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APPENDIX E
E.3 IEC 60870-5-103
E.3 IEC 60870-5-103
IEC 60870-5-103 applies to protection equipment with coded bit serial data transmission for exchanging information with
control system. It defines a companion standard that enables interoperability between protection equipment and devices
of a control system in a substation.
IEC 60870-5-103 presents specifications for the informative interface of protection equipment.
IEC 60870-5-103 presents two methods of information exchange: the first is based on explicitly specified APPLICATION
SERVICE DATA UNITS (ASDUs) and application procedures for transmission of "standardized" messages and the
second uses generic services for transmission of nearly all possible information. The "standardized" messages do not
cover all possible protection functions, and furthermore a protection device may support only a subset of the messages
specified in this standard
The IEC 60870-5 protocol is based on the three layer reference model "Enhanced Performance Architecture" (EPA).
This physical layer uses a fibre optic or a copper-wire based system that provides binary symmetric and memory less
transmission.
The link layer consists of a number of link transmission procedures, using explicit LINK PROTOCOL CONTROL
INFORMATION (LPCI), that are capable of carrying APPLICATION SERVICE DATA UNITS (ASDUs) as link user data.
The link layer uses a selection of frame formats to provide the required integrity, efficiency, and convenience of
transmission.
The application layer contains a number of application functions that involve the transmission of APPLICATION
SERVICE DATA UNITS (ASDUs) between source and destination.
The application layer of this companion standards does not use explicit APPLICATION PROTOCOL CONTROL
INFORMATION (APCI). This is implicit in the contents of the ASDU DATA UNIT IDENTIFIER and in the type of link
service used.
E
GEK-106237P
MIFII Digital Feeder Relay
E-3
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