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IEC 61850-90-5

The New GOOSE,Synchrophasors, and SampledValues

Rich HuntGE Digital Energy


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2 /UTC: 90-5 and Synchrophasors9/12/2012

Synchrophasors

Defined in C37.118.1 - 2011


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North American SynchroPhasor Initiative

Network -NASPInet Vision


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Synchrophasor transmission

C37.118.2 2011 defines synchrophasor

transmission requirements Data message formats

UDP / IP based (unicast)


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Gaps in C37.118

No defined security

o Requires an external solution

o Multicast security not defined

Dataset Configuration tools are vendor

specific No standard data names

Limitations on dataset name length

Lack of Negative response from the server

o Some consider this a feature


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IEC 61850

Self-description of data

Peer-to-peer messaging

GOOSE event data

Sampled Values (SV) analog samples

Multicast actually

broadcast


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Mapping Synchrophasors intoGOOSE

Router

w/ UDP/IP

GOOSE

message

Routed

GOOSE

GOOSE

No IP Address No Transport

o UDP

o TCP

Bit

BucketGOOSE after router

RequiresRouterconfiguration


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Committee Approved TechnicalReport:

IEC 61850:

COMMUNICATION NETWORKS AND

SYSTEMS FOR

POWER UTILITY AUTOMATION

Part 90-5: Use of IEC 61850 to transmit

synchrophasor

information according to IEEE C37.118


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TR 90-5 defines

R-GOOSE (for Routed GOOSE) For routing of Event Data

And

R-SV (for Routed Sample Values) For routing periodic data


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11 /UTC: 90-5 and Synchrophasors

9/12/2012

IEC 61850 90-5 NetworkedGOOSE/SV

Potential Solution for NASPINet


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9/12/2012

Payload

Consists of Multiple 9-2 Protocol Data Units(PDUs)

PDU consists of: Header

Dataset

An Implementation Agreement isproposed to agree to the items in the

Header and Dataset


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9/12/2012

Reliable Transport through Repeat

ASDU1 Oldest data

ASDUn Newest datan is a user-settable parameter


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9/12/2012

Internet Protocol Priority via

Differentiated Services byte

0

1

1

0

2

1

3

1

4

1

5

0

6

0

7

0

DSCP ECN

DSCP - Differentiated Service Code Point set for Expedited Forwarding (0x2E)

ECN Explicit Congestion Notification Set by the routers if enabled Overall byte value: 0xB8

Bit #:

Value:


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9/12/2012

Definition of Terms: Multicast

Message Only Sent to Intended Recipients


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9/12/2012

Unicast vs. Multicast

Requires 3x Bandwidth in this example 3X Infrastructure $$$

Point-to-Point

Multiple Streams

Multicast

One Output Stream


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9/12/2012

Multicast Path Establishment viaInternet Gateway Management Protocol IGMP


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Security Definition in 90-5

Defines a Secure Hash Algorithm - SHA2Hash code for message authentication /

integrityDefines AES as the encryption algorithm

Identifies / Extends a Key managementsystem

RFC 3547 The Group Domain of

InterpretationThe publisher manages the keys to all

subscribers

Same key for Hash and Encryption


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UTC: 90-5 and Synchrophasors9/12/2012

Group Domain of Interpretation - GDOI

Publishers act as Controllers Receiving Group Members Pull new keys

Centralized Authorization Management


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Publisher-based Key Management

KeyManager

KeyReceiver

KeyReceivers

Keys are dynamically managedChanged when a Subscriber is removed


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Summary

TR 90-5

will eventually replace C37.118 forsynchrophasor transmission

Uses 61850 data modeling, configuration

describes R-GOOSE and R-SV Multicast

Supports re-transmission of data Defines explicit security for synchrophasor

data


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