In this letter, a compact monopole planar antenna with inverted F- and L-shaped strips is presented for WLAN and WiMAX applications. By adjusting the geometries and the sizes of the strips, the proposed antenna can achieve triple-band performance covering three separated impedance bandwidths of 300 MHz (2.2–2.5 GHz), 400 MHz (3.3–3.8 GHz), and 800 MHz (5.1–5.9 GHz), which are well applied for both 2.4/5.2/5.8-GHz WLAN bands and 3.5/5.5-GHz WiMAX bands. The overall dimension of the proposed antenna can reach 20 × 25.5 mm
Failure leakage of equipment or electric shock may make the residual current amplitude decrease, which
causes effective protection of the fault and the existence of dead zone of operation. This paper presents the principle of residual
current leakage protection based on vector, using residual current amplitude and residual current variation of fault
leakage protection, the realization of mutation leakage, continuous slow change leakage detection and recognition, triangle
formulas residual current variation calculation method, orthogonal decomposition calculation method and three-phase
equivalent calculation method. Through the analysis of the residual current vector variation, we put forward the corresponding
method of delayed electrical leakage protection. According to the residual current amplitude, mutation leakage,
slowly varying leakage, electric leakage comprehensive protection, we can reduce the leakage protection action area; improve
the reliability of power system.
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