Translated Technical Report.pdf

Technical report on the power supply of the El Retamal Dam Sheet 1 of 13

Complementary analysis to CILA-JUA-LPN-21-2023 for the “Rehabilitation and modernization of the lifting systems at Retamal Dam”, carried out by the company DUSGEM SA de CV.

Reynosa, Tamaulipas, October 2024.

TECHNICAL REPORT ON THE ELECTRICAL SUPPLIES OF THE EL

RETAMAL INTERNATIONAL DAM, LOCATED ON THE RIO BRAVO,

TAMAULIPAS.

Machine Translated by Google

Table of Contents.

Sheet 2 of 13

Stage 4

Figure 3. Diagram of the mechanisms and current power supply system of El Retamal Dam

VI. TECHNICAL REQUIREMENTS OF THE NEW LIFTING SYSTEM

Figure 6. List of components that make up the HPU in charge of the El Retamal Dam Modernization project

Photographs 2 and 3. Power line and three-phase transformer of the Mexican section

Stage 5

VII. DESCRIPTION OF THE PROPOSED ARRANGEMENT

Figure 7. Single-line diagram of the El Retamal Dam Modernization project

Stage 6

Figure 1. Diagram of the HPU system, showing two electric motors

Figure 3. Preliminary Short Circuit Values provided by the CFE

Photographs 4, 5 and 6. Main power supply boards and registers (Mexican section). .. 7

II. SCOPE

Photographs 7 and 8. Main power supply (US section)

VIII. CONCLUSIONS AND RECOMMENDATIONS

Technical report on the power supply of the El Retamal Dam

III. AIM

I. BACKGROUND

Photographs 9 and 10. Emergency plants, backup unit (US section). 8

V. SCOPE CONSIDERED IN THE MODERNIZATION STAGE

Stage 1

Stage 2

IV. DESCRIPTION OF THE EXISTING POWER SUPPLY SYSTEM

Figure 2. Single-line diagram of existing power supply (October 2024)

Stage 3

Photograph 1. General view of the El Retamal Dam, note the feeds coming from the ends

Figure 4. Diagram of the mechanisms and power supply system in charge of the El Retamal Dam Modernization project

PIIOl1CIDS,CGf!SHUCTION,SUPEP:'IISll,jf/llQNIAJESDEIH6UUIIIAESPt:CW..LIFT

Technical report on the power supply of the El Retamal Dam

Stage 2.

Commissioning of lifting systems: servomechanisms, support structures on concrete piles (chassis) and on the gate structure (lug), control panel and hydraulic power unit, inclinometer programming, power and control systems.

Executive designs of the lifting systems: servomechanisms, support structures on concrete piles

(chassis) and on the metal structure of the gate screen (lug), control panel and hydraulic power unit.

Stage 3.

Manufacturing of lifting systems: servomechanisms, support structures on concrete piles (chassis) and on the metal structure of the gate screen (lug), control panel and hydraulic power unit, including the procurement of power cables, accessories and supply pipes for the hydraulic power system.

REPORT ON THE MAIN FEED OF THE EL RETAMAL DAM, RIO BRAVO, TAMAULIPAS.

Stage 4.

I. BACKGROUND.

Assembly of lifting systems: servomechanisms, support structures on concrete piles (chassis) and on the metal structure of the gate screen (lug), control panel and hydraulic power unit, including supply pipes, complementary elements such as inclinometers, power wiring, control and accessories.

On September 1, 2023, the unit-price, fixed-time public works contract No. CILA-JUA-LPN-21-2023 was signed for the work described as the "Rehabilitation and modernization of the lifting systems of the

Retamal Dam floodgates." This contract includes several stages:

Stage 5.

Stage 1.

Dismantling of the previous systems consisting of rocker arm structures, cables, pulleys, and gearmotors, which will be moved to the side yard of the El Retamal Dam.

Development of the engineering for the implementation of the central gate lifting system, control panel, and hydraulic power unit.

