Table of Content

25 September 2017, Volume 39 Issue 9

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Interval integration design for in situ relay protection of transformer substation

ZHAO Qian1,2, ZOU Lei1,2, CHEN Fufeng1,2, XUE Mingjun1,2, GONG Shimin1,2, LI Yuping1,2

2017, 39(9):  1-5. 

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Facing the in situ integration demands of relay protection of transformer substation, this paper carried out integration and optimization design for the relay protection devices of medium and high voltage lines in transformer substation, which integrated distributed bus protection, merging units, intelligent terminals, measuring and controlling function, etc. This design scheme mainly adopted the methods of physical integration of devices and independent functional modules. Through analyzing and testing, this design scheme could improve the reliability and realtime performance of protection sampling, reduce the number of devices and cabinets, increase information processing efficiency and simplify wiring in smart substations.

Influence of series compensated double circuits on the same tower zerosequence component to relay protection

XUE Mingjun1,2, WANG Yuting1,2, CHEN Fufeng1,2, ZOU Lei1,2, ZHANG Xiang1,2, CHEN Shi1,2

2017, 39(9):  6-9. 

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Utilizing installed series capacitor double circuits on the same tower grounding failure zero sequence network, the influence of the zerosequence power direction element and zero sequence differential protection on the two sides protection installation is analyzed in the case of high resistance failure at the outlet of the string and the failure of the MOV. Analysis indicated that series compensation capacitor may lead to far away from the side of series compensation protection of zero sequence power direction relay from action, as a protection of high resistance earth fault zerosequence differential protection sensitivity and the lower even refused to move. The simulation test verifies the correctness of the theoretical analysis and puts forward the principle of the main protection.

Utilization of uniform strength beams device to verify accuracy of noncontact strain measuring system study

JIN Hongze, KONG Chuiyu, GUO Ningbo

2017, 39(9):  10-12. 

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Full field strain was measured by noncontact strain measuring system in homemade uniform strength beams device. The result was compared and analyzed with calculated value. And the result proved that noncontact strain measuring system accurately measured strain of uniform strength beams.

Acoustic agglomeration dust removal online test device development and application

XIE Jiankun, CHU Hao, XIA Ruifang, SHU Zhongping

2017, 39(9):  13-15. 

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To solve the problem of existing power plant dust removal equipment has difficulty on removing micrometer and submicrometer particulate matter, acoustic agglomeration dust removal online test device was developed based on acoustic agglomeration theory and flow field transformation simultaneous separation. Primary test and research used power plant desulfurized flue gas. The influence of acoustic agglomeration on PM10 grain size distribution and demister outlet total dust mass density was analyzed. This provided test evidence for application of acoustic agglomeration in industrial area.

Coalfired unit primary frequency modulation performance increasing study

NI Xinyu, SHI Zheng, FANG Li

2017, 39(9):  16-19. 

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In ultrahigh voltage power gird receiverside, primary frequency modulation became more and more important. Large scale coalfire power is responsible for primary modulation, but many units cannot achieve expected performance, and problems barely can be detected by performance tests. By analyzing tested units, prohibition and frequency modulation counter action logic was indicated. Corrected sliding pressure curve, which increases frequency modulating ability, and corrected feedforward coefficient was provided. This could be referred by different kind of unit.

Transformer insulation aging diagnosis based on D-S evidence theory

XU Yinqing

2017, 39(9):  20-22. 

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To effectively evaluate transformer insulation aging, the evaluation model based on fuzzy mathematics and D-S evidence theory was indicated. By the method of no power failure detecting transformer insulation status, four parameters were measured. These four parameters were fuzzed through membership function into four independent evidence bodies. And diagnostic result was calculated by the powerful uncertain information process ability of D-S evidence theory. Multiple allocations proved the effectiveness of this model.

Full master localized transformer protection realization plan

HU Bing1,2, GUO Xiao1,2, CHEN Fufeng1,2, LI Yuping1,2, XING Wu1,2, WANG Zhe1,2

2017, 39(9):  23-26. 

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To enhance the speed and reliability of existing intelligent substation transformer protective device, a full master type distributed localized transformer protection plan was introduced. Protection submachine was provided to each side of transformer. Submachines communicated with each other by internal high speed loop network. Each submachine was equipped with full protective function. Switch will be tripped through cable if protection behavior activated. Based on the overall plans comparison, triple layer network communicating mechanism, remote humanmachine interface and other key technologies were discussed.

