Short circuit events occur in electrical systems on ship

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Short circuit: a type of incident in the electrical system due to the phenomenon of short-circuit between the phase is not in the normal mode.

In neutral grounded systems (or 4 wires), one phase or phase-to-ground contact (or neutral wire) is also called a short circuit.

- In neutral or earthed neutral systems through compensation equipment, the phenomenon of single-phase contact with ground is called ground contact. Ground currents are mainly due to the phase capacitance to ground.


short circuit in electrical system

Indirect short circuit: It is short-circuited through an intermediate resistor, consisting of the resistor by the electric arc and the resistance of the other elements in the path of the current from one phase to another or from phase to ground.

Electric arc resistance varies over time, which is often complicated and difficult to determine accurately. Experimental:

                                     R = 1000.lI [Ω]

         Where: I - short circuit current [A]

                                 l - electric arc length [m]

Direct Short Circuit: It is short-circuited through a very small, ignorable intermediate resistor (also known as a short circuit).

Short circuit symmetry: the short circuit still maintain the system, three-phase voltage in symmetry.

Short circuit asymmetry: short circuit makes the line system, three-phase voltage is not symmetrical.

- Horizontal non-symmetry: when the incident occurs at one point, the sum of the phases at that point is the same.

- Vertical symmetry: when the incident occurs, the total phase impedance at one point is not the same.

Complex faults are the occurrence of many asymmetric short circuit transients along the electrical system.