Stage 6.

PIIOl1CIDS,CGf!SHUCTION,SUPEP:'IISll,jf/llQNIAJESDEIH6UUIIIAESPt:CW..LIFT

Sheet 3 of 13

G1 " G 1"

DO NOT SUBMERGE

CD

CD 1600 Us.

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During the engineering phase, the servomotors were designed to be capable of lifting the central gate and actuating all its movements without deformations, alterations, or variations. This was evident in the engineering developed, leading to the selection of a robust servomotor system with specific characteristics.

II. SCOPE.

Figure 1. Diagram of the HPU system, showing two electric motors.

We are currently in phase 3 of the modernization project, which involves the manufacture of a servo system, which will be driven by a HPU (Hydraulic Power Unit). This is connected to the control panel, which links the power supply with the data system to operate and control the movement of the gates, simultaneously performing the graphic identification to be displayed on the control panel.

The purpose of this document is to explain the scope of the contract for the power supply to the lifting system of the El Retamal Dam, which is currently being modernized.

III. OBJECTIVE.

To clarify and identify urgent modifications to the dam's electrical power system, as well as to demonstrate the current state of the systems, including panels, conductors, grounding systems, and others that clearly require maintenance. Also, to consider modernization efforts, especially to create optimal conditions for the dam's lifting system. Part of the main objective is to identify the procurement of specially manufactured elements, which must be carried out by CILA in both the Mexican and U.S. sections, along with other complementary work.

GD

Sheet 4 of 13

CID

i.e., Tt :a~!I' aa, 2.5~ ÿ

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Technical report on the power supply of the El Retamal Dam

34 k~

T~ ai.iflP

SA _j A.oome:ida CirE

3. Contracted load. This represents a demand of 25 KW, data provided for the representation of CILA in Reynosa.

Figure 2. Single-line diagram of existing power supply (October 2024).

This diagram was the result of surveys, reviews, visits, analyses, and inspections carried out at the facilities to determine the composition of the current system, since updated plans are not available.

1. Main power lines. Both the Mexican and U.S. sections are composed of 34.50 kV three-phase overhead lines, both with three-phase transformers with a nominal voltage of 220 volts.

2. Generators. That is, emergency generators are also configured for a nominal voltage of 220 volts and a maximum capacity of 30 kVA.

The main power supply considers the following:

IV. DESCRIPTION OF THE EXISTING POWER SUPPLY SYSTEM.

Sheet 5 of 13

'1 :!-~ h'l2.40-12(W utr..leu:!dikv ÿ

W ÿ

International Commission on Natural Resources T

Commission

Commission

International Commission of~

International Boundary and W aterInternational Commission on Water Limits

L_ I _ _j t

Water Comm1ss1on

Yo

Yo

Yo

Yo

Technical report on the power supply of the El Retamal Dam

IBCWCILA

Sheet 6 of 13

Yo

YoYo

International Boundary and Water

MEX Waters

MEX Water Limits

MEX Waters

Figure 3. Diagram of the mechanisms and current power supply system of El Retamal Dam

Photograph 1. General view of the El Retamal Dam, observe the feeds coming from the ends.

Photograph 2 and 3. Power line and three-phase transformer of the Mexican section.

r

34 KV W Transformer

Gate Central

Emergency Plant

River Flow

34 KV Transformer

Unea Principal Aerea emational Bou~d~ry and

Main Air Line

Emergency Plant

Fourth Dr. Control

Description:

Electrical Installations

----- Electrical/Mechanical Installations

Icc = 3.603 kA

Icc

The Mexican section's connection is 34.5 kV and the main substation nearby is the SE Parque Industrial

Colonial 138 kV. Consulting the short-circuit level in the document "Short Circuit Values of the General Distribution Networks 2026" published annually by the CFE Distribution Directorate, the characteristics of the electrical equipment of the HPU system were verified, having the following value.

