Section 14 Checking The Directionality; Overview; Testing The Directionality Of The Distance Protection - ABB REG670 Commissioning Manual

1MRK 502 073-UUS A
Section 14
14.1
14.2
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
Checking the directionality

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.

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 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
Section 14
Checking the directionality
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