Measuring The Operate Limit; Completing The Test; Limit Counter L4Ufcnt - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.12.5.1
10.12.5.2
10.12.6
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection

Measuring the operate limit

1. Set the test point (|Z| fault impedance and ZF impedance phase angle ) for a
condition that meets the requirements in table 20.
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 46, 47 and
Z
x
×
------ - 100
p =
X1
EQUATION123 V1 EN
in % for two- and three-phase faults
×
3 Z
= ×
p x 100
+ ×
X0 2 X1
EQUATION124 V1 EN
in % for single-phase-to-earth faults
×
3 Z
x
-------------------------------------------- - 100
p =
× ±
X0 2 X1 XM +
EQUATION125 V1 EN
in % for single-phase-to-earth faults with mutual zero sequence current.
Where:
p = the expected value of a distance to fault in percent
Z = set test point on the test set
x
X0 = set zero-sequence reactance of a line
X1 = set positive-sequence reactance of a line
XM = set mutual zero-sequence impedance of a line

Completing the test

Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.

Limit counter L4UFCNT

The Limit counter function L4UFCNT can be tested by connecting a binary input to
the counter and applying pulses to the counter. The speed of the pulses must not
exceed the cycle time of the function. Normally the counter will be tested when testing
the function that the counter is connected to, such as the trip function. When the
48
×
Section 10
(Equation 46)
(Equation 47)
(Equation 48)
185