content in bidding si reference document clarifications requested...

Si ReferenceContent in Bidding

DocumentClarifications Requested Answer

1

Schedule No. 1

1.4.1.1.5 LV/33

Substation, related

accessories and 33

kV evacuation line

in Section 6

& Section – 4 Page

48 of 56

Conflicted requirement of Capacity of 33/0.40

kV auxiliary transformer

(100KVA?150KVA?200KVA)

Please confirm the Capacity of Auxiliary Transformer.

2 X 100 kVA. Or bidder can

suggest but total kVA rating

should be higher than 200

kVA

2Annex A - 02 PV

Plant LayoutCluster information Is the bidder allowed to change the model capacity of single panel and inverter?

Yes. Inverter (25-60)KW and

module efficiency must be

equal to or higher than 16.5%

and must be greater than or

equals to 320WP in capacity

3

2.4.1.1.5 LV/33

Substation, related

accessories and 33

kV evacuation line

Section – 6 , Page

23 of 81 &

2.7 Subcontractors

Step-

upTransformers,250

0 kVA

Section – 3, 0

of 11&

Form ELI - 3:

Mandatory

Compliance

TransformerLV/M

V

Section – 4, Page 34

of 56

LT Switch Gear:(For 2500 KVA Transformer)

Must have at least 2 (two) years

reliableoperating history of the proposed

model.

must have at least 5(five) years

reliableoperating history ofthe

proposedtransformer model

1. 2500KVA Transformer is comparatively new product and could be impossible to satisfy 5

years operation history requirement. Is the bidder allowed to lower the capacity?

2. We would propose to change the operating history to be 2 years rather than 5. Please confirm.

Manufacturer needs to have 5 yrs experience but the model should have 2 yrs operating

experience.

Manufacturing Experience of 5

years and 2years of successful

field experience for the offered

model

4

Annex B - 01 Single

Line Diagram of the

Plant&

2.4.1.2 Delivery

station


of 81

The proposed 33 kV switchgear is a double

bus bar system

Is Single bus bar sectionalized configuration acceptable? This design will serve the same purpose

and saves cost.

We prefer double bus

system.

5

22.2.7 Health and

Safety


of 5

The program shall also include provision of a

detailed cost estimate with supporting

documentation. Payment to the Contractor for

preparation and implementation this program

shall not exceed the Provisional Sum dedicated

for this purpose.

Please confirm the Provisional Sum dedicated for this purpose.

There is no provisional fund to

conduct the program. Bidder

will carry out in his own cost.

6

7

Submission and

Opening of Bids


of 3

The deadline for bid submission is Date &

Time: 24-07-2017, Time: 11:00 AM (BST)The bidder request to extend the deadline for bid submission.

Yes , 21 days has been

extended. New deadline of the

submission of bids is 17th

August, 2017 Thursday at 4.00

PM (BST)

8

2.4.1.1.7 Power and

control cables

Section – 6, 8

of 81

2.4.1.1.5 LV/33

Substation, related

accessories and 33

kV evacuation line


of 81

The 33 kV devices and 33 kV Evacuation line

shall be designed to withstand the energy

evacuation through one feeder at PV Plant’s

maximum rating.

10KM From Power Plant supply

switchyard to Kaliganj Substation receiving

switchyard ( 15M SPC （SPUN PRE-

STRESSED CONCRETE）POLE with

Double circuit Grosbeak conductor complete

with required accessories as per BPDB

Standard, pole muffling is required for each

poles).

1. Large section is required to evacuate Plant’s maximum rating if Grosbeak conductor is to be

used; Is the aluminum conductor with reinforced core of carbon fiber(ACCC), which has bigger

evaluation capacity, allowed instead?

2. Is the bidder allowed to used steel tower instead of SPC Poles?

1. Conductor should be

grossbeak 2. ( 15M SPC

（SPUN PRE-STRESSED

CONCRETE）POLE with

Double circuit Grosbeak

conductor complete with

required accessories as per

BPDB Standard, pole muffling

is required for each poles).

9

Construction

Schedule


of 56

&

Time Schedule

Section – 4, 1

of 56

Construction Schedule:

Work Plan. Propose the main assignment

activities, their content and duration, phasing

and interrelations, milestones, and delivery

dates for there ports. The proposed work plan

should be consistent with the technical

approach and methodology, showing

understanding of the TOR and ability to

translate them into a feasible working plan.

Include a list of the final documents, including

reports, drawings, and tables to be delivered as

final output. Construction schedule shall be

consistent with mobilization schedule.

Time Schedule (Bidder should supply)

As an experience contractor, we understand that Time Schedule is to be used by Bidder when

alternative Time for Completion is invited (usually not, as in the case of this project), like the

bidding documents of BPDB Kaptai 7.4MW solar project. In fact, all milestone dates will be

provided in construction schedule.

Please clarify in view of the construction schedule, shall the bidder fill out the Time Schedule. If

yes, what information shall the bidder provide in the Time Schedule?

Bidder can propose their own

time schedule & Milestone but

bidder should satisfy project

completeion schedules.

10Section 6 (ERQ)

ISPL

The installed capacity shall be equal or higher

than 40MWp. The PV plant will consist of the

deployment of higher efficiency PV generation

technology and three phase string inverters.

Cosnidering the wind speed, Is the bidder allowed to bid with central inverters or it needs to bid

with string inverters only?

Only String Inverter (25KW -

60KW )

11Section 6 (ERQ)

ISPL

Metallic and non-metallic materials shall be

UV resistantUV resistant property will be applicable to selected exposed equipment only. ok

12Section 6 (ERQ)

ISPL

Tariff metering shall be at the HT side of the

transformer and inside control room building

Tariff meter at HT side of Transformer but place inside the control building may increase the

burden on CT/PT and hence recommended to place at the switchyard. Please confirm.

Outdoor Tariff meter. But

another meter should be at the

control room.

