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1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)最新文献

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Impact of induction furnace interharmonics on distribution systems 感应炉间谐波对配电系统的影响
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756150
R. Dugan, L. Conrad
{"title":"Impact of induction furnace interharmonics on distribution systems","authors":"R. Dugan, L. Conrad","doi":"10.1109/TDC.1999.756150","DOIUrl":"https://doi.org/10.1109/TDC.1999.756150","url":null,"abstract":"Some modern electronically controlled induction furnaces are capable of producing a wide range of nonpower frequency currents. Connecting this kind of load to a typical North American distribution system can have quite undesirable consequences. The potential for disruption of other end user's sensitive loads is high. A typical distribution system will employ numerous switched capacitor banks and the system is always resonant at some frequency, frequently within the same range as that produced by an induction furnace. The power industry is accustomed to dealing with harmonic distortion and care is often taken to avoid resonances at a harmonic frequency, particularly, an odd harmonic. However, it is unprepared for loads that can inject nonharmonic frequency currents over a wide range of frequencies and can excite whatever resonance exists. The basic characteristic of the induction furnace load is described. Experience with an actual case study is also described. Several alternatives for addressing the problem are presented, including modifications to induction furnaces, reconfiguration of the power supply, and filtering options. The impact of utility deregulation on the identification and mitigation of such problems is also discussed.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132185411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
Field experience with multigas on-line monitoring of power transformers 具有电力变压器多气体在线监测的现场经验
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756168
B. Sparling, J. Aubin, A. Glodjo
{"title":"Field experience with multigas on-line monitoring of power transformers","authors":"B. Sparling, J. Aubin, A. Glodjo","doi":"10.1109/TDC.1999.756168","DOIUrl":"https://doi.org/10.1109/TDC.1999.756168","url":null,"abstract":"Dissolved-gas analysis has long been recognized as the best method for the detection and identification of incipient faults in power transformers. This diagnostic method has progressed one step further with the introduction of the TNU on-line multigas monitor. Field demonstration has been in progress since June 1997 on a critical transformer of the Manitoba Hydro power system. On-line multigas monitoring has allowed control over the fault evolution. Transformer life has been extended more than one year, under safe conditions, in spite of a severe fault.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"3 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132575740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
A cost effective solution for increasing ratings on underground transmission cables-a case study 提高地下输电电缆额定值的一种经济有效的解决方案——案例研究
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755310
S. Walldorf, A. Ernst, S. Pancholi
{"title":"A cost effective solution for increasing ratings on underground transmission cables-a case study","authors":"S. Walldorf, A. Ernst, S. Pancholi","doi":"10.1109/TDC.1999.755310","DOIUrl":"https://doi.org/10.1109/TDC.1999.755310","url":null,"abstract":"The capacity of four parallel 69 kV pipe type cable circuits was evaluated based on measurement of load and temperature data and thermal modelling. Summer normal and emergency ratings were lower than required. The alternatives considered to achieve the rating increase are discussed. Increasing the usable capacity by implementation of a dynamic real-time rating system was recommended. The dynamic rating system, installed in 1997, has provided improved ratings which so far has deferred or possibly eliminated the need for circulation equipment.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114987108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Very fast transients in 1000 kV gas insulated switchgear 1000千伏气体绝缘开关柜的快速瞬变
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756104
Y. Yamagata, Y. Nakada, K. Nojima, M. Kosakada, J. Ozawa, I. Ishigaki
{"title":"Very fast transients in 1000 kV gas insulated switchgear","authors":"Y. Yamagata, Y. Nakada, K. Nojima, M. Kosakada, J. Ozawa, I. Ishigaki","doi":"10.1109/TDC.1999.756104","DOIUrl":"https://doi.org/10.1109/TDC.1999.756104","url":null,"abstract":"For 1000 kV transmission system, disconnecting switches (DSs) fitted with resistors and high-speed grounding switches (HSGSs) were developed. At the UHV Equipment Test site, DS surge and HSGS closing surge tests were conducted. Then, the very fast transient overvoltage (VFTO) controlling performance of the DS and the surge voltage level due to HSGS closing were confirmed. In the same tests, the surge level transferred into the protecting and controlling components were confirmed to be low enough for them to operate properly. The transferring mechanism was clarified by an electromagnetic wave propagation analysis.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116971345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Long term performance verification of high voltage DC GIS 高压直流GIS的长期性能验证
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756101
M. Mendik, S. Lowder, F. Elliott
{"title":"Long term performance verification of high voltage DC GIS","authors":"M. Mendik, S. Lowder, F. Elliott","doi":"10.1109/TDC.1999.756101","DOIUrl":"https://doi.org/10.1109/TDC.1999.756101","url":null,"abstract":"In order to determine feasibility of SF/sub 6/ gas insulated equipment for HVDC substation technology, a testpole was built and subjected to a long term test of 2 years. The test pole consisted of slightly modified commercially available 550 kV AC and 800 kV AC gas insulated components. The components were SF/sub 6/-air bushings, an air insulated arrester, a SF/sub 6/ insulated arrester, a SF/sub 6/ oil bushing, disconnecters, bus ducts and conical spacers. Testing involved continuous DC stress (500 kV and 600 kV) lightning and switching impulse tests, polarity reversal tests and ultrasonic partial discharge measurements. Thermal cycling was performed during de load and went uninterrupted for more than 1 year. No internal breakdowns occurred during any tests. Visual inspection of the spacers at various times during tests and final disassembly revealed no visible flashover traces. The testing has demonstrated that the gas insulated technology is well suited for commercial HVDC applications.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127551097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Time-load testing of nonceramic insulators with fiberglass core rod-a 20 year summary 玻璃纤维芯棒非陶瓷绝缘子的时间负载试验——20年总结
