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The Design and fabrication of 550kV AC resin impregnated paper (RIP) Oil-SF6 immersed bushings has been in progress nowadays in China. However, in practice, two prominent difficulties in design process have been encountered: on the one hand, due to the undertaking ultra high voltage, the condenser of bushings withstands immense electrical stress which may cause partial discharge and electrical aging...
In this study, a tunable distributed-feedback (DFB) diode laser based photoacoustic spectroscopy (PAS) system was proposed for the purpose of detecting carbon monoxide CO dissolved in power transformer oil. According to the HITRAN 2008 molecular spectroscopic database, a characteristic absorption line at 6380.3012 cm−1 was selected as the molecular spectral line of CO gas. CO detection characteristics,...
The design, assembly and testing of a multi-sensor platform that could be used to detect specific parameters of ambient environment is presented in this paper. This platform will be packaged using System-Level integration and could be used as one of the nodes in a sensor network. It is composed of commercial off-the-shelf components, which allows low cost and flexible component selection. The sensors...
In current centralized building climate control, occupants do not have much opportunity to intervene the automated control system. This study explores the benefit of using thermal comfort feedback from occupants in the model predictive control (MPC) design based on a novel dynamic thermal sensation (DTS) model. This DTS model based MPC was evaluated in chamber experiments. A hierarchical structure...
Interior permanent-magnet (IPM) machines are desirable for electrical vehicles due to high power density and good flux-weakening capability. This paper focuses on the approaches to reduction of magnet eddy-current loss in IPM machines with a pole/slot ratio of 2/3, taking a 16-pole/24-slot machine as an example. By comparing permanent-magnet losses between a surface-mounted magnet machine and an IPM...
Current thermal comfort models (Fanger's model or adaptive thermal comfort model) predict thermal sensation in a steady state environment. There has been increasing interests in developing models of dynamic thermal sensation (DTS) due to transient environment conditions, e.g., sudden ambient temperature changes. In this paper, we develop a data-driven Hammerstein-Wiener (HW) model to characterize...
ZnO varistors are wildly used in power system and electronic system to protect equipments against surges and over-voltage. As there is none series gap in ZnO arresters, the ageing phenomenon of ZnO varistors has attracted great attention. In order to study the principle of pulse degradation of ZnO varistors, the thermally stimulated current (TSC) characteristic, voltage-current (U-I) and pulse electro-acoustic...
ZnO varistors have high nonlinearly which are widely utilized in protecting power systems and electronic devices against the dangerous over-voltages or surges. In this paper, the thermally stimulated current (TSC) characteristic and U-I characteristic performance of aging ZnO varistors had been investigated in different aging conditions(impulse current amplitude, impulse time). Based on the experimental...
This paper concerned on the influence of acoustic velocity change on the pulsed electro-acoustic (PEA) space charge measurement. The space charge measurement results of an air gap and low density polyethylene (LDPE) samples have been compared under different temperature respectively. According to the experimental results, it was found that acoustic velocity of test samples changes with the increasing...
This paper proposes new idea to establish condition monitoring model based IEC61850 and IEC61970 for the need of the development of intelligent power network, introduces several main methods of condition monitoring, puts forward condition monitoring integrated model in view of IEC61850 and IEC61970 own structure characteristics.
ZnO varistors have high nonlinearity, which are widely utilized in protecting power systems and electronic devices against the dangerous over-voltages or surges, and the ac aging characteristic of ZnO varistors is widely concerned. In this paper, the thermally stimulated current (TSC) characteristic, U-I characteristic and power loss characteristic performance of aging ZnO varistors have been investigated...
The paper aims at exploring the relation between phosphatase activity and pH in landfill, optimizing the experiment condition of phosphatase in landfill on the basis of the soil enzymology and studying the characteristics of three kinds of phosphatase under different stages of refuses decomposition. The results show that the activities of Acidic Phosphatase (ACP) and Alkaline Phosphatase (AKP) activity...
We present a proof-of-concept MEMS affinity sensor that measures the changes in dielectric properties of poly(acrylamide-ran-3-acrylamidophenylboronic acid) (PAA-ran-PAAPBA) polymer due to its specific, reversible binding with glucose. This sensor comprises capacitive electrodes sandwiching a solution of PAA-ran-PAAPBA polymer. Binding with glucose induces changes in the permittivity of the polymer,...
Shared resources in a chip multiprocessors (CMPs) pose unique challenges to the seamless adoption of CMPs in virtualization environments and high performance computing systems. While sharing resources like on-chip last level cache is generally beneficial due to increased resource utilization, lack of control over management of these resources can lead to loss of determinism, faded performance isolation,...
The space charge distributions of different ZnO varistors have been investigated using pulsed electro-acoustic (PEA) method in this paper. There were 8 kinds of ZnO varistors samples sintered under 4 different sintering temperatures with two formulas. According to the experimental results, it was found that there is space charge distribution when the sample is applied with a DC voltage, and the space...
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