Siemens Distribution Feeder Automation System (SDFA-DC)Scalable high-speed feeder automation solution for unattended service restoration

Features

nRapid FLISR for minimal outage time

nScalable for maximum cost effectiveness

nDecentralized peer-to-peer architecture, no master required

nEasily integrates into SCADA networks

nStandardized IEC 61850 & DNP3 protocols

nMultiple control points

nAdvanced monitoring functions

nLoad balancing and monitoring

nCritical-load transfer schemes

nFailsafe remote and manual operation

nSimulation mode for offline testing and configuration

nSequential logic programming for precise operation

nOne software package programs logic

nTurnkey solution from primary switch to automation

nEach system thoroughly tested before shipping The Siemens Distribution Feeder Automation System (SDFA-DC) restores service to unfaulted sections of distribution feeder lines—with or without operator intervention.

In the event of a line fault, the system rapidly identifies the fault location and attempts to re-establish service over the line. If the fault condition has cleared, the distribution feeder returns to normal operation. If the fault condition does not clear within a utility-specified amount of time or number of restoration attempts, the system isolates the faulted section and restores service to operable sections of the line.

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Siemens distribution feeder automation system

The Siemens Distribution Feeder Automation System minimizes feeder down time by quickly and automatically restoring operation to serviceable feeder sections, while isolating those requiring repair. This results in minimal outfewer service calls, and reduced monitoring and management demands. How it works In the traditional approach, a utility typically receives a fault notification fromcustomer experiencing an outage. The trouble desk would then dispatch personnel to locate and isolate the fault, restore service to unaffected sectionsline, and repair any damage prior to returning the feeder to normal opThe Siemens Distribution Feeder Automation System automates the fault detection, location, and isolation tasks automatically restores service to viable sections of line, thus minimizing outage time and dispatch expenses.

Type SDR Recloser

Type Vector Switch

Type 7SJ80 Protective Relay

To accomplish these tasks, pole-mounted intelligent protective relays control automated sectionalizing switches, circuit breakers, and reclosers located along the feeder (Fig. 5). Each feeder section contains a relay with a powerful programmable logic controller (PLC) that can be easily configured by the utility to operate the switching devices in response to local or network conditions. Because the relays communicate with each other in a peer-to-peer fashion, the system operates autonomously with no need for a master controller. Rapid fault detection Fault detection is accomplished using high speed differential equations residing within each PLC. Each sectionalizing switch or recloser contains a current sensor that continuously supplies line current data to the relay in each adjacent feeder section. When a current spike, or “jump,” occurs along the feeder, the relay in each affected section receives information about the jump and compares it to the line current conditions in the adjacent sections. If a comparison yields a current differential exceeding utility-defined parameters, the affected relay issues a fault notification to all other devices in the system. Fault detection occurs quickly—in a system with WiMAX-connected relays, problems are detected in less than 100 ms. Fault isolation and service restoration When a fault is detected, the system will cycle the circuit breaker or recloser located immediately upstream of the fault in an attempt to maintain full distribution feeder service. If service cannot be restored within a predetermined number of reclose attempts, the system will lock out the affected breaker or recloser and open the switching device (if not already open as the feeder open point) located immediately downstream of the fault to isolate the affected section. Once the faulted section is isolated, the system will close unaffected switching devices as necessary to maintain service on all serviceable sections of line. Simple switching logic The fault isolation and service restoration tasks are performed according to simple sequential switching logic programmed into every PLC (Fig. 2). Each PLC contains multiple AND gates that perform switching steps, which when combined, create logical sequences that control the isolation and restoration processes. Sequences for load balancing and load transfer can also be programmed. Thus, the system has complete flexibility to execute desired sequences based on operating mode, fault information, and system status as combined

Fig. 1. Control center PC-based HMI

Fig. 2. Sequential switching logic

< 0.4 sec

P1 Circuit Breaker

State 0 - Normal

State 1 - Restoration Open P3

State 1 - Fault P4-P5 Open P5

State 2 - Restoration Close P1

State 2 - Fault P4-P5 Open P4

State 3 - Restoration Close P4

State 3 - Fault P4-P5 Close P3

State 4 - Restoration Service Restored

Faul

t Iso

latio

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State 4 - Fault P4-P5 Fault Isolated