13Section 6 (ERQ)

ISPL

For O&M purposes at 33 kV switchgear in

Delivery Station and in auxiliary system

(operational metering).

Please elaborate the requirement. Please specify the question

14Section 6 (ERQ)

ISPL

For the oil type transformers the following

temperature rise shall not be exceeded:

maximum oil temperature 60 ºC

average winding temperature: 65 ºC

Standard industry practice for temp rise over ambient:

maximum oil temperature 50 ºC

average winding temperature: 55 ºC

Please confirm if acceptable.

As per bid document

15Section 6 (ERQ)

ISPL

Buchholz relay with alarm and tripping

contacts. Pipes connecting the Buchholz relay

with tank and oil conservator to have slide

check valves to enable dismantling of the relay.

Bucholz Relay is applicable to transformer greater than 500kVA. Sl, if ratings crosses 500kVA,

shall provide else not. Please confirmOk. Ignore this clause.

16Section 6 (ERQ)

ISPLGeneral Bidder proposes to use distributed auxiliary system. Please confirm!!

Ok. But in this case Bidder

needs to provide Justification

and the total capacity should

not be less than 200 kVA.

17Section 6 (ERQ)

ISPL

PV Plant Control and monitoring system and

performance calculation (in case of central

inverters)

Bidder propsoes to use Zone monitoring (if Central inverters are acceptable). Please confirm

Central Inverter is not

applicable

18Section 6 (ERQ)

ISPL

The settlement meter (bidirectional) will be

located at the evacuation switchyard.

The Bidder has to provide the bidirectional

operational meter located in the PV Plant

Delivery Station according to the national

regulations and norms

Please confirm between point number 2.4.1.2.1 and 2.4.3.8. Bidder understands that there will be

one tariff meter with main & check meters and the same shall be installed at the HT side of

Power Transformer located at switchyard. Please confirm. Delivery stations will have MFM

(Multi function Meters)

Please see the Extract of PPA

(Metering). Bidders need to

comply with the PPA clause.

19Section 6 (ERQ)

ISPLGeneral Please share the latest grid code Attached

20Section 6 (ERQ)

ISPLGeneral

Kindly confirm grid reactive power requirement. If reactive power compensation not required

then the active power shall drop during reactive power requirement from grid. Please confirm?

According to the PPA, No

reactive power is required.

21 Drawings GeneralAssuming the prosed tilt angle and layout are indicative. Bidder is free to optimize and design.

Please confirm?

Confirmed. If alternate design

is proposed then Justification

need to be provided with

simulated yield calculation.

22Section 6 (ERQ)

ISPLGeneral Bidder is free to choose the DC/AC ratio? No. Cumulative AC power of

the Inverters over PV plant

capacity in Wp at STC must be

greater than or equals to 85%.

23Section 6 (ERQ)

ISPLTransmission Interconnection Is it under bidder's scope. ROW shall not be in bidder's scope. Please confirm

Bidder will identify the line

route along with employer and

employer will organize the right

of way. The evacuation line

should not be more than 10

kM.

24Section 6 (ERQ)

ISPLTransmission Interconnection Is there a bay extension work in the connecting subststaion?

Bidders Scope

25Section 6 (ERQ)

ISPLTransmission Interconnection

If bay extension is under the scope of bidder then the connecting substaion equipment

specification is needed. Kindly share the same?

Bidders Scope. For further

specification, you are requested

to visit the site along with

substation.

26Section 6 (ERQ)

ISPLTransmission Interconnection

If bay extension is under the bidder scope, then please confirm that land is abvalable for the

same. If not, land procurement shall not be in bidder's scope. Please confirm

If it is necessary to procure

land, Employer will do that.

But bidders will responsible for

the bay extension & rest of the

works.

27Section 6 (ERQ)

ISPL5kWp Solar PV (Roof Top)

Is it to be included in the total grid connected capacity or it is completely separate?? Please

cofirrm

Completely Separate.

28Section 6 (ERQ)

ISPL

Inspection, Commissioning and Acceptance

Testing: InspectionIR thermographic inspection shall be done at site post installation of modules.

If Bidder feel necessary to

conduct the same, Bidder can

do so

29Section 6 (ERQ)

ISPLDefinition

Independent lab shall be identified based on module manufacturing plant so as to avoid

shipment delays. Besides, it shall be mutually agreed.As per the Bid Document

30Section 6 (ERQ)

ISPL

Definition of the Yield at the Provisional

Acceptance Test: The adjustments for

mismatch and module quality losses in

accordance with the values of the

manufacturer flash list and the results of the

Counter Flash Tests).

Bidder propses, No adjustments for mismatch and module quality losses based on flash data of

modules.As per Bid Document

31Section 6 (ERQ)

ISPL

If the Installed Capacity will be higher than the

Nominal Peak Power, this will be reflected by

means of adjusting the module quality losses

of the original parameter setting of the PVsyst

simulation

No adjustment in module quality loss required based on flash data. As per Bid Document

32Section 6 (ERQ)

ISPL

GLPAC = guarantee level provided by the

Contractor (minimum value of 95%) [%]Is GLpac fixed at 95%? Please confirm As per Bid Document

33Section 6 (ERQ)

ISPL

Provisional Acceptance Test Calculation:

Formula to be referred

As Ymeter is in kWh, formula suggests Yt at Gpoa,t). Hence, Yt is not multiplied with Gpoa,t.

Please clarify.Yes multiplied by t (here t =1)

34

35Section 6 (ERQ)

ISPL

The PRmeasured will be corrected with the

actual ambient temperature,

as per IEC 61724 & NREL references, measured PR is adjusted based on module temperature

not ambient temperature.yes, cell temperature.

36

37Section 6 (ERQ)

ISPLRefer Formula

It shall be based on module temperature measured & module temperature from weather file.

Can we share our PR test procedure?Yes.

