The amended status of SBD

The current status of SBD

ITB Clause

The SLDs of the substations will be shared with all bidders.

The SLDs is Attached to this file.

The SLDs wasn't in the shared Data

Techniacl Specification annex No 1

Clarification

Question

No

The tender documents do not provide soil investigation data for the transmission line route or tower foundations, as these investigations are part of the Design-Build Contractor’s scope of work. The successful Contractor will be responsible for carrying out detailed geotechnical surveys, including soil resistivity tests, tower foundation investigations, and substation geotechnical studies, in accordance with IEC and international best practices.
Regarding the site visit:

The Employer will facilitate pre-bid site visits for interested bidders to the proposed transmission line corridor and substation locations. The purpose of the site visit is to provide bidders with an opportunity to familiarize themselves with the general conditions, accessibility, and terrain.
Any specific technical investigations (such as soil testing, topographic survey, or hydrological studies) shall be conducted by the successful Contractor after contract award.

Based on the tender document, soil investigation of transmission line path and location of towers are not specified. Would you please coordinate site vist for both TL and Substations in order to clarify technical question?

The land acquisition process and associated costs for HV substations and transmission line routes will be the responsibility of the Client. In case of delays related to land acquisition, the Contractor will be granted a time extension to the project schedule in accordance with the contract provisions.

Is the process and the cost of the land acquisition of HV substations and transmission lines bourne by contractor or by client? Because the lands may have private owner. Please clarify land acquisition is bourne by client and delays regarding to that will be added to project duration.

Single Busbar.

The scheme of substations are not specified in the tender document. Are they Single Busbar, 1.5 CB scheme or double busbar?

Yes, the ToR indicates that each 220 kV substation shall have one additional connection point reserved for future interconnection on the busbar. Any further extensions beyond this provision are not included in the current scope and will be considered separately by the Client if required in the future.

Is there any probable future extension in the scope of work for substations?

No

Is there any approved vendor list for procurement of equipment, cement, or other building material?

No

Do you have any sub-vendor preference in technical evaluation of the tender? How do you weight them in the technical evaluation?

The codes and standards to be used for this project are already specified in the ToR. In the absence of such national standards, internationally recognized standards such as IEC (or equivalent) shall be followed, subject to the Client’s approval.

Is there any national code and standards by Ministry of Energy and Water that should be followed by the contractor? Or international IEC code is acceptable?

As per Section 14.2 of the ToR, the payment breakdown is fixed as indicated. Advance payment for the procurement stage is not foreseen in the current payment schedule. However, any modification to the payment terms would be subject to Client’s discretion and formal agreement during contract negotiations.

In the section 14.2 Payment Breakdown of ToR, 10% considered for “Mobilization, Survey and Design Complete”, and 30% After Completion of procurement. Could the client consider Advance payment for procurement stage?

Payments will be processed within thirty (30) days after the submission and completion of the required documents by the Contractor. In case of any delay in payments by the Client, no additional compensation or penalty shall be paid to the Contractor for such delay.

How many days does it take for payment of invoices during the project (legal duration)? And how the client’s delay will be calculated and covered?

Pul-e-khorasan substation is AIS and regarding general single line drawings MEW will share it.  

Would you please submit Pul-e-khorasan substation general single line drawings? Is it AIS or GIS?

The substations under this project will be equipped with a Digital Control System (DCS/SCADA based) in line with modern design and operation requirements. Conventional control systems are not included in the scope. Detailed specifications will be finalized during the design stage and shall comply with IEC standards.

Would you please specify the control system of each substation? Is it Conventional of DCS?

It is AIS.

What is the Insulation form of QUSH TEPA & Darzaab substations? Is it AIS or GIS?

The exact route lengths for 11 kV and 0.4 kV distribution lines will be determined during the detailed survey and design phase, which is the Contractor’s responsibility under the Scope of Work.

Please specify the total length by voltage level: 11 kV and 0.4 kV (pricing differs by voltage(.

According to scope of project only two new substations will be established to ensure efficient power transformation and distribution:

• One 20 MVA (2×10 MVA) substation in Qush Tepa District
• One 32 MVA (2×16 MVA) substation in Darzaab District

No new extra high-voltage substations are included in this Scope of Work of the project.

