Section 14
Checking the directionality
288
The primary load impedance must have an angle (PHI) between the setting angles
for the directional lines. In case of default settings this means:
•
for forward (exported) load: -15 deg < PHI < 115 deg
•
for reverse (imported) load: 165 deg < PHI < 295 deg
The settings for forward load: - ArgDir < PHI < ArgNegRes and the settings for
reverse load: 180 deg - ArgDir < PHI < 180 deg + ArgNegRes included in the
directional functions ZDRDIR or ZDMRDIR are available under the HMI menu:
•
Main menu/Settings/IED Settings/Impedance protection/
DirectionalImpedance
3.
The directionality of the load current is shown by the High speed distance
protection ZMFPDIS or ZMFCPDIS under the HMI menu: Main menu/Test/
Function status/Impedance protection/HighSpeedDistance or by the directional
function ZDRDIR or ZDMRDIR and it is available under the HMI menu: Main
menu/Test/Function status/Impedance protection/DirectionalImpedance
The following will be shown if the load current flows in forward (exporting)
direction:
•
L1Dir = Forward
•
L2Dir = Forward
•
L3Dir = Forward
The following will be shown if the load current flows in the reverse direction
(importing):
•
L1Dir = Reverse
•
L2Dir = Reverse
•
L3Dir = Reverse
Compare this result with the information given by the external equipment, it must
be the same. If the direction of the three phases is not the same, this is a sign of
incorrect connection of the voltage or current transformers serving the distance
protection function. It is also possible that there is a wrong setting for the earthing
point for one or more of the CTs serving distance protection (the setting name is:
CTStarPoint available under the HMI menu:Main menu/Configuration/Analog
modules).
If the directional function shows forward when it should show reverse (or vice-
versa) for all the three phases, this probably means a wrong connection of CTs
and/or VTs serving the distance protection, or it can mean a wrong setting of
earthing point (the setting name is : CTStarPoint) for all the three CTs, or it could
mean a wrong setting for the pre-processing blocks (3PhaseAnalogGroup under
the HMI menu: Main menu/Configuration/Analog modules) connected to the
CTs/VTs and serving the distance protection (verify that no wrong negation has
been set; the setting name is: Negation).
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
1MRK 502 073-UUS A
Commissioning manual