and STOPACC) and
EnaAcc
setting and it can be reset to
initial values with RSTACC input.
The maximum demand for active and reactive powers
are calculated for the set time interval
tEnergy
and
these values are updated every minute through output
channels. The active and reactive maximum power
demand values are calculated for both forward and
reverse direction and these values can be reset with
RSTDMD input.
17. Human machine interface
Local HMI
AMU0600442 v15
IEC13000239 V3 EN-US
Figure 7. Local human-machine interface
The LHMI of the IED contains the following elements
• Graphical display capable of showing a user defined
single line diagram and provide an interface for
controlling switchgear.
• Navigation buttons and five user defined command
buttons to shortcuts in the HMI tree or simple
commands.
• 15 user defined three-color LEDs.
• Communication port for PCM600.
The LHMI is used for setting, monitoring and controlling.
18. Basic IED functions
Time synchronization
M11344-3 v11
The time synchronization function is used to select a
common source of absolute time for the synchronization
of the IED when it is a part of a protection system. This
makes it possible to compare events and disturbance
data between all IEDs within a station automation
system and in between sub-stations. A common source
shall be used for IED and merging unit when IEC/UCA
61850-9-2LE process bus communication is used. For
Phasor Measurement Unit (PMU) an accurate time
synchronization is essential to allow the comparison of
phasors measured at different locations in a Wide Area
Monitoring System (WAMS).
M11345-3 v12
Precision time protocol PTP
PTP according to IEEE 1588-2008 and specifically its
profile IEC/IEEE 61850-9-3 for power utility automation
is a synchronization method that can be used to
maintain a common time within a station. This time can
be synchronized to the global time using, for instance, a
GPS receiver. If PTP is enabled on the IEDs and the
switches that connect the station are compatible with
IEEE 1588, the station will become synchronized to one
common time with an accuracy of under 1us. Using an
IED as a boundary clock between several networks will
keep 1us accuracy on three levels or when using an HSR,
15 IEDs can be connected in a ring without losing a
single microsecond in accuracy.
19. Ethernet
Access points
GUID-6E5D2696-A8EE-43E7-A94B-69C3D0612127 v2
An access point is an Ethernet communication interface
for single or redundant station communication. Each
access point is allocated with one physical Ethernet
port, two physical Ethernet ports are allocated if
redundant communication is activated for the access
point.
AP1
SFP_302
SFP_301
Device 1
AP1
SFP_302
SFP_301
Device 1
AP2
IEC16000092-1-en.vsdx
SFP_303
AP3
AP2
SFP_303
AP3
IEC16000092 V1 EN-US
Figure 8. Access points, non redundant (left) and redundant
communication (right)
DHCP is available for the front port, and a device
connected to it can thereby obtain an automatically
assigned IP-address.
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 45
© Copyright 2017 Hitachi Power Grids. All rights reserved
To Next Page
Loading...
