Our Ref 6/12/VOO/voo 23 - Kenya Power | kplc.co.ke · TKN- 66 kV Transformer Protection and ... (6...

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Central Office – P.O. Box 30099 Nairobi, Kenya

Telephone – 254-02-2301174 – Telegrams “ELECTRIC” Telex No. 22253 Fax No. 254-02-3201889

Stima Plaza, Kolobot Road.

Our Ref: KP1/6BA/PROJ/PT/26/12/VOO/voo 23rd

October, 2012

M/s

Dear Sir/Madam,

ADDENDUM NO.2 TO THE TENDER FOR SUPPLY, DESIGN & INSTALLATION OF THIKA

NORTH 66/11KV SUBSTATION & ASSOCIATED LINES- KP1/6BA/PROJ/PT/26/12

The following amendments are made to the specified provisions of the Tender documents for Supply,

Design and Installation of Thika North 66/11kV substation and lines.

1. RELATIONSHIP WITH THE PRINCIPAL TENDER DOCUMENT

Save where expressly amended by the terms of this Addendum, the Principal Tender Document shall

continue to be in full force and effect.

The provisions of this Addendum shall be deemed to have been incorporated in and shall be read as

part of the Principal Tender Document.

2. CLARIFICATIONS & AMENDMENTS Refer to Appendix 1 & Appendix 2 for clarifications and amendments to Tender document.

All the other terms and conditions remain as per the Tender document.

Yours faithfully, For: THE KENYA POWER & LIGHTING COMPANY LIMITED

A. GATUKUI (MRS)

PROCUREMENT MANAGER

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Appendix 1

Pre-Bid Meeting for Tender number KP1/6BA/PROJ/PT/26/12-Design,

Supply and installation of Thika North 66/11kV substation and associated

lines Date held: 17

th October 2012

Time: 10.30 a.m. to 11.30 a.m.

KPLC staff present 1 Eng John Njehia –AG. Projects Manager

2 Fidelis kavita - projects engineer, Projects Turnkey

Bidders Present

No Name

1 S. Kigera

2. Nicholus Sambu

3. James Abuga

4. Callen Kerubo

5. Leah Muli

6. Samuel Odila

7. Dependra Rele

8. Dinesh K.Shuka

9. Jin Hua

10. Zhu Xinhao

11. Eric Muya

12. Amos Tungwa

13 Paul Domet

14 Jonathan R

15. Mark Kuka

16 V Komu

17 Amos Otieno

18 Jose Rodrigues

19 Michael Sigwe

20 Patrick Karugu

21 Ben Mutai

22 Joseph Muturi

Matters arising

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1. Q. Local preference as per the act.

Response.

Refer to volume 1, ITB 34.

2. Q. Experience for contractor on concrete poles is too high.

Response.

Amend clause 2.4.2 of bidders as follows.

2.4.2 Specific Experience (b) For the above or other contracts executed during the period stipulated in

2.4.2(a) above, a minimum experience in the following key activities:

1. Design, supply and installation of Medium Voltage (66KV and above)

Substation with minimum capacity of 5 MVA.

2. Construction of lines for at least 100km in any voltage.

3. Q. Soft copies for tender documents to be availed in MS Word.

Response.

Kindly pick the soft copies of the technical guarantees from our office

in MS Word.

4. Q. Can power cables be made of aluminum instead of copper.

Response. 66kV 400 sq.mm single core & 11kV 630 sq.mm

single core cables to have copper cores while 11kV 300 sq.mm

three core cables can be either Aluminium or Copper.

5. Q. Personnel for construction engineer, Diploma with relevant

experience should be considered.

Response.

Evaluation criteria 2.5 remains the same.

6. Q. Review the issue of Kenyan citizens will ERB registration.

Response.

Evaluation criteria 2.5 remains the same.

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7. Q. The 66/11Kv transformer. Kindly confirm the following.

Criteria Response

Short circuit levels should the

employer provide values or will

the contractor use IEC standards

Refer to Volume 2 5.2.

The clearance between phase to

earth has being given as 500mm

yet the IEC standard states

100mm

Use employers requirements.

Should a cable box be provided

for the transformer.

The 11KV output should exit

through a 11KV bus therefore a

cable box should not be

provided

Will CTS be provided for the

inside the transformer.

