Verifying the warning and alarm time limit of
THD
,
WrnLimitTHD
and
tDelayAlmTHD
GUID-92992D84-BDAA-436F-9D2E-3770A29EF956 v1
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
GUID-3C346AFB-C073-4CA8-A471-57B04D9170DE v1
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
nd
,
3
rd
…5
th
)
GUID-C10AB22D-5FC7-47B4-B619-EAC46D1C2ECF v2
1. Supply the IED with current at rated value.
2.
Apply 2
nd
order harmonic along with injected current signal.
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
2 to 6 for the harmonics until 5
th
order.
10.12.7.2 Completing the test
GUID-EDB51B29-9556-4EF4-94E6-5DC6B8C0F13A 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.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 175
Commissioning manual
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