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Power cable connection on a mobile installation to External equipment using a MIL-DTL-38999 connector.

Samantha Rendell

So I've inherited a a mobile installation project. The power cable connection on to External control equipment uses a dedicated port with a MIL-DTL-38999 connector. 

The inrush when the charging system is engaged trips the RCD when it is set to 30mA. My predecessor determined that the connection is not classified as a socket and increased the RCD trip current to 300mA.

Given that it uses the 38999 connectors and it is solely dedicated to the dismounted control systems that form part of the system is this a valid assessment? 

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    Samantha Rendell said:
    The inrush when the charging system is engaged trips the RCD when it is set to 30mA.

    Why is the inrush so 'large', and has anyone measured the actual inrush?

    Maybe just needs a large soft iron 'ferrite bead' on the appropriate cores to either slow down that surge, or keep the 'leakage' surge in the correct [return path] cores.

    You may have a common-earth/ground problem on the DC equipment side that looks just like "diverted neutral" where superfluous bonding provides alternative paths.

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    Samantha Rendell said:
    The inrush when the charging system is engaged trips the RCD when it is set to 30mA.

    Why is the inrush so 'large', and has anyone measured the actual inrush?

    Maybe just needs a large soft iron 'ferrite bead' on the appropriate cores to either slow down that surge, or keep the 'leakage' surge in the correct [return path] cores.

    You may have a common-earth/ground problem on the DC equipment side that looks just like "diverted neutral" where superfluous bonding provides alternative paths.

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