154
Scheme communication
Chapter 11
Verifying settings by secondary
injection
6.
Switch the fault current on (110% of the setting) and measure the op-
erating time of the EFC logic.
Use the TRIP signal from the configured binary output to stop the timer.
7.
Compare the measured time with the setting for tCoord.
8.
Activate the BLOCK digital input.
9.
Switch the fault current on (110% of the setting) and wait for a period
longer than the set value tCoord.
No TRIP signal should appear.
10. Switch the fault current and the polarizing voltage off.
11. Reset the CR binary input and the BLOCK digital input.
12.4.2
Completing the test
Continue to test another function or end the test by changing the test mode setting to off.
12.5
Current reversal and weak end infeed logic for residual
overcurrent protection (PSCH, 85)
Prepare the IED for verification of settings as outlined in
section 1 "Overview"
and
section 2
in this chapter.
First, test the time delayed residual overcurrent protection according to the corresponding in-
struction. Then continue with the instructions below.
Logical signals for current reversal and WEI logic for residual overcurrent protection are avail-
able under menu tree:
Test\Functio status\Current protec-
tion\ResidualOverCurrent4Step(PEFM,51N/67N)\TEFnn
12.5.1
Testing the current reversal logic
Procedure
1.
Inject the polarizing voltage 3U0 to 5% of UBase (directional TEF)
and the phase angle between voltage and current to 155
°
, the current
leading the voltage.
2.
Inject current (155
°
leading the voltage) in one phase to about 110%
of the setting operating current (IN>Dir).
3.
Check that the IRVL output is activated after the set time (tPickUp).
4.
Abruptly reverse the current to 65
°
lagging the voltage, to operate
the forward directional element.
5.
Check that the IRVL output still is activated after the reversal with a
time delay that complies with the setting (tDelay).
6.
Switch off the polarizing voltage and the current.
Содержание RELION REL670
Страница 8: ...Contents ...
Страница 54: ...46 Checking the optical connections Chapter 6 Checking the external optical and electrical connections ...
Страница 72: ...64 About this chapter Chapter 9 Establishing connection and verifying the LON communication ...
Страница 78: ...70 Downloading settings and configuration from a PC Chapter 10 Configuring the IED and changing settings ...
Страница 174: ...166 Remote communication Chapter 11 Verifying settings by secondary injection ...
Страница 190: ...182 Maintenance Chapter 13 Fault tracing and repair ...
Страница 198: ...190 Glossary Chapter 14 Glossary ...