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Energy coordination is a particular type of discrimination that exploits the currentlimiting characteristics of moulded-case circuit-breakers. It is important to
remember that a current-limiting circuit-breaker is “a circuit-breaker with a break
time short enough to prevent the short-circuit current reaching its otherwise
attainable peak value” (IEC 60947-2, def. 2.3).
In practice, ABB SACE moulded-case circuit-breakers of Isomax and Tmax
series, under short-circuit conditions, are extremely rapid (tripping times of about
some milliseconds) and therefore it is impossible to use the time-current curves
for the coordination studies.
The phenomena are mainly dynamic (and therefore proportional to the square
of the instantaneous current value) and can be described by using the specific
let-through energy curves.
In general, it is necessary to verify that the let-through energy of the circuitbreaker downstream is lower than the energy value needed to complete the
opening of the circuit-breaker upstream.
This type of discrimination is certainly more difficult to consider than the previous
ones because it depends largely on the interaction between the two devices
placed in series and demands access to data often unavailable to the end user.
Manufacturers provide tables, rules and calculation programs in which the
minimum discrimination limits are given between different combinations of circuitbreakers.
Advantages:
• fast breaking, with tripping times which reduce as the short-circuit current
increases;
• reduction of the damages caused by the fault (thermal and dynamic stresses),
of the disturbances to the power supply system, of the costs...;
• the discrimination level is no longer limited by the value of the short-time
withstand current Icw which the devices can withstand;
• large number of discrimination levels;
• possibility of coordination of different current-limiting devices (fuses, circuitbreakers,..) even if they are positioned in intermediate positions along the
chain.
Disadvantage:
• difficulty of coordination between circuit-breakers of similar sizes.
This type of coordination is used above all for secondary and final distribution
networks, with rated currents below 1600A.
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