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Calculation of DC circuit breaker!

Click:419 Source::YADE ELE time: 2015-11-14
Selection condition of DC circuit breaker
(1) the voltage at the rated operating voltage, the voltage of the DC line, taking into account the reverse braking and the inverter condition, should be greater than 2 times the circuit voltage.
(2) the load current of DC line more than the rated current. For periodic load, the equivalent heating current can be considered.
(3) action current setting value is more than or equal to the circuit is in the normal operating current maximum value, for starting DC motor should be avoided motor starting current.
(4) the current setting value of the reverse flow is less than the current value of the protected object.
(5) the maximum short-circuit current may occur in the rated short circuit breaking capacity. For rising fast circuit breaker for the initial current steepness (initial di/DT) > circuits may be appeared maximum short-circuit current of the initial rise steepness.
(6) I2t < < I2t. < < a > > and the fast breaker of the fast breaker
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