Draft Technical Report – AHWG07 - Harmonization Issues
Use Case 1: Network Extension
1. Summary:
Add a new line and transformer and replace the old control and protection system with a new
automated system based on 61850 standards. Consider then:

how to reuse the data from the old system, e.g. tag-names, parameters, connectivity.

the addition of new measurements, control functions, protection etc.

implications of emergency replacement
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2. Actor(s):
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Name
Role description
Network Planner, company 1
(builds a new substation)
Make studies of the line parameters to properly
design the line. Works within the planning department
at the ISC (ISO).
Network Planner, company 2
(builds a new bay)
Make studies of the line parameters to properly
design the line. Works within the planning department
at the ISC (ISO).
Line Engineer company 1
Engineer the line on company 1 territory. System
operator engineering department.
Line Engineer company 2
Engineer the line on company 2 territory. System
operator engineering department.
Substation Engineer company 1
Engineer the new substation primary and secondary
equipment. System operator engineering department.
This includes substation layout, protection, control,
and metering.
Substation Engineer company 2
Engineer the new bay primary and secondary
equipment. System operator engineering department.
This includes bay layout, protection, control, and
metering. A large number of people from various
departments are cooperating in this.
Communication Network
Engineer company 1
Engineer the Communication Network in company 1
territory. System operator engineering,
communications, or IT department.
Communication Network
Engineer company 2
Engineer the Communication Network in company 2
territory. System operator engineering,
communications, or IT department.
Vendors
Build and/or install equipment.
System Operator company 1
Upgrades the Control Center (CC) with new data
reflecting the new line and data exchange. Prepares
the data exchange with other Control Centers.
Company specific rules are used to decide what data
is exchanged and how (ICCP, 101/104 etc.)
System Operator company 2
Upgrades the Control Center (CC) with new data
reflecting the new line and data exchange. Prepares
the data exchange with other Control Centers.
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3. Probable Participating Systems:
System
Services or information provided
Power System Network
planning tool
Calculate network parameters based on Load Flow
and/or dynamic stability programs.
Communication Network
planning
Determine communication technology and connectivity
that will be required to exchange information to/from and
within the substation.
Line engineering tool
Used to design the transmission line
Substation engineering tool
Used to design substation lay out (CAD-tool)
Protection design tool
Used to calculate protection schemes
Substation automation
configuration tool (System
configurator in 61850-6)
Used to design the substation protection, control and
metering. Overall design independent of vendor.
IED configuration tool (IED
configurator in 61850-6)
Vendor and product specific configuration and
implementation of substation automation configuration.
Substation control system
(IED hardware)
The actual substation control system running the IED
instances.
Communication NetworkData
communication concentrator
configuration/configurator
Used to describe the data exchange between systems.
Metering system Function
Data Engineering
Collect energy metering and performs billing. Includes
configuration of metering subsystem.
Control Center Data
Engineering
Used to configure and load the Control Center database.
Note: This is Power System and Communication
Network configuration
Control Center
The actual CC performing supervision, control, (SCADA)
on-line network calculations, Load frequency control, ...
4. Pre-conditions:
Existing system without substation automation.
5. Assumptions / Design Considerations:

