152
Scheme communication
Chapter 11
Verifying settings by secondary
injection
12.3
Local acceleration logic (PLAL)
Prepare the IED for verification of settings as outlined in
section 1 "Overview"
and
section 2
in this chapter.
The logic is checked during the secondary injection test of the impedance measuring zones.
Procedure
1.
Provide the terminal with conditions equivalent to normal load for at
least two seconds.
2.
Deactivate the conditions for accelerated function.
3.
Apply a phase to earth fault at 100% of line impedance.
4.
Check that the fault is tripped with the second zone time delay.
5.
Provide the terminal with conditions equivalent to normal load for at
least two seconds.
6.
Activate the condition for accelerated function either by the
auto-recloser or by the loss of load.
7.
Apply a phase to earth fault at 100% of line impedance.
8.
Check that the fault is tripped “instantaneously”.
9.
Continue to test another function or end the test session by chang-
ing the test mode setting to off.
12.4
Scheme communication 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.
Before testing the communication logic for residual overcurrent protection, the four step residual
overcurrent protection (PEFM) has to be tested according to the corresponding instruction. Once
this is done, continue with the instructions below.
If the current reversal and weak-end-infeed logic for earth-fault protection is included, proceed
with the testing according to the corresponding instruction after the testing the communication
logic for residual overcurrent protection. The current reversal and weak-end-infeed functions
shall be tested together with the permissive scheme.
12.4.1
Testing the directional comparison logic function
Blocking scheme
Procedure
1.
Inject the polarizing voltage 3U0 at 5% of UBase (directional TEF)and
the with the current lagging the voltage by 65
°
.
Summary of Contents for RELION REL670
Page 8: ...Contents ...
Page 72: ...64 About this chapter Chapter 9 Establishing connection and verifying the LON communication ...
Page 174: ...166 Remote communication Chapter 11 Verifying settings by secondary injection ...
Page 190: ...182 Maintenance Chapter 13 Fault tracing and repair ...
Page 198: ...190 Glossary Chapter 14 Glossary ...
