southern region - srldc · 5. wind generation in southern region 6. summary report a) commissioning...

QUARTERLY REPORT

OF

SOUTHERN REGION

Q3 (OCT-DEC’16)

SOUTHERN REGIONAL LOAD DESPATCH CENTRE

POWER SYSTEM OPERATION CORPORATION LTD

BANGALORE

INDEX

1. POWER SUPPLY POSITION a.) Peak Demand met and Unrestricted Demand b.) Demand Chart c.) Energy availability and Requirement d.) Energy availability and Requirement chart

2. QUALITY OF SERVICE a) Frequency profile b) Voltage Profile

3. INTERREGIONAL EXCHANGES 4. SCHEDULE VS DRAWAL OF STATES 5. WIND GENERATION IN SOUTHERN REGION 6. SUMMARY REPORT

a) Commissioning of new Generating units b) Commissioning of new Transmission lines c) Commissioning of new Substations d) Commissioning of new Line/Bus reactors. e) Transmission constraints & Voltage problems affecting Grid operation

i) Transmission constraints ii) ICT constraints iii) Low voltage iv) High voltage

f) Major Disturbances affecting Grid operation i) Grid Disturbances ii) Grid Incidences

1. POWER SUPPLY POSITION

a) Peak Demand Met and Unrestricted Demand

Month State/UTUnrestricted

Demand (MW)Peak Demand Met

(MW)Shortage (MW) Shortage (%)

Andhrapradesh7404.00 7404.00 0.00 0.00

Telangana7789.00 7789.00 0.00 0.00

Karnataka9574.26 9574.26 0.00 0.00

Kerala3606.97 3603.80 3.17 0.09

Tamilnadu14687.70 14687.70 0.00 0.00

Pondicherry338.00 338.00 0.00 0.00

S.Region41647.50 41610.00 37.50 0.09

Andhrapradesh7296.00 7296.00 0.00 0.00

Telangana7561.00 7561.00 0.00 0.00

Karnataka9888.01 9870.57 17.45 0.18

Kerala3625.40 3622.24 3.17 0.09

Tamilnadu14163.30 14163.30 0.00 0.00

Pondicherry341.00 341.00 0.00 0.00

S.Region40192.00 40192.00 0.00 0.00

Andhrapradesh7135.81 7117.00 18.81 0.26

Telangana7835.44 8220.00 -384.56 -4.68

Karnataka9330.58 9330.58 0.00 0.00

Kerala3532.61 3528.39 4.22 0.12

Tamilnadu13583.70 13583.70 0.00 0.00

Pondicherry321.00 321.00 0.00 0.00

S.Region38553.00 38528.00 25.00 0.06

Oct-16

Nov-16

Dec-16

b.) SR Demand chart

Month Peak Demand(MW) Demand Met(MW) Shortage(MW) % Shortage

Oct-16 41647.50 41610.00 37.50 0.09

Dec-16 38553.00 38528.00 25.00 0.06

Nov-16 40192.00 40192.00 0.00 0.00

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

Oct-16 Nov-16 Dec-16PEAK 41647 40192 38553DEMAND MET 41610 40192 38528

Dema

nd (M

W)

Peak Vs Unrestricted Demand (MW)

c) Energy availability and Requirement(MU)

Month State/UTRequirement

(MU)Energy met

(MU)Shortage (MU) Shortage (%)

Andhrapradesh4820.80 4820.15 0.65 0.01

Telangana4557.82 4557.13 0.69 0.02

Karnataka5984.58 5983.67 0.91 0.02

Kerala2000.40 1999.52 0.88 0.04

Tamilnadu9060.42 9059.13 1.29 0.01

Pondicherry205.80 205.77 0.03 0.02

S.Region26629.82 26625.37 4.45 0.02

Andhrapradesh4845.62 4844.16 1.45 0.03

Telangana4373.86 4372.31 1.55 0.04

Karnataka6230.92 6185.88 45.03 0.73

Kerala2006.25 2003.93 2.31 0.12

Tamilnadu8885.85 8882.99 2.87 0.03

Pondicherry202.99 202.55 0.44 0.22

S.Region26545.49 26491.84 53.65 0.20

Andhrapradesh4313.00 4311.29 1.71 0.04

Telangana4509.13 4507.32 1.81 0.04

Karnataka5776.52 5774.15 2.37 0.04

Kerala1959.10 1952.29 6.81 0.35

Tamilnadu8035.80 8032.44 3.36 0.04

Pondicherry184.12 184.03 0.09 0.05

S.Region24777.67 24761.52 16.15 0.07

Oct-16

Nov-16

Dec-16

d) Energy availability and Requirement(MU) chart

Month Requirement (MU) Availability(MU) Shortage % Shortage

Nov-16 26545.49 26491.84 53.65 0.20

Dec-16 24777.67 24761.52 16.15 0.07

Oct-16 26629.82 26625.37 4.45 0.02

0

5000

10000

15000

20000

25000

30000

Oct-16 Nov-16 Dec-16Requirement (MU) 26630 26545 24778Availability(MU) 26625 26492 24762

Energ

y (Mu

)

Energy availability and Requirement(MU)

2. QUALITY OF SERVICE

a) Frequency Profile (% time)

Month <49.7 <49.7-49.9 49.9-50.05 >50.05-50.20 >50.2

Oct-16 0.00 7.31 75.43 17.22 0.05

Nov-16 0.08 10.90 72.54 16.43 0.05

Dec-16 0.00 6.78 74.63 18.57 0.02

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

Oct-16 Nov-16 Dec-16<IEGC 7.31 10.98 6.78IEGC 75.43 72.54 74.63>IEGC 17.26 16.48 18.59

% of

Tim

e

Frequency Profile

b) Voltage Profile

Month

Station Max(kV) Min(kV) Max(kV) Min(kV) Max(kV) Min(kV)

