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Uca/mms Overview; Mms; C.1.1 Uca - GE UR Series Instruction Manual

Line differential relay.
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APPENDIX C
APPENDIX C UCA/MMSC.1 UCA/MMS OVERVIEW
The Utility Communications Architecture (UCA) version 2 represents an attempt by utilities and vendors of electronic
equipment to produce standardized communications systems. There is a set of reference documents available from the
Electric Power Research Institute (EPRI) and vendors of UCA/MMS software libraries that describe the complete capabili-
ties of the UCA. Following, is a description of the subset of UCA/MMS features that are supported by the UR relay. The ref-
erence document set includes:
Introduction to UCA version 2
Generic Object Models for Substation & Feeder Equipment (GOMSFE)
Common Application Service Models (CASM) and Mapping to MMS
UCA Version 2 Profiles
These documents can be obtained from ftp://www.sisconet.com/epri/subdemo/uca2.0. It is strongly recommended that all
those involved with any UCA implementation obtain this document set.
COMMUNICATION PROFILES:
The UCA specifies a number of possibilities for communicating with electronic devices based on the OSI Reference Model.
The UR relay uses the seven layer OSI stack (TP4/CLNP and TCP/IP profiles). Refer to the "UCA Version 2 Profiles" refer-
ence document for details.
The TP4/CLNP profile requires the UR relay to have a network address or Network Service Access Point (NSAP) in order
to establish a communication link. The TCP/IP profile requires the UR relay to have an IP address in order to establish a
communication link. These addresses are set in the
menu. Note that the UR relay supports UCA operation over the TP4/CLNP or the TCP/IP stacks and also supports opera-
tion over both stacks simultaneously. It is possible to have up to two simultaneous connections. This is in addition to DNP
and Modbus/TCP (non-UCA) connections.
The UCA specifies the use of the Manufacturing Message Specification (MMS) at the upper (Application) layer for trans-
fer of real-time data. This protocol has been in existence for a number of years and provides a set of services suitable for
the transfer of data within a substation LAN environment. Data can be grouped to form objects and be mapped to MMS ser-
vices. Refer to the "GOMSFE" and "CASM" reference documents for details.
SUPPORTED OBJECTS:
The "GOMSFE" document describes a number of communication objects. Within these objects are items, some of which
are mandatory and some of which are optional, depending on the implementation. The UR relay supports the following
GOMSFE objects:
DI (device identity)
GCTL (generic control)
GIND (generic indicator)
GLOBE (global data)
MMXU (polyphase measurement unit)
PBRL (phase balance current relay)
PBRO (basic relay object)
PDIF (differential relay)
PDIS (distance)
PDOC (directional overcurrent)
PFRQ (frequency relay)
UCA data can be accessed through the "UCADevice" MMS domain.
GE Power Management
Ö
SETTINGS
PRODUCT SETUP
PHIZ (high impedance ground detector)
PIOC (instantaneous overcurrent relay)
POVR (overvoltage relay)
PTOC (time overcurrent relay)
PUVR (under voltage relay)
PVPH (volts per hertz relay)
ctRATO (CT ratio information)
vtRATO (VT ratio information)
RREC (reclosing relay)
RSYN (synchronizing or synchronism-check relay)
XCBR (circuit breaker)
L90 Line Differential Relay
C.1 UCA/MMS OVERVIEW

C.1.1 UCA

ÖØ
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COMMUNICATIONS
NETWORK
C.1.2 MMS
C
C-1

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