38Section 6 (ERQ)

ISPLRefer Formula

Bidder requests to consider 2% as tolerance between PRcorrected & PRguaranteed for plant

acceptance due to modelling error & instrumentation errorAs per Bid Document

39Section 6 (ERQ)

ISPL

Compare Final PRcorrected with Final

PRGuarantee: Refer Formula

Bidder requests to consider 2% as tolerance between PRcorrected & PRguaranteed for plant

acceptance due to modelling error & instrumentation errorAs per Bid document

40Section 6 (ERQ)

ISPL

(1) Installed Capacity = Σ Flash Peak Power as

adjusted hereunder

Bidder proposes that Installed capacity shall be sum of nameplate rating of modules installed.

Flash test data as provided by module manufacturer shall be submitted for verification. Please

confirm

As per BID Document

41Section 6 (ERQ)

ISPL

Performance Guarantee: performance ratio

(PR) ≥ 77% (at metering point that is the HT

side of step-up transformers) at the time of

commissioning regardless the month the Plant

is commissioned

But at the time of commissioning, RFP mentions to calculate yield not PR. Hence, why is this

requirement of PR 77% at the time of commissioning? Kindly confirm. As per Bid Document.

42Section 6 (ERQ)

ISPL

Wind Condition:(page 66) mentions 225 km/h

(62.5 m/s) as the Basic Wind Speed for

location Gangachara, Rangpur

225 km/h wind speed is a serious concern for module manufacturers. As per IEC, modules are

designed for 130km/h wind speed. Please confirm??

Highest designed wind spped is

to be 62.5 m/s as per BNBC.

43General: As per Google earth imagery, there

are ponds in the area which needs to be filled. Bidder assumes these works are not in bidder's scope. Please confirm Land filling work is not in

bidder's (Lot 2) scope.

44Section 6 (ERQ)

ISPL

PV Plant Control and Monitoring System

(DCS – Digital Control System) / Supervisory

Control and Data Acquisition (SCADA) for

the PV Plant, including all necessary software

licenses

Bidder proposes PLC base SCADA system with necessary software licenses

Need to be comply with local

requirement / standard.

45Section 6 (ERQ)

ISPLCCTV

There are no co-relation between CCTV and SCADA, however CCTV Monitoring will have

separate software and hardware.As per bid document; advised

to see the DCS conceptual

Drawing.

46Section 6 (ERQ)

ISPL

RAID Station (Redundant Arrays of

Inexpensive Disks) for Long Term Data

Server router

Bidder proposes 1 operator station, 1 operator/engineering station with RAID 5 configuration Accepted

47There were some No. that we can’t find in the bidding documents, such as Invitation for Bid

No, Bid Security No, Alternative No, ICB No marked in the attachment with yellow colour. I’m

kindly you can send these No. to me.

ICB no: ISPL/2017/06/1/L2

48

1. What is the relationship between the elevation of the contour map in Annex 4 of Tender book

and the elevation FGL38.50 of the PV site in the road & protection drawing before the tender?

How does 8.22 m belong to the elevation of the tenders? The rough view of the floor from

Google Maps is 36-37m.

2. Bidding documents Annex 04 Contours Water Level 8.342 is a flood water level for 20 years

or 50 years?

3. How many people are allowed to labor in Bangladesh? Is there a requirement for the

proportion of Chinese workers?

4. Is there a prefabricated concrete pile or tubular pile in Bangladesh?

1. 2. Bidders do not need to

worry about that. Employer will

provide the ready to build land

to the bidder. Pls refer to the

conceptual drawings.

3. No limitation.

4. Yes. You need to source.

49 Inverter voltage 1000V/ 1500V both are accepted.

50 Inverter Working Temperature 42 or 50maximum operating

temperature +60 degrees C

51Section 1 of

“Section 6 (ERQ)

ISPL”: Section 2.4.6

For the simulation of the expected yield of the

PV plant, which is the basis for the guaranteed

performance, the NASA SEE data set shall be

considered

if the NASA SEE data set for this project can be provided by Owner?Bidder should organize and

submit the simulation result.

52

Please refer to the

drawing “Annex A -

02 PV Plant

Layout” in the File

Folder named Fw_

Drawing & Design.

Some mistakes are observed in the said

conceptual drawing

（eg. 1>No side space between PV tables,

nomally 0.8m distance should be reserved at

both side ; 2> layout of some modules are out

of Set boundaries ; ）

Do we need to follow the said conceptual design？

Pls see Fig Annex C 01 for

details of mounting structure

gap.

* Yes. If you have better design

you can provide.

53

Please refer to

section 1 of the file

“Section 3 (EQC)

ISPL”

It indicated that in both the cases the

inclination angle must be 25° (facing towards

south) and the spacing of adjacent PV clusters

should be more than or equal to the ratio

mentioned in the conceptual drawing of PV

mounting structure (L/H≥2)

1)The defined inclination angle （25°）may not the optimized angle，can we change it as per

our own design ?

2)As per the design data get from dawing “Annex C

- 01 Mounting Structure of Solar PV Module”，the spacing of adjacent PV rows is 3.32m,

which may not the optimized distance, can we make the

modification？3）once we make modification according to our design， then the land size may not enough

for a capacity of 40MWp（≥40MWp）,please advise.

1. You can change the

inclinational angle but you need

to provide yield comparison

and need to take approval at

the time of design submission

to the Employer (ISPL)

2. Its only conceptual drawing,

You can suggest better design

but the ration mentioned inhe

drawing (L/H must be greater

than or equal to 2). But

propoer explanation should be

there with simulation result.

3. You need to submit the

design within the given land. If

you have alternate design you

can provide so as alternate

design. Employer has the right

to accept or reject the modified

design. You can also use higher

efficient panels for space

optimization.

