ABB REG670 Commissioning Manual page 170

Section 13
Testing functionality by secondary injection
164
• the point RE (R
• a point which is related to the parameter ReachZ1 (boundary between zone 1
and zone 2)
• the point SE (R
The phase angle of the test voltages is equal to:
• arctan (ForwardX/ForwardR) for tests in the quadrant 1 and 2 of the R-X plane
• arctan (ReverseX/ReverseR) -180° for tests in the quadrant 3 and 4 of the R-X
plane
• Symmetric three-phase current, where the current is the summation of two currents
that have the same magnitude, but different frequencies.
I 20918
t
I I
= = =
50 tf
2 2
GUID-F02E8D18-FF87-45BE-8142-E8FA19F6966B V1 EN-US
The first current I
50
secondary) and phase angle 0º.
The second current I
angle 180º (at the starting time of the test) and frequency:
• 49.5 Hz for the test as generator in the quadrant 1 and 2 of the R-X plane
• 50.5 Hz for the test as generator in the quadrant 3 and 4 of the R-X plane
When the trajectory of the impedance, that is seen by the protection
function, traverses the lens characteristic then a pole slipping is
detected. The present procedure avoids tests of points of the line SE-RE
that are too close to the R-axis because in that case the voltage is close
to zero and, therefore, the impedance may approach a not defined
quantity 0/0.
The accuracy of the impedance reach is ±2% of the base impedance;
that is considered while evaluating the test results.
For the test as motor the frequency current may have 50.5 Hz in the
quadrant 1 and 2 of the R-X plane and 49.5 Hz in the quadrant 3 and 4.
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
, X )
FwdR FwdX
, X )
RvsR RvsX
A
10459
=
has frequency 50 Hz, magnitude 10459 A (that is, 1.162 A
has magnitude 10459 A (that is, 1.162 A secondary), phase
tf
1MRK 502 073-UUS A
(Equation 16)
Commissioning manual