7-2 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
7.1 IEC 61850 GENERIC SUBSTATION STATE EVENT (GSSE) CHAPTER 7: IEC 61850 PROTOCOL
7.1.2 Remote communication
The IEC 61850 specification includes features that are used to cope with the loss of communication between transmitting
and receiving devices. Each transmitting device sends a GSSE/GOOSE message upon a successful power-up, when the
state of any included point changes, or after a specified interval, four times the Hold Time setting value, if a change-of-
state has not occurred.
Receiving devices are constantly monitoring the communications network for the messages they require, as recognized
by the identification of the originating device carried in the message. If the receiving relay has not received another
message from the originating device when the specified timeout period elapses, the remote device is declared to be non-
communicating, so it uses the programmed default state for all points from that specific remote device.
If a message is received from a remote device before the interval of four times the Hold Time expires, all points for that
device are updated to the states contained in the message. The status of a remote device can be displayed.
Remote inputs and outputs provide a means of exchanging digital state information between Ethernet-networked devices.
The GSSE facility provides for 32 remote inputs and 64 remote outputs.
7.1.3 GSSE configuration
GSSE messages contain a number of double point status data items. These items are transmitted in two pre-defined data
structures named DNA and UserSt. Each DNA and UserSt item is referred to as a 'bit pair'. GSSE messages are transmitted
in response to state changes in any of the data points contained in the message. GSSE messages always contain the same
number of DNA and UserSt bit pairs. Depending on the configuration, only some of these bit pairs may have values that
are of interest to receiving devices.
The relay provides 32 "DNA" bit pairs that represent the state of two pre-defined events and 64 "UserSt" bit pairs, which are
status bits representing user-definable events.
GSSE service can be configured using the EnerVista 650 Setup program in the menu Setpoint > Input/Outputs > Remote
Comms.
Remote Comms must be set to "GSSE" to enable GSSE configuration.
650 ID represents the IEC 61850 GSSE application ID name string sent as part of each GSSE message. This string identifies
the GSSE message to the receiving device.
Hold time is used to calculate the interval, if a change-of-state has not occurred, that the device waits to send GSSE
message.
Remote Device (1 to 32) is used to select specific remote devices by entering the exact identification (ID) assigned to these
devices. A maximum of 32 devices can be configured for receiving GSSE messages.
Bit Pair (1 to 32) is used to assign the data from the GSSE message to remote inputs.
To Next Page