SPEN, Rasmus Larsson, High Voltage Breakers Innovative breaker solutions Substation design

Transcription

1 SPEN, Rasmus Larsson, High Voltage Breakers Innovative breaker solutions Substation design

2 Innovative breaker solutions High performance substations ABB FOCS Ludvika High Performance DCB HVDC Applications SF6 free breakers FACTS Applications May 22, 2014 Slide 2

3 Innovative breaker solutions Common denominators

4 Common denominators Maintenance and failure rates DCB FOCS 1960 Today Perfection is not when there is nothing left to add, it s when there s nothing left to remove ABB Group May 22, 2014 Slide 4

5 Common denominators Evolution of high voltage circuit breakers ABB Group May 22, 2014 Slide 6

6 Common denominators Evolution of high voltage disconnectors ABB Group May 22, 2014 Slide 7

7 Innovative breaker solutions Historical develpment

8 Historical background of S/S development A 1. Breaker connected directly to busbar, busbar out of service during CB maintenance

9 Historical background of S/S development A 1. Breaker connected directly to busbar, busbar out of service during CB maintenance 2. Disconnector (DS) invented, own bay out of service for CB maintenance busbar out of service during DS maintenance

10 Historical background of S/S development B A 1. Breaker connected directly to busbar, busbar out of service during CB maintenance 2. Disconnector (DS) invented, own bay out of service for CB maintenance busbar out of service during DS maintenance 3. Second busbar introduced, own bay out of service for CB maintenance own bay out of service during DS maintenance

11 Historical background of S/S development C B A 1. Breaker connected directly to busbar, busbar out of service during CB maintenance 2. Disconnector (DS) invented, own bay out of service for CB maintenance busbar out of service during DS maintenance 3. Second busbar introduced, own bay out of service for CB maintenance own bay out of service during DS maintenance 4. Auxiliary busbar introduced, own bay in service for CB maintenance only own object out of service during DS maintenance

12 Historical background of S/S development Trad. solutions focused on maintenance A Single busbar A B Double busbar C A B Double + Transfer busbar These SLD are focused on CB maintenance Separate DS function to isolate CB Sensitive to primary failures. One primary failure can take out whole substation Failure of the buscoupler breaker Busbar failure with following breaker failure of bus-coupler breaker

13 Historical background of S/S development Trad. solutions focused on failure & maintenance A 1 ½-breaker A Double breaker B B CB maintenance without outage on any outgoing bay Busbar fault without outage on any outgoing bay Worst scenario for a primary fault One primary fault + circuit breaker failure, will only cause outage of one (1 1/2-br) or none (2-br) additional outgoing bay

14 Historical background of S/S development Availability impact of open air disconnectors High performance Failure focused configurations Double breaker For exceptional failure tolerance, performance and easy extension Breaker-and-a-half For exceptional failure tolerance and performance Ring bus Exceptional failure tolerance and performance for small substations Medium-Low performance Maintenance focused configurations Single busbar For maintenance of circuit breakers Double busbar For maintenance of disconnectors Bypass/Transfer busbar For maintenance of circuit breakers & disconnectors ABB Group May 22, 2014 Slide 15

15 Innovative breaker solutions Disconnecting Circuit Breaker Basic unit requirements

16 What is the DCB? Disconnecting Circuit Breaker The disconnecting function is integrated in the breaking chamber. This eliminates the need for separate disconnectors. The Disconnecting Circuit Breaker (DCB) was introduced by ABB in ABB Group May 22, 2014 Slide 17

17 What is the DCB? The breaking function In the DCB, the breaking function: Is identical to the conventional circuit breaker Utilizes the same breaking chamber and operating mechanism as a conventional circuit breaker DCB LTB 145 Same high reliability as for a standard circuit breaker ABB Group May 22, 2014 Slide 18

18 What is the DCB? The disconnecting function The disconnection function for a DCB is obtained between the open circuit breaker contact set. Dielectric withstand of a disconnector DCB LTB 145 What we don t have can not fail nor require maintenance ABB Group May 22, 2014 Slide 19

19 What is the DCB? Locking of DCB Point of isolation Unlocked DCB isolation point immobilised DCB open - Unlocked isolation point immobilised and locked ABB Group May 22, 2014 Slide 20

20 Disconnecting Circuit Breaker Maximum security with motor operated earth switch Motor operated earthing switch closed from control room Visible earthing switch for maximum safety and padlocked ABB Group May 22, 2014 Slide 21

21 Disconnecting Circuit Breaker DCB portfolio Type DCB LTB 72.5 DCB LTB 145 DCB HPL DCB HPL DCB HPL 550 DCB LTB 72.5 with CT DCB LTB 145 with CT Rated voltage 72.5 kv 145 kv kv kv 550 kv 72.5 kv 145 kv Rated current 3150 A 3150 A 4000 A 4000 A 4000 A Circuit breaking current 40 ka 40 ka 50 ka 63 ka 63 ka 40 ka 40 ka May 22, 2014 Slide 22

