Table of Contents
Advertisement
Section 11
Testing functionality by secondary injection
11.13.7
Function revision history
Document
revision
D
E
F
G
H
J
11.13.8
Current harmonic monitoring CHMMHAI
Prepare the IED for verification of settings outlined in Section
11.13.8.1
Verifying the signals and settings
The current can be injected using common test equipment.
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
242
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
nd
order harmonic along with injected current signal.
2
to
6
for the harmonics until 9
© 2017 - 2022 Hitachi Energy. All rights reserved
th
order current harmonics. Refer to document revision H for
th
order current harmonics.
"Preparing the IED to verify
nd
rd
th
, 3
, 4
...9
th
order.
1MRK 505 378-UEN Rev. K
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
GUID-92992D84-BDAA-436F-9D2E-3770A29EF956 v1
GUID-3C346AFB-C073-4CA8-A471-57B04D9170DE v1
th
)
GUID-C10AB22D-5FC7-47B4-B619-EAC46D1C2ECF v3
Line differential protection RED670
Commissioning manual
Advertisement
Table of Contents