Refer to volume 2 ,5.2

8. Q. The experience of the OPGW contractor. Can a CCK certified

person replace a subcontractor.

Response.

No, A subcontractor will be required.

9. Q. What is the full names of CCK

Response.

Communication commission of Kenya

10. Q. The route for 66KV line

Response.

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A KMZ file will be provided with the route, the route for the cable

is as shown during the site visit. The file can be accessed from the

KPLC website.

11. Q. Perimeter wall foundations, razor wire and electric fence.

Response.

The contractor will design the foundation perimeter fence based on

the soil investigation.

The minimum of four strands shall be used for the electric fence.

12. Q. Clarify the busbar material to be used

Response.

Refer to Volume 2 clause 4.1.1.6.2.

13. Q. Will the station plot be fully developed.

Response .

The plot area is 0.405HA and the dimensions are as indicated in the

figure below. The plot to be developed is plot number is 2305. The

plot shall be fully developed. Kindly note the dimensions of the plot.

of 20

14. Q. Mode of payment, Will an LC be used.

Response .

The LC shall only be used on the foreign component. i.e. Schedule 1

only. The effective date shall be after the issuance of the LC.

15. Q. Consider extending the closing date by 2 weeks

Response .

Extension of tender closing date is declined.

16. Q. Will the railway crossings have guard nets.

Response .

of 20

The railway crossings shall have guard nets.

17. Q. Are Nema approval part of the contract

Response .

The EIA report shall be provided to the winning bidder.

18. Q. Scope of the 11KV to be given fully.

Response .

See the amended scope of works for the line. The scope of works

for the substation remains the same.

Schedule No. 1. Plant and Mandatory Spare Parts Supplied from

Item Thika North Unit Length

66/11kV line material and works TKN-100 Pole erection ,Stringing and termination of a new

66KV line in concrete poles and with OPGW with

300mmsq AAA conductor km 20

TKN-110 Pole erection ,Stringing and termination of a new

11KV line in 150mmsq ACSR conductor in concrete

poles . Km 10

TKN-120 Up rating existing 11KV line to 150mmsq conductor

and in concrete poles Lot 6

TKN-130 Dual construction of lines of 66 with 33 and 11Kv

(recover and reuse existing 33KV /11Kv conductor.) Km 3

TKN-140 Terminating and Laying of 400mmsq 66kv single core

cable Km 1

TKN-150 Power line Earthing including PMEs Lot 1

TKN-160 LV conversion and transfer to new line (insulators &

accessories) Lot 1

OPGW

TKN-190 OPGW 48-core (Complete With Accessories) Km 20

Other Works

TKN-840 Civil works Lot 1

TKN-870 LV transfers Lot 1

of 20

Abroad

Item Description

Code1 Unit Qty

Unit

Price2

Total

Price2

DDP sites

(1) (2) (1) x (2)

Thika North substation, 1x23MVA,

66/11kV

Equipment/materials:

66 /11kV Line Material

TKN-

100 10M Concrete Poles Lot 1

TKN-

110 12M Concrete Poles Lot 1

TKN-

120 14 and 15M Concrete Poles Lot 1

TKN-

130 11kV 150mm2 ACSR conductor Km 27

TKN-

140 66kV 300mm2 AAA conductor Km 60

TKN-

150

66kV Line Fittings (insulators & accessories)

for all phases Km 20

TKN-

160

11kV Line Fittings (insulators & accessories)

for all phases Km 9

TKN-

170 Power line Earthing including PMEs Lot 1

TKN-

180

LV conversion and transfer to new line

(insulators & accessories) Lot 1

OPGW

TKN-

190 OPGW 48-core (Complete With Accessories) Km 20


66/11kV

TKN-

200

23MVA, 66/11 kV Power Transformer

Dyn1+RTCC complete Pc 1

TKN-

210 66 kV Circuit Breaker complete

Pc

2

TKN-

220

66 kV motorized Isolator without earth

switch

Pc

3

TKN-

230 66 kV motorized Isolator with Earth Switch

Pc

2

TKN-

240 66 kV Current Transformer

Pc

6

TKN-

250 66Kv Voltage Transformer

Pc

6

TKN-

260

Bus-bar material & conductors, all post

insulators, fittings & accessories

Lot

1

TKN-

270

All Substation Steel Structures, Marshalling

kiosk and outdoor panels.

