ABB Remote I/O RIO600 Installation And Commissioning Manual page 111

1MRS757488 H
RIO600
Installation and Commissioning Manual
Io
Uo
Directional
calculation
GUID-0D426ECF-B058-45BB-8B5D-CF16C170BEB4 V1 EN
Figure 58: Functional module diagram
Level detector
The magnitude of the operating quantity is compared with the Start value setting and
the magnitude of the polarizing quantity is compared with the Voltage start value. If
both limits are exceeded, the Level detector sends an enabling signal to the timer
module.
The direct measured residual current or calculated residual current can be used for
fault detection. The selection can be set with Io signal Sel available in the general
parameter setting.
The Abs Hyst Oper Qty and Abs Hyst Pol Qty settings can be used for preventing
unnecessary oscillations in STR GENERAL and OP GENERAL output if the
operating and/or polarizing quantity is slightly above or below the Start value setting.
After leaving the hysteresis area, the start condition has to be fulfilled again and if it
is not sufficient, the signal returns to the hysteresis area.
Directional calculation
The directional calculation module monitors the angle between the polarizing
quantity and operating quantity. When the angle is in the operation sector, the module
sends the enabling signal to the timer module.
The minimum signal level which allows the directional operation is fixed to Min
operate current as 1 A and Min operate voltage as 500 V.
The convention used in the phasor diagrams representing the operation of DEFPTOC
is reversed, that is, the polarizing quantity Uo in the phasor diagrams is -Uo.
For defining the operation sector, there are three modes available through the
Operation mode setting.
Timer
t
Level
detector
Section 6
Commissioning
Op general
Str general
Str dirGeneral
103