Comments on Telecom Equipment by NTDC (Telecom) Dated: 24-03-2015 1. Telecom System Architecture & Network Diagram I. The distance between Metro Wind Farm and remote substation-2 is <10 km therefore Power Line Carrier along with outdoor coupling will not be installed on 132kV line-2. MPCL Response: As per the instruction by NTDC (System Protection, letter is attached) , we are providing differential relay with distance protection function which can operate through OPGW and as well as through DPLC. Furthermore, DPLC shall be used for communication purpose with NPCC through Far end substation as required under clause 15 of Schedule 2 page 2-12 of EPA which states as follows: “DPLC shall be the primary medium of communication between the Complex and NPCC Islamabad through new 132 kV NTDC/HESCO grid station ("Grid Station") as well as adjacent Wind Power Project ("WPP") while backup communication medium shall be a satellite link between Complex and NPCC Islamabad for the purpose of data, voice and fax Communication to be provided by the Seller at the Complex.” Therefore, DPLC with outdoor coupling will be required for both lines. II. 132kV line-2 shall be protected by differential relay operating through OPGW which is to be provided by NTDC. MPCL Response: We are already providing differential relay with distance function as per the instruction of NTDC (System Protection) which can operate through OPGW and as well as through DPLC. III. For the protection of 132kV line-1 differential relay is shown on the drawing which does not conform to 15(b), schedule # 2 of EPA.

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Comments on Telecom Equipment by NTDC (Telecom) Dated: 24-03-20151. Telecom System Architecture & Network Diagram

I. The distance between Metro Wind Farm and remote substation-2 is 10 KM.

IV. Since the distance between Metro Wind Farm and remote substation-1 is >10km therefore Distance protection will be used. DPLC shall be used for inter-tripping of circuit breaker at both ends of 132kV Transmission line.

MPCL Response:As mentioned above, because of the instruction of NTDC (System Protection), differential relay with distance function has also been provided for line -1 having length > 10 KM, which can operate through OPGW and as well as through DPLC.

V. R, S, T is shown on the drawing, it should be R, Y, and B. Clarification is required.MPCL Response:Noted and shall be incorporated.

VI. Interconnection schemes for power Evacuation indicates that one circuit will be IN/OUT at UEPL, whereas in drawing it is not shown. Clarification is required.MPCL Response:We have not provided interconnection scheme for Power Evacuation by NTDC therefore, it is not shown in drawing. We have already write a request letter to CPPA for Far End Grid via a letter ..

2. Telecom System Base DesignPower Line CarrierOffered PLC MiCOM T-390 is already installed in NTDC, Telecom network and technical data conform to Telecom NTDC specifications. However, according to field information working of PLC MiCOM T-390 is not satisfactory.MPCL Response:Offered PLC MiCOM T-390 is already installed in NTDC, Telecom network and has been accepted by NTDC as evident from various FAT certificates and letter from CE Tel NTDC attached herewith.Digital PABXI. Specific works data is missing. Only brochure is attached.MPCL Response:Technical Data is given in the base design in sufficient detail. Specific Works Data format is not specified in EPA.

II. Reference list in power utility network is missing.MPCL Response:Proposed PABX is extensively used in NTDC system. List of other users will be supplied subsequently.

III. Complete type test report is missing.MPCL Response:In view of extensive use of the proposed PABX in NTDC system, its acceptance in FAT by NTDC as evident from attached FAT reports, the submitted type test report can be deemed to be sufficient.

IV. Offered PABX IS 3000 is already installed in NTDC, Telecom network. According to field information working of PABX IS 3000 is not satisfactory.MPCL Response:Offered PABX IS3000 is already installed in NTDC, Telecom network and has been accepted by NTDC as evident from various FAT certificates.DIP 5000 Protection EquipmentThe technical data is provided is devoid of essential detail technical specification.As far as LMU is concerned, it is strongly advised that Tele protection equipment, outdoor coupling equipment, and Digital PLC should be of same manufacturer to avoid mismatching and compatibility issues.MPCL Response:Technical Data is given in the base design in sufficient detail. Kindly specify exact requirement.The proposed DPLC and LMU are of Alstom make.

3. OVERALL SLDI. The distance between Metro wind farm and remote substation-2 is