ABB RET670 - Measuring the Trip and Time Limit for Set Values

ANSI09000021-1-en.vsd
IED test set
NI
IED
NI
V_A
V_B
V_C
V_N
V1
V2
V3
V_N
TRIP
ANSI09000021 V1 EN
Figure 44: Principle connection of the test set
Values of the logical signals belonging to the sensitive directional residual overcurrent
and power protection are available on the local HMI under Main menu/Test/Function
status/Current protection/SensDirResOvCurr(67N,IN>)/SDEPSDE(67N,IN>):x
11.5.6.1 Measuring the trip and time limit for set values
Operation mode 3I
0
· cosφ
Procedure
1. Set the polarizing voltage to 1.2 · VNRelPU and set the phase angle between voltage
and current to the set characteristic angle (RCADir). Note that the the current lagging
the voltage.
Take setting RCAComp into consideration if not equal to 0.
2. Inject current until the function picks up, and make sure that the trip current of the
set directional element is equal to the INcosPhiPU setting.
The I Dir (3I
0
· cosφ) function activates the PICKUP and PUNDIN output.
3. Assume that φ´ is the phase angle between injected voltage (3V
0
) and current (3I
0
)
i.e. φ´ = RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected
current until the function trips.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
184 Transformer protection RET670 2.2 ANSI
Commissioning manual