Auxiliary DC power system The auxiliary DC power system consisting of a charger, battery bank, DC distribution system and monitoring system is an important part of the primary / secondary substation. It is directly related to the fault detection mechanism, trip coil operation, remote operation, etc. This article focuses on the basic aspects of the optimal size of the 110V DC charger and power supply system for a typical MV distribution substation. 110V (auxiliary power source used in primary / secondary substation) for MV panels The auxiliary DC source used in the substation power stations usually operates at voltage of 110V or 220V, with some exceptions. To design a complete auxiliary DC supply system for a substation, a design engineer must go through multiple calculations and reflections, and through this article, readers can get an idea for designing and assembling a complete auxiliary DC supply system at a voltage of 110V to get a typical MV power of a substation distribution through Consider multiple factors such as – battery bank size, DC load calculation, battery charger rating, DC power distribution board size and rating, etc. Substations The main factors for determining the size of the battery The nature of the substations loads and their effect on the battery size The effect of the battery type on the size of the DC charger Factors affecting the size of the battery charger How to calculate the size of the battery bank in the auxiliary DC power system? Calculation sample for battery bank size Decision related to charger selection 1. Provide a typical 110V DC auxiliary power supply for an ion substation. Auxiliary DC power supply is required at a substation to ensure vital equipment remains in continuous operation even during primary AC outages. When the circuit breaker is opened to interrupt the power supply in the radial feeder, this results in a power failure to the circuit breaker itself, and thus, the circuit breaker cannot be electrically closed unless an additional power source is available that ensures that the breaker can still operate when the power supply is cut off. Main, and for this, a battery bank stores power with the help of a suitable charger and supplies DC loads continuously or during power outages via a DC system under proper monitoring and control Requirements: Premium membership required This article / technical guide requires premium membership. Get access to all premium HV / MV / LV technical articles, electrical engineering guides, and papers. Check the benefits of each plan and choose the membership plan that works best for you or your organization. You can choose the Plus, Pro, or Enterprise membership plan on a yearly basis. – Get 15% off Pro plan, use discount code: ZX21FLog InSign Up related EEP content with sponsored links
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