Hitachi Relion 670 Series Applications Manual page 67

1MRK506375-UEN Rev. N
IL1
TRM_40.CH1(I)
UL1
TRM_40.CH7(U)
IEC17000111 V1 EN-US
Figure 23:
In order to make IED work for single phase power system, the following steps to be performed (see
Figure 23):
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.
Railway application RER670
Application manual
SMAI1
BLOCK G1AI2P
GRP1L1 G1AI1
GRP1L2 G1AI2
GRP1L1L2 G1AI3
G1AI4
GRP1N
G1N
O:1IT:3II:1
SMAI2
BLOCK G2AI2P
GRP2L1 G2AI1
GRP2L2 G2AI2
GRP2L1L2 G2AI3
G2AI4
GRP2N
G2N
O:1IT:3II:2
Typical configuration for single-phase railway supply system
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ZGTPDIS
Trip
TRIP
I2P
Logic
U2P TRZ1
TRZ2
BLOCK
BLKZ TRZ3
BLKZ1 START
BLKZ2 STZ1
BLKZ3 STZ2
STZ3
O:920IT:3II:1
Section 4
Analog inputs
BOM_4.BO1
BOM_4.BO2
IEC17000111-1-en.vsd
61