Consider a 50-Hz power system which consists of two areas (A and B) connected by

Question

Consider a 50-Hz power system which consists of two areas (A and B) connected by a tie-line as shown in Figure 1. Initially, the system operates at the rated frequency, the tie-line is unloaded and the switch is at position 1. The system does not have any frequency sensitive load. When the load in Area B is suddenly increased by 5 MW, the tie-line flow from Area A to Area B increases to 1 MW 2 switch a) If the switch is at position 1 and the frequency response characteristic, BA for Area A is 10 MW/Hz, find the change in system frequency, f after the load change. Hence, determine the frequency response characteristic, BB for Area B. b) If the switch is moved to position 2 after the load change (i.e. the tie- line is tripped), find the steady-state frequency in Area A. Also, find the steady-state frequency in Area B. (Use the value of ßs found in part (a) [Hint: Ask yourself what is the corresponding NET change in generator mechanical power, P in each area after the load change. After that, determine change in frequency, f]. Assume Pref-0

Explanation / Answer

I will recommend him to buy Model A for following reasons:

1)Model A specifies measurement of body temperature of healthy person (98.6 deg.F) and model 2 specifies measurement of body temperature of sick person and temperature below 100 deg.F .So measuremet specifications are almost same

2) Modwl A has a response time of 1.25 seconds which is better than model 2 which is 2 seconds.

3) Model A costs $65 while Model 2 costs $ 95.Model A is cheaper.

Hence i will recommend him to buy Model A

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