Terms of Reference (TOR) For the Consultant to Analytically Evaluate Transmission and
Transformation (T&T) Losses of National Transmission & Despatch Co. Ltd. (NTDCL) Transmission
System Network of FY 2011-12 and 2012-13
Scope of Work
Consultant will perform the following activities to the satisfaction of NTDCL and NEPRA;
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Review and validation of all the data provided by NTDCL.
Modeling and simulation of 24 no. matched power flow cases of peak and off-peak scenario for FY 2011-12 and
2012-13 by using PSS/E (preferably version 32 or advanced).
Matched cases should include modeling of 500 kV and 220 kV transmission network with 500/220 kV and
220/132 kV power transformers.
All the data of power system components like generators, transmission lines, power transformers, shunt
reactors etc should be modeled properly in the matched cases. No load and Full load losses of transformer
should be entered correctly. Appropriate techniques should be adopted for taking into account transmission
line losses due to ageing.
Lumped load modeling at 132 kV bus bar should be performed.
Modeling of split bus bars should be performed as per operating scenario of GSO/NPCC.
Modeling of generation dispatch should be performed with respect to split generation at different
interconnection voltage levels, where applicable.
For each matched case, recorded system parameters such as power flows on transmission lines and
transformers, voltage profile on substation buses, generation dispatch etc should be matched exactly in power
flow study cases simulated through PSS/E.
Losses (MW) in the network should be assessed from the two simulated/matched cases for each particular
month (peak and off-peak). This assessed loss should be for the peak and off-peak condition of particular
month.
Losses (MW) for all the months of FY 2011-12 and 2012-13 should be assessed from the matched power flow
cases through simulation.
Evaluation of corona, dielectric and any other losses associated with the network.
The %age losses of NTDCL network for FY 2011-12 and 2012-13 should be assessed by either developing loss
curve through curve fitting technique and estimation of energy loss using area under the curve method or by
any other appropriate technique.
Presentation of work done to NTDCL and NEPRA.
Additional Services
Any Services which are not specifically mentioned in the TOR above, but are allied and essential for the effective
implementation and completion of the project will also be provided by the Consultants and will be deemed to have been
part of this TOR. However this will not include services for any additional scope of work.
Reporting Requirement
Reports to be submitted by the Consultants to NTDCL as a part of consultancy services will include the following:
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Monthly progress report
All Deliverables and studies of the project
Draft Study Report
Final Study Report after incorporating the comments