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Section 11
Testing functionality by secondary injection
•
•
•
•
•
Note that these values identify a point inside the lens characteristic, in the zone 2, that is close
to the point RE. 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
ts
EQUATION14063 V1 EN-US
∠
V
EQUATION14058 V1 EN-US
frequency of V
I
50s
I
tfs
•
State 2: main test step.
Define the following three-phase symmetrical quantities (the phase angle is related to phase
L1):
V
ts
EQUATION14063 V1 EN-US
∠
V
EQUATION14058 V1 EN-US
frequency of V
I
50
s
EQUATION14059 V1 EN-US
∠I
50s
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
Expected result: start of the protection function and trip in zone 2, when trip conditions are fulfilled.
144
VOLTAGE = 10.74 kV
CURRENT = 20918 A
R = 7.37%
X = 53.40%
ROTORANG = -3.09 rad
V
VT s
,
0 9
.
V
0 9 11931
.
=
×
×
=
×
t FwdZ
,
V
VT p
,
ForwardX
=
=
arctan
ts
ForwardR
= 50 Hz
ts
= 0 A
= 0 A
V
VT s
,
0 9
.
V
0 9 11931
.
=
×
×
=
×
t FwdZ
,
V
VT p
,
ForwardX
=
=
arctan
ts
ForwardR
= 50 Hz
ts
I
1
CTs
I
10459
=
×
=
×
50
I
9000
CTp
= 0º
= 50 Hz
50s
I
1
CTs
I
10459
=
tf
×
=
×
9000
I
CTp
= 180º
= 49.5 Hz
tfs
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0 1
.
77 81
.
V
×
=
13 8
.
59 33
.
=
arctan
82. . 14°
8 19
.
0 1
.
77 81
.
V
×
=
13 8
.
59 33
.
=
arctan
82. . 14°
8 19
.
= .
1 162
A
1 162
.
A
=
1MRK 504 165-UEN Rev. K
GUID-028D7D67-B61A-4A7F-9978-4A0A41231B04 v1
(Equation 35)
(Equation 36)
(Equation 37)
(Equation 38)
(Equation 39)
(Equation 40)
Transformer protection RET670
Commissioning manual
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