Lot

1

TKN-

280

66 kV Surge Arresters complete with surge

counter & earth leakage meter.

Pc

6

TKN- 66 kV Transformer Protection and control Pc 1

of 20

290 Panel

TKN-

300 66 kV Line protection and Control Panel

Pc

1

TKN-

310

11 kV Neutral Current Transformer with

bridging surge diverter

Pc

1

TKN-

320 11kV Neutral Link

Pc

1

TKN-

330

Auxiliary transformer 100 kVA, 3-

phase,11/0.433 kV, with HV fuse protection Pc 1

TKN-

340

630mm2 single core XLPE 11kV copper

cable complete with terminations M 500

TKN-

350

300mm2 3-Core XLPE 11kV cable (between

indoor switchgear and line termination tower) M 1000

TKN-

360

11kV Switch Board Panel complete

(6 feeders + 2 incomers+1 Bus-section)

Pc 1

TKN-

370 11kV surge diverters complete

Pc 18

TKN-

380

Indoor terminations for 300mm2 3/c 11kV

cable

Pc

4

TKN-

390

Outdoor terminations for 300mm2 3/c 11kV

cable

Pc

4

TKN-

400

Substation Control Management system

(SCMS)

Lot

1

TKN-

410

SCADA telecommunication system (between

substation and RCC/NCC)

Lot

1

TKN-

420

Protection, control and measuring cables &

terminations & 70mm2 600V cables

Lot

1

TKN-

430 433VAC supply & distribution board

Lot

1

TKN-

440 110V DC battery & charger Pc 1

TKN-

450 48V DC battery & charger Pc 1

TKN-

460 Earthing system

Lot

1

TKN-

470

Radio communication equipment &

accessories including mast/tower

Lot

1

TKN-

480

Switchyard Lighting system including

central control panel Lot 1

TKN-

490 Ancillary Equipment Lot 1

TKN-

500 Lightning protection system Lot 1

TKN-

980

400mm2single core XLPE 66kV copper

cable (from 66kV bay to pole tee off)

complete withterminations& sealing ends

atboth ends

Meter

s

1000

TKN-

990

66kVLine Surge Arresters

PC

3

of 20

Mandatory Spares and Tools

Spares for transformers

ST-001 Auxiliary relay of each type. Sets 1

ST-002 Switches each type Sets 1

ST-003 Lamps each type Sets 6

ST-004 Contactor each type Sets 1

ST-005 Valve each type Sets 1

ST-006 Gaskets complete set Sets 1

ST-007 Silica gel (complete filling) Sets 1

ST-008 Dial type thermometer Sets 1

ST-009 Mercury (or similar) thermometer Sets 2

ST-010 Oil gauge each type Sets 1

ST-011 Gauge glass each type Sets 1

ST-012 Glass cylinder for silica gel breather Sets 1

ST-013 Bushing of each type Sets 1

Tools for Transformers

TT-001 Complete set of slings for lifting Sets 1

Spares for Substation

SS-001 66kV disconnector Sets 1

SS-002 Assorted MCB's for AC and DC distribution

boards Sets 20

SS-003 Trip coils for each type of Circuit Breaker Sets 2

SS-004 Close coils for each type of Circuit Breaker Sets 2

SS-005 11 kV indoor Circuit Breaker for feeder,

where applicable complete on trolley/drawer Sets 1

Tools

TS-001 Lap tops Sets 2

Totals

TOTAL (to schedule 5 Grand Summary)

Name of

Bidder

of 20

Signature of

Bidder

(1)Bidders shall enter a code representing the country of origin of all imported plant and

equipment

(2) Specify Currency

Country of Origin Declaration Form

Item Description Code Country

Schedule No. 2. Plant and Mandatory Spare Parts Supplied from

within the Employer’s Country

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Schedule No. 3. Design Services and Communication

Item Description Unit Qty

.

