SDFA minimizes feeder down time by quickly and automatically restoring operation to serviceable feeder sections, while isolating those requiring repair. This results in minimal outage time, fewer service calls, and reduced monitoring and management demands.
Siemens vision was to create a peer-to-peer, model-based solution according to smart grid standards established by the Department of Energy (DOE) and the National Institute of Standards and Technology (NIST). SDFA was the result. In its simplest configuration, SDFA consists of two or more Automation Controllers and a high-speed, IP-based network that allows for IEC 61850 peer-to-peer communications between controllers. Optional system components include all types of switchgear, wireless communications system, and PC-based and substation-hardened Human Machine Interfaces (HMI).
Siemens offers SDFA as a drop-into-place, turnkey solution, including system design, supply, configuration and site testing. Siemens can also help utilities with the planning, design, supply, configuration and testing of your communications system.
Siemens Distribution Feeder Automation - Restoring power to communities in the blink of an eye
SDFA makes the grid more reliable
Rapid FLISR for minimal outage time
Scalable for maximum cost effectiveness
Decentralized, peer-to-peer architecture, no master required
Easily integrates into SCADA network
Standardized IEC 61850 & DNP3 protocol
Multiple control points
Advanced monitoring functions
Load balancing and monitoring
Critical-load transfer schemes
Fail-safe remote and manual operation
Simulation mode for offline testing and configuration
Sequential logic programming for precise operation
One software package programs logic
Turnkey solution from primary switch to automation
Each system thoroughly tested before shipping
Siemens Distribution Feeder Automation (SDFA) is extremely fast. Using differential current measurements and IEC 61850’s native peer-to-peer communications capability, SDFA quickly detects faults or loss of power and switches to an alternate power source in as little as 6 cycles. This is fast enough to prevent motor loads from losing synchronization when switching power sources. In addition, an SDFA-ATS solution can be implemented using standard recloser switchgear. When compared to alternative ATS solutions, an SDFA system can result in significant cost savings in both design and construction.
Reclosers and sectionalizers use a trial and error process of over-current measurements, time delays and Time Coordination Curves (TCC) to protect, locate and isolate faults. And in the restoration sequence, reclosers may use additional voltage sensors when backfilling power which adds cost. SDFA operates differently. Using differential current measurements, SDFA quickly detects the precise location of a fault in about 100 milliseconds (via wireless communications) then sectionalizes just the faulted section. It then restores power to the unfaulted sections via the alternate power source, up to the point of its rated capacity. The result is a highly selective, ultra-fast isolation and restoration scheme that employs fewer switching operations and reduces equipment stress. In addition, differential current measurements greatly simplifies the upfront engineering that would be needed with multiple normally-open points. And while it is possible to use SDFA Automation Controllers for both the protection and the isolation and restoration functions, utilities can still deploy our SDFA Automation Controllers using conventional recloser-type protection schemes, while retaining SDFA’s isolate and restore logic after recloser lockout. This gives utilities an opportunity to test SDFA’s protection logic in stages before migrating to full Smart Grid functionality in the future.
Flexible configurationQuick, automated restorationMultiple communication optionsUse of any standard recloserSmall footprintIntegrated 7SC80 automation controller for local controlProtects critical loads
The 7SJ80 Automation Controller can be used both in the distribution substation as well in poletop applications.
The Siemens Distribution Recloser (SDR) is used in three-phase operation when integrated into an SDFA system. The SDR Three-Phase Recloser is available in ratings of 15.5 kV, 27.6 kV and 38 kV with a continuous current rating of 630 A or 800 A.
SICAM PAS is a windows-based Data Concentrator and HMI that can be installed in the substation or enterprise and is used for archiving alarms and events, report generation, fault record retrieval, integration with substation devices, protocol translation and reporting to SCADA.
The 7SC80 Automation Controller represents our newest line of Automation Controller designed specifically for high-performance Distribution Automation applications in poletop environments.
The Bridges ElectricTM Vector® Series Switch is a price-competitive, three-phase loadbreak switch that is available in ratings of 15/25 kV and 38 kV, 150 kV BIL and 200 kV BIL, 900 A or 1,200 A continuous current and 600 A or 900 A loadbreak.
7SJ64 Substation-hardened HMI is a low-cost alternative to the SICAM PAS for basic HMI and monitoring and control functions. The 7SJ64 can link to RTUs and substation logic via binary inputs and outputs.
SDFA is currently sold as a turnkey system for both greenfield as well as brownfield installations. To ensure a successful deployment, all turnkey systems are completely configured and tested in the Siemens Smart Grid Laboratory in Wendell, N.C. As part of the standard deliverable for system engineering and testing, Siemens will also analyze the customer’s communication network to ensure system performance.
In addition, Siemens offers a full range of system support for products and services used in the installation, including on-site and factory support, product documentation, accessories, and training programs.
SDFA Automation Controllers
Factory Acceptance Test (FAT)
Protection and planning studies
Recloser and switch primary switchgear (greenfield installations)
Primary switchgear manufacturing and assembly (greenfield installations)
Substation-hardened or PC-based Human Machine Interface (HMI)
Field installation assistance
Communication system testing
Site Acceptance Test (SAT)
Customer support & training
Sales and QuotationsFor more information on SDFA solutions or to obtain a quote in the USA, contact Dan Murray at +1 (408) 687-9134.
Product SupportFor after-the-sale support in the USA on SDFA products and solutions, please contact Customer Care at +1 (877) 217-4943.
Orangeburg Department of Public Utilities installed a Siemens Distribution Feeder Automation Automatic Transfer System (SDFA-ATS) to supply reliable power to an Ibuprofen plant, an anchor of the economy in the Orangeburg area. Its 10-megawatt load is the largest among roughly 25,000 retail customers Orangeburg DPU serves.
A&N Electric Cooperative successfully deployed an ultra high-speed Siemens Distribution Feeder Automation (SDFA) system that improves service reliability for the only hospital serving the eastern shore of Virginia: Riverside Shore Memorial Hospital in Nassawadox, Virginia. The system detects a fault, isolates the problem and transfers to alternative power sources in less than a blink of an eye.
Wake Electric Cooperative implemented a SDFA system that provides source-transfer functionality to all line sections with sequences executed within a quarter of a second and FLISR sequences executed in less than a half second. The system uses a jDiff protection function to locate and isolate faults on line sections, which eliminated the need for traditional complex coordinated overcurrent schemes.