Function Revision History; Verifying The Settings - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.5.2.1

Function revision history

Document
revision
A
B
C
D
E
F
G
H
J
11.5.2.2

Verifying the settings

1. Connect the test set for current injection to the appropriate IED phases.
If there is any configuration logic that is used to enable or block any of the four available
overcurrent steps, make sure that the step under test is enabled (for example, end fault
protection).
If 1 out of 3 currents are chosen for operation: Connect the injection current to phases L1 and
neutral.
If 2 out of 3 currents are chosen for operation: Connect the injection current into phase L1 and
out from phase L2.
If 3 out of 3 currents are chosen for operation: Connect the symmetrical three-phase injection
current into phases L1, L2 and L3.
2. Connect the test set for the appropriate three-phase voltage injection to the IED phases L1, L2
and L3. The protection shall be fed with a symmetrical three-phase voltage.
3. Block higher set stages when testing lower set stages by following the procedure described
below:
3.1. Set the injected polarizing voltage larger than the set minimum polarizing voltage (default
3.2. Increase the injected current, note the operate value of the tested step of the function
3.3. Decrease the current slowly, note the reset value and compare it to the reset ratio 95%.
160
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.4 -
2.2.5 • The harmonic restraint function changed to freeze the definite and IDMT timers.
• The maximum value of the settings IMin1, IMin2, IMin3 and IMin4 has been
decreased to 1000.0 % of IBase.
The verification of the non-directional phase overcurrent function is done as
instructed below, but without applying any polarizing voltage.
is 5% of UBase) and set the injection current to lag the appropriate voltage by an angle of
about 80° if forward directional function is selected.
If 1 out of 3 currents are chosen for operation: The voltage angle of phase L1 is the
reference.
If 2 out of 3 currents are chosen for operation: The phase angle of the phase-to-phase
voltage L1L2 is the reference for L1Phase.
If 3 out of 3 currents are chosen for operation: The voltage angle of phase L1 is the
reference.
If reverse directional function is selected, set the injection current to lag the polarizing
voltage by an angle equal to 260° (equal to 80° + 180°).
and compare it to the set value.
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1MRK 504 165-UEN Rev. K
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SEMOD56287-72 v10
Transformer protection RET670
Commissioning manual