GE N60 UR Series Instruction Manual

Contents

GE N60 UR Series Instruction Manual Manual pdf 286 page image

5-172 N60 Network Stability and Synchrophasor Measurement System GE Multilin5.7 INPUTS/OUTPUTS 5 SETTINGS5VIRTUAL OUTPUT 1 ID: "Trip"VIRTUAL OUTPUT 1 EVENTS: "Disabled"5.7.5 REMOTE DEVICESa) REMOTE INPUTS/OUTPUTS OVERVIEWRemote 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) stan-dards are used.The IEC 61850 specification requires that communications between devices be implemented on Ethernet.For UR-series relays, Ethernet communications is provided on all CPU modules except type 9E.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 net-work. In addition to digital point states, GSSE/GOOSE messages identify the originator of the message and provide otherinformation required by the communication specification. All devices listen to network messages and capture data only frommessages that have originated in selected devices.IEC 61850 GSSE messages are compatible with UCA GOOSE messages and contain a fixed set of digital points. IEC61850 GOOSE messages can, in general, contain any configurable data items. When used by the remote input/output fea-ture, 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 additionaladvantages 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 61850specification provides 32 “DNA” bit pairs that represent the state of two pre-defined events and 30 user-defined events. Allremaining bit pairs are “UserSt” bit pairs, which are status bits representing user-definable events. The N60 implementationprovides 32 of the 96 available UserSt bit pairs.The IEC 61850 specification includes features that are used to cope with the loss of communication between transmittingand receiving devices. Each transmitting device will send a GSSE/GOOSE message upon a successful power-up, whenthe state of any included point changes, or after a specified interval (the default update time) if a change-of-state has notoccurred. The transmitting device also sends a ‘hold time’ which is set greater than three times the programmed defaulttime required by the receiving device.Receiving devices are constantly monitoring the communications network for messages they require, as recognized by theidentification of the originating device carried in the message. Messages received from remote devices include the mes-sage time allowed to live. The receiving relay sets a timer assigned to the originating device to this time interval, and if ithas not received another message from this device at time-out, the remote device is declared to be non-communicating, soit will use the programmed default state for all points from that specific remote device. If a message is received from aremote device before the time allowed to live expires, all points for that device are updated to the states contained in themessage and the hold timer is restarted. The status of a remote device, where “Offline” indicates non-communicating, canbe displayed.The remote input/output facility provides for 64 remote inputs and 64 remote outputs.b) LOCAL DEVICES: ID OF DEVICE FOR TRANSMITTING GSSE MESSAGESIn a N60 relay, the device ID that represents the IEC 61850 GOOSE application ID (GoID) name string sent as part of eachGOOSE message is programmed in the SETTINGS Ö PRODUCT SETUP ÖØ COMMUNICATIONS ÖØ IEC 61850 PROTOCOL ÖGSSE/GOOSE CONFIGURATION Ö TRANSMISSION ÖØ FIXED GOOSE ÖØ GOOSE ID setting.Likewise, the device ID that represents the IEC 61850 GSSE application ID name string sent as part of each GSSE mes-sage is programmed in the SETTINGS Ö PRODUCT SETUP ÖØ COMMUNICATIONS ÖØ IEC 61850 PROTOCOL Ö GSSE/GOOSECONFIGURATION Ö TRANSMISSION ÖØ GSSE ÖØ GSSE ID setting.In N60 releases previous to 5.0x, these name strings were represented by the RELAY NAME setting.NOTE