what is power system security?

Question

I need a consice definition of power system security

Answer 1

You have to consider steady-state security and dynamic security. It is the ability to provide rated voltage at rated frequency, and have enough "margin of safety". For example, an overloaded generator is a weak link in the overall security of the system, because it would be the one most likely to fail. An overloaded Tx line would probably sag so much that it might be susceptible to line-to-line faults in a wind. One way of estimating security margins (steady-state) is to run power flows at the current state of the system, and using short-term load-projections, run more power flow computations, and estimate the operating margin you have before over-load relays or transformer protection start operating and cause cascade failures.

Answer 2

Concisely:

Have a power backup!

A real answer would include not having to need a back up, i.e. protection from weather, tampering and theft with locks and limited entry.