IEC61850 Primer - Communication Networks and Systems In Substations

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IEC 61850 Primer -
Communication Networks
and Systems In Substations
February 16, 2005

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February 16, 2005
61850 Scope

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February 16, 2005
Abstract Communications Service
Interface ACSI
•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

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February 16, 2005
Anatomy of an IEC61850 Object
Name
Physical Device
(network address)
Logical Device
(e.g. Relay1)
MMXU1 MMXU2
MXMX
AV
Logical Nodes
Functional Constraint
“MMXU2$MX$A” =
Feeder #2 Current Measurements

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February 16, 2005
Logical node groups
L System LN (2)
PProtection (28)
RProtection related (10)
C Control (5)
G Generic (3)
I Interfacing and archiving (4)
A Automatic control (4)
MMetering and measurement (8)
S Sensor and monitoring (4)
XSwitchgear (2)
T Instrument transformers (2)
Y Power transformers (4)
Z Further power system
equipment (15)
Exam ple s:
PDIF: Diffe re ntialpro te ctio n
RBRF: Bre ake r failure
XCBR: Circuit bre ake r
CSWI: Switch co ntro lle r
MMXU: Me asure m e nt unit
YPTR: Po we r transfo rm e r

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February 16, 2005
Services Examples
• GetData – Read
• SetDataValues – Write
• GetDataDirectory – Read list of object names

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February 16, 2005
ACSI Services
Enable
Self
Describing
Devices

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February 16, 2005
IEC61850 Profiles

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February 16, 2005
IEC61850 Documents
Basic principles Part 1
Glossary Part 2
General Requirements Part 3
System and project management Part 4
Communication requirements Part 5
Substation Automation System Configuration Part 6
Basic Communication Structure Part 7
Part 9
Sampled Measured Values
Part 8
Conformance testing Part 10
Mapping to Ethernet
Mapping to
MMS and
Ethernet

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February 16, 2005
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

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February 16, 2005
IEC61850 Substation
Architecture
MU = Merging Unit
MU
PT1 Optical
CT
MU
PT2 CT2
MU
Optical
PT
Optical
CT
Relay Relay Relay
MU Publishes
V/I/Status
Datasets
Relay(s)
Subscribe to
Datasets
I/O I/O I/O
Station Bus- 10/100/1000 MB Ethernet
Process Bus
.1/1/10GB
Ethernet
Clk1 Clk2
Remote
Access
Network
MU = Merging Unit
MU
PT1 Optical
CT
MU
PT2 CT2
MU
Optical
PT
Optical
CT
IED IED IED
MU Publishes
V/I/Status
Datasets
Relay(s)
Subscribe to
Datasets
I/O I/O I/O
- 10/100/1000 MB Ethernet
.1/1/10GB
Ethernet
Clk1 Clk2
Remote
Access
Network

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February 16, 2005
Sampled Measured Values

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February 16, 2005
. . .
Peerto PeerCommunications
Functional Requirements
Bkr 1
Relay
Trip
Bkr 2
Relay
Bkr N
Relay
Bkr 3
Relay
BFI
• Message delivery to multiple devices
simultaneously
• Fast Delivery (< 4ms)

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February 16, 2005
IEC61850 Generic Object Oriented
Substation Event - GOOSE
• Device to multi-device
communication – Local or
Wide Area
•Bridgeable but Non-routable
•User-defined Dataset sent in
an Ethernet Multicast
message
•Message sent on change of
state as well periodically to
enable detection of device
failure
• Reliability effected through
message repeat
GOOSE Header:
• Multicast Address
•Name
•Time Until Next GOOSE
•Etc.
User-Defined Dataset
• Status Information
•Analog Values
•Data Quality
•Time

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February 16, 2005
SCL – Substation Configuration
Language
• 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

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February 16, 2005
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.

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February 16, 2005
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 $$$$ in config., setup,
and maint.
• Standardized configuration file formats enables
exchange of device configuration saving $$$$
in design, specification, config., setup, and
maint.

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February 16, 2005
Benefits of IEC61850 - 2
• 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 wiring and connection
costs

IEC61850 Primer - Communication Networks and Systems In Substations

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