Abstract:IEC 61850 and IEC 61970 standards have been applied in many projects, but information is not seamless-exchange between them. This paper,according to practical project application, represents tactic of information seamless-exchange from digital substation to IEC 61970 master-station, analyzing substation SCD model and master-station CIM model and mapping between these two models.

Abstract:In order to reduce the time of the development for medium -low voltage relay protection,and improve the reliability and the technology, this paper proposes a new hardware platform DSP&ARM. On the basis of the hardware platform and RTOS, a schematic programming software platform is developed. The software and hardware architecture and design of the platform for protective relay are discussed in detail.

Abstract:This paper concludes the protection operating experiences and configuration schemes of the 700MW hydropower generators in domestic operation. A comparatively perfect typical configuration scheme for the protection of giant hydropower generators is proposed. Furthermore, several key technical issues should be considered during protection implementation are discussed for further design and implementation as references.

Abstract:The characteristics of zero sequence current in ladder ungrounded distributed power system are discussed. The zero sequence currents of two sides in connection line are analyzed in detail when line internal and external single-phase ground fault occurrence. The shortage of traditional single-phase ground fault protection principle is pointed out。The new principle is proposed based on the direction relation between zero sequence currents of two sides in connection line and the direction relation between zero-sequence differential current and zero sequence currents. The test and site operation results show the superiority of this technology.

Abstract:There will be false root in the fault location using two-terminal data if the unsynchronized date is considered. In this paper, the generation of the false root is represented. The algorithm of fault location, having no use for distinguishing the false root and using unsynchronized data of two-terminal, is introduced. It utilizes searching and iteration methods to locate the fault point according the regularity of fault component voltage along the transmission line while its astringency and the exclusivity are proved. The algorithm adopted distributed parameters which can eliminate the influence of the line capacitance is realized easily. The result of simulation shows that the algorithm has a high precision and a low sensitivity to the fault resistance, inception angle and unsynchronized data of two-terminal, while the method has a high speed of astringency.

Abstract:Taking the digital video long-distance system in supervisory and control of YANCHENG Power Company for instance, the article introduces the system architecture in terms of its applications, function and characteristics emphatically, and analyzes the system running in very great detail. That is certainly devoted to establishing the monitoring signal station without watcher and improving the managerial levels of communication automation for the power enterprise.

Abstract:This paper describes a fault's treatment process which is caused by the inconsistency of general three-phase electric energy meter and the memory. The register reading of a certain electric energy meter is different from that of the load control system. Through on-site inspection and experimental simulation analysis, the fault reason is found: the energy is not calculated in the memory when RS485 port is in the reverse situation. The fault electric energy meters are repaired and replaced, the economic losses are avoided and some suggestions are put forward to avoid the similar failures.

Abstract:For the past few years the wide application of High-voltage converters in power plants has a significant impact on traditional motor relay protection. Setting calculation for motor protection such as instantaneous overcurrent protection and under-voltage protection are carried out based on analysis of motor parameters when the system works in frequency-conversion mode. In connection with the ploblem that traditional current phasor differential protection can't be used any more when motors work in Frequency-Conversion mode, sampled value differential protection principle is presented as the main protection.

Abstract:The research of Power Quality Monitoring System in Electric Railway is introduced, and some research and application problems of the system are pointed out, according to the electric characteristics of Electric Railway in China. At the same time, combined with the demands of China Smart Grid development and the system's application, some results in system designing and researching of Power Quality Monitoring System in Electric Railway are presented..

Abstract:To resolve the problem of the frequency selective fading and ISI caused by data transmission in channel, this study proposes one communication method in low-voltage power line based on multicarrier spreading spectrum technique (researches on multicarrier spreading spectrum technique). According to the special structure of Multicarrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA,) system, this study analyses the relation of parameters configure and resumable path numbers, and the performance of system in different parameters configure and multiuser. By the simulating and comparing of the same bandwidth and measure arithmetic at last, it can obtain better performance than the direct sequence CDMA (DS-CDMA, Direct Sequence Code Division Multiple Access) and greatly promote the capacity of anti-MAI and anti-ISI in the process of transmission.

Abstract:An earth fault on a 220 kV line's phase A in 220 kV substation is occured, the dual pilot protection on both sides of line operated quickly. The following actions happen serially: switch of phase A trips and three trips happen continually, then the bus breaker failure protection operates to trip the 220 kV bus coupler, finally, bus differential protection operates to trip all breakers of 220 kV bus. In this paper, both the fault developing process and the protection's operation are analyzed in details, and the correct action is suggested for these complicated and multiple faults.

