Table of Contents
Advertisement
Section 12
Testing functionality by secondary injection
12.3.1.2
12.3.2
12.3.2.1
106
8.
Connect the timer and set the current to twice the operate value.
9.
Switch on the current and note the operate time.
10. Check in the same way the measuring circuits connected to the CTs on the LV
side and other current inputs to the transformer differential protection.
11. Finally check that trip information is stored in the event menu.
Information on how to use the event menu is found in the
operator's manual.
12. If available on the test set, a second harmonic current of about 20% (assumes
15% setting on I1/I2 ratio parameter) can be added to the fundamental tone in
phase L1. Increase the current in phase L1 above the start value measured in step
6. Repeat test with current injection in phases L2 and L3 respectively.
The balancing of currents flowing into and out of the differential zone is checked
by primary injection testing, see section "".
Fifth harmonic blocking can be tested in a similar way.
For more detailed formulas please refer to the application
manual.
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.
High impedance differential protection HZPDIF
Prepare the IED for verification of settings outlined in section
section
"Preparing for test"
Verifying the settings
1.
Connect single-phase or three-phase test set to inject the operating voltage. The
injection is done across the measuring branch.
The required trip and alarm voltage, as well as the used
stabilizing resistance value must be set in the function. Note as
well that used CT input in the IED must have ratio set as 1:1. This
is essential for the measurement of the expected value. Normally
in this chapter.
1MRK502053-UEN B
"Requirements"
Generator protection REG670 2.0 IEC
Commissioning manual
and
Advertisement
Table of Contents
Troubleshooting
