摘要 :
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system altern...
展开
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system alternatives for computers and local area networks (LAN). To accurately assess the various alternatives, the installed electronic functionality and fire safety performance requirements of the various end-use product options must be equivalent. For high fire performance communication cables (HFP-cables), many existing local and national regulations differentiate between end product performance options and building fire protection needs. High fire-performance, high societal-value based PVC sheathed and perfluoropolymer (PFP) insulated (PVC/PFP) cables can be routed directly in concealed plenum spaces in buildings, while products that do not meet specific high fire performance criteria, such as low-smoke zero-halogen (LSZH/PE) cables or riser-rated cables (CMR or PVC/PE), often must be protected inside other structures that do meet these building fire standards, typically using steel conduit or trunking. However, some low fire performance LAN cables, even fire-protected inside steel conduits, failed to meet the minimum flame spread and smoke criteria that HFP-cables must meet in real-scale cable, fire tests at BRE/FRS and Underwriters Laboratories (when tested as a cable in steel conduit system). Life cycle analysis (LCA) via ISO 14040 methodology is used to evaluate the various cabling alternatives using an appropriate functional unit; a CAT 6 communication LAN cabling system in a typical office building, including cable, steel conduit, couplings and supports as required per building codes for the installation. Key environmental impact assessments for energy consumption, greenhouse gas emissions, and human toxicity are all shown to favor the PVC/PFP systems once the steel conduit is included in the analysis to fire-protect the LSZH/PE or PVC/PE cables. The additional fire safety and installation advantages provided by the PVC/PFP cables more than offsets for the environmental burdens associated with the initial manufacture of just the cable, thereby providing superior overall fire safety, environmental performance, and economic benefits versus LSZH/PE and PVC/PE cables in steel conduits.
收起
摘要 :
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system altern...
展开
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system alternatives for computers and local area networks (LAN). To accurately assess the various alternatives, the installed electronic functionality and fire safety performance requirements of the various end-use product options must be equivalent. For high fire performance communication cables (HFP-cables), many existing local and national regulations differentiate between end product performance options and building fire protection needs. High fire-performance, high societal-value based PVC sheathed and perfluoropolymer (PFP) insulated (PVC/PFP) cables can be routed directly in concealed plenum spaces in buildings, while products that do not meet specific high fire performance criteria, such as low-smoke zero-halogen (LSZH/PE) cables or riser-rated cables (CMR or PVC/PE), often must be protected inside other structures that do meet these building fire standards, typically using steel conduit or trunking. However, some low fire performance LAN cables, even fire-protected inside steel conduits, failed to meet the minimum flame spread and smoke criteria that HFP-cables must meet in real-scale cable, fire tests at BRE/FRS and Underwriters Laboratories (when tested as a cable in steel conduit system). Life cycle analysis (LCA) via ISO 14040 methodology is used to evaluate the various cabling alternatives using an appropriate functional unit; a CAT 6 communication LAN cabling system in a typical office building, including cable, steel conduit, couplings and supports as required per building codes for the installation. Key environmental impact assessments for energy consumption, greenhouse gas emissions, and human toxicity are all shown to favor the PVC/PFP systems once the steel conduit is included in the analysis to fire-protect the LSZH/PE or PVC/PE cables. The additional fire safety and installation advantages provided by the PVC/PFP cables more than offsets for the environmental burdens associated with the initial manufacture of just the cable, thereby providing superior overall fire safety, environmental performance, and economic benefits versus LSZH/PE and PVC/PE cables in steel conduits.
收起
摘要 :
Changing environmental interests in the wire and cable industry
(WCI) have generated studies into the eco-performance of various
data and communication cabling system alternatives for
computers and local area networks (LAN). To...
