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
testing the communication logic for residual overcurrent protection. The current
reversal and weak-end-infeed functions shall be tested together with the permissive
scheme.
10.10.3.1
Testing the directional comparison logic function
M13926-7 v2
Blocking scheme
M13926-9 v6
1.
Inject the polarizing voltage 2U0 at 5% of
UBase
(EF4PTOC) where the
current is lagging the voltage by 65°.
2.
Inject current (65° lagging the voltage) in one phase at about 110% of the set
operating current, and switch the current off with the switch.
3.
Switch the fault current on and measure the operating time of the
communication logic.
Use the TRIP signal from the configured binary output to stop the timer.
4.
Compare the measured time with the set value
tCoord
.
5.
Activate the CR binary input.
6.
Check that the CRL output is activated when the CR input is activated.
7.
Switch the fault current on (110% of the set operating current) and wait
longer than the set value
tCoord
.
No TRIP signal should appear.
8.
Switch the fault current off.
9.
Reset the CR binary input.
10. Activate the BLOCK digital input.
11. Switch the fault current on (110% of the set operating current) and wait for a
period longer than the set value
tCoord
.
No TRIP signal should appear.
12. Switch the fault current and the polarizing voltage off.
13. Reset the BLOCK digital input.
Permissive scheme
M13926-42 v8
Section 10
1MRK 506 377-UEN C
Testing functionality by secondary injection
158
Railway application RER670 2.2 IEC
Commissioning manual
Summary of Contents for RELION RER670
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