Abstract:The auto transfer devices is widely used in 110kV and other lower voltage power system, especially in the incoming line and bridge circuit breaker of the important bridge connection station. The auto transfer devices should not only coordinate with line protective devices,but also cooperate with main transformer protection and bus protection. In application, we should consider of the practical situation on site, and the relation between auto transfer devices and various protection devices, and then apply various functions of auto transfer device well.

Abstract:To resolving the problem of algorithmic complexity and low efficiency in the implement method of back/forward sweep algorithm formerly. On the basis of analyzing the techniques for power flow calculations of distribution network, the topology structure of distribution network is defined by the tree structure which consisted of special circuit branch structure and node structure.Correcting branch currents by postorded-traversing the tree structure and correcting nodal voltages by preorder-traversing the tree structure until constringency. There is no need to number the distribution network and to form admittance matrix in this implement method. The validity and accuracy of the implement method above is verified through analysis and the 33-bus system example.

Abstract:The paper introduces the function of substation indoor temperature monitoring which is based on the video monitoring unified platform of Jiangsu Electric Power Company. The control method of environmental temperature and the characteristics of control software are analyzed based on the unified platform; which provides a technical feasible way to control the substation ambient temperature with unified platform access.

Abstract:After the occurring of single-phase grounding fault of 220kV circuit near large power supply, high zero sequence voltage induces breakdown of the neutral point gap in the 110KV system's main transformer and abnormal actions of distance protection in the 110kV line. The cause of this accident is analyzed in this paper. Suggestions of mitigating zero sequence voltage and measures of preventing incorrect actions of relative protection are proposed when grounding fault occurs near the large power supply.

Abstract:The neutral spot of a 20 kV system could be connected to earth by either arc-suppression coil or low-resistance. Considering the changes brought about by the different ways the neutral spot is connected to earth to the relay protection of the 20 kV system connected to earth by low-resistance, the paper puts forward a protective configuring and setting program for the 20 kV system on the basis of its deliberate analysis and calculation of the short-circuit faults of the 20 kV system.

Abstract:The supervised and control system for substation DC source is proposed based on detail analysis of the problems in DC source supervise, control and maintenance process. This system can find DC equipment abnormal as soon as possible, so it can avoid some DC system fault that causes by equipment abnormal. The construction and implement method for the supervised and control system is described in this paper. Through applied in Lianyungang power system, good performance of the system show its validity and feasibility.

Abstract:The anti-taking degating device in substation is an important measure to prevent personal and serious facility accidents caused by incorrect operation in electric equipment running. With the help of new technologies, some new anti-taking degating devices have arisen. With the effective combination of the existed mature anti-taking degating devices and new ones, it will greatly improve the reliability of substation operating equipments operation.

Abstract:There are three kinds of the electronic measurement transformer that apply in intelligent substation: optoelectronic transformer、active electronic current transformer and weak-mode small-signal transformer. As the key equipment of digitized substation process layer, how to select the electronic transformer is the practical problem confronted in intelligent substation construction. Through the introduction of the electronic transformers manufacturers, and the investigation of the digital substation in operation, the application situation of the electric transformer are analyzed and summarized. It also compares and analyzes these transformers from many aspects such as implementation principle, reliability and economy. At last the valuable idea for reference on selection is presented.

Abstract:When MFT occurs, normal strategies can't control the furnace pressure any more. We optimize the furnace pressure control strategies .With the rotating blade's fast action, the furnace pressure can be controlled in a proper range . Practice shows the strategy works well.

Abstract:The text introduces the ultra critical pressure unit manufactured by Hitachi in Japan. aiming at a big loss of steam and low efficiency in low cylinder. using brush seal in place of traditional one . looking for the way to improve efficiency in low cylinder.

Abstract:This paper presents the whole process of vibration analysis and troubleshooting of a steam turbine generator, which exhibited oil-excited instability during load up. Through vibration measurement, fault diagnosis, site fault handling, finally, the vibration faults unit was resolved.

Abstract:Elaborated that the thermal power plant units all stop, in the situation without auxiliary startup steam,the possibility and the program of using the steam which produces by boiler oneself as the units startup steam source.

Abstract:Along with FGD system in power industry is widely applied , For FGD system reliability is put forward higher demands. The article with the actual operation and maintenance of exposure operation, exposure to the main problems of demister scaling are analyzed. Ensure demister can not only remove slurry droplets from the gas in the high levels droplets but also keep the slabs of demister clean, in order to achieve rational and economic operation in FGD system .

Abstract:Facing the global energy crisis, people are paying more and more attention to renewable energy. As the new power generation technology using renewable energy, the wind power generation technology has already gotten rapid progress in many countries. The basic form of wind power generation system, interconnection technology, the maximum wind capture as well as the low voltage ride through technology are introduced in the paper.