54Section 1 of

“Section 6 (ERQ)

ISPL

Scope of Supply of Plant and Services: Bidder

needs to construct the 33 kV overhead

evacuation line from the PV power plant

evacuation switchyard to the nearby 33 kV

substation at Kaliganj, Lalmonirhat which is

approximately 10kM away

As per the data get from drawing “Annex A - 01 PV Plant Layout with Location Photo”, the

distance of the 33 kV overhead evacuation line from the PV power plant evacuation switchyard

to the nearby 33 kV substation at Kaliganj, Lalmonirhat is 7.5kM, which not 10kM.

please clarify which value mentioned above is correct？

Actually our Transmission line

is 33KV double circuit line.

***Google Map shows that the

total line will be 7.5 km along

the road. We are considering

the evacuation line not more

than 10 km. Bidder is

responsible for selection of

proper line route. It is advisable

to consider 10 km of

tranmission line.

55Section 1 of

“Section 6 (ERQ)

ISPL

Scope of Supply of Plant and Services:

The work “Supply, Installation, Construction

and Commissioning of 40MWp ISPL Solar

Power Plant” at Gangachara, Rangpur is

divided into three Lots， which are Lot-

1，Lot-2 and Lot-3.

All of the three lots are within the scope of Bidder or Just Lot-2 is within the scope of bidder?\

Please Clarify accordingly.

Total work is divided into three

lots: Lot-1: Land

Development, Boundary wall,

Embankment, Village Road.

Lot-2: EPC part ( Panel,

Inverter, Transformer,

Mounting Structure,

Transmission

line,SCADA,Substation, Office

Building etc)

Lot-3: Helipad, Guest House,

Play Ground, Staff quarter.

Scope of works of different

Lots are completely different.

THis tendering process is only

for Lot 02. If you are interested

you can participate other lots

but that will be considered as

seperate work.

56Regarding the MV&LV cables, except the PV cables, if aluminum alloy cable is acceptable？(eg.

LV Cables from combiner box to transformer)

We prefer to use Cu cables

upto the evacuation SS.

57

Please refer to

Section 1 of

“Section 6 (ERQ)

ISPL”:

Scope of Supply of Plant and Services:

A 5 kWp solar PV system (on the roof of control room and office building) with Li-ion based

battery for backup power supply of the plant. Excess power should share the load of the plant.

Our question:

1> 5kWp herein is refer to DC or AC power?

2> What is the capacity requirement of Li-ion based battery？3>It has come to our notice that this is a roof mounted grid connected PV system, please

indicate the location of the interconnection point

4> What is the function of this system? Please share more details in this regard.

1. AC power for the plant use

andf emergency back up.

2. We need four (4hours

backup) 3. yes you should

implement the back up system

on the roof of the office

building and the inter

connection point also in the

building for backup electricity

at the time of load sheding

4. Its back up for security

premises. After the battery is

fully charged the additional

power will be feed into the

local AC distribution board to

share with the grid power.

58Clause 2.4.2.10 of

"Section6 (ERQ)

ISPL"

PV module mounting structure (Solar Arrays)--

To avoid and minimize effects of flooding the

minimum height of the modules at any point

shall be

higher than one meter above the recorded

flood level as indicated in the general layout

drawings. There is no information about flood level indicated in the general layout drawing. Please confirm

and provide the value accordingly.

The employer will developed

the land upto the recorded

flood level. You are to design

such that the lower part of the

PV panels are 1 meter above

the ground level. The

transformers base will also need

to be raised by 1 meters from

the filled gound level.

59

We just compared the NASA SEE, and we

found that the MeteoNorm Data 7.1 is much

more accurate than NASA SEE, so please

clarify if we can use MeteoNorm Data 7.1 to

instead of NASA SEE.

could we use the MeteoNorm 7.1 attached in software PVsyst. This data MeteoNorm is more

accurate than NASA SEE. Please clarify it.

Ok you can use meteo norm

data.

60According to

Section 6

(ERQ)，page10，

the Bidder shall consider the possibility of cyclones during its design.Please provide the basic

wind pressure of the cyclones.

The design should withstand a

maximum a wind speed of 62.5

m/s

61 Referring to

Section 6 Clause

2.3.5.3

“The minimum coating shall be specified during detailed design for a minimumlifetime of 50

years in use, in any case minimum 80 µm are required”, normally the design lifetime for the

mounting structure is 25 years. How to consider this difference?

Minimum lifetime is 25 years

62Referring to the

wind conditions at

Section 6 page 8,

the basic wind speed is 62.5m/s, and this record is for 50 years, however the normal design

lifetime for PV plant is around 25years. Thus, we shall conform to the basic wind speed for 50

years or for 25 years? This wind speed has a big effect on our mounting structure design and

cost.

Bidders need toConsider the

basic wind speed of 62.5 m/s

63 Our design shall consider the high water level, please provide the recorded flood level in the PV

plant area.

Employer will develop the land

considering the recorded flood

level

64 Please provide the Annex E，Soil test report. Attached

65 How many peoples shall be considered for office and staff dormitory capacity?

Satisfying the minimum

requirement given in the

conceptual design, Bidder can

propose their design

(Considering minimum 20

numbers of Office staff). Staff

dormitory is not the scope of

Lot-2 works

66Is there any requirement for the 33 kV overhead line? For the supporting structure, we can use

Concrete pole,wooden pole, or iron tower?

Follow the clause 2.4.1.1.5 of

section 6(Employer's

Requirement). The pole would

be SPC pole.

67In the Section 3

EQC PAGE 10,

the subcontractors, Item No.4,it shows that we need the 33kV switchgear.Usually the switchgear

means the Switch cabinet which is indoor type.However, referring to section 6 ERQ page 23,the

33kV equipment is outdoor type.Which one shall be complied with?

Bidder can propose their own

design.

