Table of Contents
Advertisement
1MRK 504 165-UEN Rev. K
Verifying the fault I
1.
Supply the IED with three-phase current at rated value.
2.
Ensure that the relevant settings for fault I
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
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
14.
Compare the calculated value with the set MaxI2tCmlWx value.
15.
Bring the injected three-phase currents to the rated value.
11.14.7.2
Completing the test
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.
11.14.8
Function revision history
Document
revision
D
E
F
G
H
J
11.14.9
Current harmonic monitoring CHMMHAI
Prepare the IED for verification of settings outlined in Section
11.14.9.1
Verifying the signals and settings
The current can be injected using common test equipment.
Transformer protection RET670
Commissioning manual
2
t and cumulative I
Product
History
revision
2.2.3
-
2.2.3
-
2.2.4
-
2.2.4
-
2.2.4
-
2.2.5
Updated monitoring till 9
monitoring till 5
© 2017 - 2022 Hitachi Energy. All rights reserved
2
t alarms
2
t alarm such as MaxI2tW1, MaxI2tW2 and
2
t alarm such as MaxI2tCmlW1,
2
t value.
th
order current harmonics. Refer to document revision H for
th
order current harmonics.
"Preparing the IED to verify
Section 11
Testing functionality by secondary injection
GUID-D7BF8A0C-17CC-49E3-B101-AB719D0822CC v1
GUID-8F01A787-4FDA-48BA-8045-5DC678C9410C v1
GUID-5883ADA7-549A-464B-AC60-082A50165A2B v1
GUID-692151F8-812B-4B32-AE86-E7A4E4B0101B v1
GUID-804F309E-B02F-4F6B-B0FC-2C7AE3F12DBA v2
settings".
GUID-026F1A4F-E9A8-43DC-87E1-0831E0123E50 v1
269
Advertisement
Table of Contents
