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MEDIUM VOLTAGE GENSET FOR COAZTACOALCOS TUNNEL

www.genesalenergy.com


MEDIUM VOLTAGE GENSET COATZACOALCOS (MEXICO)

PROJECT NAME

Medium voltage genset for Coaztacoalcos tunnel

POWER

2188/2407 kVAs

TYPE

Open (No canopy)

SPECIAL CONFIG

Medium voltage 13.2 kVA with measurement cells and an external grounding switch as well as transfer cells between the genset and the network with power restoration without a zero crossing

On February 13th, 2017, the GENESAL ENERGY specially built Genset with 2407 kVA in emergency at 13.2 kVA, arrived in Mexico, to give support and back-up to the underwater tunnel in the city of Coaztacoalcos (Veracruz). The submerged Coaztacoalcos tunnel (length 2280 metres) has been built to communicate the central urban nucleus of Coaztacoalcos (one of Mexico’s most important industrial areas) with the Allende neighbourhood, which in recent years has become the home of numerous petro-chemical companies. The construction of the tunnel ($250M), the first in the country and in Latin America of these characteristics, consists of a pre-moulded reinforced concrete. It was set into place in the river piece by piece and subsequently joined together in-situ using the immersed tunnel method. The supply, installation and start-up of the genset has been coordinated with the GENESAL ENERGY Mexican subsidiary, who for many years have been prominent in the growth of the energy sector in Mexico.


MEDIUM VOLTAGE GENSET COATZACOALCOS (MEXICO)

PROJECT OVERVIEW Medium voltage open genset at 13.2kVA with measurement cells and an external grounding switch as well as transfer cells between the genset and the network. The genset operates in SPtM (Single Parallel to Mains) with automatic start-up in case of grid failure.

PROJECT DESCRIPTION The Coaztacoalcos Tunnel has been built using equipment powered by low and medium voltage sources. In order to provide medium voltage emergency power, it was decided to directly install a medium voltage genset, with no intermediary transformer, and to power critical loads within the tunnel. In the design phase, a genset with 2407kVa standby power at 13.2Kv was chosen. One of the requirements involved the genset starting up automatically in case of a power grid failure, and when power returns to the grid synchronizing and then gradually returning all loads to the network without any noticeable change in the original power supply source. The client has a separate room for the genset, and a separate room prepared with a raised access floor to store the medium voltage cells for measurement and transfer.


MEDIUM VOLTAGE GENSET COATZACOALCOS (MEXICO)

SOLUTION GENESAL ENERGY was not only responsible for designing the genset, but also the room where the genset would be installed, taking in to account the dimensional limits set by the client. The fuel tank was also installed in the same installation room as the gesnet, with a fuel maximum of 3000 L, providing the genset with up to 6 hours’ autonomy. The control of the genset was split in to various parts: Control panel: Containing all the elements necessary for the control of the genset and all its operations. Measurement cell and earthing: Power cables are received from the alternator permitting the measurement of intensity and generated voltage. One of the cells makes the star type connection with the alternator windings and contains a ground switch for the generator neutral connection. Transfer Cells: Responsible for the switching between grid power and the genset power. All the equipment is connected to the control panel of the genset using dedicated channels, separating the power circuits from the control circuits. The entry of power cables is done through the lower part of the control panel, while the signal entry is in the top half.


MEDIUM VOLTAGE GENSET COATZACOALCOS (MEXICO)

SOLUTION An network synchronizer/analyser has been installed in the control panel allowing for full control of the engine and the generator. A PLC is used to apply logical control to running of the genset, applying the following modes of operational functionality. 1. Manual: All the instruction given to the genset are given manually. A safety control system has been designed to avoid accidents or risks during genset use, only permitting the opening and closing of circuit breakers in safe conditions. • Genset Stop/Start: Only possible from the control panel. • The opening and closing of circuit breakers can be done by manual operation or remote operation. Manual: - Via the control panel found in the genset - Using the actual circuit breaker switches Remoto: - From the users control room via a cable connected to the circuit breakers on the genset - Using ModBus TCP/IP communication between the control room of the user and the actual genset.

2. Automatic: External control and instructions are disabled, meaning only a loss of grid power will start-up the genset. A loss of grid power therefore puts the genset into operation and it provides the energy required for the loads. Once grid power is re-established the genset and grid power synchronize, closing the network circuit breaker and commencing discharge. Once the genset has discharged its load, the genset, switch opens leaving the load to be fed by the network power. The heating system for the genset has been designed to maintain the optimum operational temperature, whilst ensuring low network energy consumption, due to the exterior grid operating at limited output. Due to the size of the genset, it was not feasible to assemble the standard radiator on the steel frame, as its size prevented it from being transported in a 40’HC container. A specialised genset was built to meet the criteria with respect to cooling, whilst also permitting its assembly on the steel frame and consequently reducing significantly the gensets installation in this complex project.


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