Characteristic angle can be set anywhere between -179° to +180°. Thus, the effective
phase angle (ϕ) for calculating the residual power considering characteristic angle is
according to the equation.
φ
= ∠ − − ∠ −
( )
( )VG IG Characteristic angle
GUID-A701B02C-78E6-4600-BC87-51096246609C V1 EN (Equation 42)
In addition, the characteristic angle can be changed via the control signal RCA_CTL. The
RCA_CTL input is used in the compensated networks where the compensation coil
sometimes is temporarily disconnected. When the coil is disconnected, the compensated
network becomes isolated and the Characteristic angle setting must be changed. This can
be done automatically with the RCA_CTL input, which results in the addition of -90° in the
Characteristic angle setting.
The value (ANGLE_RCA) is available in the monitored data view.
-VG (Polarizing quantity)
Forward area
IG (Operating quantity)
RCA = -90˚
Maximum torque line
Backward area
Minimum
operate current
Forward area Backward area
GUID-75AA11D4-D05D-4B07-9A0C-83F2D87DC1E2 V1 EN
Figure 199: Definition of relay characteristic angle, RCA = -90° in an isolated network
Characteristic angle should be set to a positive value if the operating
signal lags the polarizing signal and to a negative value if the operating
signal leads the polarizing signal.
Type of network
Recommended characteristic angle
Compensated network 0°
Ungrounded network -90°
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 413
Technical Manual
To Next Page
Loading...
