Table 287: 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| x sin (ANGLE) has a positive value and
"reverse" when the value is negative. ANGLE is
the angle difference between -Uo and Io.
IoCos As "IoSin" mode. Only cosine is used for
calculating the operation current.
Phase angle 80 The sector maximum values are frozen to 80
degrees respectively. Only
Min forward angle
and
Min reverse angle
are settable.
Phase angle 88 The sector maximum values are frozen to 88
degrees. Otherwise as "Phase angle 80" mode.
Polarizing quantity selection "Neg. seq. volt." is available only in
the "Phase angle" operation mode.
The directional operation can be selected with the Directional mode setting. The
user can select either "Non-directional", "Forward" or "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, that is, when the magnitude of the polarizing quantity is less
than the value of the Min operate voltage setting.
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 IED using the parameter
in the HMI menu: Configuration/System/Phase rotation.
The default parameter value is "ABC".
If the Enable voltage limit setting is set to "True", the magnitude of
the polarizing quantity is checked even if Directional mode is set to
"Non-directional" or Allow Non Dir to "True".
Section 4 1YHT530004D05 D
Protection functions
276 615 series
Technical Manual
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