS Cooperation on the design of components for power industry Offered trainings WoLPS up to 35 kv IVV up to 35 kv LV and HV cabling technologies Note: WoLPS = Work on Live Power Systems

3 Training and methodology for WoLPS in CZ regions Region North Region West Region Centre Region East Region Moravia Section West Section East 3

4 Number of persons trained for WoLPS Others 4

5 Reasons for implementation of WoLPS Compliance with power supply standards Penalties, motivating quality incentives Increase of power supply reliability Customer satisfaction Economy of equipment maintenance Offer of WoLPS services to important customers Increased safety of employees in their work on power facilities 5

6 Comparison of prices for intervention Sanctions Lost profit Intervention Non-live system WoLPS 6

7 Continuity of operation in CZ The indexes of System Operators indicating the continuity of power transmission or distribution services are as follows: 1. SAIFI (System Average Interruption Frequency Index) Average number of power distribution outages per customer within evaluated period 2. SAIDI (System Average Interruption Duration Index) Average total duration of power distribution outages per customer within evaluated period 3. CAIDI (Customer Average Interruption Duration Index) Average duration of one power distribution outage at a customer within evaluated period It is desirable to reduce the frequency and duration of power outages. The use of WoLPS can improve the indexes of power distribution continuation only in the area of planned work [planned outages]. If all [planned] actions are done using WoLPS, then the system index SAIFI would be improved by approx. 11 % and system index SAIDI by approx. 25 %. (Source: WoLPS HV E-ON, 2010) 7

8 System index SAIDI Minutes per year & customer 8

) Special work (work according to technological procedures, fitter

9 Work on power system on non-live parts close to live parts on live parts Ordinary work (measurement, synchronising, fuse replacement, etc.) Special work (work according to technological procedures, fitter training) Work on disconnected system (under unsecure conditions) 9

10 Renewal of the qualification for WoLPS Renewing period is defined in the standard PNE Each 36 months (with a 1-month tolerance) The qualification is maintained by systematic performance of WoLPS The qualification can be renewed in the training centre of WoLPS Requirements should be sent through PPK 10

11 Methods of WoLPS 11

12 Methods of WoLPS A method for the performance of WoLPS is a technological procedure for the work and protection against dangerous effects of voltage We use the following methods: A. Work on distance B. Work in contact C. Work under potential D. C3M method 12

Work on distance Live part Use HV, VHV and EHV systems Rarely used in LV systems Použití Elektrické za ízení VN, VVN a ZVN. Na za ízení NN se tato metoda používá výjime.

13 Work on distance Live part Use HV, VHV and EHV systems Rarely used in LV systems Použití Elektrické za ízení VN, VVN a ZVN. Na za ízení NN se tato metoda používá výjime. Insulating bar Human body resistance Princip U pracovníka je možnost kontaktu se zemním potenciálem. Proti ú ink m nap tí je pracovník chrán n izola ní ty í a ochranou vzdálenosti. Principle Operators can be in contact with ground potential Operator is protected against voltage effects through insulating bar and protection by distance Ground potential 13

14 Work on distance HV 22 kv 14

15 Work on distance HV 22 kv 15

16 Work on distance VHV 110 kv 16

Work in contact Uncovered live part Insulated LV tools Insulating gloves Human body resistance Insulation against ground Use LV and HV systems Highest maximal

Princip Pracovník je odizolován od zemního potenciálu. Proti ú ink m nap tí je pracovník chrán n izola ními rukavicemi. Pracuje se jen na jednom poteciálu.

17 Work in contact Uncovered live part Insulated LV tools Insulating gloves Human body resistance Insulation against ground Use LV and HV systems Highest maximal applicable voltage for this method is 36 kv AC Použití Elektrické za ízení NN a VN. Nejvyšší možné použitelné maximální nap tí této metody je 36 kv AC. Princip Pracovník je odizolován od zemního potenciálu. Proti ú ink m nap tí je pracovník chrán n izola ními rukavicemi. Pracuje se jen na jednom poteciálu. Principle Operator is insulated against ground potential Operator is protected against voltage effects through insulating gloves Work only on a single potential Ground potential 17

18 Work in contact LV 0,4 kv 18

19 Work in contact HV 22 kv 19

20 Work under potential Uncovered Live part Use HV, VHV and EHV systems This method must not be used in LV systems Použití Elektrické za ízení VN, VVN a ZVN. Na za ízení NN tato metoda nelze aplikovat. Faraday cage Human body resistance Insulation against ground Ground potential Princip Pracovník je dokonale odizolován od zemního potenciálu. Proti ú ink m nap tí je pracovník chrán n prost edky, které fungují na principech Faradayovi kleci. Pracuje se jen na jednom poteciálu. Principle Operator is perfectly insulated against ground potential Operator is protected against voltage effects through aids acting on the principle of Faraday cage 20

21 Work under potential HV 22 kv 21

22 Work under potential EHV 400 kv 22

23 Work under potential EHV 400 kv 23

24 Technologies of WoLPS for HV 24

and USA Combination of methods Greater use of insulating bars 11 teams WoLPS for HV Irish technology Modifikovaná technologie z USA USA

25 Technologies of WoLPS for HV C3M technology Technologie EDF SERECT r.1982 from Pom cky 1982 z Francie i USA Kombinace metod V tší využití izola ních ty í 11 et PPN VN EDF SERECT technology Aids from France and USA Combination of methods Greater use of insulating bars 11 teams WoLPS for HV Irish technology Modifikovaná technologie z USA USA Pom cky z USA Metoda v dotyku Minimální využití izola ních ty í 5 et PPN VN Modified technology from Aids from USA Method in contact Minimum use of insulating bars 5 teams WoLPS for HV 25

26 Teams of WoLPS for HV C3M Irish technology 26

27 C3M HV 22 kv 27

28 C3M HV 22 kv 28

29 Irish technology HV 22 kv 29

30 Irish technology HV 22 kv 30

31 Potentials of WoLPS 31

32 WoLPS LV systems Total 45 work procedures Equipment maintenance Power supply connection work Protection of strangers, insulation of overhead lines Reconstruction of lines Installation of overvoltage protection Repair of cable distribution boxes

33 New trends in LV WoLPS Installation of meters / measuring instruments developed specifically for the installation into live power systems MEg 40/S3 MEg70

34 WoLPS HV systems Flexible disconnecting facilities Connection and disconnection actions (branch, stem; without load, from ring) Checks of section disconnecting switch Replacement of supporting, guy or suspension insulators (single, double) Replacement of brackets Replacement of supporting elements Repair of damaged conductors Installation and repair of bird protection facilities Removal of undesirable objects from lines

35 Thank you for your attention

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