= 3.675 kA

Figure 3. Preliminary Short Circuit Values provided by the CFE Below, some elements will be shown in their current state.

Photographs 4, 5 and 6. Main power supply boards and records (Mexican section).

Technical report on the power supply of the El Retamal Dam

North Gulf Reynosa

S.nco

Yo

3.008

Division

7.511

Gotto Norte Re"- 00

Number Subsb.cion

3F X/R

Maximum CC level 2024Capacity CC level mini ~ 202-4

Cone current (YCI.Jito {kA), and X/ R ratio

X/R

17.284

7.302

Golfo Norte Reynosa

Golfo Norte Reynosa

06-NRE-138-1

IF

MT

(kV) (kV)

Gelfo Norte Distribution Division Medium voltage short - circuit values in the RGD, corresponding to the year 2026

~Fttl#m_,., t NEJ«JrlfltJH

Tension Tension Aaimimo

Sheet 7 of 13

CFE

-MVA

Gotto Norte Reynosa

North Gulf Reynosa

North Gulf Reynosa

Golfo Norte Reynosa

North Gulf Reynosa

North Gulf Reynosa

Gotto Norte Reynosa

Gelfo Norte Reynosa

Yo

16.498 7,650 17,475

7,646 17,763

06-OR2-138-1

2,923 15,909Golfo Norte Reynosa

7,797 18,710

13.8

7,679 18,007

4.623 16.772

13.8

06-JRA-138 JARACHINA

3.653 17.234

8,766 15,820

06-DOR-138-1

8.598

2,990 17,010

7,562 17,600

06-PAl-138 PARDUE INDUSTRIAL RE' 06-PAl-138-1

7,928 17,860

06-MEX-138 MEXICO

16.196

13.8

7,328 15,559

3.555 18.064

13.8

2,948 16,861

06-JRA-138-2

7,655 17,387

06-DOR-138 DIAZ ORDAZ

3.603

06-PIC-138 COLONIAL INDUSTRIAL 06-PIC-138-1

7.881

7,677 18,303

7.276 18.254

8.042

34.5

06-MEX-138-1

8,503 14,452

13.8

17.207

06-JUZ-138 JUAREZ

3.675

17,746

13.806-JUZ-138-2

06-INO2-138 INDUSTRIAL DEL NDRTE 06-INO2-138-1

7.178 17.529

8,834 16,619

IF

17.060

06-PAl-138 PAROUE INDUSTRIAL RP 06-PA~1 38-2 3.458 16.294

7.217 18.260

18,495

34.5

06-NRE-136 NORTH

06-JUZ-138 JUAREZ

18.006

7,730 17,146

13.8

06-INO2-1 38 NORTH INDUSTRIAL 06 -INO2-138-2

30 14,183 14,831

8,009 17,903

13.8

3.053 17.350

7,686 16,432 1 7,831 17,423

7,506 16,733

Golfo Norte Reynosa

IF

34.5

7,588 17,942 7,692 18,554

06-NVP-138 NEW PROGRESS

06-JUZ-136-1

2,990 16,342

3.534 17.311

7,862 17,965

13.8

4.520

06-JRA-138 JARACHINA

34.5

7,366 16,158

18,785

12.t 4.611 16.4294.503 15.175

7,767 18,148

06-MEX-138 MEXICO

3.488

13.8

7,553 17,202

3.013 17.245

7.532

14,652 16,125 14,348 15,901 14,769 16,989

06-OR2-136 ORIZATLAN

7,699 18,156

06-MEX-138-2

3.571

15.604

13.8

7,516 16,875

06-JRA-138-1

7,545 17,167 1 7,662 17.9&1

3.069 18.037

138 17.205

Area

270 Gano Norte Reynosa

XIRXIR

AT

15.42606-NVP-138-1

Photographs 9 and 10. Emergency plants, backup unit (US section).

Photograph 7 and 8. Main power supply (US section).

