1. Reactive Power Management - Case study -- Nandan Pathak (AE)

2. ICT -1 ICT -2G-3G-4G-5 200 MW 160 MVAR 160 MW 135 MVAR 200 MW 160 MVAR 160 MW 135 MVAR 160 MW 140 MVAR LOAD 220 kV Girwali Bus 220 kV Parli Bus

3. ~ GENERATION 870 MW 730 MVAR LOAD: A ) GENERATORS: a) High MVAR drawl b) High excitation current B) ICT: a) Overloading due to MVAR b) Low voltage on 220 kV bus ( 200 kV)

4. C) LOAD: 11 kV side: a) Overload tripping b) Very low voltages c) Conductor snapping d) Local load shedding 440 V side: a) Failure of transformers b) Conductor snapping

5. A)High seasonal load especially agriculture during October to March B) Failure of reactive compensation

6. A)Identification of areas a) Beed district b) Solapur district c) Nanded district d) Pabhani district e) Latur district

7. A)Identification of radial feeders 220 kV Girwali Bus 220 kV Nanded 160 MW 100 MVAR 220 kV Parbhani 100 MW 80 MVAR 132 kV Parli Bus 132kV Beed 80 MW 60 MVAR ~ ~ 132 kV Latur -1 90 MW 75 MVAR 132 kV Latur -2 60 MW 45 MVAR 132 kV Girwali Bus On similar lines loaded 11 & 33 feeders were identified.

8. I) Reactive power compensation available : i. Substation ----- 164 MVAR ii. Switched capacitors on 11kV – 240 MVAR (0.6 X405) II) Focus Area – 11 kV, 0.6 MVAR capacitors a. Repairs in a central laboratory b. On site replacement, checking, modification, training

9. Modifications adopted for optimum compensation 1. Cell rating 0.66 Mvar at 12 kV 2. De-rating at Low Voltage 2. De-rating at Low Voltage 3. Modification 3. Modification A. Fixed capacitors A. Fixed capacitors B. Addition to basic scheme B. Addition to basic scheme

12. 4. On site demonstrations 5. Team visit – Nasik, Pune (R ), Kolhapur, Sangli,Parbhani

13. 1. Reduction in overload tripping of 11 kV & 33 kV feeders. 2. Reduction in blowing of HG fuses at 33/11 kV transformers. 3. Reduction in conductor snapping. 4. Improvement in voltage profiles LT 105 Volts to 190 volts LT 105 Volts to 190 volts 11kV7.6 kV to 9.8 kV 11kV7.6 kV to 9.8 kV

14. ICT -1 ICT -2G-3G-4G-5 250 MW (200) 100 MVAR(160) 200 MW(160) 60 MVAR(135) 250 MW(200) 100MVAR(160) 200 MW 60 MVAR 195 MW(150) 80 MVAR(140) LOAD 220 kV Girwali Bus 220 kV Parli Bus

15. ~ GENERATION 1095 MW (870) 400 MVAR (730) LOAD: Voltage changes: 220 kV 215 kV (200 kV) 132 kV 125 kV (106 kV) 33 kV 31 kV (27 kV)

16. Radial load changes 132 kV Parli Bus 132kV Beed 95 MW 30 MVAR (80 MW 60 MVAR) ~ ~ 132 kV Latur –1 105 MW 40 MVAR (90 MW 75 MVAR) 132 kV Latur –2 70 MW 30 MVAR (60 MW 45 MVAR) 132 kV Girwali Bus

17. MONTHKWH 1998KWH 1999KWH 2000KWH 2001 January79150011011001014800401700 February545000938100699100239400 March667900819800663300*262200 April53940079090087400*183400 May512000473200-*275400 June164400*459800167700*43800** July313900 1170300  442100 August310400 948000  490900 September330600630400342700 October500300706100350100 November530400854700626000 December307300*1104100542000 ---Load shifted to another feeder  --- Load of other feeder taken on this feeder ** --- kWh meter stopped due to leading PF Note: 0.6 MVAR capacitor bank recommissioned at village Pandharee on Dt.28.11.2000 0.6 MVAR capacitor bank added at same location on Dt.4.12.2000 New 0.6 MVAR capacitor bank commissioned at Pokharni Phata on Dt.8.12.2000 KWH recorded on 11kV Matkuli feeder from 132 / 11 kV T/F at 132 kV Ashti substation

19. MonthForecasted Energy sent out (kWH) Actual Energy sent out (kWH) Savings (kWH) Remark Dec 2000689997542000147997 21.45  Jan 2001624172401700222472 35.60  Feb 2001520905239400281505 54.00  Mar 2001562029265200296829 52.00  Apr 2001511766183400328366 64.10  May 2001451451275400176051 39.00  Total336032019071001453220 43.24  Energy savings on 11 kV Matkuli feeder

20. 1.System requires high order reactive compensation. 2.Use of fixed value non switched/seasonal manual switched capacitors is economical. 3. Complementary switching for optimum compensation. 4. Dedicated setup for overall line loss reduction.