Novatech Bitronics M87X Series, Manual

Page: 159 / 184

ML0021 August 15, 2018
143
Copyright 2018 Bitronics, LLC
Example 2. Ethernet, using GOOSE:
GOOSE is a function defined within the context of the IEC-61850 standard but there is no
requirement to make use of any other aspect of 61850 just to use GOOSE for cross-
triggering 70 Series IEDs. Due to the level of multi-vendor support for IEC-61850, cross-
triggering between 70 Series IEDs, microprocessor based relays, and other devices may
be an advantage of using GOOSE for cross-triggering. If a broader use of IEC-61850 is
not intended, however, the user may find cross-triggering via GSSE (see Example 3) just
as effective and somewhat simpler to set up.
In a broader application of IEC-61850, GOOSE could be used for much more than what is
described in this example, but when applied simply for cross-triggering, it can be
envisioned as a method to communicate a binary status over an Ethernet medium, exactly
analogous to status and control performed by discrete I/O points (see Example 1).
GOOSE messages are reliable enough to be used for controlling interlocks and protective
relay blocking schemes, and can be propagated even faster than discrete digital contacts
because of the time that it takes for moving mechanical parts to operate.
GOOSE operates by means of publication and subscription to unsolicited,
unacknowledged, multicast (sometimes anycast) messages on an Ethernet LAN, so
GOOSE messages can not pass through a router into another network. In its simplest
form, such a network could consist of as little as an Ethernet switch and the inter-triggered
IEDs connected via conventional Cat. 5 cables. There is no need to uplink into any wider
LAN or to operate with any other clients or servers on the network (except for the purpose
of configuring the IEDs). So in a substation, security could be accomplished easily just by
restricting physical access to the network.
Otherwise, when used in a secure general purpose network, GOOSE messaging can
coexist unobtrusively with other network traffic including file transfer services useful for
collecting the recordings captured by the IEDs.
Connection:
The M87x must be fitted with one of the available Ethernet options and be connected to a
Local Area Network (LAN). The minimum hardware requirement for an M87x to support
61850 is 64MB SDRAM on the Host Processor. Older units built with 16MB SDRAM can
either be upgraded with a new Host Processor Card (H11 or H12), or else cross-triggering
could be accomplished via GSSE (see Example 3) instead of GOOSE.
Configuration:
As implemented on the 70 Series IED, IEC-61850 requires two separate software
programs to configure. These are the
IED Configurator (used to set up functions specific
to 61850, like defining Datasets, GOOSE publication and subscription, etc.) and the 70
Series Configurator (for trigger logic, recorder settings, and other legacy functions). Both
programs are supplied at no cost with the M87x and are also available for download from
the company’s public FTP site.