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Section 11
Testing functionality by secondary injection
p
EQUATION125 V1 EN-US
in % for single-phase-to-earth faults with mutual zero sequence current.
Where:
p
Z
X0
X1
XM
11.14.14.4
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.15
Metering
11.15.1
Pulse-counter logic PCFCNT
The test of the Pulse-counter logic function PCFCNT requires the Parameter Setting tool in PCM600
or an appropriate connection to the local HMI with the necessary functionality. A known number of
pulses with different frequencies are connected to the pulse counter input. The test should be
performed with settings Operation = On or Operation = Off and the function blocked or unblocked.
The pulse counter value is then checked in PCM600 or on the local HMI.
11.15.2
Function for energy calculation and demand handling
ETPMMTR
Prepare the IED for verification of settings as outlined in section "Overview " and section "Preparing
for test" in this chapter.
11.15.2.1
Verifying the settings
Common test equipment can be used to determine the injection of current and voltage and time
measurement.
Verification of EAFACC & ERFACC output
1.
Connect the test set for injection of three-phase currents and three-phase voltage to the
appropriate current and voltage terminals of the IED.
2.
Ensure the instantaneous values of active and reactive power from CVMMXN function block are
connected to ETPMMTR function block active and reactive power inputs.
3.
Enable the EnaAcc setting and set tEnergy as 1 minute.
4.
Activate the STARTACC input and supply the IED with three-phase currents and voltages at their
rated value.
5.
Check that the ACCINPRG signal appears continuously.
6.
Note the EAFACC and ERFACCvalue after 1 minute and compare it with calculated energy value.
274
×
3 Z
x
-------------------------------------------- - 100
×
=
×
±
X0 2 X1 XM
+
= the expected value of a distance to fault in percent
= set test point on the test set
x
= set zero-sequence reactance of a line
= set positive-sequence reactance of a line
= set mutual zero-sequence impedance of a line
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1MRK 504 165-UEN Rev. K
(Equation 133)
M14955-84 v6
SEMOD53588-1 v1
M13405-2 v7
GUID-4FC03017-93BD-4B30-A874-487BF89971D5 v1
GUID-F8F0D384-BC70-48CA-817E-EB9BFBD68A54 v3
Transformer protection RET670
Commissioning manual
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