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SIAFxxxxxxxxxxx_Rev. 01
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Considering this description, the real thermal image that will support the relay depending on the
injection mode and injection system is shown below:
WAVE FORM
INJECTION MODE
THERMAL RESISTANCE
SINGLE PHASE P-N
4xIn continuously
20xIn during 10 seconds
70xIn during 1 seconds
3-PHASE BALANCED
4xIn continuously
20xIn during 10 seconds
70xIn during 1 seconds
3-PHASE
UNBALANCED
1xIn continuously
6.5xIn during 10 seconds
26xIn during 1 seconds
NOTE:
It is checked that thermal image values are re-defined not to exceed the declared value in the
International Standard.
Commissioning recommendation:
•
It is recommended to use Kitcom accessory for relay protection functions settings. Connect it for
setting and disconnect it for testing purpose.
•
Adjust manually current generation value without injecting current to relay, for not stressing it
during adjustment process.
•
Be sure that relay output contact is connected to generator tripping input in order to stop the
generator, hence the current injection, after reaching adjusted tripping time. This way, relay will
only withstand rated injected current during adjusted time at protection function settings, not
maintaining current injection constantly, which could become a damaging situation for relay, as
in other case, the internally handle energy will be higher than rated one.
•
Not to perform repetitive trips continuously as the stress of the relay will be increased
drastically, especially when high current is being injected on the relay.
By following these recommendations, relay should pass commissioning test successfully. If
commissioning test is performed not following these recommendations, manufacturer won’t be
responsible for relay failure.