68 How many people are allowed to labor in Bangladesh? Is there a requirement for the proportion

of Chinese workers? No Limitation

69

Refer to Section 6 ERQ Clause 2.4.1.5, the 33KV equipment shall adopt out door

type, however the drawing “Annex C - 02 Service Building Details” has the MV

room. Please confirm that the 33KV equipment shall adopt out door type or in

door type?As per Tender Document

70

Refer to “Annex B – 01Single Line Diagram of the Plant”, the power supply of

the two Auxiliary transformers all come from the bus. If the bus is breakdown,

there is no backup for this mode of connection. Please confirm whether it should

be designed as the Annex B – 01?In Annex B-01 double bus bar

system is suggested.So there is

always an option incase of

breakdown.

71

There is no mention of diesel generator within “Annex B - 01 Single Line

Diagram of the Plant”, however, the tender documents Section 6 2.4.1.2.16

mentions 200KVA diesel generator, please confirm if the diesel generator is used?

Please follow the clause

2.4.1.2.16 of Section 6 and it is

for back up power only.

72Please confirm that whether the lighting is adopted within PV area?

Yes Required

73

74 Please confirm the dispatch requirement for communication system.Please refer to Annex

D-04

75

What’s the requirement of supporting structure of 33KV line, whether the iron

tower or other supporting structure types shall be adopted? If the iron tower type

is adopted, the type of double circuits on the same tower or single circuit iron

tower, which one shall be adopted?Please refer to clause 2.4.1.1.5

of section 6

76

Refer to Section 6 ERQ 2.3.5.3, “The minimum coating shall be specified during

detailed design for a minimum lifetime of 50 years in use, in any case minimum

80 µm are required”. Normally, the design lifetime for the mounting structure is

around 25 years, please confirm whether 25 years lifetime of mounting structure

could be used?

Minimum 80 µm is required

and The minimum lifetime is

25years.

77 There has a conflict between Section 6 Clause 2.4.5.1, Table 2-2 and Section 4

Schedule No.1 Plant (including Mandatory Spare Parts) Supplied from Abroad,

Mandatory Spare Parts, which one shall be complied?

Please follow the section 4

schedule -1.

78

Section 6, Page 86,

According to the description of Wind condition in page 8, section 6, the basic wind speed for

the location Gangachara, Rangpur is 62.5 m/sec, Please confirm the accuracy of the data

provided in the bidding document

This is according to

Bangladesh National Building

Code 2014. Pls note that "the

Basic Wind Speed" is

measured as 3 second gust

speed at 10 metres above the

mean ground level

79 Section 6 (ERQ)

ISPL, Clause

2.4.1.1.1.5

In the component list in section 6, clause 2.4.1.1.5, it is mentioned that some outdoor

disconnecting switches, circuit breakers etc. is the 33KV power equipment is required to be

desined in accordance with the open structures?? Are metal enclosed assembles (cabinet

structures) considers? state clearly? Yes.

80

Annex B-01, Single

Line Diagram,

Section 4, Page 6

Accordaing to the single line diagram, the capacity of Auxiliary Transformer is 100KVA. How

ever in the schedules of rates and price , the price of auxiliary transformers is 200 KVA.

Please clarify the capacity of Auxiliary Transformers.

1X200 kVA or 2X100 kVA or

you can propose according to

your design, but the total

capacity should not be less

than 200 kVA

81 Are you going to deduct any taxes from the foreign currency payment? Are you going to

deduct any taxes from the local currency payment?

No. Employer is responsible

for all local taxes and import

duties.

82 Is transport of Offshore items from destination port to site ISPL's scope? Yes.

83

In the 33kV system we can see many isolators. We understand you need redundancy. Some

isolators can be avoided but redundancy can still be there. Can we redesign the system

maintaining the redundancy? yes

84

Clause 2.3.9,

Section 6 -

Employer’s

Requirements,

The scope EPC Contractor needs to

construct 33 kV double circuit overhead

transmission lines from PV power plant to

the nearby 33/11 kV substation at Kaliganj,

Lalmonirhat. The substation and conceptual

evacuation system is outlined in the

diagrams. The Bidder shall include with their

Bid a complete and detailed description of

the interfaces.

Please inform of the length of 33KV DC transmission lines

The distance of the

mentioned SS along the road

is 7.5 kM. We are considering

a maximum of 10 kM. Bidders

needs to determine th eline

route along with employer

and employer will be

responsible for the right of

way.

85

Chapter 4.

Supplementary

Information,Sectio

n 6 - Employer’s

Requirements,

The following documents are provided to

the Bidder for his information: Additional

reference publications: Annex E – 01 Soil

Test Report Annex F – 01 PPA between ISPL

and BPDB

Annex F is not found in tender document, please provide. Pls find attached

86

clause 14 Taxes

and Duties, section

8-SCC

b) Bangladesh Income tax and VAT

The Employer shall pay all taxes and value

added tax (VAT) at the prevailing rule of the

Government from all payments of foreign

currency & local currency (except on CIF

price mentioned in Price schedule -1)

please confirm that all VAT applicable to the Contract Price regardless of currency will be

paid by the Employer.

Employer is responsible for

local duties and VAT

87

Article 3 of

Contract

Agreement

3.1 The Effective Date upon which the

period until the Time for Completion of the

Facilities shall be counted from is the date

when all of the following conditions have

been fulfilled: (a) This Contract Agreement

has been duly executed for and on behalf of

the Employer and the Contractor; (b) The

Contractor has been advised that the

documentary credit referred to in Article 2.2

above has been issued in its favor.

the following clause shall also be one of conditons for contract effective date:

(c) The advance payment is made to the Contractor;

No advance payment

88

Appendix 1 -Terms

and Procedures of

Payment

In schedule No. 1

Eighty percent (80%)of the total or pro rata

CFR amount upon Incoterm “CFR” or “C&F”

within forty-five (45) days after receipt of

invoice and shipping documents. In the

event that shipping is delayed upon the

written instruction of the Employer for more

than twenty-eight (28) days beyond the date

shown in the Program of Performance

provided in accordance with GCC Sub-Clause

18.2, the Contractor may make application

for this part of the payment against

warehouse receipts, provided always that

the plant and equipment are ready for

shipment on the date shown in the said

Program.

