Verifying the through fault detection
GUID-148CA255-735B-42B3-9046-AD91B20DB261 v1
1.
Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for through fault detection such as
W1I>
,
W2I>
and
W3I>
are
set correctly.
3.
Ensure that the BLOCK and INHIBIT inputs are not activated.
4.
Set
tMin
as 0 s to check the start level of through fault detection.
5.
Slowly increase any phase current of any winding until ALARM signal appears.
6.
Compare the injected phase current value with the set threshold limit value.
7.
Bring the injected three-phase currents at the rated value.
8.
Change the
tMin
setting to a particular value.
9.
Slowly increase any phase current of any winding to the threshold limit and wait until the
ALARM signal appears.
10.
Compare the wait time with the set
tMin
value.
11.
Bring the injected three-phase currents to the rated value.
Verifying the fault I
2
t and cumulative I
2
t alarms
GUID-D7BF8A0C-17CC-49E3-B101-AB719D0822CC v1
1.
Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for fault
I
2
t
alarm such as
MaxI2tW1
,
MaxI2tW2
and
MaxI2tW3
are set correctly.
3.
Ensure that the BLOCK and INHIBIT inputs are not activated.
4.
Slowly increase any phase current of any winding until ALARM signal appears.
5.
Continue to inject the same level of current until the I2TALM signal appears.
6.
Compute the time between the ALARM signal raise to I2TALM signal raise and multiply with the
squared injected current.
7.
Compare the calculated value with the set
MaxI2tWx
value.
8.
Bring the injected three-phase currents to the rated value.
9.
Ensure that the relevant settings for fault cumulative
I
2
t
alarm such as
MaxI2tCmlW1
,
MaxI2tCmlW2
and
MaxI2tCmlW3
are set correctly.
10.
Slowly increase any phase current of any winding to the threshold limit and wait until the
ALARM signal appears.
11.
Continue to inject the same level of current until the CMLI2TALM signal appears.
12.
Compute the time between the ALARM signal raise to CMLI2TALM signal raise and multiply
with the squared injected current.
13.
Add the calculated value with previously calculated
I
2
t
value.
14.
Compare the calculated value with the set
MaxI2tCmlWx
value.
15.
Bring the injected three-phase currents to the rated value.
11.13.7.2
Completing the test
GUID-8F01A787-4FDA-48BA-8045-5DC678C9410C v1
Continue to test another function or end the test by changing the
TestMode
setting to
Off
. Restore
connections and settings to their original values, if they were changed for testing purposes.
11.13.8
Function revision history
GUID-5883ADA7-549A-464B-AC60-082A50165A2B v1
Document
revision
Product
revision
History
D
2.2.3
-
E
2.2.3
-
F
2.2.4
-
G
2.2.4
-
Table continues on next page
Section 11
1MRK 511 403-UEN Rev. L
Testing functionality by secondary injection
196
Bay control REC670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Содержание REC670
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