Recent content by Marcopolo

  1. M

    Connection between copper and titanium

    Thank you. The second site gives some info. I will dig deeper.
  2. M

    Connection between copper and titanium

    Hello, this will be the connection between a converter's DC bus to a hydrogen electrolysis stack. The converter has copper busbar, whereas the stack titanium. Does anyone have any experience or know the contact resistance between titanium and copper or tinned copper or nickel plated copper?
  3. M

    Connection between copper and titanium

    Hello, I am currently investigating how to connect copper busbars or cables to a titatium busbar on a DC voltage system. What are the requirements/standards?
  4. M

    Calculation of resistors for premagnetizing a transformer

    Existing situation: 3150kVA transformer, 11kV/450V no load losses 6300W. Existing premagnetizing resistors with power losses 322kW for 5s. Due to increase in power demand, a new transformer has to be installed: 11kV/470V no load losses 8500W. Would the above mentioned resistors be enough? And...
  5. M

    Screening of a 3phase cable

    3 core 50sqmm 22kV upstream the transformer
  6. M

    Screening of a 3phase cable

    I have a 3 phase cable with overall and individual screens. The cable goes from a switchboard to a transformer. How do I connect the overall screen and the individual screens? Connect on swbd side and at transformer loose?
  7. M

    Earth fault on a TN-S system

    I know, I am waiting for some pictures myself. I am actually wondering if on this configuration TN-S, an earth fault protection is really needed.
  8. M

    Earth fault on a TN-S system

    I have no pictures, however it seems the cable is damaged along the way, not at the terminations. Sorry for misleading.
  9. M

    Earth fault on a TN-S system

    The damage was on the terminations.
  10. M

    Earth fault on a TN-S system

    The cable downstream the 50A breaker and the trip on 630A breaker
  11. M

    Earth fault on a TN-S system

    To add, I think the 346A setting for the current is too high. Since the cable is likely not designed to withstand this amount of current even for a short period, hence the ~126A damaged it. @davesparks so an earth fault caused a cable damage, tripping the whole 630A supply tripped due to this...
  12. M

    Earth fault on a TN-S system

    Unfortunately I don't know the earth fault level that caused the damage.
  13. M

    Earth fault on a TN-S system

    Thank you, was thinking of settings rather similar. However I am concerned about the fact the feeder downstream the 50A breaker which got damaged at 126A earth fault.
  14. M

    Earth fault on a TN-S system

    Hello, thanks, I am well aware of what you mentioned. The point is that the 50A breaker only has thermal and magnetic protections, not earth fault. At first I thought it was a coordination issue ast the settings are as follows: For 630A breaker LT 0,66xIn @ 6s ST 3xIn @ 0.1s G 0,2xIn @ 0.1s For...
  15. M

    Earth fault on a TN-S system

    It is an mccb abb tmax t6ss630 with trip unit pr222ds/pd-lsig

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