Eighty percent (80%) of the total or pro rata

CFR amount upon delivery to Site within

forty-five (45) days after receipt of invoice,

less seventy percent (70%) of the CFR

amount already paid or authorized for

payment.

(1) Advance payment being 15% of Contract Price is recommended to be maid to Contractor

within 28 days after contract signing date.

(2) Please confirm that Eighty percent (80%)of the total or pro rata CFR amount upon

Incoterm “CFR” or “C&F” within forty-five (45) days after receipt of invoice and shipping

documents, and the last paragraph cited shall be deleted.

1. No Advance Payment.

2. Ammendment will be made

and circulated

89

ITB 19.1,BDS b)The prices for the Goods and Services

which the Bidder will supply from within

Bangladesh shall have to be quoted in

Bangladesh Taka.

Please confirm that bidder can quote both in foreign and local currency for civil work and

installation.

All the price will be converted

to US$.

90

Tender sucurity

Please kindly clarify the tender security opening method, it's shall be issued by any schedule

bank of bangladesh or foreign bank duly endorsed by a scheduled bank in bangladesh?

First portion isn't understood

properly. In both way bidder

can provide tender security.

91

BDS ITB 22.2 Authenticated board resolution? The authenticated by company's corporate representative is acceptable or not?

If the representative is

authorized by the

management, then it will

work

92 Please confirm the design wind speed of the line is 225km/h. Whether it is 3 seconds gust? Yes.

93

Please provide the meteorological data for the transmission line（include maximum

temperature、 minimum temperature、annual average temperature、ice thickness）

Maximum ambient

temperature= 45°C, Minimum

=5°C, Average temperature= ,

No ice,

94 Please provide the pollution class or creep distance(mm/kV) Bidder's responsibility

95 Whether the line needs ground wire? Yes

96

In the SL. NO.21 in clause 2.4.1.15 of section 6, it's described as "10km from power plant

supply switchyard to Kaliganj substation receiving switchyard (15m SPC Pole …as per BPDB

standard…)". (1.) Does the SPC Pole mean the pre-stressed concrete pole? And it will be

better if any reference drawings or pictures can be supplied. (2.) It's said that the pole's

design should be according with the BPDB standard. Whether the IEC standard or similar

standards can be applied? (3.) The span now is designed preliminarily as 50m-60m. Please

confirm whether that issuitable? Or more requirements should be supplied.

1) SPC= Spun Pre-stressed

Concrete, 2) BPDB standard,

3) It depends on the line

route, generally for straight

line double circuit it is around

35 m.

97Please confirm the 33kV equipment of PV Plant delivery station at plant location are GIS or

outdoor equipment. Not GIS.

98 According to REQ section-6 2.4.1.1, The incoming feeder from the LV/33 kV transformer

consists ofcircuit breaker and an earthing switch. Please confirm the circuit breaker and

earthing switch are outdoor equipment or included in the LV/33 kV transformer. Bidders are free to offer any.

99

According to EQC page2:“In both the cases the inclination angle must be 25°(facing towards

south) and the spacing of adjacent PV clusters should be more than or equal to the ratio

mentioned inthe conceptual drawing of PV mounting

structure（L/H≥2）.What is the meaningL/H≥2？Whether the inclination angle must be

25°？

Pls see the drawing (Annex- C

01)

100

101 Please confirm whether the grid side equipment are included in our scope of work. The

equipment of grid side are outdoor or switchgear.

Bidders responsibility is upto

the evacuation substation at

Kaliganj 33/11kV substation.

102Please confirm the quantity and capacitor of auxiliary transformer. 1 set or 2 set , 100kVA or

200 kVA.

1X200 kVA or 2X100 kVA or

you can propose according to

your design, but the total

capacity should not be less

than 200 kVA

103 The annex B-01 single line diagram of the plant is only conceptual design. Can we design the

scheme according to our own design philosophy?

Yes. You can do but needs to

keep the redundancies.

104According to ERQ page 45 “Fixed Mounting System”, Please provide the specific

requirements of the spacing of the north and south pv assembly?

Pls see the drawing (Annex- C

01)

105

The area as shown in the drawings“Annex A - 03 Topographical Survey”is much smaller than

that given in the tender documents“The selected area for the photovoltaic installation has

approximately 150 acres. ”Please provide the red line inflection point coordinate or the

correct CAD red line diagram. CAD drawing is provided

106

General: As per Google earth imagery, there are ponds in the area which needs to be filled.

Land filing is the scope of Lot

01.

Lot 2 bidder will get the filled

land.

107

2.4.3.1----Section 6

(ERQ) ISPL

PV Plant Control and Monitoring System

(DCS – Digital Control System) / Supervisory

Control and Data Acquisition (SCADA) for

the PV Plant, including all necessary

software licenses

Bidder proposes PLC base SCADA system with necessary software licensesCan do that but should meet

BPDB and PGCB Standard /

requirement.

108 2.4.3.1----Section 6

(ERQ) ISPL

CCTV There are no co-relation between CCTV and SCADA, however CCTV Monitoring will have

separate software and hardware.Separate is acceptable

109

110

A 5kWp solar PV system (onn the roof of

control room and office building ) with Li-ion

based battery for backup power supply of

the plant. Excess power should share the

load of the plant.

Kindly Clarify the detailed requirement for 5Kwp solar PV system. Provide Lead Acid battery

in place of Li-ion Battery .Kindly accept.

Pls refer to page 3 & 36 of

section 6.

111

Provisison of temporary security rooms

according to the authorities requirements.

Kindly Clarify the scope of the requirement. Scope of Lot 3

112

Site services as required for the construction

and commissioning of the Plant such as

electricity supply, potable water, instrument

and service air, fuel supply,

telecommunication etc.