Unit Price1 Total Price

1

Local Currency

Portion

Foreign

Currency Portion

(1) (2) (optional) (1) x (2)

Thika North

substation,

1x23MVA,

66/11kV

TKN

510 Substation Design

(Electrical,

Mechanical, Civil,

Control/protection

engineering)

Lot

1

TKN

520 MV (11 & 66kV)

Line Design

Lot 1

TKN

530 Coordination of

relay settings

Lot 1

TKN540

Communication 2 Lot 1

Training in

Telecommunications,

protection & control

TKN

550 Protection training Lot 1

TKN

560 Substation Control

system (SCS)

training

Lot 1

TKN

570 Telecommunications

Training

(OPGW/SCADA)

Lot 1

Name of Bidder

Signature of Bidder

1 Specify currency in accordance with specifications in Bid Data Sheet under ITB 18.1 in Single Stage Bid, or ITB 30.1 in

Two Stage Bid. 2communication is defined as airtime maintenance for two cell phones for the Employer’s project engineers during the

whole period of the contract from the contract effective date. The maximum usage shall not exceed KSHS 150,000.

of 20

Schedule No. 4. Installation and Other Services Ite

m Description

Uni

t Qty Unit Price1 Total Price

1

Forei

gn

Curr

ency

Porti

on

Local

Currency

Portion

Foreig

n

Local

(1) (2) (3) (1x2) (1x3)


66/11kV

Substation electrical works TK

N-

580

23MVA, 66/11 kV Power Transformer

Dyn1+RTCC complete

Pc 1

TK

N-

590 66 kV Circuit Breaker complete

Pc 2

TK

N-

600 66 kV motorized Isolator without earth switch

Pc 3

TK

N-

610 66 kV motorized Isolator with Earth Switch

Pc 2

TK

N-

620 66 kV Current Transformer

Pc 6

TK

N-

630 66kV Voltage Transformer

Pc 6

TK

N-

640

Bus-bar material & conductors, all post insulators,

fittings & accessories

lot 1

TK

N-

650

All Substation Steel Structures, Marshalling kiosk

and outdoor panels.

lot 1

TK

N-

660

66 kV Surge Arresters complete with surge counter

& earth leakage meter.

Pc 6

TK

N-

670 66 kV Transformer Protection and control Panel

Pc 1

TK

N-

680 66 kV Line protection and Control Panel

Pc 1

TK

N-

690

11 kV Neutral Current Transformer with bridging

surge diverter

Pc 1

TK

N- 11kV Neutral Link Pc 1

of 20

700

TK

N-

710 11kV surge diverters complete

Pc 18

TK

N-

720

Auxiliary transformer 100 kVA, 3-phase,11/0.433

kV, with HV fuse protection

Pc 1

TK

N-

730

630mm2 single core XLPE 11kV copper cable &

terminations

M 500

TK

N-

740 Indoor terminations for 300mm2 11kV cable

Pc 4

TK

N-

750 Outdoor terminations for 300mm2 11kV cable

Pc 4

TK

N-

755 Laying of the 300mm2 3/c 11kV cable s

M 1000

TK

N-

760

Protection, control and measuring cables &

terminations & 70mm2 600V cables

Lot 1

TK

N-

770 433VAC supply & distribution board

Lot 1

TK

N-

780 110V DC battery & charger

Pc 1

TK

N-

790 48V DC battery & charger

Pc 1

TK

N-

800 Earthing system

Lot 1

TK

N-

810

Radio communication equipment & accessories

including mast/tower

Lot 1

TK

N-

820

Switchyard Lighting system including central

control panel

Lot 1

TK

N-

830 Lightning protection system

Lot 1

66 /11kV & LV Line Material

TK

N-

840 Civil works (hole digging)

Lot 1

TK

N-

850

Pole erection, stringing & termination of 11kV line

in 150mm2 ACSR

km 10

TK

N-

860

Pole Erection, stringing & termination of 66kV

line in 300mm2 AAA

km 20

TK LV transfers lot 1

of 20

N-

870

TK

N -

880

Up rating 11KV lines into concrete poles and

150mmsq conductor

Km 6

TK

N -

880

Dual construction of lines of 66 with 33 and 11Kv

(recover and reuse existing 33KV /11Kv

conductor.)

