Hands on GOOSE analyisis

The GOOSE protocol

GOOSE is a  IEC 61850 messaging system used by IEDs and mission critical applications to tell about substation events , such as commands, alarms, indications and measurements.

Since the GOOSE messages replace hard wired signals used for protection and control applications IEC 61850 introduces mechanisms that ensure the delivery of the required information. Capturing GOOSE with Zeus is an extension of the multi stream analysis performed by these units: Captured frames will be the outcome of matching the incoming traffic with the Port A filtering blocks.

Zeus and xGenius

Both provide deep insights to design, install, maintain, troubleshoot and engineer communications resources of Mobile Operators, Power Utilities, Finace, Labs and R+D centers . The unit is able to verify Ethernet/IP, SyncE, PTP, GbE, IRIG B, 1PPS, T1/E1, G703, Serial Datacom, C37.94, GOOSE, SV, MMS, Round trip & One way Delay tests at all interfaces. It also has a set of programmable filters to capture live data traffic at wire speed.

Fig 1. Tester capturing GOOSE packets for analysis.

Zeus & xGenius enable Ethernet traffic capture at wirespeed by adding precise time stamps obtained from a time reference (GNSS, ToD, IRIG B) when available.

Protocol analysis

The protocol analyzer permits to find out the frame structure, content and the time sequences of the GOOSE traffic captured thanks to time stamped marks. The Event logger of the testers facilitates the access to Global counts, statistics and LEDs provide information about which events and how many of them have been registered but they do not say too much about how they are distributed in time. These information is supplied at the Event Logger a graphical representation tool that permits to trace the evolution of key parameters. Traceable Events are categorized in different classes. Moreover, each test port has its own traceable events. These events may be different for each test port.

You can display the trace of the evolution of the previously selected parameters:

• View and analyze the details of the histogram
• Set the scale at your preferred zoom level
• Selected the filter A1 to display a http://www.netime.com/more detailed diagram about the captures
• Click on the screen to know the exact value at one specific time
  

  Fig 2. GOOSE screen