Are any substations required? If yes, please indicate the number, location(s), and rated capacity

The type and material of poles are already defined in the ToR:

• Transmission lines: Steel towers
• Distribution lines: Concrete poles

Standard heights and loading class will be finalized by the Contractor during the detailed design stage under the design-build scope.

Specify the type and material of poles (e.g., RCC/PSC, steel, wooden), standard heights, and loading class.

These details will be finalized during the detailed design stage by the Contractor, in compliance with international standards and subject to the Client’s approval.

If Distribution Transformers are to be installed on poles, specify the ratings, mounting arrangement (single/double pole with cross-arm/bracing), and required accessories (LV/H protection, surge arresters, isolation, earthing, fencing).

The conductor type is already specified in the ToR.

For a 220 kV transmission line, which type of conductor should be used?

The requirement of capacitor banks is not included in the current project scope. If later deemed necessary, instructions will be issued separately by the Client.

Are capacitor banks required for the substations?

Yes

Is demining required?

Estimated population:

• Qush Tepa District: ~28,184 persons
• Darzaab District: ~59,672 persons

The number of houses to be electrified will be determined during the detailed survey and design stage.

The required substations are already specified in the ToR

Regarding the distribution lines, how many houses are to be electrified, and could you please provide the tentative population details? Are any substations required? If yes, please indicate the number, location(s), and rated capacity

1. Siemens

2. It is IEC compliant

3. Yes, brand/model will share later for design. 

4. To existing Busbar protection

1. Protection System and Relays

1. What are the existing relay brands a and models installed in Pul-e-Khorasan Substation

(Siemens, ABB, GE, SEL, or others)?

2. Are the existing relays IEC 61850 compliant or conventional hardwired type?

3. Is there an existing Busbar Protection Scheme? If yes, what is the brand/model?

4. Should the new bay be integrated into the existing Busbar protection, or should a separate relay be installed?

1. Both SAS and Conventional mimic panels are used in Pul-e-Khorasan Substation. 

2. Siemens

3. Both local HMI workstation available and RTU Connection to the National SCADA

4. It will be specified during detail design of project.

2. Control and Automation System

1. Is Pul-e-Khorasan Substation equipped with a Substation Automation System (SAS) or conventional mimic panels.

2. If SAS exists, what is the brand/platform (Siemens SICAM, ABB Micro SCADA, GE, Schneider, etc.)?

3. Is there a local HMI workstation available or only RTU connection to the National

SCADA (NLCC)?

4. What communication protocols are currently used (IEC 61850, IEC 60870-5-104, DNP3, Modbus, etc.)?

1. Should be integrated into the existing SAS/RTU

2. It will be later share with successful bidder.

3. Yes, It should be integrated and interface with the existing busbar protection and SCADA system.

3. Integration with New Line Bay

1. Should the new line bay relays and BCUs (if any) be integrated into the existing SAS/RTU, or installed as a standalone system?

2. What are the integration requirements with NLCC (SCADA)?

3. Does the Employer require the new bay relays to match the brand of the existing relays?

1. During the design all As-Built drawings will be shared with the successful bidder.

2. There is sufficient space for new line bay and the control cabling is required for the new line bay.

3. DC Auxiliary Supply voltage in the existing substation 220VDC and for SCADA it is 48VDC

4. General Information

1. Will the Employer provide As-Built drawings of the existing Pul-e-Khorasan Substation?

2. Is there sufficient control room space and cabling provision for the new line bay or expansion required?

3. What is the DC Auxiliary Supply voltage in the existing substation (48VDC, 110VDC, 220VDC)? Is the capacity sufficient for the new bay?

The exact lengths of the 20 kV and 0.4 kV distribution networks are not explicitly defined in the tender documents, as they will be determined during the detailed survey and design phase. Under the design-build scope of work, it is the Contractor’s responsibility to carry out the survey, prepare the detailed design, and establish the precise route lengths for both 20 kV and 0.4kV lines.

Following to our previous letters. Since the length of distribution lines is not explicitly mention in the tender document, it is appreciated if you let us know the total length of distribution network