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Answers for energy.

Type SDFA Siemens distribution feeder-automation system

Type SDFA distributionfeeder-automation system

System description

The Siemens type SDFA feeder auto-mation system acts as an extension to

your substation. The system performs the

functions of fault detection, isolation and

restoration (FDIR).

The type SDFA-DC system uses an open

standard for communications among all

the intelligent devices within the loop.

Through high-speed, peer-to-peer

communications over Ethernet, the

system is capable of providing extensive

decentralized automation.

The Siemens Smart Grid intelligentdevices provide fault detection, isolation

and restoration logic in a group of

reclosers, switches, or a combination of

both, within a loop. The protective relay

has a powerful programmable logic

controller (PLC) and an IEC 61850

communication processor providing the

required logic and flexibility for the

specific application. The Ethernet

backbone can be linked over a twisted

pair, fiber or an Internet protocol (IP)-

based radio system, broadband over

powerline (BPL) or digital subscriber line

(DSL).

Structure

Each loop can be constructed usingSiemens type SDR reclosers, Bridges

Electric typeVector switches or a

combination of both. The Siemens type

SDR recloser or Bridges Electric type

Vector switch is equipped with a Siemens

protective relay that contains the

necessary logic to interface with the grid

and establish proper control. The

intelligent device is wired to the current

and voltage sensors, or voltage

transformers (VTs) and current

transformers (CTs), to monitor the flow of

power.An entire distribution system can be

configured using this system. The self-

healing logic resides in the individual

intelligent electric device (IED) groups

located in the feeder loops. Detailed

operational data is then conveyed back to

a SCADA or substation that allows the

control of circuit ties to further heal the

distribution grid.

Type SDR recloser

Type Vector switch

Type 7SJ80

protective relay

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Effective automation requires that control

reside as deep inside the grid as possible.

There must also be oversight that will

allow higher level control of the grid. The

individual self-healing loop breaks the

grid into manageable segments and

allows the utility to further define the

healing process logic for its distribution

system.Each loop can be set to operate in a

completely automated state, in a remote

manual mode via SCADA or Siemens type

SICAM PAS, or in manual mode for users

in the field (via password protected user

override). Remote mode is an override

that allows the operation center to

perform closing and opening operations

to reconfigure the grid. The loop can

contain at least 20 switching devices

within one group of devices or loop.

There is no need for a master-slavearrangement since IEC 61850 uses peer-

to-peer communications. This means

real-time control, a fast-healing grid,

fault location information processed in

seconds and new patented differential

equations using peer-to-peer

communications between switching

points. Since the devices all communicate

in a peer-to-peer manner, Siemens has

been able to eliminate some of the

necessary input devices that would

normally be required in a loop-

automation system.

System design

The system is designed to work using

independent automated device groups.

The IEDs located at each device are

associated with a Bridges Electric type

Vector switch or Siemens type SDR

recloser and include current and voltage

sensors to provide the necessary input of

data used to determine logic sequences.

This information is then made available

to each of the other intelligent devices,

over the communications channel located

within that particular loop, and therefore,

back to the substation(s) and up to

SCADA.

www.usa.siemens.com/energy

For more information, please contact

your local Siemens representative.

ublished by and copyright 2010:

iemens AG

nergy Sector

reyeslebenstrasse 1

1058 Erlangen, Germany

iemens Energy, Inc.

000 Siemens Road

Wendell, North Carolina 27591 USA

For more information, contact

+1 (800) 347-6659

www.usa.siemens.com/energy

Siemens Energy, Inc.

Order No. E50001-F710-A246-X-4A00

Printed in USA

TD 1350D IN 0410.5

All rights reserved.

Trademarks mentioned in this document are

the property of Siemens AG, its aff iliates or

their respective owners.

Subject to change without prior notice.

The information in this document contains

general descriptions of the technical options

available, which may not apply in all cases.

The required technical options should therefore

be specified in the contract.

Peer-to-peer functionality via IEC 61850

generic-object-oriented substation event

(GOOSE) messages provides not only

binary data, but analog values as well.

Each device contains extensive PLC logic

programmed to handle the automation.

The user simply inputs standard

information such as voltage, current,

time-current characteristic curves (TCCs)and load. The IEDs will then handle the

self-healing functionality and attempt to

clear faults, isolate and then, after the

fault is removed, initiate the restoration

logic.

Features:

Intelligent-loop topology

Ethernet backbone with peer-to-peer

communications over a variety of

platforms (fiber, IP-based radio, etc.)

Open standard and not a proprietarysystem (IEC 61850)

Automatic fault detection, isolation

and restoration to normal (FDIR)

Multiple management locations

Real-time SCADA information

Graphical display via human-machine

interface (HMI)

Programmable restoration logic

Intelligent high-speed fault detection

Auto-feeder return to normalrestoration

Remote setting changes to allow grid

flexibility

Complete loop fault recording for

class A violations

Monitor ANSI class A violations

Load data trending reports available

Integration into RTU and substation

automation (SSA) systems

Flexible system allows for expansionvia cut and paste system

Faster fault detection, clearing and

isolation

Immediate automatic restoration

Single communication standard for

operational and non-operational data

transfer

Easily integrated into SCADA systems

Advanced monitoring features

Secure failsafe functionality.

Delivery

The system is available in standard

feeder-automation formats. Each feeder

is configured and bench tested in the

Siemens Smart Grid Lab located in

Wendell, North Carolina. The testing

includes the linking of communication

devices specified by the utility. Custom

systems can be engineered to meet the

requirements not offered in our standardtransfer schemes.