Iec 61850 Protocol; Iec61850 Generic Substation State Event (Gsse); Remote Devices - GE F650 Instruction Manual

7 IEC 61850 PROTOCOL

7.1 IEC61850 GENERIC SUBSTATION STATE EVENT (GSSE)

7 IEC 61850 PROTOCOL 7.1IEC61850 GENERIC SUBSTATION STATE EVENT (GSSE)

7.1.1 REMOTE DEVICES

7.1.1.1 REMOTE I/O OVERVIEW
Remote inputs and outputs provide a means of exchanging digital state information between Ethernet-networked devices.
The IEC 61850 GSSE (Generic Substation State Event) and GOOSE (Generic Object Oriented Substation Event)
standards are used.
The sharing of digital point state information between GSSE/GOOSE equipped relays is essentially an extension to Flex-
Logic™, allowing distributed FlexLogic™ by making operands available to/from devices on a common communications
network. In addition to digital point states, GSSE/GOOSE messages identify the originator of the message and provide
other information required by the communication specification. All devices listen to network messages and capture data
only from messages that have originated in selected devices.
IEC 61850 GSSE messages are compatible with UCA GOOSE messages and contain a fixed set of digital points. IEC
61850 GOOSE messages can, in general, contain any configurable data items. When used by the remote input/output
feature, IEC 61850 GOOSE messages contain the same data as GSSE messages.
Both GSSE and GOOSE messages are designed to be short, reliable, and high priority. GOOSE messages have additional
advantages over GSSE messages due to their support of VLAN (virtual LAN) and Ethernet priority tagging functionality.
The GSSE message structure contains space for 128 bit pairs representing digital point state information. The IEC 61850
specification provides 32 "DNA" bit pairs that represent the state of two pre-defined events and 30 user-defined events. All
remaining bit pairs are "UserSt" bit pairs, which are status bits representing user-definable events.
The IEC61850 specification includes features that are used to cope with the loss of communication between transmitting
and receiving devices. Each transmitting device will send a GSSE/ GOOSE message upon a successful power-up, when
the state of any included point changes, or after a specified interval (the "default update" time) if a change-of-state has not
occurred. The transmitting device also sends a "hold time" which is set to four point five times the programmed default time,
which is required by the receiving device.
Receiving devices are constantly monitoring the communications network for messages they require, as recognized by the
identification of the originating device carried in the message. Messages received from remote devices include the
message "hold time" for the device. The receiving relay sets a timer assigned to the originating device to the "hold time"
interval, and if it has not received another message from this device at time-out, the remote device is declared to be non-
communicating, so it will use the programmed default state for all points from that specific remote device. This mechanism
allows a receiving device to fail to detect a single transmission from a remote device which is sending messages at the
slowest possible rate, as set by its "default update" timer, without reverting to use of the programmed default states. If a
message is received from a remote device before the "hold time" expires, all points for that device are updated to the states
contained in the message and the hold timer is restarted. The status of a remote device can be displayed. The GSSE
facility provides for 32 remote inputs and 96 remote outputs.
7
7.1.1.2 LOCAL DEVICES ID OF DEVICE FOR TRANSMITTING GOOSE MESSAGES
The device ID that identifies the originator of the message is ONLY programmed in the EnerVista 650 Setup (see Figure 7–
1:)
Setpoint > Input/Outputs > Remote Comms > 650 ID
GEK-106310AB F650 Digital Bay Controller 7-1