Hitachi Relion 670 Series Commissioning Manual page 259

1MRK506371-UUS Rev. M
Section 12
12.1 Overview
Before starting this process, all individual devices that are involved in the fault clearance process of the
protected object must have been individually tested and must be set in operation. The circuit breaker
must be ready for an open-close-open cycle.
The directional test is performed when the protected object is energized and a certain amount of load
current is available. It is also necessary to know the flow of the load current (import or export, i.e. forward
or reverse) by help of the indication from an external instrument (energy-meter, or SCADA information).
The design of the test procedure depends on the type of protection function to be tested. Some items
that can be used as guidelines are the following.
12.2 Testing the directionality of the distance protection
The test is performed by looking at the information given by the High speed distance protection
ZMFPDIS, ZMFCPDIS or the directional function ZDRDIR or ZDMRDIR whichever is used.
Procedure:
1. Make sure that all control and protection functions that belong to the object that are going to be
energized have been tested and are set to be in operation
2. Make sure that the primary load current fulfills the following conditions (by using an external
equipment):
•
The primary load impedance must have an angle (PHI) between the setting angles for the directional
lines. In case of default settings this means:
•
•
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:
•
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:
Line distance protection REL670
Commissioning manual
Checking the directionality
The magnitude of the primary load current must be higher than the minimum operating current
set for the directional elements in the IED. In case of default settings this means:
• load current > 5% of base current
• Otherwise the settings IMinOpPG and IMinOpPP for ZDRDIR or ZDMRDIR are
available under the HMI menu: Main menu /Settings /IED Settings /Impedance
protection /DirectionalImpedance
for forward (exported) load: -15 deg < PHI < 115 deg
for reverse (imported) load: 165 deg < PHI < 295 deg
Main menu /Settings /IED Settings /Impedance protection /DirectionalImpedance
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Section 12
Checking the directionality
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