
Substation DC system
The main function of substation DC system is to ensure uninterrupted power supply for essential loads.
ensure uninterrupted power supply for essential loads
Problems and solutions

Problems
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Power outages
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LAB have a “memory effect”, which means that the battery must be completely discharged before charging
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Long charging time. On average, a full charge takes 8 to 10 hours
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Discharge depth without the service life reduction is less than 60% of the rated capacity
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Low power characteristics. On average, LAB can produce a continuous current of about 0,5 C. That means, that LAB with capacity of 100 A * h would provide the maximum continuous current of 50 A.
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The discharge curve of LAB is flat, and the battery voltage seriously depends on the charge level.
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Low charge efficiency of lead-acid batteries - 65-85%
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High self-discharge rate (up to 15% per month)
Solutions
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Providing and reserving power for in-house needs and power facilities. Instant switch to battery power when the mains voltage disappears.
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LIB are capable of charging at any charge level keeping the ability to return the full capacity
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Significantly shorter charging time. The standard charge mode is 1 hour, which significantly reduces the time of operational readiness after a full discharge.
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LIB allows up to 80% depth of discharge. Thus, with the same rated capacity, LIB can produce more power
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High power characteristics. LIB in normal mode can produce a current of 3 C. Thus, LIB with a capacity of 100 A * h would provide the maximum continuous current of 300 A. This advantage allows to significantly reduce the nominal capacity of LIB compared to LAB. Thus, when replacing the battery in a substation DC system, the initial cost of the power accumulating device on LIB is equal to the cost of a device on scab LAB, or even less.
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The discharge curve of LIB in the range from 100% to 20% of the charge is almost horizontal straight line, the battery voltage is nearly constant in that range
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High charge efficiency of LIB - 93-95%
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Low self-discharge rate (on average, 3% per month)

Problems
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A charging room is required - a hazardous production facility
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Inefficient monitoring of battery condition during operation
Solutions
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No charging room required (decommission of a hazardous production facility is possible)
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A built-in monitoring system (BMS) that monitors the status of each element's parameters and can transmit results). In case of emergency or critical situations, BMS sends a signal to the switch gear and disconnects the energy storage device from the load and network.

Problems
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Low energy density in LAB ⇒ high mass and large dimensions ⇒ need for work areas
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LAB require maintenance at a certain interval during operation (for example, monitoring the appearance, leveling the electrolyte level), which entails the need for maintenance personnel
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Accelerated LAB degradation ⇒ frequent battery replacement
Solutions
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Occupied area is reduced, no need for a room with exhaust ventilation. Thus, the battery may be placed almost at any room of a substation.
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LIB are sealed and do not require maintenance.
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LIB does not need to be replaced during the entire service life

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Composition of OOPT
- Rectifier charger
- Battery switchgear cabinet
- Battery and control cabinet
- DC board
- Operating current distribution cabinet
Charger | Manufacturer 1 | ||
---|---|---|---|
Charger type | |||
Operating temperature, С | |||
Storage device | |||
Cell type | |||
Maximum discharge current | |||
Peak discharge current (5 sec) | |||
Service life (DOD80%), cycles | |||
Module power, kW | |||
Execution | |||
Thermostatting | |||
Fire extinguishing system | |||
BMS | |||
Maximum battery voltage | |||
Balancing type | |||
Balancing current |
Individual approach
We are ready to develop a custom-tailored solution for each client and offer a flexible list of specifications for your project. You can choose the dimensions, charging and running time, and other specifications.
Projects
We also offer cooperation throughout the entire project life cycle — from energy audit to technical support, as well as beneficial financial cooperation.
Manager
Aleksey
Neshta
Our managers will be glad to answer your questions regarding purchase and cooperation.
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