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Hi JuanGomez, Sorry for this late answer. In fact, stating in a general way that equipment should comply with IEC is not enough. My understanding is as follows: - Basically, any equipment should comply with the local (country) codes. - In addition, according to your contract with your customer...

Hi JuanGomez, Indeed IEC 62271-200 is not clear on where IAC applies or not. Based on my past experience in using these switchboards onbaord vessels, the answer is easy: even if IEC is not clear, the Internal Arc Withstand is required by some classification societies. Now, based on my new...

Davva, I've just find more information on Schneider solution (see doc. attached): It really looks like the ABB Is-limiter system. Regarding installation of the ABB Is limiter, we had investigated different solutions: - a completed seperate cubicle as you discribe, - just purchasing the...

Hi Davva! I've studied this when working for a company concurrent to ABB in the electrical propulsion business. I've been informed last year by Schneider Electric (Grenoble-France) of developments being made to propose the same type of device as the ABB Is-limiter. If you need, I could find...

Measuring the voltage across the impedance will tell you there is a ground but not where, whereas measuring the current on feeders will make it possible to say on which feeder the ground fault is located.

Hi nightfox1925, As a supplier of complete installations comprising converters and harmonic filters, I've been working on Isc calculation on marine HV networks. My conclusions are : 1. For converters: Only converters with thyristor bridges on network side (ie static frequency converters) can...

Hi Slavag! If ground fault is limited to say 5A, why use a core CT with primary current so high (75-100A)?

In fact it is not clearly explained. To understand this, it is necessary to read very carefully what is written in chapter 8.5 page 71 (especially the last paragraph): "If the effects of the primary circuit components cannot be neglected, then the impedance due to the transformer must be...

Just a little suggestion: If you know in which configuration of the network (ie which loads are connected) you really need to have the capacitors connected, why not proceed like this: - keep the generators excitation as it is (for them to control the bus voltage). - add some sequential devices...

Thanks for your help jghrist. After further researches, I found that this standard is not yet published, and no date is currently known... Regards,

Hi everybody! Currently trying to estimate the contribution to a short-circuit of synchro-converters and harmonic filters in a 6.6kV network, I've seen on the IEEE website that an article P551 as been issued in May2000, containing "Recommended Practice for Calculting AC SC Currents in...

Hi all! I am currently trying to calculate following IEC363 standard the short-circuit current on the secondary side of a distribution transfomer supplied by 3 6.6kV generators of different powers. Would any-one know if it possible to avoid using the "equivalent generator" method...

Hi! I am currently trying to calculate short-circuit currents for a 6.6kV marine network (so following IEC363 standard). I've got two main issues: 1/ What is the contribution of synchro-converters to the short-circuit? It seems that the contribution changes, depending on the operating mode...