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Section 11
Testing functionality by secondary injection
Verifying the warning and alarm time limit of THD, WrnLimitTHD and tDelayAlmTHD
1.
Supply the IED with current at rated value.
2.
Apply harmonics at the numerical multiple of fundamental frequency along with the injected
current signal.
3.
Slowly increase the harmonic amplitudes until the THDWRN signal appears.
4.
Compare the harmonic amplitude level value with the set warning limit value.
5.
Continue to inject the same level of harmonics level until the THDALM signal appears and note
down the time from THDWRN set to THDALM set.
6.
Compare the noted time value with the set time limit value of alarm.
Verifying the warning and alarm time limit of TDD, WrnLimitTDD and tDelayAlmTDD
1.
Supply the IED with current at rated value.
2.
Apply harmonics at the numerical multiple of fundamental frequency along with the injected
current signal.
3.
Slowly increase the harmonic amplitudes until the TDDWRN signal appears.
4.
Compare the harmonic amplitude level value with the set warning limit value.
5.
Continue to inject the same level of harmonics level until the TDDALM signal appears and note
down the time from TDDWRN set to TDDALM set.
6.
Compare the noted time value with the set time limit value of alarm.
Verifying the warning and alarm time limit of individual harmonic distortions IHD,
WrnLimit#HD and tDelayAlm#HD (where # = 2
1.
Supply the IED with current at rated value.
2.
Apply 2
3.
Slowly increase the harmonic amplitude until the 2NDHDWRN signal appears.
4.
Compare the harmonic amplitude level value with the set warning limit value.
5.
Continue to inject the same level of harmonics level until the 2NDHDALM signal appears and
note down the time from 2NDHDWRN signal set to 2NDHDALM signal set.
6.
Compare the noted time value with the set time limit value of alarm.
7.
Repeat Steps
11.14.9.2
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.
11.14.10
Function revision history
Document
revision
D
E
F
G
H
J
270
nd
order harmonic along with injected current signal.
2
to
6
for the harmonics until 9
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
nd
rd
th
, 3
, 4
...9
th
order.
th
order voltage harmonics. Refer to document revision H for
th
order voltage harmonics.
1MRK 504 165-UEN Rev. K
GUID-92992D84-BDAA-436F-9D2E-3770A29EF956 v1
GUID-3C346AFB-C073-4CA8-A471-57B04D9170DE v1
th
)
GUID-C10AB22D-5FC7-47B4-B619-EAC46D1C2ECF v3
GUID-EDB51B29-9556-4EF4-94E6-5DC6B8C0F13A v1
GUID-E828F930-88FF-4D5B-8304-2BD3B89919B8 v1
Transformer protection RET670
Commissioning manual
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