The trajectory of the impedance traverses the lens characteristic in zone 1
GUID-12F82DD8-A4CE-48C9-944B-0CF3B3F6C9F9 v1
Preliminary steady state test at 50 Hz
GUID-AA953F5F-2389-4F05-8BBD-D8DC9AF3B0E4 v1
•
Go to Main menu/Test/Function status/Impedance protection/OutOfStep(78,Ucos)/
OOSPPAM(78,Ucos):1/Outputs to check the available service values of the function block
OOSPPAM.
•
Apply 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-US
(Equation 47)
∠
=
=
=
V
ForwardX
ForwardR
ts
arctan
arctan
.
.
59 33
8 19
82..14
°
EQUATION14058 V1 EN-US
(Equation 48)
frequency of V
ts
= 50 Hz
I
I
I
I
A
s
CTs
CTp
50
50
10459
1
9000
1 162
=
×
=
×
=
.
EQUATION14059 V1 EN-US
(Equation 49)
∠
I
50s
= 0º
frequency of
I
50s
= 50 Hz
It
I
I
I
A
fs
CTs
CTp
tf
=
×
=
×
=
10459
1
9000
1 162
.
EQUATION14062 V1 EN-US
(Equation 50)
∠
I
tfs
= 0º
frequency of
I
tf
= 50 Hz
•
Check that the service values (VOLTAGE, CURRENT, R(%), X(%)) are according to the
injected quantities and that ROTORANG is close to 3.14 rad. For this particular injection
the service values are:
•
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
GUID-98707DB3-9A1A-4458-9704-25F8FCB94B79 v1
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):
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
141
Commissioning manual