THE RPUF SCHEME KHAMMAM VIJAYAWADA NAGARJUNASAGAR HYDERABAD RAICHUR GOOTY HOODY SALEM UDUMALPET TRICHUR MADURAI TRICHY MADRAS NEYVELI CUDDAPAH DAVANAGERE KAIGA 115 317 RSTPP BHADRAVATI 130x2 164x2 182 151 181 173 302 308 172 277 279 155 178x2 BANGALORE SIRSI MUNIRABAD P N JEYPORE 63 187 2x221 54 Kadra Kodasally Nagjhari 1 120 60 MAPS NELLORE By Tripping of Salem-Bangalore and Cudddapah-Madras Southern Grid was getting devided into two blocks NELAMANGALA GAZUWAKA HIRIYUR 189 267x2 258 242 175 179 127 221x2 146x2 52x2 301x2 300 28 330 FIG-2 THE SR GRID IN 1996

THE FIRST SCHEME: 1996 CONDITIONS Line Name Frequency Below (Hz) POWER FLOW(MW) Time delay (second) Type of Relay CUDAPPA-MADRAS 47.8 0.5 UF SALEM- BANGALORE 1 48.0 100 MW towards CUDAPPA RPUF 300 MW towards BANGALORE

14 – 12 -1994 1538 HRS 20 280 60 60 340 110 SEBS SHARES CGS RELIEF THE SR GRID IN 1996 14 – 12 -1994 1538 HRS SEBS SHARES APSEB 750 MW KEB 522 MW KSEB 392 MW TNEB 988 MW BHADRAVATI 178x2 CGS RELIEF NTPC 1820 MW MAPS 260 MW NLC II 640 MW 267x2 187 1 RSTPP 155 2x221 P 189 301x2 279 GAZUWAKA P P HYDERABAD P KHAMMAM 277 317 P 258 P 221x2 115 VIJAYAWADA Nagjhari RAICHUR 1538 HRS GOOTY VOLTAGE DIPPED FROM 300 KV TO 250 KV.AFTER AP SHEDDING LOAD VOLTAGEIMPROVED TO 290 KV. MUNIRABAD 120 172 302 NAGARJUNASAGAR 146x2 Kodasally 308 P N P 20 52x2 KAIGA SIRSI 280 GOOTY P 60 NELLORE 60 CUDDAPAH Kadra DAVANAGERE 173 300 60 HIRIYUR 340 242 NELAMANGALA 300 182 BANGALORE P 181 P 330 MAPS HOODY 28 110 MADRAS 260 151 63 175 1630 HRS SOMANHALLY REPORTED DIP IN GOOTY VOLTAGE TO 265 KV AT 1615 HRS. REDUCTION IN TN DRAWAL ON CDP –MAS AND SLM-BNG, GOOTY VOLTAGE IMPROVED. P 54 164x2 SALEM 179 NEYVELI P UDUMALPET 130x2 P P TRICHY 130x2 TRICHUR 127 P MADURAI FIG-2

10 – 12 -1994 60 300 60 90 250 CGS RELIEF NTPC 1780 MW MAPS 280 MW NLC II 830 MW THE SR GRID IN 1996 10 – 12 -1994 BHADRAVATI 178x2 267x2 187 RSTPP 1 155 2x221 189 301x2 P 279 GAZUWAKA P P HYDERABAD P KHAMMAM 277 317 P 258 P 221x2 115 VIJAYAWADA Nagjhari 0730 HRS CDP – BNG 330 MW -60 MVAR GTY – BNG 300 MW -60 MVAR SLM – BNG -90 MW 250 MVAR RAICHUR MUNIRABAD 120 172 302 NAGARJUNASAGAR 146x2 Kodasally 308 P N P 60 52x2 KAIGA SIRSI 300 GOOTY P NELLORE 60 CUDDAPAH Kadra DAVANAGERE 173 330 60 242 HIRIYUR NELAMANGALA 300 182 BANGALORE P 181 P 330 MAPS HOODY 28 90 MADRAS 250 151 63 175 AS THE VOLTAGES ARE LOW, AP HAS BEEN ASKED TO PUT N’SAGAR MACHINES TO CONVERT IN CONDENSER MODE. P 54 164x2 SALEM 179 NEYVELI P UDUMALPET 130x2 P P TRICHY TRICHUR 127 130x2 P MADURAI FIG-2

