ABB RET670 - Page 170

• VOLTAGE = 1.29 kV
• CURRENT = 20918 A
• R = 0.89%
• X=6.42%
• ROTORANG = -3.04 rad
Note that these values identify a point inside the lens characteristic in zone 1, that is
close to the boundary between zone 1 and zone 2. The START is issued, but no TRIP
is performed.
Execution of the dynamic test
The test may be performed by using two states of a sequence tool that is a basic feature of
test sets.
• State 1: pre-test condition.
Steady voltage and current are applied in order to get a steady high impedance, that
is a point in the plane R-X which is far away from the lens characteristic. Define the
following three-phase symmetrical quantities (the phase angle is related to phase L1):
V V
V
V
V
ts t RZ
VT s
VT p
= × × = × × =0 9 0 9 1435
0 1
13 8
9 36
1
. .
.
.
.
,
,
,
EQUATION14066 V1 EN (Equation 51)
∠ =






=






=V
ForwardX
ForwardR
ts
arctan arctan
.
.
59 33
8 19
82..14°
EQUATION14058 V1 EN (Equation 52)
frequency of V
ts
= 50 Hz
I
50s
= 0 A
I
tfs
= 0 A
• State 2: main test step.
Define the following three-phase symmetrical quantities (the phase angle is related to
phase L1):
V V
V
V
V
ts t RZ
VT s
VT p
= × × = × × =0 9 0 9 1435
0 1
13 8
9 36
1
. .
.
.
.
,
,
,
EQUATION14066 V1 EN (Equation 53)
∠ =






=






=V
ForwardX
ForwardR
ts
arctan arctan
.
.
59 33
8 19
82..14°
EQUATION14058 V1 EN (Equation 54)
frequency of V
ts
= 50 Hz
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
164 Transformer protection RET670 2.2 ANSI
Commissioning manual