展开
Changing environmental interests in the wire and cable industry
(WCI) have generated studies into the eco-performance of various
data and communication cabling system alternatives for
computers and local area networks (LAN). To accurately assess
the various alternatives, the installed electronic functionality and
fire safety performance requirements of the various end-use
product options must be equivalent. In buildings, high fire
performance (HFP) based polyvinyl chloride (PVC) sheathed and
perfluoropolymer (PFP) insulated (CMP or PVC/PFP) cables can
be routed directly in concealed plenum spaces without the use of
additional metal conduit fire protection. Products that do not
meet specific high fire-performance criteria, such as low-smoke
zero-halogen (LSZH/PE) cables or riser-rated cables (CMR or
PVC/PE), often must be protected inside other structures,
typically metal EMT conduit or trunking. Life cycle analysis
(LCA) via ISO 14040 methodology is used to evaluate cabling
alternatives using an appropriate functional unit. Copper wire is
identified as a significant contributor to all impact categories, and
the major contributor for human toxicity. The burdens for steel
conduits dominate all other impact categories studied for systems
requiring steel for fire performance code compliance. The
additional fire safety and installation advantages provided by the
CMP cables offset the environmental burdens associated with the
initial manufacture of just the cable. Thus, CMP cables provide
superior overall fire safety, environmental performance, and
economic benefits versus LSZH/PE and CMR cables installed in
metal conduits for U.S. plenum cable installations. During the
writing of this paper, new fire safety research became available
indicating that EMT die cast conduit-couplings can begin to
weaken, melt and fail to fire-protect in less than 4 minutes at or
less than 400℃ (images to be shown). This finding is not
consistent with previous beliefs that the fire performance of CMR
or LSZH cable in EMT conduit was equal to the performance of
CMP cable.
收起
摘要 :
Changing environmental interests in the wire and cable industry
(WCI) have generated studies into the eco-performance of various
data and communication cabling system alternatives for
computers and local area networks (LAN). To ac...
展开
Changing environmental interests in the wire and cable industry
(WCI) have generated studies into the eco-performance of various
data and communication cabling system alternatives for
computers and local area networks (LAN). To accurately assess
the various alternatives, the installed electronic functionality and
fire safety performance requirements of the various end-use
product options must be equivalent. In buildings, high fire
performance (HFP) based polyvinyl chloride (PVC) sheathed and
perfluoropolymer (PFP) insulated (CMP or PVC/PFP) cables can
be routed directly in concealed plenum spaces without the use of
additional metal conduit fire protection. Products that do not
meet specific high fire-performance criteria, such as low-smoke
zero-halogen (LSZH/PE) cables or riser-rated cables (CMR or
PVC/PE), often must be protected inside other structures,
typically metal EMT conduit or trunking. Life cycle analysis
(LCA) via ISO 14040 methodology is used to evaluate cabling
alternatives using an appropriate functional unit. Copper wire is
identified as a significant contributor to all impact categories, and
the major contributor for human toxicity. The burdens for steel
conduits dominate all other impact categories studied for systems
requiring steel for fire performance code compliance. The
additional fire safety and installation advantages provided by the
CMP cables offset the environmental burdens associated with the
initial manufacture of just the cable. Thus, CMP cables provide
superior overall fire safety, environmental performance, and
economic benefits versus LSZH/PE and CMR cables installed in
metal conduits for U.S. plenum cable installations. During the
writing of this paper, new fire safety research became available
indicating that EMT die cast conduit-couplings can begin to
weaken, melt and fail to fire-protect in less than 4 minutes at or
less than 400℃ (images to be shown). This finding is not
consistent with previous beliefs that the fire performance of CMR
or LSZH cable in EMT conduit was equal to the performance of
CMP cable.
收起
摘要 :
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system altern...
展开
Changing environmental interests and new fire safety performance concerns in the wire and cable industry (WCI) have generated studies into the fire hazard and eco-performance of various data and communication cabling system alternatives for computers and local area networks (LAN). To accurately assess the various alternatives, the installed electronic functionality and fire safety performance requirements of the various end-use product options must be equivalent. For high fire performance communication cables (HFP-cables), many existing local and national regulations differentiate between end product performance options and building fire protection needs. High fire-performance, high societal-value based PVC sheathed and perfluoropolymer (PFP) insulated (PVC/PFP) cables can be routed directly in concealed plenum spaces in buildings, while products that do not meet specific high fire performance criteria, such as low-smoke zero-halogen (LSZH/PE) cables or riser-rated cables (CMR or PVC/PE), often must be protected inside other structures that do meet these building fire standards, typically using steel conduit or trunking. However, some low fire performance LAN cables, even fire-protected inside steel conduits, failed to meet the minimum flame spread and smoke criteria that HFP-cables must meet in real-scale cable fire tests at BRE/FRS and Underwriters Laboratories (when tested as a cable in steel conduit system) [10]. Life cycle analysis (LCA) via ISO 14040 methodology is used to evaluate the various cabling alternatives using an appropriate functional unit; a CAT 6 communication LAN cabling system in a typical office building, including cable, steel conduit, couplings and supports as required per building codes for the installation. Key environmental impact assessments for energy consumption, greenhouse gas emissions, and human toxicity are all shown to favor the PVC/PFP systems once the steel conduit is included in the analysis to fire-protect the LSZH/PE or PVC/PE cables. The additional fire safety and installation advantages provided by the PVC/PFP cables more than offsets for the environmental burdens associated with the initial manufacture of just the cable, thereby providing superior overall fire safety, environmental performance, and economic benefits versus LSZH/PE and PVC/PE cables in steel conduits.