Ramagundam 424 409 422 411 424 405

Hyderabad 426 404 426 406 428 401

Bangalore 416 406 419 401 425 402

Madras 421 409 426 403 430 407

Neyveli 420 410 418 403 420 400

Kolar 424 414 427 406 430 412

Vijaywada 429 410 435 413 428 411

Trichur 418 396 411 390 423 383

Udumalpet 431 417 414 401 432 396

3. INTER-REGIONAL EXCHANGES(PHYSICAL) in MU

Month Bhadravati Gazuwaka Talcher-KolarKUDGI-

KHOLAPUR

Import SR(MU)Import SR(MU)

Import SR(MU)Net Import (MU)

Oct-16 657 427 1171 166

Nov-16 694 454 1320 212

Dec-16 564 419 1228 153

1326

1248

Oct-16 Nov-16 Dec-16

Raichur-Sholapur Line

Import SR(MU)

1211

4. SCHEDULE Vs ACUAL DRAWAL BY STATES

Month STATE/UT Schedule (MU) Drawal (MU) OD(+)/UD(-)

APTRANSCO 513.74 600.03 86.29

TSTRANSCO 2313.45 2351.17 37.72

KPTCL 2323.15 2481.01 157.86

KSEB 1550.78 1616.72 65.94

TNEB 4058.14 4082.72 24.58

PONDY 215.35 205.77 -9.58

GOA 51.44 51.51 0.07

APTRANSCO 771.03 835.24 64.21

TSTRANSCO 2040.89 2084.65 43.76

KPTCL 2323.42 2440.82 117.4

KSEB 1600.37 1678.27 77.9

TNEB 4373.72 4376.70 2.98

PONDY 207.46 196.02 -11.44

GOA 49.37 48.15 -1.22

APTRANSCO 771.03 835.24 64.21

TSTRANSCO 2040.89 2084.65 43.76

KPTCL 2323.42 2440.82 117.4

KSEB 1600.37 1678.27 77.9

TNEB 4373.72 4376.70 2.98

PONDY 207.46 196.02 -11.44

GOA 49.37 48.15 -1.22

Oct-16

Nov-16

Dec-16

5.) Wind Generationin Southern region during Quarter-2

Month AP(MU) KAR(MU) TN (MU) SR (MU)

Oct-16 137.37 256.16 990.24 1383.77

Nov-16 87.76 251.54 196.50 535.80

Dec-16 129.89 297.14 249.42 676.45

5.1)% of wind in the total demand met by Region

Month TOTAL WIND(MUs)

ENERGY MET (MUs)

Oct-16 1383.77 26625.37

Nov-16 535.80 26491.84

Dec-16 676.45 24761.52

%ENERGY MET

5.20

2.02

2.73

0.00

500.00

1000.00

1500.00

2000.00

2500.00

3000.00

AP KAR TN SR

129212 315

656

235369

907

1,511

367

547

1,885

2,798

Oct-16 Nov-16 Dec-16

WIND GENERATION DURING QUARTER -3

020406080100

120

01/Oct/1602/Oct/1603/Oct/1604/Oct/1605/Oct/1606/Oct/1607/Oct/1608/Oct/1609/Oct/1610/Oct/1611/Oct/1612/Oct/1613/Oct/1614/Oct/1615/Oct/1616/Oct/1617/Oct/1618/Oct/1619/Oct/1620/Oct/1621/Oct/1622/Oct/1623/Oct/1624/Oct/1625/Oct/1626/Oct/1627/Oct/1628/Oct/1629/Oct/1630/Oct/1631/Oct/16

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6. SUMMARY REPORT

I)IMPORTANT EVENTS

a)COMMISSIONING OF NEW GENERATING UNITS

SL.NO. STATE/ISGS CAPACITY (MW) TYPE DATE

b)COMMISSIONING OF NEW TRANSMISSION LINES

SL.NO. CONSTITUENT KV LENGTH (kM) DATE

1 POWERGRID 400 187.8 29-12-2016

2 POWERGRID 400 165.45 29-12-2016

3 POWERGRID765 kV

Charged 400 kV 368.84 11-11-2016

4 POWERGRID765 kV

Charged 400 kV 368.84 11-11-2016

5 Inter State 400 kV 197.8 18-11-2216

6 POWERGRID 400 202.7 21-10-2016

7 POWERGRID 400 202.7 21-10-2016

8 COASTAL 400 27-10-2016

9 COASTAL 400 29-10-2016

c)COMMISSIONING OF NEW SUBSTATIONS

SL.NO. CONSTITUENT STATION NAME KV RATIO CAPACITY (MVA) DATE

1 APTRANSCO 400/220kV 315

d)COMMISSIONING OF NEW LINE / BUS REACTORS

SL.NO. CONSTITUENT BUS/LINE CAPACITY (MVAR) DATE

1 POWERGRID BUS 125.00

2 POWERGRID BUS 125.003 POWERGRID BUS 125.004 APTRANSCO BUS 125.005 POWERGRID BUS 125.00

URAVAKONDATRIVANDRAM

400 kV Nagapattinam -Dharmapuri-1

400 kV Nagapattinam -Dharmapuri-2

400 kV Coastal -Tuticorin Pooling Station -2

400 kV Coastal -Tuticorin Pooling Station -2

KUDGINARENDRA

Jammalamadugu ICT1

STATION NAME

HASSAN

VIJAYWADA-VEMAGIRI

VEMAGIRI-GAZUWAKA

Dharmapuri-Tuticorin -1

Dharmapuri-Tuticorin - 2

Urvukonda-Veltoor - 2

STATION NAME

LINE NAME & CKT NO.

अनुभाग-1 / Section-1:

a) ट्ाांसमिशन कने््स्ट्न्ट / Transmission Constraints:

S. No Corridor Season/ Antecedent Conditions

Description of the constraints Figure/ table no.

Has the constraint occurred in earlier quarter?

