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Statement of System Performance

Ref - Paragraph 20.8 of Transmission and Bulk Supply License

A quarterly report on performance of the system, with reference to each standard shall be submitted to OERC within 25 days of end of each quarter i.e. by 25th of April, July, October and January each year. An annual report on the year ending 31st March shall be submitted by 25th April along with the report on the first quarter report. The report shall contain the following information.

A. Power Supply Security

  1. Percentage of time (total hours in the quarter) load-restrictions were applied due to non-availability of generation of Regional Pool Power.

  2. In each case, on daily basis, particulars of the generating station of Regional Pool, which failed to meet dispatch or forecasted requirement.

  3. In each case, the estimated amount of demand curtailed and areas or consumer categories which were affected.

B. Transmission Security

  1. Percentage of time (total hours in the quarter) load restrictions were applied, due to non-availability of transmission capacity, even though generation/Regional Pool capacity was available.

  2. Percentage of time (total hours in the quarter) generation had to be rescheduled, due to non-availability of transmission capacity, even though load restriction was not required.

  3. In each case the transmission element (e.g. line, transformer, circuit breaker etc.) which was not available, resulting in loss of transmission capacity. The reason for non-availability of the transmission element (e.g. scheduled maintenance outage, unscheduled maintenance outage, forced outage, with details) shall be furnished.

  4. In each case the Grid sub-station affected, the extent of generation rescheduling required, estimated capacity restriction effected, area/consumer categories affected.

C. Overall Performance

1) Frequency

  1. Percentage of time (total hours in the quarter), grid frequency was (i) above higher value permitted under IE Rules, 1956, (ii) below lower value permitted under IE Rule, 1956.

  2. The maximum continuous period of deviation, with date and time and reason for such continuous deviation.

  3. The highest and lowest grid frequency observed, value, time and date of occurrence. In case this was accompanied by islanding of the network, details of the event resulting in such islanding shall be furnished.

2) Voltage

  1. Percentage of time voltage at outgoing 33/11 kV lines of any grid sub-station was beyond levels permitted under IE Rules, 1956.

  2. In each case, reasons for such deviation, the Grid sub-station affected and maximum continuous period of deviation, with date and time to be reported.

  3. The highest voltage and the lowest voltage, if beyond limit permitted under IE Rules, 1956 with date and time and grid sub-station where it occurred shall be reported along with % tap position of the concerned Interconnecting transformer and Load transformer.