Suo Motu Petition No. 191/2011. Case: In Re : NTPC Ltd. and Ors. Vs. Central Electricity Regulatory Commission

Case NumberSuo Motu Petition No. 191/2011
JudgesPramod Deo, Chairperson, S. Jayaraman, V.S. Verma and M. Deena Dayalan, Members
IssueElectricity Law
Judgement DateOctober 04, 2011
CourtCentral Electricity Regulatory Commission

Order:

  1. Regulation 5.2.(f) of the of the Central Electricity Regulatory Commission (Indian Electricity Grid Code) Regulations, 2010 (hearing after?Grid Code?) provides that all thermal generating units of 200 MW and above and all hydro units of 10 MW and above which are synchronized with the grid, irrespective of their ownership, shall be required to have their governors in operation at all time in accordance with the provisions in Sub-clauses (i) to (iii) of the said Regulation. The provisions of governor action is extracted as under:

    Governor Action

    i) Following Thermal and hydro (except those with upto three hours pondage) generating units shall be operated under restricted governor mode of operation with effect from the date given below:

    a) Thermal generating units of 200 MW and above,

    1) Software based Electro Hydraulic Governor (EHG)system: 01.08.2010

    2) Hardware based EHG system 01.08.2010

    b) Hydro units of 10 MW and above 01.08.2010

    ii) The restricted governor mode of operation shall essentially have the following features:

    a) There should not be any reduction in generation in case of improvement in grid frequency below 50.2 Hz. ( for example if grid frequency changes from 49.3 to 49.4 Hz. then there shall not be any reduction in generation). Whereas for any fall in grid frequency, generation from the unit should increase by 5% limited to 105 % of the MCR of the unit subject to machine capability.

    b) Ripple filter of +/- 0.03 Hz. shall be provided so that small changes in frequency are ignored for load correction, in order to prevent governor hunting.

    c) If any of these generating units is required to be operated without its governor in operation as specified above, the RLDC shall be immediately advised about the reason and duration of such operation. All governors shall have a droop setting of between 3% and 6%.

    d) After stablisation of frequency around 50 Hz, the CERC may review the above provision regarding the...

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