Hitachi Relion 670 Series Applications Manual page 64

Section 4
Analog inputs
Where:
1)
2)
3)
4)
5)
4.2.5 Example of analogue configuration for railway applications
Protection and control IED RER670 is designed to be used in two-phase railway power supply
systems. However, it can also be used as a protection and control device in single-phase railway
supply systems with appropriate configuration of the analogue inputs. Thus, even catenary protection
can be arranged. The IED can be used in railway supply systems with rated frequency of 16.7Hz,
50Hz and 60Hz. Examples for internal analogue configurations of IED are given in following sections
for some typical installation types used in the railway industry. They shall be used in order to ensure
best possible performance of the IED for particular type of installation.
4.2.5.1 Configuration example 1
An example on how to configure the IED analogue inputs for HV, two-phase railway power system,
including AT-catenary railway supply system is shown in Figure 21.
58
shows how to connect the secondary side of the residually connected VT to one VT input on the IED.
+2U0 shall be connected to the IED
is the TRM where this voltage input is located. It shall be noted that for this voltage input the following
setting values shall be entered:
VTprim=132kV
VTsec=100V
Inside the IED, only the ratio of these two parameters is used. It shall be noted that the ratio of the
entered values exactly corresponds to ratio of one individual VT.
shows that in this example the first three input channel of the preprocessing block is not connected in
SMT tool or ACT tool.
shows the connection made in Signal Matrix Tool (SMT), Application configuration tool (ACT), which
connect this voltage input to the fourth input channel of the preprocessing function block 5).
is a Preprocessing block that has the task to digitally filter the connected analog input and calculate:
• fundamental frequency phasors for all four input channels
• harmonic content for all four input channels
• zero sequence quantities by using the fundamental frequency phasors for the fourth input channel
These calculated values are then available for all built-in protection and control functions within the IED,
which are connected to this preprocessing function block in the configuration tool. For this application
most of the preprocessing settings can be left to the default values.
The under-impedance protection function is used in all given examples. However, all
other protection and measurement functions shall be configured in the same way.
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Railway application RER670
Application manual