22 IEC Standard for Disconnecting Circuit Breakers IEC DCB fulfills requirements for a circuit breaker and a disconnector The standard describes how to test, interlock and block a Disconnecting Circuit Breaker ABB Group May 22, 2014 Slide 23

23 Innovative breaker solutions Substation design

24 Substation design Section clearance Single busbar Double breaker Disconnecting links are used to minimize the outage of busbars and lines 1½ Breaker ABB Group May 22, 2014 Slide 30

25 Substation design Primary grounding switches Single busbar Double breaker Primary ground done from remote Grounding switch should ensure no current flow in permitted work zone 1½ Breaker ABB Group May 22, 2014 Slide 31

26 Substation design Primary grounding switches Single busbar Double breaker Primary ground done from remote Grounding switch should ensure no current flow in permitted work zone 1½ Breaker ABB Group May 22, 2014 Slide 32

27 Substation design Saving space Conventional solution High maintenance requirements of isolators Large space requirements Standard DCB solution 30% space saving Quick isolation from system with disconnecting link Extremely compact DCB solution 75% space saving Extremely compact with BB on top of DCB ABB Group May 22, 2014 Slide 33

28 Substation design Layout example of 132 kv sectionalized single bus Disconnecting link Buscoupler DCB + CT without earthing switch Section Clearance DCB + CT on one support structure Busbar motor operated earthing and VT on one support structure. Line Entrance Module, VT and SA on one support structure May 22, 2014 Slide 34

29 Substation design Comparison for 132 kv sectionalized single bus Space comparison 40 m Conventional: 1720 m 2 28 m DCB: 616 m 2 22 m Downtime for single line (hours/year) Availability Downtime for single transformer (hours/year) Downtime for parallel objects (hours/year) 43 m Conventional DCB May 22, 2014 Slide 35

30 Substation design Comparison for 132 kv sectionalized single bus ABB Group May 22, 2014 Slide 36

31 Substation design 550 kv Breaker-and-a-half Cost savings: DCB: 10 % (900k USD/Bay) FOCS: 13.5 % (1100k USD/Bay) 550 kv 1½ CB (kusd) 550 kv 1½ DCB (kusd) 550 kv 1½ DCB con FOCS (kusd) ABB Group May 22, 2014 Slide 46

32 Substation design 420 kv double breaker Extreme availability double breaker transmission substation Switchgear 420 kv, 4000 A, 40 ka

33 Substation design 420 kv double DCB + FOCS Extreme availability double breaker transmission substation Switchgear 420 kv, 4000 A, 40 ka

34 Substation design 420 kv double breaker ABB Group May 22, 2014 Slide 49

35 Substation design Indoor substations Turnkey delivery of 145/12 kv indoor substation 2 x 145 kv transformers á 32.5 MVA (Moved from old site) 2 x 145 kv cable bays 2 x 145 kv transformer bays 31 x 12 kv outgoing bays 2 x aux.transformers 12/0,4 kv 1 x capacitor bank 21.4 x 19.3 m Relay and protection Batteries ABB Group May 22, 2014 Slide 50

36 Substation design Indoor substations

37 Substation design Indoor substations Indoor DCB ring bus solution ABB Group May January 22, , 2011 Slide Slide 52 52

38 Substation design Indoor substations High Voltage Section, Transformers and Medium voltage under the same roof

39 Substation design Extremely compact substations Gävunda Vansbro Hunflen T2 T1 Östra Extremely compact distribution substation Switchgear 72.5 kv, 2500 A, 25 ka

40 Substation design Buyer s and Application Guides Download from abb.com/highvoltage Design application ABB High Voltage Products May 22, 2014 Slide 55

41 Innovative breaker solutions How to enable innovative solutions in your specifications and refurbishments

42 How to enable innovative solutions Functional specification Apparatus specification Specified equipment characteristics Specified configuration etc Advantage Low investment cost Disadvantage Risk of old technology brought into substation Higher long term costs Functional specification Basic information of the number of connecting objects Specific concerns on availability etc. Advantage Allows for EPC to propose modern technology Allows for optimized substation performance and cost to the demand Disadvantage Technically demanding evaluation process

43 How to enable innovative solutions Functional specification Functional specifications enable substation optimization for the demand ABB Group May 22, 2014 Slide 58

44 How to enable innovative solutions DCB + FOCS Functional specifications enable substation optimization for the demand Solutions in accordance with IEC are allowed/will be considered. Alternative solutions are allowed. Alternative solutions are allowed. Solutions with current measurement systems utilizing the faraday affect is allowed. ABB Group May 22, 2014 Slide 59

45 How to enable innovative solutions LTA Your inquiry shall state that the HV circuit breakers shall be of the SF 6 gas type or any environmental friendly extinguishing medium, designed & tested in accordance with IEC Insulation Medium should be of environmental friendly type, and circuit breakers should be tested in accordance to IEC Alternative insulation medium, except oil, is allowed if proven to pass type tests in accordance to IEC and IEC

46 ABB Group May 22, 2014 Slide 61