Study Case Strengthening of Rust De Winter Supply Area

1. Study CaseStrengthening of Rust De Winter Supply Area Contact Details Email : 012 421 4701 khumalqn@eskom.co.za : 011 711 2606 pieterbf@eskom.co.za Done by : Queeneth Khumalo : Brendon Pietersen 1

2. Study Area Traction N1 Freeway WARMBAD MTS R573 • Area is supplied by the Pelly (275/132 kV) and Warmbad (275/132/66 kV) MTSs. • The Rust De Winter substation are supplied via a 132 kV network from the Pelly MTS. • Warmbron Rural is supplied via 66 kV network from Warmbad MTS. R573 N1 Freeway 2

3. Existing Feeder Supply Zones Nokaneng 2013 MD: 7.4 MVA Total Length: 118 km Nyl Feeder 2013 MD: 6.7 MVA Total Length: 284 km Leeukraal 2013 MD: 6.7 MVA Total Length: 169 km Vergenoeg 2013 MD: 14.6 MVA Total Length: 54 km Haakdoring 2013 MD: 3.6 MVA 182 km 3

4. Existing Feeder Voltage Profiles Leeukraal 2009 MD: 5 MVA Total Length: 169 km V%: 92.9% Nokaneng 2009 MD: 5.5 MVA Total Length: 118 km V%: 89.4% Nyl Feeder 2009 MD: 4.7 MVA Total Length: 284 km V%:83.56% Vergenoeg 2009 MD: 7.8 MVA Total Length: 54 km V%: 96.7% Haakdoring 2009 MD: 3.2 MVA Length:182 km V%:94.8% 4

5. Back Round (New Loads) • Mahlanzeni Property Developer requested a new bulk supply of 400kVA for property development. The Developer’s point is at portion 13 of the Remainder of the Farm Kliprand 76 KR. The total number of units are 47 full title, a Hotel and 100 sectional title. The nearest pole to the position is pole number RH34/26 (Rust de Venter- Haakdoring 22kV feeder). • Vergenoeg Mine has applied for an increase in NMD from 7.5 to 10MVA (Standard supply) at Rust de Winter 132/22kV 2x10MVA substation. The requested NMD exceeds the feeder transmission capacity and will result in overloading of the substation installed capacity. 400 new jobs are expected to be created with this expansion. According to the mine’s General Manager, time is of the essence, thus Eskom is requested to provide supply as soon as possible. The mine anticipates an increase in demand for flourspar; a product that is used in several products that include nuclear fuel and refrigeration liquid. • There are electrification projects to be connected from Nokaneng 22kV (supplied from Rust de Winter substation). The total load of the electrification projects is expected to be 824kVA. • The customer Bigen Services Consultants Diluculo developer property Trading, has requested a new bulk supply of 2503kVA (715 connections) at 3.5kVA per connection per stand. The nearest pole to the position is pole number WP408/12/4 & WP408/13/6 (Warmbron Pienaarriver). 5

6. Summary of New Load Applications 6

7. Load forecast Substation Out of Capacity Network with New Load 7

8. New Loads 750 kVA for Electrification 400 kVA for Residential Developments 800 kVA fro Electrification 2.9 MVA for Residential Developments 2.5 MVA to Mine 8

9. Feeder Supply Zones with New Loads. Rust De Winter Supply Zone 2013 MD: 31.86 MVA Supply Capacity: 20 MVA Firm Capacity: 10 MVA Nokaneng 2013 MD: 6.01 MVA Total Length: 118 km Nyl Feeder 2013 MD: 6.7 MVA Total Length: 284 km Leeukraal 2013 MD: 5 MVA Total Length: 169 km Vergenoeg 2013 MD: 10.6 MVA Total Length: 54 km Haakdoring 2013 MD: 3.2 MVA 182 km New Development 9

