Protection Software

[pavement]

Im fairly new to the protection division of the industry and have carried out a fault level anaylsis of a marine system, which ive to then cordinate the protection of the radial feeder.Ive found the Coordonaide program from S&C Company, but I was wondering do any of the more experienced power professionals know of any additional sites that offer similiar programs for free.

Also one of the additional problems is that due to it being a 13.8kV system, and having heavy duty induction machines on the primary bus the fault currents are shown through simulation using EMTP to be in excess of 180kA.Therefore I need to determine maximum ratings for the switchgear, busbar, CT performance, cables etc is there a good source that would provide generic information that would provide a a base case to work on from.

Any additional insight into what areas that are normally looked upon upon undertaken such a design, would be much appreciated from a guy thats kinda been shoved in the deep end with the clock ticking.


Cheers lads and lassies!

 

[DanDel]

Good protection programs for free are not very common.
I seriously doubt if you have 180kA at 13.8kV. This is over 4000MVA. Most 15kV gear is rated for 500 or 750MVA. What are you using for a source and what size are your induction machines?

 

[pavement]

Sorry, should have said the 180kA was from faults in the LV 440V system, its a FPSO ship with two 48.4MVA GTA and 6 induction machines DOL started form the 13.8kV bus of magnitude 13.1MW at the worst case.

 

[rbulsara]

For less than $1500 you can buy a good software...I am sure your ship is much more worth than that..or cost of a single electrical equipment..

Convince your powers to be to invest in what is necessary....

By the way if you know impedances of your equipment, which you will have to know even if using a software, hand calculations gives pretty accrurate results..

Refer to IEEE Buff book for reference..

 

[pavement]

Cheers RBulsara, yeah got the Buff Book but already done the fault level analysis for all relevant points within the system.It more that the protection will be tuff due to backup protection, due to the high fault levels, and the need for time discrimination between the primary protection, the fault currents could be on the network too long and exceed the ratings for switchgear, busbars etc?

I think im on the right track, but if anybody could ryhme of names of manufacturers of plant like busbars, CTs where i can get generic data to get ballpark estimates on how the protection will cope within the system.

 

[advidana]

Check with cutler hammer and little fuse they use to have free simple short circuit systems and coordination software. The really complicated or large electrical systems will cost you money.

 

[rbulsara]

LV (less than 600V) gear should be available upto 200kA using fuses or fused-circuit breakers.

 

[corrosivo]

There are many software for electrical systems analysis, the cost will depend on the number of features the program have. Some can simulate +1000´s of busses others less than 100.
These are a few of the programs that might help you, some of them have demos you can use for a definite period of time.

lmphotonics.com
Power Softech International Inc.
SKM SYSTEMS ANALYSIS skm.com
netplan.com
aspeninc.com

http://www.dsapowertools.com/

etap.com

http://ic.net/~eii/

 

[pavement]

Cheers corrosivo, those links have come in very handy for this job and hopefully future ones.

Many THanks