IEC 61850 Communication Networks and Systems In Substations: An Overview for Users

1
IEC 61850 Communication Networks and Systems In
Substations An Overview for Users

• SIPSEP 2004
• Monterrey, Nuevo León, México
• Miércoles 10 de Noviembre, 2004

2
IEC61850 and UCA2
IEC 61850
3
IEC61850 Substation Architecture
4
IEC61850 Standard
Part 1
Basic principles
Part 2
Glossary
Part 3
General Requirements
Part 4
System and project management
Part 5
Communication requirements
Part 6
Substation Automation System Configuration
Part 7
Basic Communication Structure
Mapping to MMS and Ethernet
Sampled Measured Values
Part 8
Part 9
Mapping to Ethernet
Part 10
Conformance testing
5
IEC61850 Primary Parts

• Part 6-1 Substation Configuration Language (SCL)
• Part 7-2 Abstract Communications Service
  Interface (ACSI) and base types
• Part 7-3 Common Data Classes (CDC)
• Part 7-4 Logical Nodes
• Part 8-1 Specific Communications Service
  Mappings (SCSM) - MMS Ethernet
• Part 9-2 SCSM - Sampled Values over Ethernet
• Part 10-1 Conformance Testing

6
IEC61850 Class Model
Physical Device access by network address
SERVER
Enables data from multiple devices to be
aggregated into a single physical device (data
concentrator)
LOGICAL-DEVICE
LOGICAL-NODE
DATA
DataAttribute
7
Logical Nodes

• A named grouping of data and associated services
  that is logically related to some power system
  function.

dddXCBR1
Logical Node Instance
Logical Node Name per IEC 61850-7-4 (breaker)
Optional Application Specific Prefix
8
IEC61850-7-4 Logical Nodes
9
Logical Node Description - XCBR
SPS
Mandatory/Optional
Common Data Class
Description
Data Name
10
Single Point Status (SPS) CDC(e.g. loc)
stVal
Attribute Name
Mandatory/ Optional
Type
Range of Values
Functional Constraint
11
Object Name Structure
12
ACSIAbstract Communications Service Interface

• Defines a set of Objects
• Defines a set of Services to manipulate and
  access those objects
• Defines a base set of data types for describing
  objects

13
ACSI Objects
14
ACSI Services
Enable Self Describing Devices
15
Reporting Features

• Unbuffered Reporting is equivalent to UCA2
  reports
• Buffered reporting enables the server to retain
  data if associations are lost enabling the client
  to retrieve ALL data.

16
Relay-Relay Messaging
GSSE Generic Substatation Status Event
GOOSE Generic Object Oriented Substation Event
128 status bit pairs
InformationReport
Data set containing named values and status
OSI Connectionless Non-Routable Profile
Ethernet Multicast Address
Ethernet Multicast Address
Published to all devices subscribed to data on
multi-cast address
Published to all devices subscribed to data on
multi-cast address
(UCA GOOSE)
17
GOOSE/GSSE is Reliable Multicast
NON-EXISTENT
New State 1.Sequence Number 0 2.State
Number 3. Reset HoldTimer
RETRANSMIT- PENDING
1. Hold Time Preset 2. Start Hold Timer 3.
Sequence Number
HoldTime expired
SEND Message
18
SCL Substation Configuration LanguageIEC61850-6
-1

• Description language for communication in
  electrical substations related to the IEDs
• XML based language that allows a formal
  description of
• Substation automation system and the switchyard
  and the relation between them
• IED configuration

19
SCL File Types

• SSD System Specification Description. XML
  description of the entire system.
• SCD Substation Configuration Description. XML
  description of a single substation.
• ICD IED Capability Description. XML
  description of items supported by an IED.
• CID Configured IED Description. XML
  configuration for a specific IED.

20
Sampled Measured Values

• A method for transmitting sampled measurements
  from transducers such as CTs, VTs, and digital
  I/O.
• Enables sharing of I/O signals among IEDs
• Supports 2 transmission methods
• Multicast service (MSVC) over Ethernet
• Unicast (point-to-point) service (USVC) over
  serial links.

