Function Revision History; Completing The Test - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.5.1

Function revision history

Document
revision
A
B
C
D
E
F
G
H
Procedure
1. Connect the test set for injection of three-phase currents and voltages to the appropriate CT
and VT inputs of the IED.
2. Inject pure negative sequence current, that is, phase currents with exactly same magnitude,
reversed sequence and exactly 120° phase displaced into the IED with an initial value below
negative sequence current pickup level. No output signals should be activated. Check under
NS4PTOC function Service Values that correct I2 magnitude is measured by the function.
3. Set the injected negative sequence polarizing voltage slightly larger than the set minimum
polarizing voltage (default 5 % of Ub) and set the injection current to lag the voltage by an
angle equal to the set reference characteristic angle (180° - AngleRCA) if the forward
directional function is selected.
If reverse directional function is selected, set the injection current to lag the polarizing voltage
by an angle equal to RCA.
4. Increase the injected current and note the value at which the studied step of the function
operates.
5. Decrease the current slowly and note the reset value.
6. Block lower set steps when testing higher set steps according to the instructions that follow.
7. Connect a trip output contact to a timer.
8. Set the injected current to 200% of the operate level of the tested step, switch on the current
and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current in order to test parameter txmin.
9. Check that all operate and start contacts operate according to the configuration (signal
matrixes)
10. Reverse the direction of the injected current and check that the step does not operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above-described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
11.4.5.2

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
92
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 Maximum value changed to 2000.0 % of IBase for IMin1, IMin2, IMin3 and IMin4
settings.
2.2.5 -
When inverse time overcurrent characteristic is selected, the operate time of the
stage will be the sum of the inverse time delay and the set definite time delay. Thus,
if only the inverse time delay is required, it is important to set the definite time delay
for that stage to zero.
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