How does your system react to short circuits? Most plant operators cannot answer this question unless they have a detailed short circuit study conducted.

SUBCOE is able to provide clients with computer simulated short circuit studies to help determine equipment suitability or device coordination.

Typically systems have this done when they are first built. After many years of operation the plant utility is very different to what was initially designed. Once changes to the client system have been made or changes have been made to the utility supplying that system any information that was provided at the time of build is no longer valid.

SUBCOE system modeling is able to conduct short circuit studies to meet both ANSI and IEC standards. This means that wherever your plant is and whatever standard it was built to, SUBCOE can provide you with valuable information to safeguard your investment.

Short circuit studies should be conducted when:

• Substantial changes to the utility supply have been made
• Modifications to existing systems are being planned
• Protective relaying is being upgraded or changed

SUBCOE provided short circuit studies can be used to determine any or all of the following:

• Calculate protective device close and latch capability
• Determine protective device interrupting capability
• Protect equipment from large mechanical forces
• I2t protection for equipment (thermal stress)
• Selecting settings or ratings for relay coordination

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