Foreign large scale thermal power plant auxiliary power system study

YANG Guanglei, ZHANG Bangbin

2017, 39(9):  27-30. 

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Based on the research and study on a few foreign power plants, different kinds of wiring methods of auxiliary power system were analyzed. The application of common segment and necessity of special standby was discussed. After comparing the economical efficiency of two solutions, anappropriate wiring method for power plants in southeast Asia region was indicated. This wiring method was approved feasible by simulation in simulink.

New and existing distributed control system replacement discuss

XIAO Sheng1, GUO Bochun2

2017, 39(9):  31-33. 

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Distributed control system (DCS) reformation proposal shall fundamentally better than existing system. Different suppliers will increase the complexity. Hardware distribution, software configuration and cable wiring design was analyzed and studied. This could be referred for reformation of similar type DCS.

Direct air cooling system fan frequency converter group water cooling system study

CUI Chao

2017, 39(9):  34-35. 

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Direct air cooling system frequency converter usually aligned concentratedly, and often caused over temperature alarm in summer. After cause analysis, the plan that adds water cooling system was introduced. Actual operation proved that this plan is effective and able to save energy and prolong converter lifespan.

Fan gearbox lubricant cleanliness control strategy

ZHANG Lifeng

2017, 39(9):  36-38. 

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Gearbox is one of the core components of fan. Lubricant filter system will help maintaining lubricant cleanliness, and extend fan gearbox lifetime, increase transmission efficiency. Gearbox lubricant impurity and harm was analyzed. By lubricant quality test, effectiveness of online filer system and offline fine filter system was indicated. Method to control lubricant cleanliness was summarized.

Application of computing type pH analysis meter in nuclear power plant

GAO Wei1, XING Jiehua1, ZENG Mingmin2

2017, 39(9):  39-41. 

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An interference factor of traditional pH analysis meter analyzing pure water was introduced. Difficulties of nuclear power plant low conductivity water pH value measuring were analyzed. Based on the special requirement of pH analysis meter of pressurized water reactor nuclear power plant, it was indicated that computing type pH analysis meter was able to satisfy the position of chemical supervision in pressurized water reactor nuclear power plant. The application situation and application future of pH analysis meter in pressurized water reactor nuclear power plant was summarized.

Coalfired power plant in Vietnam soft clay layer foundation pretreatment plant and construction study

HUANG Chengbin, ZHOU Zhengyi, LI Jinfeng

2017, 39(9):  42-44. 

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The site of a power plant in Vietnam was selected on southwestern coastal alluvial plain, based on the geological exploration report, there was 10.75 to 22.00m clay and silt clay exists in site shallow subgrade. This layer of clay is widespread, low intensity and high deformation, which seriously threatened the structural safety of power plant. During the construction plan discussion phase, soft clay foundation pretreatment plan was discussed based on the different bearing capacity requirements and different construction progress. This paper introduced the pretreatment plan and its discussion progress. Which could be referred for similar problem.

Reason analysis and restoring treatments of face destruction for a certain concrete face rockfill dam

XU Zenghui1, ZHANG Chenliang2, WU Jicai2

2017, 39(9):  45-47. 

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In the first phase construction process of a certain hydropower station, structural damage and cracks appeared on the face. In this paper, the face destruction was checked and the damage reasons were analyzed firstly. After that, some face restoring treatments were proposed according to the stress features of concrete face and local actual conditions. After the restoring, the deformation of concrete face became stable and the leakage was controlled within the permissible range. At last, this paper summarized the problems that need attention in face restoring process and provided a reference for similar construction project of concrete face rockfill dam.

Study on post evaluation system of power transmission and transformation project considering the new situation of power reform

JIN Bowen, WANG Guangzeng

2017, 39(9):  48-51. 

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For the problems of no unified post evaluation system of China’s power transmission and transformation project was established and no new requirement of power reform was reflected, this paper conducted a thorough study on post evaluation system of power transmission and transformation project considering the new situation of power reform. Firstly, it analyzed the influences of power reform on the post evaluation system of power transmission and transformation project and extracted post evaluation indexes that adapted to power reform. Secondly, combining the provisions of State Grid on post evaluation of fixed asset investment projects,it proposed a comprehensive post evaluation method of power transmission and transformation project based on post evaluation indexes, which were selected from the aspects of preliminary work, preparation stage evaluation and procedure evaluation etc. Lastly, the effectiveness of the study were verified by instance analysis.