23 – 07 -1995 160 105 215 FLOWS CGS RELIEF NTPC 900 MW MAPS 145 MW NLC II 960 MW SEBS SHARES APSEB 628 MW KEB 392 MW KSEB 260 MW TNEB 788 MW THE SR GRID IN 1996 23 – 07 -1995 BHADRAVATI 178x2 267x2 187 RSTPP 1 155 2x221 P 189 301x2 279 GAZUWAKA P P HYDERABAD P KHAMMAM 277 317 P 258 P 221x2 115 VIJAYAWADA Nagjhari RAICHUR FLOWS MUNIRABAD 120 172 302 NAGARJUNASAGAR 146x2 Kodasally 308 P N P 52x2 TIME CDP-BNG CDP-MAS SLM-BNG 0900 HRS 160 MW 105 MW 215 MW 0930 HRS 140 MW 072 MW 245 MW 1100 HRS 135 MW 035 MW 250 MW 1135 HRS 260 MW KAIGA SIRSI GOOTY P NELLORE CUDDAPAH Kadra DAVANAGERE 173 160 60 242 HIRIYUR 105 NELAMANGALA 300 182 BANGALORE P 181 P 330 MAPS HOODY 28 215 MADRAS 151 63 TRIPPING OF THE LINE WHEN > 300 MW 175 P 54 164x2 SALEM 179 NEYVELI P UDUMALPET 130x2 P P TRICHY 130x2 TRICHUR 127 P MADURAI FIG-2

As THE SALEM – BANGALORE FLOW IS INCREASING , BECAUSE OF RPUF RELAY SETTING AT 300 MW, SRLDC ISSUED MESSAGES TO AP, KAR. AT THE ABOVE INSTANCE OD/UD AP +92 MW KAR +25 MW KER -71 MW TN -47 MW

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23 – 07 -1995 105 215 0900 HRS CDP – BNG 160 MW CDP – MAS 105 MW THE SR GRID IN 1996 23 – 07 -1995 0900 HRS CDP – BNG 160 MW CDP – MAS 105 MW SLM – BNG 215 MW BHADRAVATI 178x2 267x2 187 1 RSTPP 155 2x221 189 301x2 P 279 GAZUWAKA P P HYDERABAD P KHAMMAM 277 317 P 0930 HRS CDP – BNG 140 MW CDP – MAS 072 MW SLM – BNG 245 MW 258 P 221x2 115 VIJAYAWADA Nagjhari RAICHUR MUNIRABAD 120 172 302 NAGARJUNASAGAR 146x2 Kodasally 308 P N P 52x2 KAIGA SIRSI GOOTY P NELLORE CUDDAPAH Kadra DAVANAGERE 173 160 60 105 242 HIRIYUR NELAMANGALA 300 182 BANGALORE P 181 P 330 MAPS 1100 HRS CDP – BNG 135 MW CDP – MAS 035 MW SLM – BNG 250 MW HOODY 28 215 MADRAS 151 63 175 P 54 164x2 SALEM 179 NEYVELI 1135 HRS CDP – BNG 135 MW CDP – MAS 035 MW SLM – BNG 260 MW P UDUMALPET 130x2 P P TRICHY TRICHUR 127 130x2 P MADURAI FIG-2

As THE SALEM – BANGALORE FLOW IS INCREASING , BECAUSE OF RPUF RELAY SETTING AT 300 MW, SRLDC ISSUED MESSAGES TO AP, KAR. AT THE ABOVE INSTANCE OD/UD AP +92 MW KAR +25 MW KER -71 MW TN -47 MW

14 – 12 -1994 20 280 60 60 340 110 CGS RELIEF NTPC 1820 MW MAPS 260 MW NLC II 640 MW THE SR GRID IN 1996 14 – 12 -1994 BHADRAVATI 178x2 267x2 187 1 RSTPP 155 2x221 301x2 P 189 279 GAZUWAKA P P HYDERABAD P KHAMMAM 277 317 P SEBS SHARES APSEB 750 MW KEB 522 MW KSEB 392 MW TNEB 988 MW 258 P 221x2 115 VIJAYAWADA Nagjhari RAICHUR MUNIRABAD 120 172 302 NAGARJUNASAGAR 146x2 Kodasally 308 P N P 20 52x2 KAIGA SIRSI 280 GOOTY P 60 NELLORE 60 CUDDAPAH Kadra DAVANAGERE 173 300 60 HIRIYUR 340 242 NELAMANGALA 300 182 BANGALORE P 181 P 330 MAPS HOODY 28 110 MADRAS 260 151 63 175 1404 HRS CDP – BNG 300 MW -20 MVAR GTY – BNG 280 MW -60 MVAR SLM – BNG -110 MW 260 MVAR CDP – MAS 340 MW -60 MVAR P 54 164x2 SALEM 179 NEYVELI P UDUMALPET 130x2 P P TRICHY 127 130x2 TRICHUR P MADURAI FIG-2