Fault Level Current

Your fault current will be approximately double in value. The danger is if the fault occurs during that 2 minutes you equipment is toast if it is not rated for the max fault condition.

The fault level will be double the current supplied by individual transformers. If your protection system is not adequate and the MCC is not designed for this fault level, it can lead to major breakdown of the system.

It has to be verified whether adequate protections are in line before such an attempt.

simple; you can do but it is a calculated risk. During paralleling, fault should not occur. Normally only momentary paralleling is allowed.

rc sachdeva

919967642157

Its simple. When you parallel two transformer and if the fault occur, the switchboard will be subjected to double the fault current. The switchboard fault withstand is defined as 1 sec rating basis. It is not advisable. But still we do the momentary paralleling i.e. paralleling through interlock; which is like instantaneous operation. There is a calculated risk in paralleling the two transformers for 2 min. Nothing will happen if there is no fault during parlleling. Operating persons do take this kind of risk when a large rated motor to be started.

rc sachdeva

09967642157

Dear Mr. Daniel,

Please check my profile and go through the thread main tie main redundant system. your question is very similar to one posted

Dear Mr. Daniel,

please check this thread http://cr4.globalspec.com/thread/48170#newcomments

Main Tie Main, redundant Bus tie breaker

Thanks

Dear Friend,

Synch. of two or more transforments needs to check and fulfilling of synch. conditions, without which there will be danger of mixing two souces of different sources roughly.

CVS Murthy