polarizing quantity to produce the maximum torque. That is, RCA is the angle between the
maximum torque line and polarizing quantity. If the polarizing quantity is in phase with
the maximum torque line, RCA is 0 degrees. The angle is positive if the operating current
lags the polarizing quantity and negative if it leads the polarizing quantity.
Example 1
The "Phase angle" mode is selected, compensated network (φRCA = 0 deg)
=>
Characteristic angle
= 0 deg
maximum torque line
Characteristic angle = 0 deg
Non-tripping zone
Min forward angle
Min reverse angle
Min trip current
Max forward angle
Max reverse angle
IG
(tripping quantity)
Forward tripping zone
Backward tripping zone
-VG
(polarizing
quantity)
zero torque line
GUID-D491B874-769D-4D2F-9E74-2788A829E7E3 V1 EN
Figure 152:
Definition of the relay characteristic angle, RCA=0 degrees in a
compensated network
Example 2
The "Phase angle" mode is selected, solidly grounded network (φRCA = +60 deg)
=>
Characteristic angle
= +60 deg
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
333
Technical Manual
Содержание Relion 615 series
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