UFRs and df/dt are envisaged to take care of sudden contingencies arising out of outage of generation stations or separation of inter regional lines. UFRs setting are for steady state operation of the Grid at considerably low frequency and df/dt settings are for dynamic change change when frequency falls suddenly with jerks.
The existing settings of UFRs are 49.2 Hz , 49.0 Hz 48.8 Hz and 48.6 Hz with the following State wise load relief :
| 1 | 2 Load relief in MW
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|---|
| STATES | Peak MW Met 2012-13 | 49.2 Hz | 49.0. Hz | 48.8 Hz | 48.6 Hz | TOTAL
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|---|
| Punjab | 8751 | 400 | 402 | 406 | 408 |
| | Haryana | 6725 | 308 | 309 | 312 | 314 |
| | Rajasthan | 8515 | 390 | 392 | 395 | 397 |
| | Delhi | 5642 | 258 | 259 | 262 | 263 |
| | UP | 12048 | 551 | 554 | 559 | 561 |
| | Uttarakhand | 1674 | 77 | 77 | 78 | 78 |
| | HP | 1672 | 77 | 77 | 78 | 78 |
| | J & K | 1817 | 83 | 84 | 84 | 85 |
| | Chandigarh | 340 | 16 | 16 | 16 | 16 |
| | TOTAL | 47184 | 2160 | 2170 | 2190 | 2200 |
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