10. Rust De Winter Supply Zone 2013 MD: 31.86 MVA Supply Capacity: 20 MVA Firm Capacity: 10 MVA Nokaneng 2013 MD: 7.4 MVA Total Length: 118 km Nyl Feeder 2013 MD: 6.7 MVA Total Length: 284 km Vergenoeg 2013 MD: 14.6 MVA Total Length: 54 km Haakdoring 2013 MD: 3.6 MVA 182 km Feeder Supply Zones with New Loads. New Development Leeukraal 2013 MD: 6.7 MVA Total Length: 169 km Note: The table refers to the minimum voltage of the feeders 10

11. Summary of Problems – Short Term & Long Term 11

12. Rust de Winter substation Increase the capacity at the substation by : Option 1: Install a third 10MVA 132/22kV Transformer Option 2: Install a 20MVA 132/22kV Transformer Option 3: Upgrade the substation to a 2X20MVA 132/22kV substation. Option 4: Upgrade the substation to a 2X40MVA 132/22kV substation Note: The MV feeders will only be split after the capacity of the substation has been increased. Strengthening of Haakdoring & Nokaneng Feeders Build the New Feeder Bay at Rust De Winter Substation called Diluculo feeder with the code (RDC). Build the 8km Hare conductor line from the Rust De Winter Substation and up to pole RH93 Create N/O between pole RH92 and RH93 to split the feeder. Close the existing N/O between pole RH277 and WP391/44. Create N/O at pole WP387.WP will be de-loaded by 600kVA to the new Diluculo feeder. Connect the 2.5MVA for Diluculo properties Customer. The New feeder will peak @ 3.8MVA with a minimum voltage of 98%. The old RH feeder will also peak @ 3.1MVA with the minimum voltage of 95.4%. Build 7.22m Hare Inter-connector from pole RH 163/1/42 to pole RNK 148/264. Make a N/O point between pole RNK148/208 and RNK148/207 Strengthening of Vergenoeg Feeder Install a 22kV feeder bay at Rust de Winter substation. Build 22kV 12km Chickadee line from Rust de Winter substation dedicate it to Vergenoeg mine. Disconnect the mine from the Vergenoeg 22kV feeder. Build 1.5km Hare interconnected from pole RV125/42 to pole RL60/66.Make a N/O point between pole RL 60 and RL60/1 Proposed short term solution 3X new 22kV FDR Bays 12

13. Remainder of Nakaneng 22kV 3X22kV feeder bays N/O Diluculo 22kV Remainder of Leeukraal 22kV Vergenoeg Mine Dedicated FDR Remainder of Haakdoring 22kV Vergenoeg 22kV Rust de Winter After FDRS’ Split 13

14. Long Term Solution 14

15. Bela-Bela Supply Area Sanria_Jantringh 22kV FDR Warmbron_Lehau 22kV FDR Sanria_Tuinplaas 22kV Warmbron_Nyl 22kV FDR Rust de Winter_Leeukraal 22kV FDR Pelly MTS Rust de Winter_Nokaneng 22kV FDR 15

16. Problem statement:Sanria, Rust de Winter, Warmbron & Pelly substations Sanria / Tuinplaas feeder: due to large customer base. Sanria / Lefiswana feeder: due to large customer base and exposure length. Rust de Winter / Leeukraal feeder: due to large customer base and exposure length. Rust de Winter / Haakdoring feeder: due to exposure length. Rust de Winter / Nokaneng feeder: due to large customer base. Warmbron / Pienaarsrivier feeder: due to exposure length. Warmbron / Lehau feeder: due to large customer base and exposure length. Warmbron / Radium feeder: due to large customer base. Warmbron / Nyl feeder: due to large customer base and exposure length. 16

17. Problem statement: Warmbron – Pienaarsrivier & Pelly – Klipdrift feeders • Voltage regulator installed. • Pienaarsrivier feeder transfer 4.3 MVA, lowest voltage on feeder is 91.29%. • Klipdrift feeder transfer 5.3 MVA, lowest voltage on feeder is 93.19 %. 17

