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Installation_Guide_SIAB000B0010AA_Rev. 03 24 / 32
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
10xIsmin or 2.85xIsmax continuously
20xIsmin or 5.7xIsmax for 60 seconds
25xIsmin or 7.14xIsmax for 10 seconds
3-PHASE BALANCED
10xIsmin or 2.85xIsmax continuously
20xIsmin or 5.7xIsmax for 60 seconds
25xIsmin or 7.14xIsmax for 10 seconds
3-PHASE UNBALANCED
3xIsmin or 0.95xIsmax continuously
6.5xIsmin or 1.9xIsmax 60 seconds
8xIsmin or 2.38xIsmax 10 seconds
NOTE:
It is checked that thermal image values are re-defined not to exceed the declared value
in the International Standard:
Commisioning recommendation:
•
It is recommended to use USB cable or powerbank 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.
