ABB RELION 620 Series Technical Manual page 207

1MAC504801-IB E
620 series ANSI
Technical Manual
For defining the operation sector, there are five modes available through the Operation
mode setting.
Table 153: Operation modes
Operation mode
Phase angle
IoSin
IoCos
Phase angle 80
Phase angle 88
The directional operation can be selected with the Directional mode setting. The
alternatives are "Non-directional", "Forward" and "Reverse" operation. The operation
criterion is selected with the Operation mode setting. By setting Allow Non Dir to "True",
non-directional operation is allowed when the directional information is invalid.
Typically, the network rotating direction is counter-clockwise and defined as "ABC". If
the network rotating direction is reversed, meaning clockwise, that is, "ACB", the
equation for calculating the negative sequence voltage component need to be changed.
The network rotating direction is defined with a system parameter Phase rotation. The
calculation of the component is affected but the angle difference calculation remains the
same. When the residual voltage is used as the polarizing method, the network rotating
direction change has no effect on the direction calculation.
The network rotating direction is set in the protection relay using the
parameter in the HMI menu: Configuration/System/Phase rotation.
The default parameter value is "ABC".
The Characteristic angle setting is used in the "Phase angle" mode to adjust the operation
according to the method of neutral point grounding so that in an isolated network the
Characteristic angle (φ
RCA
the characteristic angle can be changed via the control signal RCA_CTL, in which case the
alternatives are -90° and 0°. The operation of RCA_CTL depends on the Characteristic
angle setting.
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
the mathematical expression has a positive value
and "reverse" when the value is negative
As "IoSin" mode. Only cosine is used for calculating
the operation current.
The sector maximum values are frozen to 80
degrees respectively. Only
Min reverse angle are settable.
The sector maximum values are frozen to 88
degrees. Otherwise as "Phase angle 80" mode.
) = -90° and in a compensated network φ
Section 4
Protection functions
Min forward angle , Max
Min forward angle and
= 0°. In addition,
RCA
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