New IEC 61850 devices are being added to an existing substation. Assume no substation
automation in existing system, so that part of this use case is replace existing protection and
control equipment with new substation automation based on 61850.
Variations on this use case for future consideration:
1. Existing substation is already 61850 automated, so this is just an addition of a new line and transformer
with extension of existing substation automation equipment.
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6. Normal Sequence:
Step
Description of actor
activity
Input to this step
Processing
Output from this step
1
Network planner plans
transmission line.
Order from manager at
the company.
Requested line capacity.
High level planning for
new line and transformer
Planned line parameters
(in the CIM model), e.g.
tentative impedance
values, approx length,
substations at
endpoints.
Network planning tool
Format: Plan as
Incremental CIM/XML
model export or less
formally.
Action – define line
parameters involved
2
Line engineer designs the
line.
Planned line parameters
from step 1.
Line engineering tool
Select towers, patterns
of lines, catalog lookup,
calculate exact line
length, - , tower
placement, mutual
coupling,
Actual line parameters
updated (in the CIM
model), e.g. impedance
values, length, cable
characteristics,
geometries, line right of
way, geometry,
Format: CIM/XML
Additional data not in
CIM for planning
3
Design the substation
layout and specify primary
equipment (includes both
planning and design).
Actual line parameters
from step 2.
Availability and capacity
requirements.
Substation engineering
tool
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Add breakers, switches,
bus extension, to
existing CIM model.
Name all new equipment
(line, transformer, other)
Primary equipment
specifications, names
(on drawings) and
Power System
connectivity (topology).
Produce partial SSD file
(topology)
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Described in SCL and/or
CIM model.
4
Plan protection.
Protection design tool
5
Plan metering.
Metering design tool
6
Design substation
functions.
Substation automation
configuration tool
Substation diagrams
and primary equipment
specifications from step
3.
Allocate functions
(includes protection and
metering) to IEDs.
Metering functions and
parameters. Described
in SCL. May be passed
to CIM.
Protection and metering
functions and
parameters from steps 4
and 5.
Control functions
(including also load shed
etc.), protection, and
metering. Described in
SCL. May be passed to
CIM.
Control, protection, and
metering functions from
step 6.
Defined IEDs including
the configuration of
parameters and signal
points.
Defined IEDs from step
7
Complete configured
IED deployed to
hardware
Complete configured
IED configurations from
steps 3 thru 8.
Communication
parameters associated
with ISO/OSI reference
model layers 1 thru 6
including security
parameters.
IED configuration tool.
8
Deploy functions to IEDs.
IED configuration tool.
9
Design Communication
Network topology.
Protection functions and
parameters. Described
in SCL. May be passed
to CIM.
Substation diagrams
and primary equipment
specifications from step
3.
Substation diagrams
and primary equipment
specifications from step
3.
7
Provide all new SS
protection equipment,
IEDs, etc. to bring in
61850 automation.
This step also includes
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the configuration of a
substation information
concentrator if used
(e.g. a sub-SCADA
master or RTU or
IED/distributed IEDs).
In CIM and SCL.
10
Configure Substation
Communication
Information Exchange
Model (communication
front end).
Complete configured
IED deployed to
hardware from step 8.
Old point definitions, any
new points available.
Functional Model (in
SCL – or through the
browsing of active
devices): names,
reporting groups,
periodicity, etc. Pass to
CIM.
Substation diagrams
and topology from step
3.
Operational CC
Data communication
concentrator or
configurator.
11
Configure control center
including Power System
model and SCADA data
points (measurements)
Control Center Data
Engineering
12
Configure metering
system function.
Metering system Data
Engineering
13
Take data into operation
Control Center and/or
metering system
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Communication Network
topology and Functional
Model from steps 9 and
10.
Communication Network
topology and Functional
Model from steps 9 and
10.
Operational metering
system
Operational systems
from steps 10, 11, and
12.
Test protocols
documenting verified
data points.
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7. Exceptions / Alternate Sequences:
Since updates are supplied in advance of commissioning, several may be outstanding at
one time. Furthermore, updates could be issued in one order and notified in another,
i.e., for two updates X and Y, the steps could be: issue X; issue Y; notify Y in service;
notify X in service.
8. Post-conditions:
Complete and error-free transfer. A model merge is required before model should be
used. Any unnecessary (e.g., duplicate data or data outside scope of merged model)
model data received will be discarded.
9. Integration Scenario
No diagram available.
10. References:
Use Cases referenced by this use case, or other documentation that clarifies the
requirements or activities described.

Incremental Model Update Use Case

Network Snapshot Use Case
11. Issues:
ID
Description
Status
1.
12. Revision History:
No
Date
Author
Description
0.
3/31/2003
LOO et al
Initial version
1.
8/4/2003
Herb Falk
Terminology update
2.
8/5/2003
AHWG07
Reviewed in meeting
3.
7/12/2006
T. Saxton
Expanded to discover data required at each step
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13. Use Case Diagram:
System
Planner
Step 1
System Design
(Steps 1, 2, 3)
CC
Model
As Built
(SCL or 61850
browse)
Step 9
Substation
Step 9
Substation
Engineer
Steps 4, 5, 6, 7
As Designed (SCL)
Step 2
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