1 400kV Nellore Pooling Station - Nellore DC line

Whole Year

With Full Generation at SEPL (600 MW), MEPL (300 MW) & TPCIL (2x660 MW) , the 400kV NPS- Nellore D/C flow is usually more than 1500 MW and it has reached up to 1900 MW. With further commissioning of Units at MEPL(stage-2-2x350MW) , the problem will aggravate

Figure - a1 Yes

2

400kV Gooty-Nelamangala line & 400kV Gooty-Somanahalli line

Whole Year

With increase of SR Import to 5900 MW (ATC) and increase of Drawl by Karnataka & due to non-commissioning of 400kV Tumkur-Yelahanka DC line, the flow on 400kV Gooty-Nelamangala & 400kV Gooty-Somanahalli line are loading heavily without N-1 security. Loading on these lines have been partially relieved after 400kV Tumkur-Bidadi/Nelamangala rearrangement.

Figure - a2 Yes

3 400kV Udumalpet-Palakkad DC line

Whole year

Kerala drawl is mainly through 400kV Udumalpet-Palakkad D/C line. 400kV Mysore-Kozhikode DC line commissioned but the flow is limited by the ICT capacity at Kozhikode. Present loading on these lines is in the range of 420-500 MW.

Figure-a3 Yes

4 400kV Hiriyur-Nelamangala DC line

Whole year

With Full generation at Jindal TPS, Bellary TPS, Low generation at UPCL and high wind generation, the flow on 400kV Hiriyur-Nelamangala D/C line is continuously above 550MW. The commissioning of YTPS generators will further aggravate the situation. Non-commissioning of 400kV Tumkur-Yelahanka D/C line and its associated downstream 220kV network also is creating further increase in the line flow.

Figure-a4 Yes




5 220 kV Bangalore Metro Network

Whole Year

220 kV Metro networks (Bangalore Urban area) are now radialised to prevent overloading of lines. The radialisation decreases the reliability of supply.

- Yes

6

Overloading of 220 kV Shoolagiri- Hosur(TN)- Yerrandahalli- Somanahalli SC line

Whole Year

Somanahalli, Yerrandahalli and Hosur are Industrial areas. 220kV Yerandahalli is connected with Hosur(TN) and Somanahalli. Normally, 220kV Yerandahalli is split and part of its load is fed from Hosur (TN) as the Entire load cannot be met from either side (Somanahalli or Hosur). The line flow on this line is also causing high flows on Shoolagiri-Hosur 230 kV S/C line.

- Yes

7

220 kV Sharavathy-Shimoga lines (3 nos) and 220 kV Sharavathy-Talaguppa line (3Nos.).

During full generation in Sharavathi

With full generation at Sharavathy HEP (>900 MW) there is no N-1 reliability on 220 kV Sharavathy-Shimoga lines and With re-arrangement of circuits at Sharawathi, now there are 3 circuits to Talaguppa. With this the constraint relieved some extent.

- Yes

8

Constraints for Rayalaseema TPS Generation Evacuation

Whole Year

The Southern AP loads have increased and with increased generation at Rayalaseema TPP ( 5 units on bar at present , 220 MW each and 5th unit has been added without augmenting the evacuation system which was designed for 2 units of 220 MW) the line loadings on the following 220 kV lines are of concern, 220kV Chinakampalli-Renigunta S/C, 220kV Chinakampalli-Rajampeta S/C, 220kV Chinakampalli-Kalikiri S/C line, 220kV RYTPP-Chinakampalli D/C line and 220kV Tadikonda-Parchur - Ongole S/C line

- Yes

9

Transformation Capacity at 400/220kV Kozhikode SS

Whole Year

400kV Mysore-Kozhikode DC line is commissioned without enough Transformation capacity at 400/220kV Kozhikode, which became bottle neck for import of power in North Kerala.

- Yes




10 Constraints in Nagjheri PH evacuation

Whole Year

The 220kV Nagjheri – Ambewadi DC, 220kV Ambewadi – Narendra DC, 220kV Kaiga – Kodasally SC & 220kV Kadra – Kodasally SC lines are severely over-loaded. Re- conducturing of the above lines to HTLS is suggested.

11 Constraints in Chennai 230kV System

Whole Year

230kV Alamatty-Manali DC line, 230kV Manali-koratur, 230kV Kalavindapattu-S.PKoil, 230kV Kalavindapattu-Siruseri, 230kV NCTPS-ETPS line are severely loaded.

- Yes

12 Overloaded 220kV Lines in Tamil Nadu

Whole Year

The following lines are heavily loaded in Southern Tamil Nadu 230kV Madurai - Sembatty S/c, 230kV Madurai - Theni S/c , 230kV Pugalur - Mywadi S/c, 230kV Pudanchandai-Pugalur line

- Yes

13

Constraints in 230kV Evacuation lines of MTPS and Kundah complex

Whole year

230kV Kundah PH4-Thudialur line, 230kV MTPS-MTPS-III-Gobi line, 230kV MTPS-Ingur line and 230kV Pugalur4-Mywadi line, 230kV Arasur-

Arasur Dc line

- Yes

14 Constraints in wind Evacuation

During wind

season

230kV Veerannam-Abhishekpatti line, 230kV Karaikudi-Pudukottai line are loaded heavily

during Wind season - Yes

b)

ICT Constraints:

S. No ICT Season/ Antecedent Conditions


Has the constraint occurred in earlier quarter? Details.

1 400/220kV 2x315MVA ICTs at Gazuwaka SS

Whole Year N-1 condition not satisfied in few

occasions Figure-b1 Yes

2 400/220kV 2x315MVA

ICTs at Vemagiri SS Whole Year

N-1 condition not satisfied in few occasions

Figure-b2 Yes

3 400/220k 3X500 MVA ICTs at Nelamangala

Whole Year N-1 condition not satisfied in few

occasions Figure-b3 Yes

4 400/220kV 3X500 MVA

ICTs at Somanahalli Whole Year


Figure-b4 Yes

5 400/220kV 3X500 MVA

ICTs at Hoody Whole Year

N-1 condition not satisfied in few occasions. Second ICT at Hoody

which was under outage since June 2016 revived in Nov 2016

Figure-b5 Yes

6 400/220kV 2X315 MVA

ICTs at Guttur Whole Year


Figure-b6 Yes

7 400/220kV 2X315 MVA

ICTs at Hiriyur Whole Year


Figure-b7 Yes

8 400/220kV 2X315 MVA

ICTs at Narendra Whole Year


Figure-b8 Yes

9 400/230kV 2X315MVA

ICTs at Pugalur Whole Year


Figure-b9 Yes

10 400/230kV 2X315MVA

ICTs at Trichy Whole Year


Figure-b10 Yes

11 400/230kV 2X315MVA

ICTs at Madurai Whole Year


Figure-b11 Yes

12 400/230kV 2X315MVA

ICTs at Thiruvallam Whole Year


Figure-b12 Yes

13 400/220 kV 2X315 MVA

ICTs at Kozhikode Whole Year


Figure-b13 Yes

c)

Low Voltage:

S. No Nodes Season/

Antecedent Conditions

Description of the constraints Figure/

table no.

