Large Disturbances During 2014 in Power System of Serbia

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1 Large Disturbances During 2014 in Power System of Serbia (32 nd Conference of CIGRE Serbia, Zlatibor, May 2015) by Gojko Dotlić

2 SO3 SU3 SR NS3 SANDORFALVA ZR2 Power Transmission System of Serbia RAZVOJ PRENOSNE MREZE U PERIODU GODINE BG5 BG17 Presented large disturbances: 1. Floodings in May Thunderstorm in June Ice-rain in December 2014 SM2 ML OB B SA B 3 VA3 BB A BG3 OB KOL B CA3 BG20 BG8 KG2 PA2 KS1 SM3 DRM JA 4 BO2 DJE1 VISEGRAD PO1 KR3 BIS NI2 PLJEV KO B LE2 SOFIJA G L PR4 RIBAREVINA PE 3 KOA VR FIERZA PZ2 SKOPLJE

3 1. Floodings in May 2014 Surface coal-mine Kolubara Two mines were flodded: Tamnava Attacked RAZVOJ PRENOSNE MREZE U PERIODU West Field and Tamnava East Field. region GODINE Assesment of water quantity were: about 187 milions of cubiles (m 3 ) in Tamnava West Field and 25 milions of cubiles (m 3 ) in Tamnava East Field. Five rotation excavators were complitely flooded, as well as other mine equipment. PLJEV SO3 SM2 VISEGRAD RIBAREVINA SA 3 SR VA3 BB OB B BIS SU3 ML PE 3 B NS3 PO1 A BG5 FIERZA OB CA3 BG3 KOL B SANDORFALVA ZR2 BG17 KR3 G L BG8 BG20 KG2 KOA PZ2 KO B PA2 KS1 SM3 PR4 DRM JA 4 SKOPLJE NI2 VR LE2 BO2 DJE1 SOFIJA

4 1. Floodings in May 2014 Surface coal-mine Kolubara

5 1. Floodings in May 2014 Surface coal-mine Kolubara

6 1. Floodings in May Transmission SO3 SR SU3 NS3 SANDORFALVA ZR2 Attacked region RAZVOJ PRENOSNE MREZE U PERIODU GODINE BG5 BG17 BG20 SM2 ML PA2 OB B BG3 OB DRM SA 3 B BG8 SM3 DJE1 A KOL B VA3 KG2 JA 4 BO2 CA3 BB KS1 VISEGRAD PO1 KR3 BIS NI2 PLJEV Substation 400/220 kv Obrenovac RIBAREVINA PE 3 FIERZA G L KOA PZ2 KO B PR4 VR LE2 SOFIJA SKOPLJE

7 1. Floodings in May 2014 Photos in Transmission

8 1. Floodings in May Transmission The main steps did in substation 400/220 kv Obrenovac : All generators (except one for auxiliary supply thermal power plant) were switched off. All transformers 400/220 kv were switched off. All bus couplers are switched off. The control voltage 220Vdc were switched off in 220 and 400 kv switchyard (SCADA out of operation, no control, no protection, no interlocking, etc.). All MCBs of VTs were switched off (located in the box on middle supports). NOTE: Actually, all busbars were transferred in nodes ( solid connections ) with all OHLs switched on. OHLs are protected on remote sides only.

9 1. Floodings in May Tranmission What is the lesson? Relay house Relay house

10 1. Floodings in May Distribution Distribution Central Office in City Obrenovac Distribution Central Storage after Flooding

11 1. Floodings in May Distribution Distribution network before flooding: 5 substations 35/10 kv 372 substations 10/0,4 kv 344 km cables 10 kv Distribution network after flooding: One substation 35/10 kv Obrenovac completely flooded 150 substations 10/0,4 kv without supply and 95 of them completely flooded.

12 2. Thunderstorm in June 2014 SO3 SR SU3 SANDORFALVA ZR2 Attacked region RAZVOJ PRENOSNE MREZE U PERIODU GODINE NS3 BG5 BG17 BG20 SM2 ML PA2 OB B BG3 OB DRM SA 3 B BG8 SM3 DJE1 A KOL B VA3 KG2 JA 4 BO2 CA3 BB KS1 VISEGRAD PO1 KR3 BIS NI2 PLJEV KO B LE2 SOFIJA G L PR4 RIBAREVINA PE 3 KOA VR FIERZA PZ2 SKOPLJE

13 2. Thunderstorm in June :10 18:10 18:23 18:27 16:52 30 km

14 2. Thunderstorm in June 2014 Number of destroyed 110kV towers OHL No. Fall down Useless 120/ / / Totally 13 4 Totally destroyed 17

15 2. Thunderstorm in June 2014 The main characteristic: All towers were broken at the middle!? The attacked route wasn t wide (only km)

16 2. Thunderstorm in June 2014 Very good experience with mobile aluminium towers.

