ABB RET670 - Page 168

Note that these values identify a point inside the lens characteristic, in the Zone 2, 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 that 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
= × × = × × =1 1 1 1 1435
0 1
13 8
11 44
1
. .
.
.
.
,
,
,
EQUATION14065 V1 EN (Equation 41)
∠ =






=






=V
ForwardX
ForwardR
ts
arctan arctan
.
.
59 33
8 19
82..14°
EQUATION14058 V1 EN (Equation 42)
frequency of V
t
= 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
= × × = × × =1 1 1 1 1435
0 1
13 8
11 44
1
. .
.
.
.
,
,
,
EQUATION14065 V1 EN (Equation 43)
∠ =






=






=V
ForwardX
ForwardR
ts
arctan arctan
.
.
59 33
8 19
82..14°
EQUATION14058 V1 EN (Equation 44)
frequency of V
t
= 50 Hz
I I
I
I
A
s
CTs
CTp
50 50
10459
1
9000
1 162= × = × = .
EQUATION14059 V1 EN (Equation 45)
∠I
50s
= 0º
frequency of I
50s
= 50 Hz
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
162 Transformer protection RET670 2.2 ANSI
Commissioning manual