ABB Remote I/O RIO600, Installation And Commissioning Manual

Page: 112 / 312

Table 72: Operation modes
Operation mode Description
Phase angle The operating sectors for forward and reverse are
defined with the settings
Min forward angle, Max
forward angle, Min reverse angle and Max reverse
angle.
IoSin 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.
IoCos As "IoSin" mode. Only cosine is used for
calculating the operation current.
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
RCA
) = (-90°) and in a compensated network ϕ
RCA
= 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
Section 6
1MRS757488 H
Commissioning
104 RIO600
Installation and Commissioning Manual