Km 3

Substation Civil Works

TK

N-

880 Switchgear building and other buildings

Lot 1

TK

N-

890 Transformer & structure foundations

Lot 1

TK

N-

900 Substation site stone fencing

Lot 1

TK

N-

910 Access road, Substation road and path walks

Lot 1

TK

N-

920 Excavation, backfilling & drainage works

Lot 1

TK

N-

930 Cable trenches

Lot 1

TK

N-

940

Substation ground

leveling/Compacting/Gravelling/Ballast

Lot 1

TK

N-

950 Office furniture

Lot 1

Telecommunications& SCADA

TK

N-

960

Installation and commissioning of SAS and

SCADA system

Lot 1

TK

N-

970

Installation and commissioning of OPGW

( 48core)

Lot 1

TOTAL (to Schedule No. 5. Grand Summary)

Name of Bidder

Signature of

Bidder

of 20

Schedule No. 5. Grand Summary

Item Description Total Price1

Foreign Local

Total Schedule No. 1. Plant, and Mandatory Spare

Parts Supplied from Abroad

Total Schedule No. 2. Plant, and Mandatory Spare

Parts Supplied from Within the Employer’s Country

Total Schedule No. 3. Design Services

Total Schedule No. 4. Installation and Other

Services

TOTAL (to Bid Form)

Name of Bidder

Signature of

Bidder

1 Specify currency in accordance with specifications in Bid Data Sheet under ITB 18.1 in Single Stage Bid,

or ITB 30.1 in Two Stage Bid. Create and use as many columns for Foreign Currency requirement as there

are foreign currencies

of 20

Schedule No. 6. Recommended Spare Parts

Item Description Qty. Unit Price Total Price

DDP

(foreign

parts)

EXW

(local parts)

(1) (2) (3) (1) x (2)

or(3)

Provide itemized list

Name of Bidder

Signature of Bidder

of 20

Appendix 2 Response to Written Enquiries

Sr.

Tender Reference Query Response

1. Price schedule sr. TKN-

220 & SLD

Quantity for 660Kv disconnector w/o Earth

switch is mentioned as three (3) nos. in

price schedule under sr. TKN-220. However

the same are Two (2) nos. as per Single

Line Diagram. Please clarify.

Number of 66kV motorized

disconnectors w/o earth switches is

3nos.Refer to modified SLD in

Volume 3.


350

We presume that 11kv, 3C X 300 sq.mm

cable from 11kv indoor switchgear and

auxiliary transformer is included in quantity

mentioned underprice schedule sr. TKN-

350. Kindly confirm.

The quantity is as stated under code

TKN-350 that is 1000metres of cable.

The auxiliary 100kVA 11/.433kV

transformer is to be feed from the

outdoor 11kV busbar.

3 Price Schedule TKN-330

& TKN-720

Size of Auxiliary 11/.433kV transformer Size amended to 100kVA 11/.433kV.


370 & TKN-710

Quality for 11kv surge arrester is mentioned

as 18nos in price schedule. However as per

SLD the same shall be 21nos. (18NOS. for

six nos. Feeders and three nos. for

transformer. Kindly confirm.

The number of 11kV surge diverters

is eighteen (18nos.) to be apportioned

as follows: 1)3nos. per outgoing

11kV feeder (4nos. 11kV feeders);

2)3nos for the auxiliary transformer

and 3) 3nos for the power

transformer.

5 Price schedule sr. TKN-

600 & TKN-610

In schedule-4 under sr. TKN-600 &TKN-

610, quality for 66kv disconnector is

mentioned as 1 pc each. However as per

schedule 1, the same are there & two nos.

respectively. Please clarify.

Correct the quantities as follows:- 1) TKN-600 3nos; 2) TKN-610 2nos.

This should be reflected in modified

SLD.


620

Quantity for 66kv CT is mentioned as 1 pc.

However as per scope & schedule -1 the

same shall be 6 nos. Please clarify.

Correct qty for TKN-620 is six

(6nos.).


630

Quantity for 66kv VT is mentioned as 3

pcs. However as per scope & schedule -1

the same shall be 6nos. Please clarify.

Correct qty for TKN-630 is six

(6nos.) as per modified SLD.

8 11kv cable installation 11kv 3C X 300sqmm cable is not including

in the schedule 4 for installation. We

presume that the cable laying & civil work

for the same is not in bidder’s scope. This

applies to 11kv cable from indoor

switchgear to auxiliary transformer as well.

Kindly confirm.

Amend schedule 4 as follows:-

TKN-755= laying of 300 sq.mm

(between indoor switchgear and line

termination tower)

TKN-740= Indoor terminations for

300mm2 11kV cable = Four (4Pcs.)

TKN-750 = Outdoor terminations for

300mm2 11kV cable = Four (4Pcs.)

9 50KVA auxiliary

transformer & 11kv indoor

switchgear.