P5 Circuit Breaker

P2 Recloser

P3 Recloser

P4 Recloser

< 0.3 sec

simply at a single AND gate. PLC programming is easily accomplished using the Siemens DIGSI software package and a graphical tool supplied as part of the system. Event storage and recall To facilitate evaluation of distribution feeder operation, each relay stores recent system status and operational data for recall by a laptop or PC. Specific events and conditions can be reviewed using eight oscillographic screens that each log up to 200 events, thus permitting in-depth analysis of feeder performance. Flexible configurations Siemens Distribution Feeder Automation Systems can be configured to include circuit breakers, reclosers, and automated sectionalizing switches, alone or in combination (Fig. 3). The system works with an unlimited number of switchgroups containing up to 20 devices. As part of a turnkey solution, Siemens can provide a full range of automated primary switches, including SDV7 outdoor circuit breakers, SDR reclosers, and Bridges Electric Vector overhead switches.

Fig. 4. 7SJ64 control panel

Each switch is equipped with a Siemens 7SJ80 controller that can be hard wired to current and voltage sensors and transformers, and status and alarm contacts on the switches. The 7SJ80 controller is also used in conjunction with reclosers, along with a recloser protection relay. The controller is hard wired to the relay to provide status information and control capabilities, and can be integrated with the circuit breakers supplying the feeder. A Siemens 7SJ64 controller may be used in place of the 7SJ80 to provide added HMI and control capability (Fig. 4).

Versatile communications The Siemens Distribution Feeder Automation System employs the IEC 61850 communication standard for all operational and non-operational data exchange among devices (Fig. 5). Through high speed, peer-to-peer Ethernet communications, the system is capable of providing extensive decentralized automation. Ethernet backbones can be established over a variety of media including direct fiber, or Ethernet over fiber, copper, and WiMAX.

The PLC and an IEC 61850 communication port in each relay provide the logic required to meet most operational requirements. The communication port can be connected to an Ethernet-to-fiber switch or wireless subscriber unit. In fiber systems, all Ethernet switches form a private Ethernet network. In wireless systems, the wireless subscribers connect to controllers that communicate with a wireless base station to create a private Ethernet network.

This configuration creates an independent FLISR automation system that can be linked to a distribution control network through a simple wire connection between the controller and a substation RTU. A DNP3 data link can be provided through a standard protocol converter to interface with the IEC 61850 system.

An entire distribution network can be configured using multiple FLISR setups to create a system of independent, intelligent cells. These cells contain most of the intelligence required to simplify the operation of large distributed automation networks.

For distribution control network applications, systems can be configured with an optional substation PC to provide a SCADA gateway with IEC 61850 protocol translation and a powerful control HMI using Siemens SICAM PAS and PAS CC software. User-friendly programming The Siemens Distribution Feeder Automation System functionality is programmed into the controllers using the easy-to-use DIGSI software tool. This single software package provides the complete means to program individual controllers, including IEC 61850 peer-to-peer GOOSE messaging for the dissemination of fault, status, and mode information among all devices.

Each relay can be programmed to operate in different modes to satisfy system and environmental require- ments as directed by a remote control point or SCADA system. Operating modes include auto (FLISR), remote, manual, restoration, load control, load balancing, storm, and more.

DIGSIConfiguration

Software

7SJ80Relay

SICAM PASHMI

VectorSwitch

SCADA

7SR22Relay

SDRRecloser

7SJ64Relay/HMI

SDV7Circuit

Breaker

SiemensProvides

SDFAComponents

Fig. 3. Siemens SDFA components

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Subject to change without prior notice Order No.: E50001-E720-A156-X-4AUSPrinted in USA © 2012 Siemens Energy, Inc.

