IL1
TRM_40.CH1(I)
UL1
TRM_40.CH7(U)
BOM_4.BO1
BOM_4.BO2
SMAI1
BLOCK
G1AI2P
O:1IT:3II:1
G1N
GRP1L1 G1AI1
GRP1L2 G1AI2
GRP1L1L2 G1AI3
GRP1N
G1AI4
SMAI2
O:1IT:3II:2
BLOCK
GRP2L1
GRP2L1L2
GRP2N
GRP2L2
G2AI2P
G2N
G2AI1
G2AI2
G2AI3
G2AI4
I2P
U2P
BLOCK
BLKZ
BLKZ1
BLKZ2
BLKZ3
TRIP
TRZ1
TRZ2
TRZ3
STA RT
STZ1
STZ2
STZ3
O:920IT:3II:1
ZGTPDIS
Trip
Logic
IEC17000111-1-en.vsd
IEC17000111 V1 EN-US
Figure 21: Typical configuration for single-phase railway supply system
In order to make IED work for single phase power system, the following steps to
be performed (see Figure
21):
1.
Connect IL1 current to the first and third inputs of the SMAI function block.
Set CT ratio for this analogue input accordingly (e.g. 300A/1A).
2.
Connect UL1 voltage to the first and third inputs of the SMAI function block.
Set VT ratio for this analogue input accordingly (e.g. 25kV/100V).
When such configuration is made within ACT tool using only two available
analogue input signals (i.e. UL1 and IL1), the preprocessing block will perform the
following:
• 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 forced to zero value
• Phase-to-phase values (i.e. UL1L2 and IL1L2 ) will be directly measured from
the TRM but they will have identical values as quantities for the first phase
• Positive sequence quantities (i.e. U1 and I1 ) will be forced to zero
unconditionally
• Zero sequence quantities (i.e. 2Uo and 2Io ) will be forced to zero
unconditionally
Note that in such installations, distance or under-impedance protection can only use
L1-L2 measurement loop which will then effectively measure impedance Z=UL1/
IL1. The directional overcurrent protection can also be used. Directional and non-
directional earth fault overcurrent protections and residual overvoltage protection
shall not be used in such installations. All other backup protection and
measurement functions can be used.
1MRK 506 375-UEN A Section 4
Analog inputs
Railway application RER670 2.2 IEC 63
Application manual
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