Hitachi Relion 670 Series Applications Manual page 65
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1MRK506375-UEN Rev. N
TRM_40.CH1(I)
TRM_40.CH2(I)
UL1
TRM_40.CH7(U)
UL2
TRM_40.CH8(U)
IEC17000019 V1 EN-US
Figure 21:
It is assumed that the four analogue inputs are wired to the IED (i.e. UL1, UL2, IL1 and IL2) and
proper VT and CT ratios are set on the TRM card. Symbols used are typical for HV, two-phase power
system. Note that for AT-catenary system, some other annotations are often used as given in the
following list:
•
IL1 is current in phase L1 (catenary current for AT-system)
•
IL2 is current in phase L2 (negative feeder current for AT-system)
•
UL1 is phase L1 voltage (catenary-to-ground voltage for AT-system)
•
UL2 is phase L2 voltage (negative feeder-to-ground voltage for AT-system)
When configuration shown in Figure
•
Quantities for the first phase (i.e. UL1 and IL1) will be directly measured from the TRM
•
Quantities for the second phase (i.e. UL2 and IL2) will be directly measured from the TRM
•
Phase-to-phase values (i.e. UL1L2 = (UL1-UL2) and IL1L2 = (IL1-IL2) ) will be internally
calculated
•
Positive sequence quantities (i.e. U1 = (UL1-UL2)/2 and I1 = (IL1-IL2)/2 ) will be internally
calculated
•
Zero sequence quantities (i.e. 2Uo = (UL1+UL2) and 2Io = (IL1+IL2) ) will be internally
calculated. Note that, these two values are also known as residual quantities.
•
Alternatively, the 2Io and 2Uo quantities can be directly measured on the TRM, instead to be
internally calculated. To perform that, they shall be wired to the TRM card and then connected to
the fourth input of the respective preprocessing SMAI function block in the ACT tool.
For installations where configuration shown in Figure
functions inside IED can be used without any restrictions. Distance protection will be able to measure
and operate in all three measuring loops (i.e. L1-Gnd, L2-Gnd and L1-L2).
In some AT-catenary installation, second phase voltage UL2 (i.e. negative feeder voltage) may not be
available. In such case, refer to Section
analogue inputs. Practically, in such installations, two-phase connection is used for currents and
single-phase connection is used for voltages. Note that in such special installations, distance or
under-impedance protection can only use L1-L2 measurement loop which will then effectively
measure impedance Z=UL1/(IL1-IL2). Directional earth fault protection and residual overvoltage
protection shall not be used in such installations. All other backup protection and measurement
functions can be used.
4.2.5.2
Configuration example 2
In HV two-phase railway supply systems grounded via Petersen Coil, sometimes only one phase-to-
phase voltage may be available instead of two single-phase to ground voltages. An example on how
to configure the IED analogue inputs for such installation is shown in Figure 22.
Railway application RER670
Application manual
IL1
SMAI1
BLOCK
GRP1L1
IL2
GRP1L2
GRP1L1L2
GRP1N
O:1IT:3II:1
SMAI2
BLOCK
GRP2L1
GRP2L2
GRP2L1L2
GRP2N
O:1IT:3II:2
Typical configuration for two-phase power system or AT-catenary supply system
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G1AI2P
ZGTPDIS
G1AI1
I2P
G1AI2
U2P
G1AI3
G1AI4
BLOCK
G1N
BLKZ
BLKZ1
BLKZ2
BLKZ3
O:920IT:3II:1
G2AI2P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
21
is made, the preprocessing block will perform the following:
21
is used, all protection and measurement
Configuration example
Trip
BOM_4.BO1
TRIP
Logic
TRZ1
BOM_4.BO2
TRZ2
TRZ3
START
STZ1
STZ2
STZ3
IEC17000019-1-en.vsd
3, for configuration of voltage
GUID-DB95191C-0313-436B-8800-1E3B021FD1A8 v1
Section 4
Analog inputs
59
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