Auxiliary DC Power Systems for Power Stations, Distribution & Transmission Substations
The function of a Auxiliary DC Power System in a substation is to provide a reliable and independent source of power for protection, control, monitoring and communications functions at the station, so that in the event of the loss of the primary supply the substation control systems that require energy to operate can still do so safely. Switching breakers is the first thing that comes to mind when someone says DC POWER SYSTEM in power utilities as the major loads connected to the DC system are the trip and close coils of circuit breakers.
There are some other typical loads that are also important when you are sizing your battery charger or DC UPS, such as
- Power supplies of electronic relay protection ( busbar differential protection, high speed distance protection..)
- Telecontrol systems, automation and signalling units,
- SCADA (Supervisory Control and Data Acquisition) system
- Measurement and monitoring units
- Disturbance Recorders (Generally installed at interconnectors with other authorities and major generation and renewable generation sites)
- Power transformers cooling fans
- Emergency access lighting and alarm systems
- Communication equipment ( microwave networks, VHF Radio repeaters sites…)
There are many considerations when designing a substation, but the main ones are:
Therefore any component in the substation should be selected with those features in mind.
Why Helios Power Solutions?
Our design and sales departments work together with consultants, electrical contractors and end-customers to provide a turnkey solution which will not only meet the immediate requirements but also future requirements.
All of our custom build systems are fully assembled in our factory by experienced manufacturing personnel enabling us to have 100% control over the final product.
Customer’s feedback, especially from the maintenance and engineering department has enriched our knowledge and improved significantly our designs and procedures over the years thus allowing us to address concerns such as poor retrofit installation, scalability, time-consuming maintenance and space restrictions.
As a result, Helios Power Solutions has consolidated its name in the Australasian region as one of the main engineering providers of Industrial DC Power and Backup Systems. We invite you to check out some of the Battery Charger Systems designed and integrate by HPS.
Main Components of a DC Power System
- VRLA Batteries ( Low maintenance Valve Regulated Lead Acid are usually used for this application)
- Battery Chargers ( We recommend using modular switch mode rectifier systems / DC UPS )
- DC to DC Converters
- DC to AC Inverters ( Also called DC to AC Converters)
- Battery Racks ( Can be internal or external depending on the specific requirements)
- Diodes for N+1 Redundancy Systems, normally deployed in terminal switching stations for protection and control ( 110V Battery Chargers & 220VDC Battery Chargers)
- Battery monitoring systems
- Maintenance bypass for critical AC loads
Modular & Redundant Battery Chargers For Six Electrical Substations In Bangladesh
At Helios, we had the opportunity to design, manufacture and test 6 Convection cooled & Modular 1+1 Redundancy 48V 50A Battery Chargers Systems which will be baking up the SCADA/EMS & Telecom NMS of the power Grid company of Bangladesh. Keep watching the video and find out our integrated and customizable DC Systems Solutions.
The dual voltage CAB907 is able to supply 110VDC and 24VDC output voltage in a 21U cabinet. This customized DC System was designed to power and backup the DC Auxiliary loads of a 110kV/33kV transmission substation of one of the electricity and generation companies in New Zealand.
This charging system comprises of 110VDC and a 24VDC charger each with its own controller and rectifier sub-rack configured for redundancy with CSB409 load output diodes and separate battery racks.
- 21U wall mount cabinet
- Two 3 Phase Mains Input
- Chargers configured for redundancy with output diodes
- 230VAC Cabinet Fan
- Remote monitoring and programming with a webpage interface
- SNMP v2.5 via Ethernet
- Email reporting
Switching Breakers in Medium Voltage Substations
The Sol Series Battery Charger system is an optimal solution for Power Utilities when the requirement is the protection of electrical substations.
The trip and close coils of circuit breakers in medium and high voltage substation are the main application of DC POWER SYSTEMS in electrical power utilities.
CAB733 is a 2.2kW 110VDC convection cooled float charger in a 12U 19” Wall Mount cabinet. The system comprises of a CXC HP controller, HV-ADIO unit, two 1.1kW 125VDC rectifiers in a SOL series 6U 19” rectifier rack with AC distribution and a 3U 19” DC distribution panel. Two CAN cables connect the controller to the rectifier rack and the rectifier rack to the HV-ADIO on a CAN communication bus.
- 2kW 110 VDC float Charger
- Two 1.1kW Hot Swappable rectifiers
- Fully programmable touch screen controller
- 12U 19” Wall Mount Cabinet
- Single Phase 230VAC input protected by surge protection monitored by the system
- 32A 2 pole Battery Breaker monitored by the system
- 32A DC Output Breaker monitored by the system
- DC High, Battery Low, AC Mains High/Low, Rectifier Fail, System Major Earth Fault and Controller Fail Programmable alarms on voltage free relay contacts
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