Has the constraint

occurred in earlier

quarter?

1 400kV Somnahally SS During peak load

condition Voltages are low during the peak

load condition Figure-c1 Yes

2 400kV Nelamangala SS During peak load



3 400kV Hoody SS During peak load



4 400kV Bidadi SS During peak load



5 400kV Arasur SS During peak load condition & high

wind period

Voltages are low during the peak load condition

Figure-c6 Yes

6 400kV Trichur SS During peak load



7 400kV Palakkad SS During peak load



8 400kV Cochin SS During peak load



9 400kV Trivendrum SS During peak load



d) High Voltage:

S. No Nodes Season/

Antecedent Conditions

Description of the constraints Figure/

table no.

Has the constraint

occurred in earlier

quarter?

1 400kV Vijayawada SS Whole Year Voltages remain very high most

of the time Figure-d1 Yes

2 400kV Vemagiri SS Whole Year Voltages remain very high most


3 400kV Gooty SS Monsoon period

and off peak period

Voltages remain very high most of the time

Figure-d3 Yes

4 400kV Kurnool SS Monsoon period

and off peak period


Figure-d4 Yes

5 400kV Nellore Pooling

Station SS Whole Year


Figure-d5 Yes

6 400kV Sattenapally Whole Year Voltages remain very high most


7 400kV VTPS Stage IV Whole Year Voltages remain very high most


8 400kV Hyderabad SS Monsoon period

and off peak period


Figure-d8 Yes

9 400kV Mamidipally SS During off peak Voltages remain very high most


10 400kV Srisailam LB SS During off peak Voltages remain very high most


11 400kV Malkaram SS During off peak Voltages remain very high most


12 400kV Narendra SS Whole Year During Low generation period

and off-peak period 400kV Narendra Voltage are High.

Figure-d12 Yes

13 400kV Karaikudi SS During off peak During Low wind condition and off-peak condition Voltages are very High

Figure-d13 Yes

14 400kV Pugalur SS During off peak During Low wind condition and off-peak condition Voltages are very High

Figure-d14 Yes

15 400kV Sriperumbudur

SS Whole Year


Figure-d15 Yes

16 765kV Raichur SS Whole Year Voltages remain very high most of the time

Figure-d16 Yes

17 765kV Kurnool SS Whole Year Voltages remain very high most of the time

Figure-d17 Yes

18 765kV Nellore PS Whole Year Voltages remain very high most of the time

Figure-d18 Yes

अनुभाग-2/Section 2:

a) Lines Opened on High Voltage

Sr.No. Name Total Corresponding Nodes

experiencing High Voltages

Graph No.

1 400 kV VEMAGIRI - GOUTHAMI CCCP 2 54 Vijaywada, Vemagiri , Sattennapalli, VTS IV,

