Binary Inputs - ABB RELION REX640 Technical Manual

Section 3
Basic functions
3.13
148
Hz, the highest value that the relay is able to measure before the current sensor input
is saturated is smaller than the maximum setting value of the current protection.
Table 74: Maximum current protection setting values
Application nominal current
(I )
n
...1250 A
1250...2500 A
2500...4000 A
Voltage sensor setting example
The voltage sensor is based on the resistive divider or capacitive divider principle.
Therefore, the voltage is linear throughout the whole measuring range. The output
signal is a voltage, directly proportional to the primary voltage. For the voltage sensor
all parameters are readable directly from its rating plate and conversions are not
needed.
In this example the system phase-to-phase voltage rating is 10 kV. Thus, the Primary
voltage parameter is set to 10 kV. For protection relays with sensor measurement
support the Voltage input type is always set to "Voltage sensor" and it cannot be
changed. The same applies for the VT connection parameter which is always set to
"WYE" type. The division ratio for ABB voltage sensors is most often 10000:1. Thus,
the Division ratio parameter is usually set to "10000". The primary voltage is
proportionally divided by this division ratio.
Table 75: Example setting values for voltage sensor
Setting
Primary voltage
VT connection
Voltage input type
Division ratio

Binary inputs

The binary inputs are mainly assembled in groups of three inputs that have one
common connection. The binary inputs are bipolar so the common connection can be
tied to ground or to supply voltage. Input groups are isolated from each other and from
the secondary side. In addition, there can be groups with only one input. For more
information, see the Module diagrams
Every binary input has an oxide-burn feature, that is, wetting current. The oxide-burn
feature can be disabled only on binary input 14 that can be used as a pulse counter
input.
Rated secondary value with 80 A/
0.150 V at 50 Hz
1.000...46.875 mV/Hz
46.875...93.750 mV/Hz
93.750...150.000 mV/Hz
Value
10 kV
Wye
3=Voltage sensor
10000
section in this manual.
1MRS759142 C
Current protection maximum setting
value not to be exceeded
40 × I (Also the maximum of the
n
start value setting range)
20 × I
n
12.5 × I
n
REX640
Technical Manual