Construction of power & water to be provided by Employer FREE OF COST Bidder's responsibility.

113

Provisison of web cam for site & progress

supervision form start of construction

including GPRS

communtication system wide angle, tilt and

roatation capbilty , HD quality and remote

control features at light poles , as well

appropriate record and storage capabilites.

We have provide CCTV Camera's for site survallience in place of web cam. Kindly accept. OK

114

The selected area for the photovoltaic

installation has approximtely 150acres.

Offered land is not sufficient to install 40MWp Dc capacity, As per Solar Power Plant

standard minimum require land 4.5Acre/MWp. So kindly confrim the availabilty for the

same.

Pls use higher efficient panels

to accommodate.

Accommodate your design

within th egiven boundary.

115

Site Description The project site at

Gangachara (located at 25.9061oN and

89.2201oE) in district of Rangpur, at the

Eastern bank of Tista River

Kidly share the auto cad drawing for offered land to furnished the tantitive moduole layout. Shared.

116Mentioned Wind Speed 225 km/hr. As we have considered the IS 873 part- 3 for wind speed calculation, So kinldy accept the

same.

Pls refer to the answer of

query number 78

117

The nominal power ratio (maximum input

power of the inverter/nominal power of PV

array at STC) of the inverter should be equal

to or greater than 85%.

Kindly confrim the AC capacity. Nominal AC power of the

inverters/PV panel capacity in

Wp at STC 85%

118

The delivery station will connect the PV

Plant to a dedicated 33 kV double circuit

overhead transmission line upto Kaliganj

33/11kV Substation

kindly confirm the distance and share the specific requirement at the connection point(if

any)

Pls refer to the answer of

query number 84

119

There will be redundant bidirectional energy

meters for metering export and import

energy. The billing meters will be located at

the plant‟s 33kV switchyard.

Offer ABT merter panel with Main & check meter to comply the redundancy at the plant

end switchyard.Kindly confirm.

Pls send the specification.

120

Thermal and acoustic insulation of buildings,

structures and equipment shall be provided

as appropriate to conserve energy and to

minimize the noise impact, provide

personnel protection, provide protection

against freeze or overheating.

Offered building with proper ventilation to avoid overheating. In addition to that equipment

mount in the building not source of any kind of noise. Hence thermal insulation and acoustic

insulation is nt required . Kindly accept it

Control room should be

equipped with air

conditioning system.

121

As mentioned steel work shall be designed

to acceptable international Standards.

Steel Strucures of MMS shall be design as per IS standard in Staad, Kinldy accept . IS stands for Indian Standard

or International Standard?

122

The string length of modules connected in

series depends on the voltage of single

modules in order to not surpass open circuit

string voltages of 1,500 V under extreme

environmental conditions (low temperatures

and high irradiation).

Kindly confirm to use 1000V DC as maximum input voltage of invertor and correspondingly

rest of the equipment will be based on invertor input voltage.

1000V and 1500 V both are

acceptable. Safety and

protection scheme should be

designed accordingly.

123

The incoming feeder from the LV/33 kV

transformer consists of circuit breaker and

an earthing switch. The outgoing feeder for

the connection between PV transformer

stations and delivery station consists of

switch-dis-connector and an earthing switch.

Offered Transformer station is per proposed SLD. Kindly accept As per Bid Document.

124

PV DC connectors for string interconnection

shall be of the same brand and type as used

PV module manufacturer.In no case

connectors for different brand are to be

used in the same condition (male-

female).Under no circumstances it is

allowed to cut the PV module cables and to

install other than oroginal connectors.

MC4 equivant make connector to be provided.Kindly accept the same As per Bid document

125

EARTHING OF TOTAL SUBSTATION (YARD

PLANT SITE & GRID SIDE) that individual&

total mashed system earthing value will be

less than 0.5 ohm. (Bidder have to submit

the earthing diagram with details drawing

for earthing system evaluation. Individual

earthing without mash have to done for

Lighting Arrestor & Transformer Neutral.(

Total Earthing system have to comply with

National earthing system of grid substation)

As per IS 3043,system earthing value less then 1 Ohm. Kindly accept the same. As per bid document

126

Supply of oil-immersed, natural air cooled, 3-

phase, 50-Hz, 0.415KV/33 KV ,2500KVA,

YND11, Indoor/outdoor type distribution

transformer

Kindly allow us consider three winding transformer of inverter duty to decrease the BOS of

the plant. Please accept.

As per bid document

127

Construction of switch yard for 4 nos. of

VCB, 5 Nos. of Isolator, 5 Set Lightening

arrestor with required conductor,

accessories, structure etc.& ground should

be gravel(2"/3") finished(Complete) (Follow

SLD)

Offer 33kV HT panel with 7 incomer from Transformer station,1no. Aux. transformer

incomer,1 tie beaker & 2 nos. outgoing. 2 nos switchyard with isolator CT,PT ABT Meter

.Kindly accept the same.

As per bid document

128


VCB, 18 Nos. of Isolator, 4 set. PT, 6 set CT, 6

Set Lightening arrestor, 2 Nos. 100KVA

Auxiliary transformer, with required

conductor, accessories, structure etc.&

ground should be gravel(2"/3")

finished(Complete) (Follow SLD)

Offer 33KV HT panel with 7 incomer from Transformer station,1no. Aux. transformer



As per bid document

129


VCB, 2 Nos. of Isolator, 2 set. PT, 2 set CT, 2

Set Lightening arrestor with required

conductor, accessories, structure etc.&

ground should be gravel(2"/3")

finished(Complete) (Follow SLD)

Offer 333KV HT panel with 7 incomer from Transformer station,1no. Aux. transformer



As per bid document

130

LV AC and control cables:

Conductors - Stranded annealed copper. The

grade and quality of the copper used for the

conductor shall have purity of the order of

min. 99.5%.