Gooty , Kurnool , Nellore Pooling Station,

Mamidipally , Srisailam , Warangal, Malkaram ,

Kaiga, Guttur, Narendra, Tirunelvelli , Madurai,

Kudankulam , Thiruvalam, Pugalur, Nelamangala,

Talaguppa, Hassan, Kudgi

Figure Details E1

2 400kV SRISAILAM-SHANKARPALLY 49

3 400 kV KAIGA - NARENDRA 2 46

4 400 KV KUDGI PG - TUMKUR - 1 46

5 400 KV MAHABOOBNAGAR - URAVAKONDA - 1 46

6 400 KV URAVAKONDA - JAMMALAMADUGU - 1 43

7 400 KV URAVAKONDA - JAMMALAMADUGU - 2 43

8 765 KV KURNOOL - THIRUVALLM 2 42

9 400kV SURYAPET -MALKARAM 40

10 400kV VTPS -MALKARAM 38

11 765 KV KURNOOL - NPS 1 38

12 400 kV HYDERABAD - N'SAGAR 35

13 400 KV DHARMAPURI - TUTICORN PS - 2 32

14 400 kV PUGALUR - kARAIKUDI-2 32

15 400 kV HYDERABAD - KURNOOL 31

16 400 kV VEMAGIRI - GVK (JPD) 1 31

17 400 KV DHARMAPURI - NAGAPATNAM - 1 30

18 400 kV GUTTUR - NARENDRA 2 29

19 400 KV MAHABOOBNAGAR - URAVAKONDA - 2 29

20 400 kV KARAIKUDY - MADURAI 27

21 400 kV VEMAGIRI - GVK (JPD) 2 27

22 400 kV KAIGA - NARENDRA 1 22

23 400 kV Khammam-N'Sagar-2 21

24 400 kV TRICHY - KARAIKUDY 17

25 400 KV GOOTY - TUMKUR - 2 16

26 400 KV KUDGI - NARENDRA - 2 16

27 400 kV VIJAYAWADA - VEMAGIRI 2 15

28 400 KV VTPS IV - SATTENAPALLI 2 15

29 400 kV RAMAGUNDAM - HYDERABAD 4 14

30 400 kV TALAGUPPA - NEELAMANGALA 14

31 400 kV GUTTUR - NARENDRA 1 13

32 400 kV N'SAGAR - MAHABOOB NAGAR 13

33 400 kV VIJAYAWADA - VEMAGIRI 3 13

34 765 KV KURNOOL - THIRUVALLM 1 13

35 765 KV KURNOOL - NPS 2 11

36 400 KV ALAMATHI - THIRUVALLAM-1 9

37 400 KV GOOTY - TUMKUR - 1 7

38 400 KV KUDGI PG - TUMKUR - 2 7

39 400 KV DHARMAPURI - TUTICORN PS - 1 6

40 400 kV KAIGA - GUTTUR 1 5

41 400 KV KAMUDHI - KARAIKUDI 5

42 400 kV KAIGA - GUTTUR 2 4

43 400 kV KHAMMAM - MAMIDIPALLY 2 4

44 400 kV MYSORE - HASAN 1 4

45 400 Kv NELLORE - SPDR-1 4

46 400 kV MAHABOOB NAGAR - RAICHUR 3

47 400 Kv VTPS - SURYAPET 3

48 400 Kv KLVDPT - VALLUR 2 2

49 400 Kv KURNOOL(AP) - GOOTY 2

50 400 Kv NCTPS - VALLUR 1 2

51 400 kV N'SAGAR - CUDDAPPA 1 2

52 400 Kv VTPS - MALKARAM 1 2

53 220 kV KAIGA - KODASALLY 1

54 400 KV DHARMAPURI - NAGAPATNAM - 2 1

55 400 kV HASSAN - NEELAMANGALA 1 1

56 400 KV KAYATHAR - KAMUDHI - 1 1

57 400 kV Khammam-N'Sagar-3 1

58 400 kV KOLAR - HOODY 1 1

59 400 KV KUDGI - KOLHAPUR - 2 1

60 400 KV KUDGI - NARENDRA - 1 1

61 400 kV N P KUNTA - KOLAR 1

62 400 Kv NCTPS - SVCTM-II 1

63 400 kV RAMAGUNDAM - MALKARAM 1

64 400 kV RAMAGUNDAM - WARANGAL 1

65 400 Kv SATTENAPALLI - SRISAILAM 2 1

66 400 kV TALAGUPPA - HASSAN 1

67 400 kV VIJAYAWADA - NELLORE 2 1

68 400 Kv VTPS - NLR 1

69 765 KV RAICHUR - KURNOOL - 2 1

Grand Total 1089

अनुभाग-3/Section 3: Load Growth vis a vis Projections:

The tables are attached as EPS_LGBR_Data_Oct’16-Dec’16.xls. Please note that EPSR17 data has been used for 2007- 09 and EPS 18 has been used for 2009-15.

अनुभाग-4/Section 4: Generation Delayed

S. No Generating Unit Area/ State Proposed

Commissioning Date

Actual/ Likely Commissioning

Date

Transmission Constraint

Caused

1 Kudankulam Unit-2 Tamilnadu Dec-08

Unit-1 CoD in December

2014, Unit-2 Synchronised in

Aug 2016. Expected CoD in

December 2016. Unit-2

not yet declared CoD

Transmission congestion on North-South

corridor.

अनुभाग-5/Section 5: Transmission Addition in the quarter

The section may highlight transmission elements whose delayed/ early commissioning has caused a system constraint

S. No. Transmission Corridor

Proposed Commissioning Date/ Original

Target date

Actual/ Likely Commissioning

Date Transmission Constraint Caused

1 400kV Edamon-Cochin DC line Nov-08 RoW issues 220kV North - South corridor of

Kerala

2 Stage-1 Wind evacuation system of TNEB: 400kv Kanarapatty SS, 400kV Kanarapatty-

Kayathar DC line - -

Congestion on 400/230kV Tirunelveli ICTs, 230kV Kayathar-

Tirunelveli, 230kV Udayathur-Tirunelvelli, 230kV Veerannam-

Tirunelvelli etc.

3 400kV Tumkur-Yelhanka DC line Jun-14 RoW

issues/Dec-17

Constraints on Import from New grid to SR through 765kV Raichur-

Sholapur DC line.

4 400kV Somnahally-Dharmapuri PS Sep-14 RoW

issues/Mar-17 Congestion on S1-S2 Corridor

5 765kV Dharmapuri PS –Tumkur DC line Sep-14 Severe RoW

issues/Mar-17 Congestion on S1-S2 Corridor

अनुभाग-6/Section-6:

Grid Events

The section may detail near miss situations, incidents of multiple elements outage, natural calamities impacting the power system, oscillations observed in the system etc.

Grid Disturbances

Sl. No Event

Outage

Region Generation /

load loss

Category as per CEA Grid

Standards Date Time

1 Complete outage of Sharavathy hydro power station of KPCL.

05-Oct-16 15:35 SR Gen loss : 140 MW

GD-1

2

Complete outage of 230kV Taramani substation of TANTRANSCO.

05-Oct-16 23:09 SR load loss : 200 MW

GD-1

3

Complete outage of 230kV Palladam, 230kV O.K.Mandapam, 230kV Thudiyalur and 230kV Coimbatore.

13-Oct-16 19:58 SR load loss : 500 MW

GD-1

4 Complete outage of 220kV Brahmapuram substation.

15-Nov-16 0:31 SR load loss : 160 MW

GD-1

5

Tripping of running units at Neyveli complex (NLC TS-2 stage-1, NLC TS-1 and STCMS), 400/230kV ICT-1&2 at Trichy (PG) substation and 400/230kV ICT-1&2 at NLC TS-2. Loss of supply to 230kV Thrichy, Samayapuram, Cuddalore, Vilupuram, eechangadu, Perambalur, Alandur, Thanjavur, Thiruvarur, Kadalangudi, Thiruvannamalai and N.P.Kudi substation

25-Nov-16 17:22 SR

Load loss : 1500 MW, Generation loss : 800

MW

GD-1

6 Complete outage of 400kV NLC1EXP Station

11-Dec-16 0:44 SR

Generation loss : 200

MW GD-1

7 Load crash and Generation loss in Chennai area in tamilnadu due to cyclone Varda.

12-Dec-16 12:30 SR

load : 1500 MW,

Generation : 2570

GD-1

8 Complete outage of 400kV Guttur substation of KPTCL

17-Dec-16 19:13 SR Nil GD-1

9 Complete Outage of 220kV Peenya substation of KPTCL

19-Dec-16 23:03 SR Load loss: 350 MW

GD-1

Grid Incidents

Sl. No Event Outage

Region

Generation / load loss

Category Date Time

1 Tripping of HVDC Talcher-Kolar HVDC pole-1

05-Oct-16 23:50 SR/ER ---- GI-2

2

Tripping of 400kV Bus-B, at Srisailam left bank power station, 400kV Srisailam-Kurnool & 400kV Shankarapalli-Srisailam at Srisailam left bank power station.