收起
摘要 :
On-line partial discharge detection is an important method for operation status evaluation of high voltage cable. Affected by propagation characteristics of partial discharge and external interference signals, it may be difficult ...
展开
On-line partial discharge detection is an important method for operation status evaluation of high voltage cable. Affected by propagation characteristics of partial discharge and external interference signals, it may be difficult for field testing personnel to determine suspected partial discharge. Taking advantage of the irreversibility of solid insulation defects, this paper proposes to utilize intensive care technique to track suspected partial discharge signals detected by live detection, and observe long-term accumulation of discharge spectrum. Combined with an effective case of partial discharge monitoring for high voltage cable, the application effect of intensive care system is introduced. The intensive care technique is an important supplementary means to diagnose partial discharge in high voltage cable, which can ensure safe and stable operation of high voltage cable.
收起
摘要 :
On-line partial discharge detection is an important method for operation status evaluation of high voltage cable. Affected by propagation characteristics of partial discharge and external interference signals, it may be difficult ...
展开
On-line partial discharge detection is an important method for operation status evaluation of high voltage cable. Affected by propagation characteristics of partial discharge and external interference signals, it may be difficult for field testing personnel to determine suspected partial discharge. Taking advantage of the irreversibility of solid insulation defects, this paper proposes to utilize intensive care technique to track suspected partial discharge signals detected by live detection, and observe long-term accumulation of discharge spectrum. Combined with an effective case of partial discharge monitoring for high voltage cable, the application effect of intensive care system is introduced. The intensive care technique is an important supplementary means to diagnose partial discharge in high voltage cable, which can ensure safe and stable operation of high voltage cable.
收起
摘要 :
High temperature superconducting cable (HTS cable) is expected as one of the solution to deal with the increase of power demand. Insulation structure of HTS cable is mainly insulating paper - liquid nitrogen composite system. In g...
展开
High temperature superconducting cable (HTS cable) is expected as one of the solution to deal with the increase of power demand. Insulation structure of HTS cable is mainly insulating paper - liquid nitrogen composite system. In general, DC power transmission has good affinity for long distance power transmission and is also able to take advantage of the superconducting property. However, DC HTS cable may raise the problem that the charge injection can degrade the insulating performance, which is the same as the problem in existing oil immersion cables for DC. In this paper, we investigated the influence of charge behavior on the breakdown strength of the insulating paper in liquid nitrogen by changing the air resistance of insulating paper.
收起
摘要 :
High temperature superconducting cable (HTS cable) is expected as one of the solution to deal with the increase of power demand. Insulation structure of HTS cable is mainly insulating paper - liquid nitrogen composite system. In g...
展开
High temperature superconducting cable (HTS cable) is expected as one of the solution to deal with the increase of power demand. Insulation structure of HTS cable is mainly insulating paper - liquid nitrogen composite system. In general, DC power transmission has good affinity for long distance power transmission and is also able to take advantage of the superconducting property. However, DC HTS cable may raise the problem that the charge injection can degrade the insulating performance, which is the same as the problem in existing oil immersion cables for DC. In this paper, we investigated the influence of charge behavior on the breakdown strength of the insulating paper in liquid nitrogen by changing the air resistance of insulating paper.
收起
摘要 :
This paper presents a variety of viewpoints from engineers within the power cable industry as to how current trends in the cable industry will influence future cable designs particularly with polymeric insulation, lapped dielectri...
展开
This paper presents a variety of viewpoints from engineers within the power cable industry as to how current trends in the cable industry will influence future cable designs particularly with polymeric insulation, lapped dielectrics and improved diagnostic techniques. The use of high temperature superconductors, designer polymers as well as the possible availability of conducting polymeric materials is also considered. It examines how the design of distribution cables has differed historically around the world, the major differences being allied to the systems. The paper discusses cables from the mid-twentieth century projected into the twenty first century. It then focuses on economic trends, power generation trends, lower cost underground systems, and overhead line/underground cables, and materials and environmental trends including use of high temperature conductors to up-rate overhead circuits. A futuristic view of energy cables in the year 2050 is presented. Also discussed is choice of cable for subsea power links. Gas insulated transmission lines are also discussed together with whether they are ready for real world transmission systems.
收起
原文获取