21
SMV Application
22
IEC61850 Controls

• 4 Control Models
• Direct Control with normal security
• SBO Control with normal security
• Direct Control with enhanced security
• SBO Control with enhanced security
• Enhanced Security provides validation and
  supervision of the control action and reporting
  of status.

23
IEC61850 Profiles
24
Relationship to UCA2
CASM
IEC 61850-7-2(Services and basedata types)
IEC 61850-8-1(Mapping to MMS)
IEC 61850-7-3(Common Data Classes)
GOMSFE
Bricks
IEC 61850-7-4(Logical Nodes)
25
Terminology

• IEC61850
• CDC
• ACSI
• Logical Node
• Generic Substation Status Event (GSSE)

• UCA2.0
• GOMSFE
• CASM
• Brick
• GOOSE

26
UCA2 vs. 61850 Object Models

• Data Object Model
• Data Set Model
• Association Model
• Server Model
• Unbuffered Reporting Model
• Security Model
• Time Model
• Direct and SBO Control
• GSSE (called GOOSE in UCA2)

• Data Object Model
• Data Set Model
• Association
• Server
• Unbuffered and Buffered Reporting
• No explicit Security
• Time
• Direct, SBO, enhanced Control
• GOOSE, GSSE, and GSE Management

27
UCA2 ? IEC61850 Migration

• UCA2.0 is mostly a subset of IEC61850.
• Some additional services and objects.
• Some object changes.
• IEC61850 uses SNTP for networked time synch.
• An IEC61850 client can be compatible with both
  UCA2 and IEC61850.

28
Benefits of IEC61850

• SIPSEP 2004 Communications Panel Session
• Ralph Mackiewicz
• SISCO, Inc.
• ralph_at_sisconet.com

29
Keys to Obtaining Benefits

• Requires a view of cost beyond just the purchase
  price.
• The benefit of an IEC61850 device is not in the
  price of the device Benefit is in lower cost to
  use the device.
• The benefit of an IEC61850 system is not in
  buying the system Benefit is in lower costs to
  start and use the system.

30
IEC61850 is Unique

• Not a recast serial RTU protocol
• Designed specifically for LANs to lower life
  cycle cost to use a device
• Cost to install, configure, and maintain
• Real object-oriented approach for SA
• Supports standardized device models using names
  instead of object/register numbers and indexes.
• Standardized configuration language (SCL).
• Feature rich with support for functions difficult
  to implement otherwise.

31
IEC61850 Network Architecture

• Data from IEDs available to all applications via
  network.
• Communications unaffected when adding devices or
  applications.
• Standard net. gear provides high perf.
  flexibility with environmental protection.
• Applications and IEDs share common
• Protocols
• Data Format and Context
• Data Addressing/naming Conventions
• Configuration Language

32
IEC61850 View of Devices

• Only network addressing requires configuration in
  the remote client.
• Point names portray the meaning and hierarchy of
  the data.
• Point names can be retrieved from the device
  automatically without manual intervention.
• All devices share a common naming convention.
• Device configurations can be exchanged using
  IEC61850-6-1 (SCL) files

33
Benefits of IEC61850

• High-level services enable self-describing
  devices automatic object discovery saving
  in configuration, setup and maintenance.
• Standardized naming conventions with power system
  context eliminates device dependencies and tag
  mapping saving in config., setup, and
  maintenance.
• Standardized configuration file formats enables
  exchange of device configuration saving in
  design, specification, config., setup, and maint.

34
Benefits of IEC61850

• Higher performance multi-cast messaging for
  inter-relay communications enables functions not
  possible with hard wires and save in wiring
  and maintenance.
• Multi-cast messaging enables sharing of
  transducer (CT/PT) signals saving by
  reducing transducers and calibration costs.

35
Justification
36
Thank You
Ralph Mackiewicz SISCO, Inc. 6605 19½ Mile
Road Sterling Heights, MI 48314-1408 USA Tel
586-254-0020 x103 Fax [phone] E-Mail
ralph_at_sisconet.com
Complete presentations and papers will be posted
at http//www.sisconet.com/techinfo.htm