05-Oct-16 16:46 SR ---- GI-2

3 Tripping of HVDC pole-1 at Bhadrawati 07-Oct-16 17:56 SR/ER ---- GI-2

4 Tripping of HVDC Talcher-Kolar pole-1 10-Oct-16 16:35 SR/ER ---- GI-2

5

Tripping of 230kV Bus-1 (400/230kV ICT 5 LV, Manali-1, Mosur, NCTPS, Thiruverkadu) at 230kV Alamathy Substation of TANTRANSCO

12-Oct-16 11:26 SR ---- GI-1

6 Tripping of Running units at Rayalaseema TPS-1, 3 and 5

13-Oct-16 16:56 SR Gen loss : 510

MW GI-2

7

Multiple trippign at NLC TS-2 power station (400kV Bus-2, 400kV NLC TS2 -Salem-2, 400kV NLC TS2 -NLC1Exp, 400kV NLC TS2 -NLC2Exp, 400/230kV ICT#1, NLC-II unit#4 and #5)

27-Oct-16 10:30 SR Gen loss :390

MW GI-2

8 Tripping of 400 kV NTPL - TTRNPS-1, 400 kV NTPL - TTRNPS-2 and unit#1 of NTPL

04-Nov-16 15:37 SR Gen loss= 350MW

GI-2

9 Tripping of 400/220 kV ICT-1, 2 and 3 @ Somanhalli

08-Nov-16 16:11 SR Load loss=

700MW GI-1

10 Tripping of VTPS Units- 2, 3 and 6 08-Nov-16 18:31 SR Gen loss= 480MW

GI-1

11 Tripping of VTPS Units- 1 to 6 12-Nov-16 10:26 SR Gen loss= 950MW

GI-1

12 Tripping of HVDC BHADRAVATHI POLE 2

21-Nov-16 1:14 SR ---- GI-2

13

Tripping of 230kV Bus-1 and connected 230kV elements (230kV Trichy 1, Tanjore 1, ICT-1, & Bus coupler CB) at 230 kV Alandur substaion of TANTRANSCO

09-Dec-16 15:40 SR --- GI-1

14 Tripping of 230kV Bus-1 and connected 220kV elements at 220kV Cudappah substaion of APTRANSCO

24-Dec-16 0:04 SR --- GI-1

15 Tripping of 220kV Bus (Western) at 220kV Chikodi substation of KPTCL

25-Dec-16 0:44 SR 230 MW GI-1

b) Frequency Response Characteristics

S. No Event Change in

Frequency(Hz)

Change in load(-)/

generation (+)(MW)

Frequency Response

Characteristics ( MW/Hz)

1

765 kV Lalitpur-Fatehabad and Unit 2 at Lalitpur tripped at 15:39 hrs.Unit#1 was then immediately backed down and was running under house load and at 15:45 hrs Unit

1 also tripped. Lalitpur went under black out. Total generation loss and load loss was approximately 1200

MW and 90 MW respectively.

-0.17 0 2262

2

HVDC Talcher-Kolar Pole-1 tripped at 23:50 hrs on 05-10-2016 due to Thyristor failure at Talcher end. Pole-2

successfully changed over to Metallic return mode, with power flow of 920 MW. HVDC Talcher Kolar SPS 1

operated resulting in load shedding of 930 MW in SR.

0.11 -930 4409

3 Due to multiple tripping at Dadri at 10:50 hrs, 1450 MW generation loss took place causing frequency fall by 0.07

Hz -0.07 0 1996

4

At 06:02 Hrs all running units in Anpara generation complex tripped due to tripping of 400kV Anpara-

Sarnath D/C. Generation loss of 2300 MW occurred. At the same time Vindhyachal Block-1 tripped due to DC

Over current protection.

-0.26 0 4198

5

On 23.12.2016, at 0127 hrs,all 400 kV lines from Kishenpur substation tripped except 400 kV Moga-Kishenpur-II which led to complete Valley(Kashmir)

system collapse.Total Load loss in J&K was about 1200 MW and Generation loss was of about 250MW(Uri-I-

40MW,Uri-II-38MW,Baghlihar-125MW,JK Hydro-30MW).

0.11 0 2416

Other issues:

If the fault level has crossed 32 kA, the buses may also be highlighted. DR outputs, if any, for actual event

illustrating this to be attached.

o With Full generation at MAPS & Bhavni and with interconnection, the Fault MVA touching 25kA, the

rated capacity of breaker.

o The substations where fault level exceeds 40kA are as mentioned below:

400kV Nellore (PG) 400kV Nellore (AP) 400kV Tiruvalum (TN) 400kV Tiruvalum (PG) 400kV Nellore PS (PG)

Any substation layout which affected grid operation adversely could also be highlighted.

o It is recommended to have uniform rating of LV/400kV for Generator Transformers connected to 400kV grid directly then only optimization of tap position give fruitful results.

o Substations where parallel circuits are on the same diameter are as mentioned below: At 400kV Alamatty SS, Vallur D/C, Thiruvalum D/C, SV Chatram D/C, NCTPS D/C and 400/220kV

ICT-1&2 are on the same diameter. At 400kV Alundur SS, 400/220kV ICT-1&2 are on the same diameter. At 400kV Hinduja SS, 400kV KV Kota D/C and 400kV Kalpakka D/C are on the same diameter. At 400kV Kayathar SS, 400kV Karaikudi D/C and 400/230kV ICT-1&2 are on the same diameter. At 400kV Kudamkulam SS, 400kV Thirunelvelli D/C are on the same diameter.

