Scheme Communication - ABB RET670 Commissioning Manual
Transformer protection version 2.1 ansi
Hide thumbs
Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
Table of Contents
Advertisement
Section 10
Testing functionality by secondary injection
10.11
Scheme communication
10.11.1
Scheme communication logic for residual overcurrent protection
ECPSCH (85)
Prepare the IED for verification of settings as outlined in section
section
"Preparing for test"
Before testing the communication logic for residual overcurrent protection function ECPSCH (85),
the four step residual overcurrent protection function EF4PTOC (51N/67N) 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 ground-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.
10.11.1.1
Testing the directional comparison logic function
Blocking scheme
1.
Inject the polarizing voltage 3V0 at 5% of
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
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
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
12.
Switch the fault current and the polarizing voltage off.
13.
Reset the BLOCK digital input.
204
in this chapter.
tCoord .
No TRIP signal should appear.
tCoord .
No TRIP signal should appear.
"Requirements"
VBase (EF4PTOC, 51N67N) where the current is
tCoord .
1MRK 504 154-UUS B
SEMOD53569-1 v1
M13926-2 v5
and
M13926-7 v2
M13926-9 v5
Commissioning manual
Advertisement
Table of Contents
