ABB RELION REX640, Техническое руководство, Страница: 160 / 1960

voltage. For the voltage sensor, all parameters are readable directly from its
rating plate and/or sensor routine test protocol, and conversions are not
needed.
Figure 57: Example of ABB voltage sensor KEVA 17.5 B21 rating plate
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 set to "Voltage sensor". The
VT connection parameter is set to the "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 94: Example setting values for voltage sensor
Setting Value
Primary voltage 10 kV
VT connection Wye
Voltage input type 3=Voltage sensor
Division ratio 10000
3.13 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
Chapter 13.1 Module diagrams
in this manual.
In harsh industrial environments binary inputs are exposed to contamination. This
causes a thin film of insulating sulfidation, oxidation, or contaminates on the
surface of the contacts. Film must be removed to establish circuit continuity. Binary
inputs have an oxide-burn feature to create a high wetting current impulse to burn
off oxidation layer when the threshold is reached. Input wetting current is reduced
to a steady-state current when oxide-burn is completed.
In BIO1001 and BIO1003 modules oxide-burn feature can be disabled only on binary
input 14 to use it as pulse counter input. The pulse counter input is enabled by
setting the parameter
Input 14 counter-mode in Configuration > I/O modules >
Slot # > Input filtering. When enabled, the pulse counter input has dedicated
Input
Basic functions 1MRS759142 F
160 REX640
Technical Manual