Protection & Control
Schneider Electric support forum about Protection Relays, Substation Controllers & RTUs, Arc Flash Devices & Systems in Medium Voltage and Low Voltage. A place to get support on product selection, installation, commissioning and troubleshooting.
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PS50 secure power supply is playing a real key role in Easergy T300 solution, as it ensures that the system is available at any time, especially when Mains power source is down.
One of the main functions is to charge the battery when mains is present, and to monitor periodically the battery status very precisely.
Thereby the Control Center is warned when battery needs to be replaced, so ensuring the Remote Terminal Unit will be operational in case of a later electrical fault on Medium Voltage distribution network.
Hereafter is a description of how all this works
The PS50 power supply unit supplies the back-up operating voltages for
Each output is separately protected, and PS50 ensures a 10kV insulation from LV input.
A battery ensures the operation of the whole substation in the event of loss of the mains supply. The power supply unit ensures its charge and monitoring (regulated and temperature-compensated charger).
Battery end of life detection is achieved through a periodic test every 12 hours, measuring battery internal resistance, and issuing alert in case of 2 successive failures.
The product is communicating with HU250 head unit using Modbus protocol, so enabling to collect the results and to warn Control Center for battery replacement.
PS50 and associated battery ensures backup capability for a control and monitoring system of an MV Equipment up to 16 MV functions.
E.g. it will supply power to following modules for several hours after loss of mains:
Actual expected autonomy may be calculated using the excel autonomy calculation sheet.
Two commercial references are available to address two voltage level for MW switch motorization:
Product Name |
Commercial reference |
Commercial designation |
PS50-24V |
EMS58587 |
Back-up Power supply - 12V, 24V output |
PS50-48V |
EMS58588 |
Back-up Power supply - 12V, 48V output |
PS50 settings may be adjusted through HU250 webserver.
Regarding the battery, the charger permanently maintains the battery in the range of voltage and current specified by the battery manufacturer, as follows:
Note: By default, all the settings are set to the values provided by Yuasa for SWL and NPL batteries.
(e.g. 3mV/°C/cell for temperature compensation)
Posted: 2020-03-09 07:59 AM
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Hello @jean-luc_batard,
Thank you for sharing this useful information with the community. 🙂
Have a nice day.
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Posted: 2020-03-09 07:59 AM
Link copied. Please paste this link to share this article on your social media post.
Hello @jean-luc_batard,
Thank you for sharing this useful information with the community. 🙂
Have a nice day.
Link copied. Please paste this link to share this article on your social media post.
Thank you very much for sharing this information!
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