Hitachi Relion 670 Series Commissioning Manual page 182

Section 11
Testing functionality by secondary injection
18. Instantaneously decrease the voltage in two phases simultaneously to a value 20% lower than the
set trip value (take into account the previous note if VRPVOC is configured in ACT with the
undervoltage seal-in feature).
19. Measure the definite time delay for the TRUV and TRIP signals and compare it with the set value
tDef_UV.
20. Check that pickup and trip information is stored in the event menu.
11.5.15.3 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.5.16 Average Power Transient Earth Fault Protection, APPTEF
Prepare the IED for verification of settings outlined in Section
11.5.16.1 Function revision history
Document revision
A
A
B
11.5.16.2 Verifying the signals and settings
All of the following test will assume the following CT and VT ratios, and IBase and UBase settings:
• CT ratio 1000A/1A
• Phase-to-ground VT ratio 70kV/100V
• Open Delta VT ratio (sqrt(3)*70kV)/100V
• IBase=1000A
• UBase=70kV
However, it must be noted that the secondary values given below can be used for most installations
because, usually:
1. VT rated primary voltage value is equal to the UBase setting (70kV in the given example above)
2. CT rated primary current value is equal to the IBase setting (1000A in the given example above)
Consequently these two quantities cancel each other in the calculations for the correct secondary
injected quantities. The frequency is not explicitly specified, use the rated frequency of the protected
network (either 50Hz or 60Hz) for signals given below.
Injected quantities provided below are only for the neutral current IN and the neutral voltage UN. This
assumes that these two quantities are connected to the IED on separate inputs and connected to the
176
Product revision
2.2.4
2.2.5
2.2.6
The default setting values are used in the following test procedures if not otherwise stated for
a particular test.
© 2017 - 2023 Hitachi Energy. All rights reserved
"Preparing the IED to verify
History
-
-
Binary input BLKHARM and setting tTripInterm added.
1MRK506371-UUS Rev. M
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v3
GUID-079BCF22-469C-42EA-B857-E28154EC13D9 v1
settings".
GUID-478E6788-6477-4202-A56D-D2FFC942605A v1
GUID-36A0055E-CA32-4D85-A580-59032B3AC4AE v1
Line distance protection REL670
Commissioning manual