Kidly allow us to consider Aluminum cable batween inverter to inverter tansformer to

reduce BOS cost.

As per bid document

131

The maximum voltage drop in the cables of

any AC circuit from the inverter output to

the MV switchgear shall be < 1.50% at STC.

Amendment of maximum voltage drop

for each type of cable from 1.5% to 2%.

As per bid document

132

A lightning and overvoltage concept shall be

designed according to the IEC 62305 (all

parts). PV Plant shall be equipped with

lightning protection system LPS I according

to the IEC 62305. If the result of risk

assessment (according to the IEC 62305-2)

proposes is different, LPS class than this is

also acceptable.

As per solar Application ESEe type of Lighting aresster protection for PV array is used

complying with NFC 102 standard .Kindly acept

As per bid document

133

The digital control system (DCS) shall be

supplied from a 24 V DC system. Redundant

24 V DC distribution system shall be

provided.

we have provide 230v ac supply to SCADA. 24V DC Power pack is inbuilt part of SCADA. As per bid document

134

The 110/24 V DC/DC converters serve as

supply for I&C cabinets and other

consumers requiring 24 V DC supply. Each

DC/DC converter is supplied via coupling

diodes from both sections of the110 V DC

main distribution.

we have provide 230v ac supply to SCADA. 24V DC Power pack is inbuilt part of SCADA. As per bid document

135

For the DC system, the Bidder shall supply Li-

ion type batteries designed according to

Standard EUROBAT 15 with a life expectancy

of 20 years or more

Kindly allow us to consider VRLA/Ni-cad battery in place of Li-ion battery Li based battery

136

A 200 kVA generator should be installed in

the plant location for emergency use. The

generator will be equipped with ATS and

sound proof canopy.

Kindly share the requirement and also specify the connection detail in tender SLD The generator will be

connected to the distribution

board of the plant power

supply for back up power.

137Avg. send filling height =2.977mtr Has compection test been done at site after send filling?Please share the result Not done.

138

As per summary sheet at site report ,the soil

parameter the C AND ø value obtained from

direct share test . Our provide at 100 feet

level and no value before it

does it signify that minimum pile boaring depth shall be 150.

No.

139 Bid submission date is 24/07/2017 Please confirm if any extension for submission is provided. No further extension

140

The installed capacity shall be equal or

higher than 40MWp. The PV plant will

consist of the deployment of higher

efficiency PV generation technology and

three phase string inverters.

Cosnidering the wind speed, Is the bidder allowed to bid with central inverters or it nees to

bid with string inverters only?As per bid document

141Metallic and non-metallic materials shall be

UV resistant UV resistant property will be applicable to selected exposed equipment only. ok

142

Tariff metering shall be at the HT side of the

transformer and inside control room

building

Tariff meter at HT side of Transformer but place inside the control building may increase the

burden on CT/PT and hence recommended to place at the switchyard. Please confirm. ok

143PV Plant Control and monitoring system and

performance calculation (in case of central

inverters) Bidder propsoes to use Zone monitoring (if Central inverters are acceptable). Please confirm String inverters

144 Transmission Interconnection Is it under bidder's scope. ROW shall not be in bidder's scope. Please confirm Employer will organize RoW

145 Transmission Interconnection Is there a bay extension work in the connecting subststaion? Yes

146 Transmission Interconnection

If bay extension is under the scope of bidder then the connecting substaion equipment

specification is needed. Kindly share the same? Bidders scope

147Transmission Interconnection

If bay extension is under the bidder scope, then please confirm that land is abvalable for the

same. If not, land procurement shall not be in bidder's scope. Please confirm

If land is needed employer

will organize

148The system of SDH or PDH within the optical fiber communication mode, which one is

correct

SDH optical fiber

communication mode

149 Neutral Grounding method?? Mesh connection

150

What is the requirement of supporting structure types shall be adopted? The Iron tower

type is adopted, the type of double circuits on the same tower or single circuit iron tower,

which one shall be adopted?

Double circuit, SPC pole is

required

151 what is the interface point of water supply & drainage system Bidder will design

152 Is there any detail requirement for PV modules cleaning system

No, Bidder can design their

own

153 What is the use of the erosion protection within " AnnexA-02 PV plant Layout" It’s the requirement for Lot 1

154

there is a conflict between section 6 clause 2.4.5.1, table 2-2 and section 4 schedule no 1

plant ( Including mandatory parts) supplied from abroad, Mandatory Spare Parts, which one

shall be complied Follow chapter 4

155

f. In Section 6 of the tender, the equipment and quantities of meteorological stations

include:

1）1 "Pyranometer for the global horizontal irradiance "；

2）2 "Pyranometers for the global inclined irradiance at 25º "；

3）1 "Shielded ventilated thermocouple to measure ambient temperature with a

measurement accuracy of ± 1

℃

(

℃

= Degree Celsius) "；

4）2 "Resistance thermometer (e.g. Pt100, Pt1000) or equivalent to measure the

temperature of modules (on the back of the PV modules) with a measurement accuracy of ±

1

℃

"，

5）1 "An anemometer to measure the wind speed and wind direction sensor at the site."。

Is it according to the quantity supplied above, or is it the quantity supplied and quoted

above each item multiplied by 5?

Follow chapter 4

156 The deterrent sensor in the pv region's red line, because the fence is not within the scope

of the bid, shall the deterrent sensor be ordered in LoT-2? Scope of Lot 2

157The diesel generator has a contradiction between 250kVA in Section 4 and 200kVA in

Section 6, choosing that power generator? 200 KVA

158

There are three items for the spare parts in Schedule No. 1of item 8, item 16-22 and

Schedule No. 6 of Section 4. The quantity and requirements of spare parts are inconsistent

in P66 of Section 6. How is it considered?Follow chapter 4

content in bidding si reference document clarifications requested...

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