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In order to maintain the security and reliability of smart grid, more efficient operations of relays are required. In this paper, an innovative scheme has been introduced to distinguish the fault and power swing condition, which arise due to change of heavy load and cyber-attack. Microprocessor based relays are proposed to control circuit breakers command signal in case of power swing and fault. A...
For high-frequency resistive voltage divider, the distributed parameter model was studied and the key factors affecting its performance were discussed. The high-frequency characteristics of typical outer structure of voltage divider were simulated by ANSYS software. According to the reflection coefficient, VSWR and return loss, an optimized structure of divider for high frequency is presented.
There are two methods commonly used for the performance test of voltage divider system. Step response method is used to measure the transient response of system, and frequency response method is used to measure the amplitude-frequency characteristics and phase-frequency characteristics. This paper discusses the equivalent conversion relationship of the characteristic parameters of time-domain and...
Different from cost of financing, Cost of capital reflects the right Corporate Governance mechanism and the respect to the reward of risk of capital. But cost of capital is always confused with cost of financing in theory in China. If we take cost of financing as the discount rate in investment decision-making, it will lead to excessive investment and waste of capital, if we take it into the financing...
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