The facilities at the American section are in slightly better condition; however, both have wire as their main conductor, which is due for replacement, and the cabinets and auxiliary systems show advanced oxidation. Insects and harmful fauna have affected much of the wire insulation, causing weakening, which could lead to a power failure.

Sheet 8 of 13

Water Comm1ss1on

International Boundary and Water 34 KV Transformer

Emergency Plant Emergency Plant

Fourth Dr. Control

W Transformer 34 KV

River Flow International Air Main Line

Bou~d~ry and

Main Air Line

Description:

Electrical Installations

In charge of Modernization

Electrical/Mechanical Installations

MEX Waters

MEX Water Limits

MEX Waters

International Commission of:}

Commission

Commission t

IBCWCILA

International Commission on Water Limits

Technical report on the power supply of the El Retamal Dam

International Commission on Water Limits

Sheet 9 of 13

"T

1. Manufacture and installation of a power and control panel (control unit for movement of the side gates and central gate) including the cabinet, push-button system for control and actuation of the mechanisms, accessories, computer, control panel and interface.

3. Power, including supply of signal cables from the control room to the existing mechanisms located at the rear upstream of the side gates. This includes new conduits, accessories and connections of the existing mechanism system with the new control system.

The contract that DUSGEM is developing for the modernization of lifting systems includes the following for the electrical part:

V. SCOPE CONSIDERED IN THE MODERNIZATION STAGE.

Figure 4. Diagram of the mechanisms and power supply system in charge of the El Retamal Dam Modernization project.

As mentioned, the original scope was to connect the new system (board) to the existing lateral mechanisms and to the HPU for the central gate system; however, the feed line capacity was revised and requires additional adjustments, which will be mentioned later.

2. Power supply from the control room to the HPU mechanisms for the central gate (everything within the control room, including wiring, routing, connection and programming from the original power supply of the previous system to the new control panel).

International Boundary and Water l

Accumulator security block

Gauge lsolaior

Level switch

Level gauge

Description

Technical report on the power supply of the El Retamal Dam

Mpnllli

RPEC-lWN

18 Return fUter

FT-290-114"

Hand pump

Mpflltrl

Hawe

Voss

Voss

Atos

Qty, Type 1

SBR10TCM000330CNZ0

Electrical Indication<

Electrical Indication

Oilseed oil

Garma

Garma

25HP 1750rpm, 60Hz 460V 83/8~

GCL001360

Pressure Transducer

Pressure Relief Valve

EM22V•G24 7749 0024-00,HW

GPL003782

212 Poppet Valve Normally Closed

Leduc

PGP511 A0270CS2D3NL212B1B1

FT26712-34

GLUAL

PISTER

Electric molor

Throttle Check Valve

Check Valve

Check Valve

Check Valve

Wlka

PT250R-2004-12-DA91

DLES0HA50P01

Gear Pump

Mpflltrl

Mpfiltri

RHD-20S

Separator Plate

MPflltrl

Tognella

Tognella

Tognella

Check Vallie

Manufacturer

D3W020BNJW

STR1003SG1M90P01

Cimberian

Mpfiltri

Mpfiltrl

2 Way Ball Valve

L VA30TVPM 12S01

2 Way Ball Valve

BKH-ON06-G 1 J4-11 2A

CMC000011 _ PT-100(4, .,20mA)_L=600mm Temperature Sensor

PVC-1-l=600 mm level switch

Commercial

RHD-20S

4/2 Direct Current Control Valve

CIM-16-1

STR0501SG1M90P0 1

PVC-1-L=SO0 m

Well, Breather desiccant

Sun

'212 Poppet Valve Normally Closed

PARKER

Sheet 10 of 13

Man~old

PM25S00 LPM270

BEA20HA50P01

Mpfillt1

EM42V

Parker

KQ-024

The servomechanisms and the HPU (Hydraulic Power Unit) include two electric motors within their components, as shown in diagram number 1, both are used to move the gate and these operate independently, that is, one will be a backup for the other, its drive will also be independent, both mobilize the hydraulic system, these according to the calculations resulted in 25 HP of power each, the HPU component table is attached.

