The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Insulation failure is a significant driver of failures in electromagnetic coils, which are used, for example, in motor and solenoid applications. A promising method of assessing the health of insulation in electromagnetic coils is the use of broadband terminal impedance measurements. Previous research has focused on the resonant frequency of the coil impedance response as a feature to reflect insulation...
Intermittent earth faults occur frequently in urban distribution networks, causing overvoltage in the whole system. This paper first presents the distribution characteristics of transient overvoltage caused by intermittent earth faults. Overvoltage level at the end of a sound line turns to be higher than that of the faulted line. In resonant grounding system with Petersen coil based on thyristor controlled...
To improve the “substation owner” control mechanism and support the conversion of substation operation and maintenance (O&M) operators to “substation owner”, in this paper, an architecture of substation dashboard oriented to O&M center is designed, which brings about integration of multiple O&M systems and collaborative operations of substations. A unified information platform is established...
Smart grid demonstration projects are being carried out all over the world, but none of them involves integrated demonstration of large island-based power grid. This paper analyzes the demand for smart grid in Hainan, proposes a 4-layer technical architecture including generation, transmission, distribution, and consumption. On this basis, the core business of the overall technical architecture is...
The regional smart grid demonstration project in Hainan is a comprehensive integration demonstration project involving the whole Hainan power grid. Based on smart grid construction need analysis, this paper proposes a comprehensive integrated technology framework which includes generation, transmission, transformation, distribution and charging technology of electric vehicle. Then, the content of...
To improve the operation and maintenance (O&M) efficiency and equipment management, CSG developed a cockpit system used in O&M centers. This system is an integrated platform for O&M of substations. It integrates multiple disciplines, provides a unified information platform, standardizes all service interfaces, and coordinates all the services. This way, it provides one-stop support for...
Fault prediction for power equipment allows the maintenance personnel to know the operation conditions and the fault to be occurred in advance so as to reduce the risk of fault and the economic loss. The current fault prediction methods are generally based on physical model or stochastic model, which are used to evaluate the remaining life of equipment. However, in fact, there are many interference...
It is important to consider diagnostic coverage (DC) of the automatic diagnosis (AD) scheme in course of the design of highly reliable systems in which redundancy technique is usually applied. Considering the nature of AD is to introduce some form of redundancy, its performance will be affected by common cause failure (CCF). Due to that diversity is an effective antidote for CCF, it is desirable to...
Designs an Intelligent electronic control seat belt retractor, witch integrated controller area network (Controller Area Network, CAN) communications, millimeter-wave radar technology, micro electro-mechanical systems (MEMS) sensor technology and embedded processing technology. The millimeter-wave radar warning signal, MEMS accelerometer information, occupants status and CAN bus data, trigger the...
As a member of Real-Time Ethernet(RTE) family, EPA is the first independent intellectual property field bus national standard of China and listed as Common Profile Family 14(CPF14) of IEC 61784-2 Real-Time Ethernet application principles. Performance indicators (PI) shall be used to specify capabilities of an RTE end device and a RTE communication network as well as to specify requirements of an application...
In this paper, the current status and necessity of interoperability test for Ethernet for Plant Automation (EPA) is introduced. The interoperability test principle and test method are described in detail, and the testing process is presented in the test platform at last. This research provides approaches for the interoperability of EPA products.
Safety Instrumented Systems (SIS) are automatic systems designed for the purpose of taking an action to avoid an accident or minimize its consequences. Safety Instrumented System relies on many devices that must work as designed at a specific point in a hazard scenario to stop propagation of the hazardous event. Safety Programmable Logic Controller (PLC) plays a more and more important role in the...
An improved function block based redundancy approach is proposed in this paper. The structure, link organization and data synchronization of improved function block are described. Furthermore, the non-redundancy model, the corresponding device-level redundancy model and improved function block based redundancy model are analyzed in quantitatively. For 1-0-2 type system, improved function block based...
Generally the application of traditional adaptive control algorithm relies on the mathematic model of system. But mathematic models of some dynamic systems are difficult to establish. According to this actual problem and the existing structure of algorithm, an improved Model Free Adaptive control algorithm based on neural network is put forward in this paper. Within corresponding controller, equivalent...
A wide-area damping control system (WADC) has recently been developed by China southern power grid (CSG), to enhance the damping performance of inter-area oscillations in CSG. It's the first time that PMU measurements are used as input to a continuous feedback control system in a real bulk power grid. The WADC uses modulation of two HVDC systems for power system damping. The control system comprises...
This paper make a brief introduction to overload capability of HVDC, and show the necessity and feasibility of using overload capability of HVDC in China Southern Power Grid. Overload capability of Tian-Guang HVDC and Gui-Guang HVDC transmission systems and its practical use in China Southern Power Grid are analyzed. Some problems in the practical use are pointed out and solutions to these problems...
The super-heated temperature system is a typical element with high-order inertia process in thermal power plant. Especially in case of load changing, the parameters show obvious time-varying^ uncertain and nonlinear property, which markedly reduces the quality of the traditional PID cascade control. MFAC is an advanced control strategy with exellent self-turn and robustness. However, the drawback...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.