Checking That The Binary Inputs And Outputs Operate As Expected; Measuring The Operate Value For The Negative Sequence Function - ABB RET670 Commissioning Manual
Relion 670 series, transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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Section 11
Testing functionality by secondary injection
11.9.2.1
11.9.2.2
222
Checking that the binary inputs and outputs operate as expected
1.
Simulate normal operating conditions with the three-phase currents in phase
with their corresponding phase voltages and with all of them equal to their
rated values.
2.
Connect the nominal dc voltage to the DISCPOS binary input.
•
The signal BLKU should appear with almost no time delay.
•
The signals BLKZ and 3PH should not appear on the IED.
•
Only the distance protection function can operate.
•
Undervoltage-dependent functions must not operate.
3.
Disconnect the dc voltage from the DISCPOS binary input terminal.
4.
Connect the nominal dc voltage to the MCBOP binary input.
•
The BLKUand BLKZ signals should appear without any time delay.
•
All undervoltage-dependent functions must be blocked.
5.
Disconnect the dc voltage from the MCBOP binary input terminal.
6.
Disconnect one of the phase voltages and observe the logical output signals
on the binary outputs of the IED.
BLKU and BLKZ signals should appear simultaneously wether the BLKU
and BLKZ reset depends on the setting SealIn "on" or "off". If "on" no reset,
if "off" reset.
7.
After more than 5 seconds disconnect the remaining two-phase voltages and
all three currents.
•
There should be no change in the high status of the output signals
BLKU and BLKZ.
•
The signal 3PH will appear.
8.
Establish normal voltage and current operating conditions simultaneously and
observe the corresponding output signals.
They should change to logical 0 as follows:
•
Signal 3PH after about 25ms
•
Signal BLKU after about 50ms
•
Signal BLKZ after about 200ms
Measuring the operate value for the negative sequence function
Measure the operate value for the negative sequence function, if included in the
IED.
1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
M1405-9 v8
M1405-46 v12
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