ABB RED670 - Fault Locator LMBRFLO; Measuring the Operate Limit

11.13.5 Fault locator LMBRFLO
M14955-2 v7
Prepare the IED for verification of settings outlined in Section "Preparing the IED
to verify settings".
The Fault locator function LMBRFLO depends on other functions to work
properly, that is, phase selection information from distance protection function and
analog information supplied by the trip value recorder function. Check that proper
binary start
and phase selection signals are connected and voltage and current
signals are configured (parameter settings).
The result is displayed on the local HMI or via PCM600. Distances to faults for the
last 100 recorded disturbances can be found on the local HMI under Main menu/
Disturbance Records/Disturbance #n(n = 1–100)/General Information
If PCM600 is used, the result is displayed on the recording list after upload,
including loop selection information.
Table 43: Test settings
Parameter Condition
I Higher than 30% I
r
Healthy conditions U = 63,5 V, I = 0 A & ZF = 0°
Impedance |Z| Test point
Note:
•
Z
x
£ (X0 + 2 · X1)/3 For single-phase faults
•
Z
x
£ X1 For three and two phase faults
•
Z
x
£ (X0 + 2 · X1 XM)/3 For single-phase fault with mutual
zero-sequence current
Impedance angle ZF
Test angle
•
ZF arctan[(X0 + 2 · X1) / (R0 + 2R1)] For single-phase
faults
•
ZF arctan(X1/R1) For two-phase faults
11.13.5.1 Measuring the operate limit
M14955-48 v5
1. Set the test point (|Z| fault impedance and ZF
impedance phase angle ) for a
condition that meets the requirements in table
43.
2.
Subject the IED to healthy normal load conditions for at least two seconds.
3.
Apply a fault condition.
Check that the distance-to-fault value displayed on the HMI complies with
equations
108, 109 and 110
p
Z
x
X1
-------
100×=
EQUATION123 V1 EN-US (Equation 108)
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 265
Commissioning manual