At Kakatiya TPS, 400kV Warangal D/C and 400kV Gajwel D/C are on the same diameter. At 400kV KTPS SS, 400kV Khammam D/C and 400/220kv, 80MVA ICT & 400/11kV, 50MVA ICT are

on same diameter. At Mettur-III SS, 400kV Tiruvalum D/C, 400kV Arasur D/C and 400/230kV ICT-1 & 2 are on same

diameter. At 400kV Udumalpet SS, 400/220kV ICT 1 & 2 is on same diameter. At 400kV Nunna SS, 400kV Vemagiri Ckt-III&IV are on the same diameter. At 400kV Salem (TN) SS, 400/110kV ICT-1&2 and 400/230kV ICT-1&2 are on the same diameter. At 400kV Simhadri (AP) SS, 400kV Kalpakka ckt-1&2 and Kalpakka ckt-3&4 are on the same

diameter. At 400kV Simhadri Stg-2 SS, 400kV Vemagiri D/C and 400kV Gazuwaka D/C are on the same

diameter. At 400kV SV Chatram SS, 400/110kV ICT-1&2, 400kV NCTPS D/C , 400kV Alamaty D/C and

400/230kV ICT 1&2 are on the same diameter. At 400kV VTS-IV SS, 400kV Sattenpalli D/C on same diameter. At 400kV Ramagundam SS, both Chandrapur circuits are on same Dia. At 400kV Gooty SS, both Nellore PS circuits are on same Dia.

o In future, it is recommended to avoid parallel circuits on the same Dia for reliability purposes.

Many KPTCL Stations at 220 kV level are operated as single bus. Many State 220 kV stations do not

have bus bar protection. These issues are being taken up at PCC meetings.

Vallur TPS (1500 MW) and NCTPS-II (1200MW) generation is connected at 400kV Bus and No 230kV path is

available to give start up supply in case of Blackout. So there is a need to provide 230kV path.

Kudankulam Nuclear Power Station (2 X 1000MW) generation is connected at 400kV Bus and on 230kV side it

has to depend on small Hydro generation for startup supply in case of blackout. The same needs to be

enhanced.

Absence of LVRT feature in wind turbines:

o It is observed that wind generation about 500 to 1000MW in Tamilnadu control area pulls out

during a delayed fault clearance of fault in grid (fault in 400/230 or 110kV network in

Tamilnadu).

o The sudden wind loss resulted in increase of power flow on 765kV Solapur Raichur lines-1&2

and resulting in SPS operation

Presently the interstate line between Karnataka and Telangana 220kV Raichur TPS - Jurala SC is being

operated in radial mode. Operating this line in grid mode would improve the reliability of system.

The following Interregional links has to be explored for import of power by deficit region,

o 220kV Upper Sileru-Balimela S/C line

National HVDC project of Lower Sileru-Barasoor line right of way has to be used for New inter connection

between SR & NEW Grid.

Due to non-commissioning of NGR bypass scheme, the conversion of line reactor into bus reactor is not

possible in the following lines, unless line shutdown is taken and jumper rearrangement works are done

which will take about 3 – 4 hours.

o 765 kV Kurnool-NPS-1&2

o 765 kV Kurnool-Thiruvalam-1&2

o 765 kV Nagapattinam – Dharmapuri 1 & 2 (Charged at 400kV)

o 765 kV Tuticorin PS – Dharmapuri 1 & 2 (Charged at 400kV)

Presently one line each of 765 kV Kurnool-NPS DC and 765 kV Kurnool-Thiruvalam DC are kept open due to

high voltage.

230kV MAPS – Bhavini line (80 MVA) is used for only startup purpose is always kept open. 230kV

Acharapakkam – Villupuram is open to avoid over-loading of 230kV Kalpakkam – Acharapakam S/C line.

230kV MAPS is left with only two sources i.e. 230kV MAPS - Arni SC & 230kV MAPS - SP Koil DC.

SPS Operations:

o Inter-Regional SPS operations:

o HVDC SPS operations:

o Intra-Regional SPS operations:

o SPS Mal operation: Details of SPS mal operation are given below:

Sl No Date Time SPS Operation

Total Load relief in SR (MW)

1 21-Oct-16 12:42

SPS for Kozhikode ICT-SPS signal received at 220kV Areakode, since

bus coupler was in open condition, no disturbance (Maloperation:

While taking ICT#1 for CB testing, SPS acted)

0

2 21-Oct-16 15:43

SPS for Kozhikode ICT-SPS signal received at 220kV Areakode and

kanhirode substations, resulting in the radial operation of Northern

Kerala (Maloperation: While taking ICT#1 for CB testing, SPS acted)

0

3 22-Oct-16 7:52

SPS signal (code-4) pertaining to 400kV Wardha-Parli/ 400kV Parli-

Solapur SPS received from Raipur to Kolar. Maloperation as no SPS

had operated in W.R

360

4 23-Oct-16 9:01

SPS for Kozhikode ICT-SPS signal received at 220kV Areakode and

kanhirode substations, resulting in the radial operation of Northern

Kerala (Maloperation: SPS acted during the switching off of ICT#2

for permit to work)

0

Sl. No. SPS (with logic) Total no. of Operations

1 SPS-1( 765 kV Solapur-Raichur D/C>2500 MW) Nil


1 TK-1 (Talcher – Kolar) 1

2 TK-3 (Talcher – Kolar) Nil


1 UPCL ICT SPS 1

Line flow Graphs

Figure-a1:

Figure-a2:

0

200

400

600

800

1000

1200

1400

1600

1800

2000

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

MW

% of Time

Load Duration Curve of 400kV Nellore PS-Nellore DC Line

OCT-2016 NOV-2016 DEC-2016

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

750

800

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

MW

% of Time

Load Duration Curve of 400kV Gooty - Nelamangala Line

OCT-2016 NOV-2016 DEC-2016

Figure-a2:

