AC AND DC POWER SYSTEMS WITH BATTERY BACKUP
The power system to be backed up and the origin of power can be either direct current DC or alternating current AC. The energy storage is DC, stored in electrical batteries of different sizes and amounts depending on the required power during a specified time period.
MODULARISED DESIGN - CUSTOMIZED SOLUTIONS
The Elcon Power Systems (EPS) main components are rectifiers, batteries, converters and inverters that are installed in a system cabinet and controlled by the system controller. The main components as well as the outputs are modular. Thereby Elcon Power Systems are customized according to the customer’s requirements and expectations.
The modular MOSFET-based rectifiers use a high frequency switched mode conversion technology. The DC output is fully regulated and isolated from AC input. The DC output voltage can be any of the standard 24, 48, 110, 125 or 220 VDC, or modified to any other DC voltage.
The load level of the rectifier modules is determined by the system controller and the load is evenly distributed between the modules. Should one rectifier module fail, the load level is automatically increased for the remaining modules and an alarm is forwarded.
The rectifier modules are “hot swappable” and can be removed and installed without shutting down the power system. Thus, the modules can be replaced in less than a minute. The rectifier modules of the Elcon Power System are fully redundant compared to systems where one module acts as master and the rest of the modules as slaves.
Elcon Power Systems are very reliable with a mean time between failures of more than 40 years.
Download here the rectifier data sheet:
The power system has a battery backup to ensure proper equipment operation during power outages. The battery bank consists of one or several battery strings depending on the required capacity and backup time.
Available battery types:
- sealed lead acid
- flooded lead acid
- any other type.
The battery bank can be mounted in the system cabinet, in a battery cabinet, or in a separate battery room on battery racks.
Every battery string is equipped with a battery MCB or a switch fuse.
Converter modules allow multiple voltage outputs to be available from a single power system. Typical conversions are from 110 V to 24 V or from 110 V to 48 V.
The operation of AC voltages during outages can also be secured by equipping the system with inverter modules providing a pure sine wave AC supply. The AC backup solution uses the latest inverter technology, providing superior energy efficiency in a compact size. The twin sine innovation (TSI) technology eliminates all single point failures with full scalability: up to 32 modules in parallel.
A failure of the static switch in traditional inverter connection can bring down the whole AC system. The TSI technology replaces the traditional solution with a new technology where each module incorporates a triple conversion.
- hot swappable and exchangeable without shutting down the system
- transfer time 0 ms thanks to DPS controlled dynamic source switching from AC to DC and vice versa
- high efficiency of up to 96%, reducing operating costs.
Download here the inverter data sheet:
The system controller has a high-resolution touchscreen LCD display for system configuration. The system live signal data and system status can be viewed via the display. There is an integrated USB host for local firmware upgrades, configuration updates and system restoration. Modbus communication protocol enables supervision and communication of alarms and live analogue and digital signals using Modbus protocol.
The standard IP (Ingress Protection) enclosure rating of the system cabinet is 21 or optionally higher if required. The default cable entry is through the cabinet roof. Optionally, the cable entry can be through the cabinet bottom and the cabinet should usually be equipped with a plinth. To ensure proper cooling, all cabinets are equipped with at least two cooling fans. As option these cooling fans can be equipped with condition monitoring. The size of the system cabinet depends on the amount of equipment, two commonly used sizes are 2000 x 600 x 600 (H x W x D) and 2000 x 800 x 600 (H x W x D). In cases where the cabinet door must be smaller, the 2000 x 1000 x 600 (H x W x D) cabinet with two 500 mm doors is an alternative.
Alternative cabinet sizes and other options are available, including wall mounted cabinets and transparent cabinet doors.
OUTPUTS / DISTRIBUTION
The number of outputs and their size can be customized according to the customer’s requirements and expectations. In addition to voltage and current monitoring, the current leakage of the outputs can be supervised.
The OEZ DC miniature circuit breakers (MCB) are intended for over current protection of services and similar installations with rated currents from 0.2 A to125 A.
The DC distribution normally consists of 10…20 pcs 2 pole DC MCBs.
As option, switch fuses, fuse-links, cylindrical fuses or other types of fuses can be used to customize the distribution.
INDIVIDUAL OUTPUT EARTH FAULT MONITORING - LCM
The leakage current monitoring (LCM) unit indicates current differences (leakage current) between the incoming and outgoing current of the system output port. Each LCM unit has six independent measuring channels.
As standard, the AC supply of the system cabinets is equipped with AC surge protection devices.
- Condition monitoring of battery cabinet cooling fans
- Voltage transducers
- Low voltage disconnection (LVD) for batteries
- Low voltage disconnection (LVD) for load
- Cabinet temperature sensor
- Remote and continuous battery monitoring
- Remote and continuous power system condition monitoring and surveillance.
Traditional inverter connection with static switch
Inverter utilizing TSI technology