VI. TECHNICAL REQUIREMENTS OF THE NEW LIFTING SYSTEM.

Figure 6. List of components that make up the HPU in charge of the El Retamal Dam Modernization project.

63-MM-EV-250

Pressure Filler

Voss

AKA 13FS200Z4S

MPF1811AG1A25HBP01

Pressure gauge

Suction filler

RHD-25S

CFI000010

Hawe

Regglana

FT26716-12

Accumulator

Support coupling

Tank and components

FMP 1352BAG2A25NP01

Throttle valve

Hans Turck

ABVE 50 (066890)

GLUAL

GLUAL

GLUAL

Parker

Suction Qlter

Technical report on the power supply of the El Retamal Dam Sheet 11 of 13

3. Supply and install two 3x100 AMP safety switches for both sections after the transformer connection point.

4. Supply and install 3-wire feeds of 1/0 AWG cable, 1 wire of 1/0 AWG cable and 1 wire in # 4 bare copper cable channeled with 2" diameter conduit pipe for both sections, from transformers to double-throw transfer, for both sections, as well as a 3x150 AMP protected switch. At this point, changes must be made to the generator equipment to operate at 480 volts and provide major service to the plants.

5. Supply and install after double throw transfer safety switch 3x150 AMP for both sections.

6. Supply and install feeds of 3 wires of # 2 AWG cable, 1 wire of # 2 AWG cable and 1 wire in bare copper cable of # 6 channeled with 2” diameter Conduit pipe for both sections, from the double-throw transfer to a 30-pole NF30 distribution board, for both sections, these boards are also recorded as new elements (approximately 85 linear meters of feed).

The installation of the mechanical components, namely the servomotors, HPU hydraulic power unit and the control panel, will begin in approximately 5 weeks. Therefore, the following action plan has been developed, which considers the following, for the part not covered within the modernization contract:

2. Supply and install 75 KVA (34,500 / 480-277 VAC) three-phase Delta Star type transformers for both sections.

1. Supply and install 3x5 AMP fuses as primary protection on the transformer bases for both sections.

VII. DESCRIPTION OF THE PROPOSED ARRANGEMENT.

7. After the distribution board, the supply and installation of a feed (approximately 15 linear meters) is considered, consisting of 3 wires of # 6 AWG cable, 1 wire of # 6 AWG cable and 1 wire of bare copper cable of # 8 channeled through 1-1/2” diameter Conduit pipe, for both sections.

8. Supply and install 30 KVA (34,500/480-) three-phase dry-type transformers

9. After the dry transformers, the supply and installation of a feed (approximately 10 linear meters) of 3 #

4 AWG cable wires, 1 # 4 AWG cable wire and 1 # 6 bare copper cable wire channeled with 1-1/2” diameter Conduit pipe is considered for both sections.

10. After the distribution board (point 7), the supply and installation of power (85 linear meters) is considered, consisting of 3 wires of #2 AWG cable, 1 wire of #2 AWG cable and 1 wire of bare copper cable of #6 channeled through 1-1/2” diameter Conduit pipe, for both sections.

220-127 VAC) for both power supplies. (These will be rated at a nominal voltage of 220 volts, in accordance with the rest of the installations, including lighting, outlets, and air conditioning.)

EOU)()R

A.COMETIOA CFE 3X34.5 KV

Sheet 12 of 13 l·#ICUD(TF}

POST

F\JSISlES----

In charge of Modernization of the

Electrical/ Mechanical Installations

Description:

ElectricalNew arrangement facilities .

3X40AMP

T•I-V2'°0

~mo

480VA.C

3-f4AWG(Fl

1-CUOi 4 TF

480VAC

1-A.\YGII/ON

JOPOI.OS tE30

3- 11.0ASCR CA6t.EAOOOECFE

)..AWG • I

CABlEAOOOECFE 3- #IMASCR

RIFLES

1-IIIBCUO(TF) s

1-112"0

T~OOtsTRIBUTION

NEW.3R

480VAC

NBM lR

3X 1!!IOA.W'

TRANSF'OR.MAOOR ·nPO OEl

TA STAR MULPHASIC 75

KVA 3'1.e00 J480-2nVAt.