Figure-a3:

0

50

100

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200

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300

350

400

450

500

550

600

650

700

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

MW

% of Time

Load Duration Curve of 400kV Gooty - Somnahalli Line

OCT-2016 NOV-2016 DEC-2016

050

100150200250300350400450500550600650700750800850900950

10001050110011501200

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

MW

% of Time

Load Duration Curve of 400kV Udumalpet-Palakkad DC Line

OCT-2016 NOV-2016 DEC-2016

Figure-a4:

050

100150200250300350400450500550600650700750800850900950

10001050110011501200

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

MW

% of Time

Load Duration Curve of 400 kV Hiriyur-Nelamangala D/C Line

OCT-2016 NOV-2016 DEC-2016

ICT flow Graphs

Figure-b1:

Figure-b2:

0

50

100

150

200

250

300

350

400

450

500

550

600

650

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Gazuwaka ICTs Flow (2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

750

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Vemagiri ICTs Flow (2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N - 1 Contingency

Figure-b3:

Figure-b4:

050

100150200250300350400450500550600650700750800850900950

100010501100115012001250130013501400

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Nelamangala ICTs Flow (3x500 MVA)

OCT-2016 NOV-2016 DEC-2016

050

100150200250300350400450500550600650700750800850900950

10001050110011501200

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Somanahalli ICTs Flow (3x500 MVA)

OCT-2016 NOV-2016 DEC-2016

Figure-b5:

Figure-b6:

050

100150200250300350400450500550600650700750800850900950

100010501100115012001250130013501400

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Hoody ICTs Flow (3x500 MVA)OCT-2016 NOV-2016 DEC-2016

0

50

100

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300

350

400

450

500

550

600

650

700

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Guttur ICTs Flow(2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Violation

Figure-b7:

Figure-b8:

0

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100

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200

250

300

350

400

450

500

550

600

650

700

750

800

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Hiriyur ICTs Flow (2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

750

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Narendra ICTs Flow (2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

Figure-b9:

Figure-b10:

0

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100

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200

250

300

350

400

450

500

550

600

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/230kV Pugalur ICTs Flow(2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Violation

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

750

800

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/230kV Trichy ICTs Flow(2x315 MVA)OCT-2016 NOV-2016 DEC-2016

Figure-b11:

Figure-b12:

0

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300

350

400

450

500

550

600

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700

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/230kV Madurai ICTs Flow (2x315 MVA)OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

0

50

100

150

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250

300

350

400

450

500

550

600

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/230kV Thiruvallam ICTs Flow (2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

Figure – b13:

0

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400

450

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550

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700

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

MW

% of Time

Load Duration Curve of 400/220kV Kozhikode ICTs Flow(2x315 MVA)

OCT-2016 NOV-2016 DEC-2016

N-1 Contingency

Voltage Graphs

Figure-c1:

Figure-c2:

370

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395

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435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Somnahally Voltage

OCT-2016 NOV-2016 DEC-2016

350

355

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365

370

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385

390

395

400

405

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415

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Nelamangala Voltage

OCT-2016 NOV-2016 DEC-2016

Figure-c3:

Figure-c4:

370

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380

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390

395

400

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435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Hoody Voltage

OCT-2016 NOV-2016 DEC-2016

370

375

380

385

390

395

400

405

410

415

420

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430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Bidadi Voltage

OCT-2016 NOV-2016 DEC-2016

Figure-c5:

Figure-c6:

360

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Arasur VoltageOCT-2016 NOV-2016 DEC-2016

360

365

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395

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Trichur Voltage

OCT-2016 NOV-2016 DEC-2016

Figure-c7:

Figure-c8:

360

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400

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Palakkad VoltageOCT-2016 NOV-2016 DEC-2016

360

365

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Cochin VoltageOCT-2016 NOV-2016 DEC-2016

Figure-c9:

Figure-d1:

360

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400

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0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Trivendrum VoltageOCT-2016 NOV-2016 DEC-2016

400

405

410

415

420

425

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435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Vijayawada Voltage

OCT-2016 NOV-2016 DEC-2016

Figure-d2:

Figure-d3:

395

400

405

410

415

420

425

430

435

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Vemagiri VoltageOCT-2016 NOV-2016 DEC-2016

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Gooty VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d4:

Figure-d5:

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Kurnool Voltage

OCT-2016 NOV-2016 DEC-2016

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Nellore Pooling Station VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d6:

Figure-d7:

390

395

400

405

410

415

420

425

430

435

440

445

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Sattenapally Voltage

OCT-2016 NOV-2016 DEC-2016

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV VTPS - IV VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d8:

Figure-d9:

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Hyderabad Voltage

OCT-2016 NOV-2016 DEC-2016

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Mamidipalli VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d10:

Figure-d11:

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Srisailam LB VoltageOCT-2016 NOV-2016 DEC-2016

400

405

410

415

420

425

430

435

440

445

450

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Malkaram VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d12:

Figure-d13:

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Narendra VoltageOCT-2016 NOV-2016 DEC-2016

360

365

370

375

380

385

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Karaikudi VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d14:

Figure-d15:

380

385

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Pugalur VoltageOCT-2016 NOV-2016 DEC-2016

385

390

395

400

405

410

415

420

425

430

435

440

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 400 kV Sriperumbudur VoltageOCT-2016 NOV-2016 DEC-2016

Figure-d16:

Figure-d17:

740

745

750

755

760

765

770

775

780

785

790

795

800

805

810

815

820

825

830

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 765 kV Raichur VoltageOCT-2016 NOV-2016 DEC-2016

720

730

740

750

760

770

780

790

800

810

820

830

840

850

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 765 kV Kurnool Voltage

OCT-2016 NOV-2016 DEC-2016

Figure-d18:

750

760

770

780

790

800

810

820

830

840

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100%

KV

% of Time

Duration Curve of 765 kV Nellore Pooling Station VoltageOCT-2016 NOV-2016 DEC-2016

Figure-E1

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