17 2. Thunderstorm in June 2014 What is the lesson? Parameters for designing OHLs are under reviewing. For example, wind pressure from P=60 dan/m 2 (which is equivalent to wind speed of 108 km/h) should be replaced with wind pressure from P=75 dan/m 2 (which is equivalent to wind speed of 126 km/h).

18 3. Ice-rain in December 2014 What is ice-rain? Hot air Rain Ice-rain Sleet Snow

19 3. Ice-rain in December 2014 Combination: ice-rain snow storm siberian coldness

20 3. Ice-rain in December 2014 The results of combined meteorological factors : horizontal icicles!!!

21 3. Ice-rain in December Transmission 110kV OHL No. Fall down 128/3 1 Number of destroyed towers Useless Temporary in service (for repairing) / / B Totally Totally destroyed 75 PLJEV SO3 SM2 VISEGRAD RIBAREVINA SA 3 SR VA3 BB OB B BIS SU3 ML PE 3 B NS3 PO1 A BG5 FIERZA OB CA3 BG3 KOL B SANDORFALVA ZR2 BG17 KR3 G L BG8 BG20 KG2 KOA PZ2 KO B PA2 KS1 SM3 Attacked region RAZVOJ PRENOSNE MREZE U PERIODU GODINE PR4 DRM JA 4 SKOPLJE NI2 VR LE2 BO2 DJE1 SOFIJA

22 3. Ice-rain in December 2014 Photos in Transmission

23 3. Ice-rain in December 2014 Photos in Transmission

24 3. Ice-rain in December 2014 Photos in Transmission

25 3. Ice-rain in December Distribution SANDORFALVA Replaced equipment Steel lattice towers (pieces) Quantity 47 for 35kV SO3 SR SU3 NS3 BG5 ZR2 BG17 BG20 Attacked region RAZVOJ PRENOSNE MREZE U PERIODU GODINE Reinforced concrete towers (pieces) 16 for 35kV SM2 SA 3 OB B ML B OB BG3 BG8 PA2 SM3 DRM DJE1 30 for 10kV VA3 A KOL B Wooden towers (pieces) 700 for 10kV BB CA3 KG2 JA 4 BO for 0.4kV VISEGRAD BIS PO1 KR3 KS1 NI2 ACSR conductor (tons) 15.2 PLJEV KO B LE2 SOFIJA ABC cables (km) 9 RIBAREVINA PE 3 G L KOA PR4 Insulators (pieces) 3000 FIERZA PZ2 VR SKOPLJE

26 3. Ice-rain in December 2014 Photos in Distribution

27 3. Ice-rain in December 2014 The result of ice-rain was that from 16:55 hours on all substations 110/X kv in this region: Majdanpek 1, Majdanpek 2 and Majdanpek 3, were out of service. The consume 110kV without supply was cca. 20MW.

28 3. Ice-rain in December 2014 What we did for the first moment? We decided to use 400kV OHL No. 401/2 as temporary connection for substation 110/35kV Majdanpek 1 via solid connections: 110kV OHL No and 400kV OHL No. 401/2, as well as 110kV OHL No. 150 and 400kV OHL No. 401/2. Temporary connection was finished on in 21:07 hours and supplied at first substation 110/35kV Majdanpek 1 and later all other substations 110/XkV.

29 3. Ice-rain in December 2014 SO3 SM2 VISEGRAD PLJEV RIBAREVINA SA 3 SR VA3 BB OB B BIS SU3 ML PE 3 B NS3 PO1 A BG5 FIERZA OB CA3 BG3 KOL B SANDORFALVA ZR2 BG17 KR3 G L BG8 BG20 KG2 KOA PZ2 KO B PA2 KS1 SM3 PR4 RAZVOJ PRENOSNE MREZE U PERIODU GODINE DRM JA 4 SKOPLJE NI2 VR LE2 BO2 DJE1 SOFIJA What was the risk of temporary usage the section of 400kV OHL No. 401/2 as 110kV OHL? The complete generation of HP Đerdap 1 was on only one direction through 400kV OHLs: No. 402 Đerdap 1 Bor 2 and No. 403 Bor 2 Niš 2. Unfortunately, in the night 09/ happened the outage of 400kV OHL No. 403 Bor 2 Niš 2 and they didn t succeed to synchronize this 400kV direction (phase discrepancy was >35 ). Therefore, urgently we decided to remove temporary connections of 400kV OHL No. 401/2. The reinstallation was finished on in 11:39. During this 7 days we succeed to provide some 110kV connections to the region. The repairing of transmission network is still in work.

30 3. Ice-rain in December 2014 Thank you for your attention.

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