18. Proposed Solution: Mantsole 1x10MVA, 132/22kV substation Warmbron • Build a 132 kV substation under line near pole PE/WA 184. • Build a 100 m loop-in loop-out 132 kV Chickadee lines from the Pelly MTS and the Warmbad MTS line from pole PE/WA 184. • Build a 132/22kV 2 X 10 MVA substation with 4 feeder bays and equip 3 bays. • Build a 0.2 km Hare line from the substation up to pole WP 311/49. • Establish a normal open point at poles WP 191. • Build an 8 km Hare line from the substation up to pole WP 313. • Establish a normal open point at pole WP 312. • Close the normal open point between the Pienaarsrivier and Klipdrift feeders. • Establish a normal open point at pole PK 25/177. • Build a 12 km Hare line from the proposed Mantsole substation up to the customer point of supply at pole WP 291. • Install a bulk metering point complete with a pole mounted recloser at the customer point of supply. • The remaining Pienaarsrivier feeder will transfer 1.6 MVA and the lowest voltage on the feeder will be 99.84 %. Pienaarsrivier Mantsole substation Klipdrift Pelly 18

19. Problem Statement: Warmbron–Lehau, Rust de Winter–Leeukraal & Nokaneng, Sanria – Tuinplaas • Mostly Electrification. More customers to be connected. • Tuinplaas feeder with 12000 customers needs strengthening. • Voltage regulator installed in Tuinplaas feeder, Feeder split done to solve voltage problems. • Leeukraal feeder & Nokaneng feeder voltages running low due to more electrification customers to be connected. 19

20. Proposed Solution: Biesieskuil 2x20MVA, 132/22kV substation Tuinplaas Lehau Biesieskuil substation Nokaneng Leeukraal 20

21. Proposed Solution: Biesiekuil 2x20MVA, 132/22kV substation • Marapajane • Build a 6 km Hare overhead line from Biesieskuil substation up to pole ST 101/21/9/162/10. • Establish a normal open point at pole ST 101/21/9/111. • This feeder can be called Marapajane 22 kV feeder with pole code BMP. • The Marapjane feeder will transfer 0.695 MVA and the lowest voltage in the feeder is 102.4 %. • Putten • Build a 3 km Hare overhead line from Biesieskuil substation up to pole ST 101/21/134/99/65. • Establish a normal open point at pole ST 101/21/134/1. • This feeder can be called Putten 22 kV feeder with pole code BPP. • The Putten feeder will transfer 0.456 MVA and the lowest voltage in the feeder is 102.6 %. • Katsibane • Build a 7 km Hare overhead line from Biesieskuil substation up to pole ST 101/21/134/99/13/29. • Establish a normal open point at pole ST 101/21/134/99/13/28. • This feeder can be called Katsibane 22 kV feeder with pole code BKB. • The Katsibane feeder will transfer 0.532 MVA and the lowest voltage in the feeder is 102.1 %. • Convey • Split the Nokaneng and Lehau feeders by building a 9 km Hare overhead line from Biesieskuil substation cup to pole RNK 280. • Establish a normal open point at pole RNK 150. • Close the normal open point between the Nokaneng and Lehau feeders at pole RNK 222 and WL 214/181/74. • Establish a normal open point at pole WL 214/59. • The feeder can be called Convey 22 kV feeder with pole code BCV. • De beers Put. • From the one feeder bay in the new proposed Biesieskuil substation, build a 5 km Hare line up to pole RL 203/21/95/2. • Establish a normal open point at pole RL 188. • The feeder can be called De Beers Put 22 kV feeder with pole code BDP. 21

22. Sanria, Rust de Winter, Warmbron, Biesiekuil, Mantsole, Nylsoog substations 22

23. Sanria, Rust de Winter, Warmbron, Biesiekuil, Mantsole, Nylsoog substations 23

24. Sanria, Rust de Winter, Warmbron, Biesiekuil, Mantsole, Nylsoog substations 24

25. Sanria, Rust de Winter, Warmbron, Biesiekuil, Mantsole, Nylsoog substations 25

26. Load forecast 26

27. Cost for Option 1(Short Term) 27

28. Recommendation • Both options will be implemented. The short term solution will cater for the Rust De Winter substation’s short term problem. • The long term solution will cater for the whole study area. • It is recommended to implement the short term solution seeing that the area is growing very fast. • This solution will be quicker than building a new substation and it will allow for future developments. 28

29. Thank you. Any Questions? 29