Technoeconomic analysis of 350MW heating unit that using ultrasupercritical parameters

HAO Yunyan

2017, 39(9):  52-53. 

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The 350MW supercritical steam turbine is the main type for domestic large heating unit at present, and there is a constant dispute whether its economy could be improved by increasing steam parameters to ultrasupercritical parameters. Combining the analysis conclusions of turbine plants, this paper analyzed the technical feasibility of 350MW heating unit using ultrasupercritical parameters, the rationality of initial parameters selection and the economy of equipment investment and operation cost. And provided a reference for the reasonable ultrasupercritical parameters selection of 350MW unit.

Domestic 600MW supercritical coalfired unit variable load denitration reconstruction technology analysis

SHI Zhongxi, ZHANG Jinzhu

2017, 39(9):  54-57. 

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With the economic growth of China slowed down, the total generation capacity and thermal power unit utilization rate is lowered year by year. The load of thermal power generation units maintains low level for constantly, and frequently start and stop. Due to the operating condition and environmental requirements, power plant variable load denitration is imperative. By analyzing and comparing kinds of 600MW supercritical coalfired unit variable denitration technical approaches, the most suitable approach for coalfired unit was recommended.

Thermal power plant waste water zeroemission technology proposal

LIU Jin

2017, 39(9):  58-62. 

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To realize thermal power plant waste water zero emission, technology of desulfurization waste water preprocess, desulfurization waste water concentrated treatment and tail strong brine evaporative crystallization was compared. The propitiated proposal was selected. Postprocessed condensate water could be used as industrial water, and realized power plant water treatment system closetype circulating. There is not any water discharged. Waste water zero emission was realized.

Civil sludge incineration disposal flue gas cleaning process study

ZHANG Hui, KONG Hua

2017, 39(9):  63-66. 

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The component of civil sludge is complicated. Besides moisture, large quantity of pathogenic bacteria, parasite, pathogenic microorganism, and arsenic, copper, chrome, mercury, and other toxic matter exist in civil sludge. Casually disposing untreated sludge will cause new pollution and waste resources. Harmfree treatment of civil sludge has been already a critical environmental project for each level government and administration. By analyzing the component of civil sludge, and studying on incineration disposal, a recommended proposal was provided.

Coalfired power plant flue gas denitration catalyst harmfree treatment and reuse technology study

WANG Lele, YAO Yan, WANG Lipeng, YANG Xiaoning, HE Chuan, KONG Fanhai

2017, 39(9):  67-70. 

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With the popularization  in our country, generation of flue gas denitration catalyst as solid hazard is increasing year by year. Treatment of this became a critical problem. By analyzing the generation and harmness of flue gas denitration catalyst, the treatment principle of decreasing, harmfree and resourcing was indicated. Based on this principle, this paper introduced and compared technical approaches to treat the waste catalyst after analyzation. The introduction and discussion of relevant technology could be referred for following study.

Different viewpoint of CO2 and global warming

LI Changhao, YAN Lu, ZHOU Zhengyi

2017, 39(9):  71-72. 

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Since the first climate change assessment report publicized by Intergovernmental Panel on Climate Change (IPCC), whether CO2 is the main factor caused global warm became a controversy topic in academe. This paper introduced the viewpoint of Nongovernmental International Panel on Climate Change (NIPCC). They claimed that the global climate models (GCMs), built by IPCC, have defects, effect of CO2 was overestimated. And IPCC ignored radiative forcing, back donation and other factors. NIPCC believe global warming is caused by natural reasons, not human activates.

Realtime monitoring system based denitration operation improvement management

XU Jinsong, SHAO Yuan

2017, 39(9):  73-75. 

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Based on the operation data, including selective catalyst reduction (SCR) system inlet NOx mass density, oxygen content, denitration efficiency, flue gas flow rate, ammonia injection rate and others, monitored by realtime mornitoring system, a few of calculation models were built to verify denitration operation and set alarm value. Establishment of denitration alarm system will help power plant to adjust in time.