Large Disturbances During 2014 in Power System of … · 1. Floodings in May 2014 - Transmission...

Large Disturbances During 2014

in Power System of Serbia

(32nd Conference of CIGRE Serbia, Zlatibor, 17.-21. May 2015)

by Gojko Dotlić

3rd Management Board of SEERC meeting, Kiev (UKR) , 23rd June 2015

Presented large disturbances: 1. Floodings in May 2014 2. Thunderstorm in June 2014 3. Ice-rain in December 2014


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RAZVOJ PRENOSNE MREZE

U PERIODU

2005-2010. GODINE

PE 3

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Power Transmission

System of Serbia

1. Floodings in May 2014 – Surface coal-mine “Kolubara”


• Two mines were flodded: „Tamnava West Field“ and „Tamnava East Field“.

• Assesment of water quantity were: about 187 milions of cubiles (m3) in „Tamnava West Field“ and 25 milions of cubiles (m3) in „Tamnava East Field“.

• Five rotation excavators were complitely flooded, as well as other mine equipment.

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U PERIODU

2005-2010. GODINE

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Attacked region





1. Floodings in May 2014 - Transmission


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U PERIODU

2005-2010. GODINE

PE 3

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Attacked region

Substation 400/220 kV “Obrenovac”

1. Floodings in May 2014 – Photos in Transmission


1. Floodings in May 2014 - 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.

1. Floodings in May 2014 - Tranmission


What is the lesson?

Relay house

Relay house

1. Floodings in May 2014 - Distribution


Distribution Central Office in City Obrenovac

Distribution Central Storage after Flooding

1. Floodings in May 2014 - 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.

2. Thunderstorm in June 2014


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U PERIODU

2005-2010. GODINE

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Attacked region

2. Thunderstorm in June 2014 – 25.06.2014.


18:10

18:10

18:23 18:27

16:52

30 km



110kV

OHL No.

Number of destroyed

towers

Fall down Useless

120/1 3

120/2 2

123/1 1

157 4 3

1223 3 1

Totally 13 4

Totally

destroyed 17



The main characteristic: • All towers were

broken at the middle!?

• The attacked route wasn’t wide (only 0.5-1 km)



Very good experience with mobile aluminium towers.



What is the lesson? Parameters for designing OHLs are under reviewing. For example, wind pressure from P=60 daN/m2 (which is equivalent to wind speed of 108 km/h) should be replaced with wind pressure from P=75 daN/m2 (which is equivalent to wind speed of 126 km/h).

3. Ice-rain in December 2014


What is ice-rain?

Hot air

Rain Ice-rain Sleet Snow



Combination: □ ice-rain □ snow □ storm □ „siberian“ coldness



The results of combined meteorological factors : horizontal icicles !!!

3. Ice-rain in December 2014 - Transmission


110kV

OHL No.

Number of destroyed towers

Fall down Useless

Temporary

in service

(for repairing)

128/3 1

177 4 4

193/1 9 14 2

148/2 4

1212 1

150 19 5 2

122B 4 4 1

Totally 38 23 14 Totally

destroyed 75 PZ2

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U PERIODU

2005-2010. GODINE

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Attacked region

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






3. Ice-rain in December 2014 - Distribution


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U PERIODU

2005-2010. GODINE

PE 3

KOL B

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Attacked region

Replaced equipment Quantity

Steel lattice towers (pieces) 47 for 35kV

Reinforced concrete towers (pieces) 16 for 35kV

30 for 10kV

Wooden towers (pieces) 700 for 10kV

1400 for 0.4kV

ACSR conductor (tons) 15.2

ABC cables (km) 9

Insulators (pieces) 3000

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




The result of ice-rain was that from 16:55 hours on 01.12.2014. 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.



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. 1159 and 400kV OHL No. 401/2, as well as 110kV OHL No. 150 and 400kV OHL No. 401/2. Temporary connection was finished on 03.12.2014. in 21:07 hours and supplied at first substation 110/35kV Majdanpek 1 and later all other substations 110/XkV.



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 09/10. 12.2014. 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 11.12.2014. 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.

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U PERIODU

2005-2010. GODINE

PE 3

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Thank you for your attention.

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Large Disturbances During 2014 in Power System of … · 1. Floodings in May 2014 - Transmission...

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