Siemens Energy, Inc.7000 Siemens RoadWendell, North Carolina 27591 USA

+1 (877) 217-4943

The information provided in this flyer contains merely general descriptions or characteristics of performance which in case of actual use do not always apply as described or which may change as a result of further development of the products. An obligation to provide the respective characteristics shall only exist if expressly agreed in the terms of contract.

All product designations may be trademarks or product names of Siemens AG or supplier companies whose use by third parties for their own purposes could violate the rights of the owners.

Real-life simulation The Siemens Distribution Feeder Automation System includes a realistic simulation mode that models the operation of switch devices by effectively disconnecting the protective relays from the system. Operator HMIs receive simulated system status information as if the system were actually online and operating. Simulated faults can be applied to line sections to test operational sequences without changing the physical status of any primary switch device. The performance and functionality of an entire FLISR system, including the related communication network, can be tested and evaluated. Scalable turnkey implementation Siemens Distribution Feeder Automation Systems are supplied with all required hardware and software for immediate

implementation. However, systems can be custom-engineered to integrate with existing equipment or to satisfy special requirements, depending on product availability, requested functionality, and the condition of installed equipment.

All systems are designed and built using a scalable, building block approach that enables utilities to invest only in systems that best fit their cost and performance requirements. For example, with a relatively small initial investment in a handful of relays and switches, a utility can realize substantial operating economies when automating feeders supplying critical loads, such as hospitals and emergency facilities. Any resultant savings could then be reinvested by automating additional feeders, or by adding performance-enhancing features such as remote monitoring and control. In this way, a utility can maximize the cost effectiveness of its feeder automation improvements.

To help ensure a successful deployment, all turnkey systems are completely configured and tested in the Siemens Smart Grid Laboratory in Wendell, N.C. Testing includes analysis of the communi- cation network deployed as part of the system. Furthermore, Siemens offers a full range of system support products and services including on-site and factory support, product documentation, accessories, and training programs for all equipment used in the installation. Find out more today To discover how the Siemens Distribution Feeder Automation System can help maximize your distribution feeder availability, please contact your nearest Siemens representative. We’ll be pleased to discuss your specific needs and offer a solution that maximizes customer satisfaction while reducing service expenses.

Control Center

HMI

Breaker 21 Ckt 2201

4.54 Mi. 5.14 Mi. 9.95 Mi.

0.53 Mi.

1.26

Mi.

3.34

Mi.

3.83

Mi.

8.95

Mi.

Network Data Bus 7SR22 Recloser

Controller

7SR22 Recloser

Controller 7SR22 Recloser

Controller

7SJ80 Automation Controller

7SJ80 Automation Controller 7SJ80

Automation Controller

7SJ64 Automation

Controller/HMI

7SJ64 Automation Controller/

HMI

P1 Subscriber Unit (SS1)

WiN5237-5

Rogers Dr. Recloser 39141/60791P2 Subscriber Unit (SS2) WiN5237-5

WiN7237-5 Base Station

(BS3) with one MT-404067/ND

Antenna

Critical Load Hospital

WiN7237-5 Base Stations (BS1, BS2) with one each MT-404067/ND Antenna

P3 Subscriber Unit (SS3) WiN5237-5

Franktown Rd. Recloser 39052/60647

Machipongo Recloser

37803/58190

P4 Subscriber Unit (SS4) WiN5237-5

P4 Subscriber Unit (SS5) WiN5237-5

Breaker 2240-30 Ckt 2240

Manual Sect. Switch

Bayview Substation/

Base Station

Exmore Office/

Base Station

Kellam Substation

P1 P5N.C.P4P3P2

Tasley Control Center

RS910-HI Switch

Existing Switch

PoE

Existing Switch

RS900G-48 Switch

PoE PoE

RS900G-HI Switch

PoE

RS910-48 Switch

PoE

RS910-48 Switch

PoE PoE

RS910-48 Switch

RMC40-48 Switch

PoE

9.73

Mi.

BroadbandMetallic Ethernet Wireless Ethernet

Serial DNP3Distribution Feeder

Fig. 5. System interconnections