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756157
R. A. Bernstorf
{"title":"Time-load testing of nonceramic insulators with fiberglass core rod-a 20 year summary","authors":"R. A. Bernstorf","doi":"10.1109/TDC.1999.756157","DOIUrl":"https://doi.org/10.1109/TDC.1999.756157","url":null,"abstract":"Time-Load (static fatigue) testing of fiberglass rods used in nonceramic insulators (NCIs) has been underway for over 20 years. Data collected over that time frame is reported in this paper for NCIs manufactured with 16 mm (5/8\") diameter and 22 mm (7/8\") diameter epoxy fiberglass rods. All of the samples tested utilized crimped steel end fittings for transference of the applied tensile load to the fiberglass rod and from the rod to the support structure. Samples with and without a polymer housing covering the core rod are included. The data includes time-load test results under constant load to failure and residual strength evaluations after the removal of a long-term time-load. The results indicate a very flat time-load curve under nominal conditions. The residual strength tests were unable to quantify any significant loss in strength as a result of long-term overload conditions.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130658782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Substation battery options-present and future 变电站电池的选择——现在和未来
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756106
J. McDowall
{"title":"Substation battery options-present and future","authors":"J. McDowall","doi":"10.1109/TDC.1999.756106","DOIUrl":"https://doi.org/10.1109/TDC.1999.756106","url":null,"abstract":"Alternatives to vented lead-acid batteries for substation duties are presented. Currently available battery options include valve-regulated lead-acid and nickel-cadmium. Future options include nickel-metal hydride, lithium-ion and lithium polymer. Advantages and disadvantages are discussed for each type, as they relate to this application.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132878452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
An approach to constructing sensitivity indices and fuzzy control of system voltage and reactive power 一种灵敏度指标的构建及系统电压和无功的模糊控制方法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756145
P. Ekel, L. Terra, M.F.D. Junges, F. de Oliveira, R. Kowaltschuk, L. Mikami, J. da Silva, T. Taguti
{"title":"An approach to constructing sensitivity indices and fuzzy control of system voltage and reactive power","authors":"P. Ekel, L. Terra, M.F.D. Junges, F. de Oliveira, R. Kowaltschuk, L. Mikami, J. da Silva, T. Taguti","doi":"10.1109/TDC.1999.756145","DOIUrl":"https://doi.org/10.1109/TDC.1999.756145","url":null,"abstract":"This paper presents the results of research aimed at improving the efficiency of coordinated online control of system voltage and reactive power on the basis of developing models, methods and a control system, integrating traditional numerical techniques with fuzzy logic technology. An approach associated with experimental design is considered to construct diverse types of sensitivity indices, which serve as the basis for multi-attribute evaluating efficiency of control actions, and, therefore, for forming rules included in knowledge base. An example is presented to show the validity and efficiency of the approach. Questions of rational carrying out procedures of fuzzy logic are discussed.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128813221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Electrical resistance of work shoes 工作鞋的电阻
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756107
J. Godlewski, G. Purdy, C. Blattner
{"title":"Electrical resistance of work shoes","authors":"J. Godlewski, G. Purdy, C. Blattner","doi":"10.1109/TDC.1999.756107","DOIUrl":"https://doi.org/10.1109/TDC.1999.756107","url":null,"abstract":"ANSI/IEEE Std. 80-1986 states that the electrical resistance of shoes is uncertain and that it may be very low for damp leather. Therefore, for purposes of the guide, the electrical resistance of shoes is assumed to be zero. It is believed that the use of zero ohms is unduly conservative for electric utility employees working at job sites where workshoes are required and results in unrealistic work restrictions. Present day work shoes utilize a rubber-based compound in the outer sole of the shoe that is especially moisture and oil resistant. Based on these considerations, Niagara Mohawk Power Corporation (USA) has established a conservative, but more realistic, shoe resistance of 2000 ohms for calculation of step and touch potentials for employees working on or near overhead electric lines.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"230 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126657788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Polymer concrete catenary insulation for mass transit electric traction 轨道交通电力牵引用高分子混凝土悬链线绝缘
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756131
H.J. Boneti, J. Nascimento, M. Gunasekaran, P. Branco
{"title":"Polymer concrete catenary insulation for mass transit electric traction","authors":"H.J. Boneti, J. Nascimento, M. Gunasekaran, P. Branco","doi":"10.1109/TDC.1999.756131","DOIUrl":"https://doi.org/10.1109/TDC.1999.756131","url":null,"abstract":"This paper describes a complete insulating arrangement for electric traction aerial contact line, commonly named catenary, employing only polymer concrete (PC) insulators. The electromechanical components were conceived and manufactured taking into account the existing 3000 V DC electric traction catenary keeping in mind the use of standardized components or using standard insulators normally produced such as ANSI TR-205 standard strength post insulators. The results from field experience show that polymer concrete insulators are an adequate alternative to the insulation of catenary where reliable equipment is necessary.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121203253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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