ABB Remote I/O RIO600 Installation And Commissioning Manual page 112

Section 6
Commissioning
104
Table 72: Operation modes
Operation mode
Phase angle
IoSin
IoCos
The directional of the operation can be selected with the Directional mode setting.
Either "Non-directional", "Forward" or "Reverse" operation can be selected. The
operation criterion is selected with the Operation mode setting.
The Characteristic angle setting is used in the "Phase angle" mode to adjust the
operation according to the method of neutral point earthing so that in an isolated
network, the Characteristic angle (ϕ
= 0°.
For definitions of different directional earth-fault characteristics, see
the Directional earth-fault characteristics section.
The directional calculation module also provides the information about the direction
of fault STR DIRGENERAL during fault situation. The information is available over
GOOSE communication.
Timer
Once the Timer is activated, it activates the STR GENERAL output. The time
characteristic is according to the definite time. When the operation timer has reached
the value set by Operate delay time, the OP GENERAL output is activated. If the fault
disappears before the module operates, the reset is instantaneous and STR GENERAL
output is deactivated.
When Directional mode is set to "Non Directional", outputs OpFwd and OpRev are
activated when a fault is detected in the "Forward" or "Reverse" direction
respectively. However, these outputs are also available when Directional mode is set
to "Forward" or "Reverse".
The OP GENERAL output is available at LED 8 of SIM8F module.
The STR GENERAL and OP GENERAL outputs are available over communication.
Directional earth-fault principle
In an isolated neutral network or Peterson earthed networks it is difficult to achieve
selective earth-fault detection based on the magnitude of residual current. Such
applications demand the use of directional earth-fault detection. They are also used in
Description
The operating sectors for forward and reverse are
defined with the settings
forward angle , Min reverse angle and Max reverse
angle .
The operating sectors are defined as "forward"
when |Io| × sin (ɸ) has a positive value and
"reverse" when the value is negative.
Ɵ is the angle difference between -Uo and Io.
As "IoSin" mode. Only cosine is used for
calculating the operation current.
) = (-90°) and in a compensated network ϕ
RCA
Installation and Commissioning Manual
1MRS757488 H
Min forward angle , Max
RCA
RIO600