We presume that 50KVA auxiliary

transformer will be fed through 11kv indoor

switchgear. However the same is not

indicated in SLD. 11KV switchgear panel

50kVA 11/.433kV auxiliary

transformer to be feed from outdoor

11kV busbar.

of 20

for auxiliary transformer is also not

included in SLD & price schedule. Please

clarify.

10 Price schedule sr. TKL-380

/390 of and price TKN-

740/750

Total six (6) nos. 11kv feeders are in scope

of work. However 11kv termination kits

mentioned against price schedule are 4pcs

each for door & outdoor purpose. Also

termination kits required for 11kv feeder for

auxiliary transformer are also missing.

Further there is quantity mismatch for 11kv

termination kits in price schedule 1 & 4

Kindly confirm the requirement of

termination kit for 11kv 3C X 300sqmm

cable

Number of 11kV feeders is four

(4Nos.)

Quantity for TKN-740 & 750

amended as stated above in response

no.7.

11. Soil investigation report Kindly furnish soil investigation report

along with soil resistivity for civil

&earthing estimation. As price schedule

does not contain any separate item for these

services, we presume that the same are

excluded from bidder’s scope.

Please refer to Volume 2 Para

6.1.1.6.1 of the Bid document.

Bidders are required to include all

costs for civil works in the provided

Schedule 4.

12 Technical data sheet Employer’s requirement for following

equipment is missing in technical data

sheets provided with tender document-

-Busbar& connections / post / tension &

suspension insulator/ indoor switchgear/

power Transformer/ Distribution

transformer.

Kindly furnish revised technical data sheets

for above mentioned equipment.

Please refer to section 6, Technical

Schedules, Volume 2 of the Bid

document for detailed specifications

for the 66/11kV power transformer,

post insulators, indoor switchgear,

100kVA auxiliary transformer and

tension/suspension insulators.

13 GA & electrical layout

plan & elevation drawing

Only SLD has been provided with tender

document. Kindly furnish GA with details

such as plot size, control building location,

road layout etc and electrical layout plan &

elevation drawings.

These drawings are necessary for electrical.

Civil & structural quantity assessments.

This is a turnkey project and bidders

are expected to develop a design for

the Works detailed in the scope of

works, install and commission the

Works.

Bidders are required to submit in

their bids provisional layouts in

conformity with Employer’s

requirement as detailed in Volume 2

of the Bid document.

14 Current Transformer ratio

details

Core wise details such as current ratio, knee

point voltage, exciting current, burden etc

for 66kv & 11kv CTs are not mentioned in

SLD or technical data sheets. Kindly

furnish the same.

Refer to Volume 2 of the Bid

document i.e. Para 4.1.1.10.9 and

4.1.1.13.4 for specifications, size,

class and rating.

As stated in response no.12 above

bidders will be required to provide

of 20

calculations to show how the

CVT/CTs they propose to use in the

Works conform to employer’s

requirements.

15 66kv Bus bar As per SLD 66kv bus bar is in present

scope of work. Kindly confirm whether the

bus bar shall be rubular type supported by

66kv BPI or using flexible conductor strung

at bus gantries.

The 66 and 11kV outdoor busbars

will be of the tubular type only.

16 Building work Price schedule sr. TKN-880 states that

switchgear building & other building.

Kindly clarify what will be scope of work

under other buildings.

Further kindly furnish plan & elevation

drawings for switchgear building & any

other building involved in present scope of

work.

Refer to Volume 2, Para 6.1.1 of the

Bid document which clearly details

Employer’s requirements for civil

works. Bidders are expected to

provide a substation layout

arrangement in their bid submissions.

17. 66kv & 11kv pole Lines Kindly furnish installation arrangement

drawings for 66kv & 11kv Poles Lines

Refer to Volume 2, section VI.

This is a turnkey project and Bidders

are required to provide a detailed

design of the incomer 66 & 11kV

feeder lines with their bid.

18. Concrete Poles In price schedule three types of pole are

mentioned viz. 10M, 12M & 15M. We

presume that 15M poles are to be

considered for 66kv lines and 10M & 12M

poles for 11kv lines. Kindly confirm.

Refer to response no.16 above.

Our Ref 6/12/VOO/voo 23 - Kenya Power | kplc.co.ke · TKN- 66 kV Transformer Protection and ... (6...

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