PRS-7910
34 PRS-7910
information about the IED logical device.
9.4.4.1 Digital Status Values
The GGIO logical node is available in the PRS-7000 series relays to provide access to digital
status points (including general I/O inputs and warnings) and associated timestamps and quality
flags. The data content must be configured before the data can be used. GGIO provides digital
status points for access by clients. It is intended that clients use GGIO in order to access digital
status values from the PRS-7000 series relays. Clients can utilize the IEC61850 buffered reporting
features available from GGIO in order to build sequence of events (SOE) logs and HMI display
screens. Buffered reporting should generally be used for SOE logs since the buffering capability
reduces the chances of missing data state changes. All needed status data objects are transmitted
to HMI clients via buffered reporting, and the corresponding buffered reporting control block
(BRCB) is defined in LLN0.
9.4.4.2 Analog Values
Most of analog measured values are available through the MMXU logical nodes, and metering
values in MMTR, the else in MMXN, MSQI and so on. Each MMXU logical node provides data
from a IED current/voltage “source”. There is one MMXU available for each configurable source.
MMXU1 provides data from CT/VT source 1(usually for protection purpose), and MMXU2 provides
data from CT/VT source 2 (usually for monitor and display purpose). All these analog data objects
are transmitted to HMI clients via unbuffered reporting periodically, and the corresponding
unbuffered reporting control block (URCB) is defined in LLN0. MMXUx logical nodes provide the
following data for each source:
9.4.4.3 Protection Logical Nodes
The following list describes the protection elements for PRS-7910 series relays. The specified
relay will contain a subset of protection elements from this list.
The protection elements listed above contain start (pickup) and operate flags, instead of any
element has its own start (pickup) flag separately, all the elements share a common start (pickup)
flags “PTRC.ST.Str.general”. The operate flag for _PTOC1 is “_PTOC1.ST.Op.general”. For
PRS-7000 series relays protection elements, these flags take their values from related module for
the corresponding element. Similar to digital status values, the protection trip information is
reported via BRCB, and BRCB also locates in LLN0.
9.4.4.4 LLN0 and Other Logical Nodes
Logical node LLN0 is essential for an IEC61850 based IED. This LN shall be used to address
common issues for Logical Devices. Most of the public services, the common settings, control
values and some device oriented data objects are available here. The public services may be
BRCB, URCB and GSE control blocks and similar global defines for the whole device; the
common settings include all the setting items of communication settings, system settings and
some of the protection setting items, which can be configured to two or more protection elements
(logical nodes). In LLN0, the item Loc is a device control object, this Do item indicates the local
operation for complete logical device, when it is true, all the remote control commands to the IED
will be blocked and those commands make effective until the item Loc is changed to false. In
To Next Page
Loading...
Need help?
General