~1/.,) m, 1.1Se,AWG (N)

-~u..-~

Technical report on the power supply of the El Retamal Dam

I-080.JD (TF)

BETTER~

JX, A.YP

CCM

---®--1 ~•WG• t/0

T•?'O and

15m .MS 3- •

0AWG(')

85m rr,e.HS

3-12AWG (F) l•

• .,AW1/GN ) 15miinNln •• dcuocm

TR.AHSFORMAOOR • OELTA TYPE -~~ A ESTRELI...A.

TIUFASIC075KVA J4-'00 l 440-2"V,A,C

3-f2AWG (F) 1· •

2 AWG (N} 1- •

eCUO(TF)

USA

4EICIVAC

450-2n VAC

T•Z'B

480VN:.

3X-40AMP

3X15DAMP3Xl!'IOAMP

T•l•11Z"£1

3X70NJ,P220VN:.

ex,smne

3X. 70ANP210VAC

EXISTENT

As indicated in section V, the scope of the contract may be adjusted to the new arrangement, identified within the purple polygon. For the remaining items, if necessary, written authorization is required. It is understood that modifications must be reconciled as unforeseen and additional items. We note that these are being quantified and valued. The technical and financial proposal for these items will be sent via email.

Additionally, the steps to be taken to replace the transformers are actions that must be promoted by the

Mexican and American branches and are dependent on different agencies and authorities.

Figure 7. Single-line diagram of the El Retamal Dam Modernization project.

The diagram developed with the basic information of the feeding proposal is attached below:

ZHP

lQkW

Z?OVAC

480-m VAC

NEIAAJR

IITTERRUPTOR_/ ! ~~oor

C NEMAJR

1.AWG IIO

Ga<ERAOOR El.ECTRJCO ElUSTEHTE 30 KV G er:] TRAHSFER!at<CIASOE 0061.ETIRO [YJ

T• 1-112'"0

POST

TZ-0

1-Cml • TF

3X \50.AMP

3X tOOAMf~

J CONNECTION SECTION 3X34 5KV :r A.

\1ERTCANA

220 1127VAC

T"91.ERO OISTRll!UTION

:220 / 127VAC

1-#4 AWG(N) 1-

f0CUD(TF}

Technical report on the power supply of the El Retamal Dam Sheet 13 of 13

VIII. CONCLUSIONS AND RECOMMENDATIONS.

• Different alternatives have been analyzed and explored for the use of the optimal nominal voltage, including the normal voltage of 220 volts currently used, both in the main feeds and in the emergency, transfer and supplementary plants. However, using this nominal voltage would generate greater energy consumption after the inclusion of the HPU (Hydraulic Power Unit) electric motors.

Procurement and additional installation work is estimated to take 6 to 8 weeks, depending on supplies.

I inform you that the company is fully prepared to jointly carry out the necessary actions to successfully complete the modernization contract. Resources will be allocated to address these additional works, pending approval.

• While some of the feeds are currently undergoing modernization, we consider it appropriate to additionally modernize the main transformers, switchboards, transfers, conduits, and existing conductors, since we are in this process and the condition of some elements can be classified as operational with their integrity in reserve.

• The most prudent alternative is to integrate the three-phase power system with a nominal voltage of 480 volts without having to adapt the main lines, i.e., the overhead lines, significantly optimizing electrical consumption and even regulating variations in the main system within the El Retamal

Dam.

• In the case of generators, they have been inspected and, according to the manufacturer's data, can be migrated from 220 volts to 480 volts of nominal power, making minimal adjustments, generating the necessary compatibility with the new electrical panel, taking advantage of these elements.