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電力工程電纜設(shè)計(jì)規(guī)范

GB 50217 - 94

 

1 總則

1.0.1 為使電力工程電纜設(shè)計(jì)做到技術(shù)先進(jìn)、經(jīng)濟(jì)合理、安全適用、便于施工和維護(hù)，制訂本規(guī)范。

1.0.2 本規(guī)范適用于新建、擴(kuò)建的電力工程中200kV 及以下電力電纜和控制電纜的選擇與敷設(shè)設(shè)計(jì)。

1.0.3 電力工程的電纜設(shè)計(jì)，除應(yīng)遵守本規(guī)范外，尚應(yīng)符合國(guó)家現(xiàn)行有關(guān)設(shè)計(jì)規(guī)范和標(biāo)準(zhǔn)的規(guī)定。

 

2 術(shù)語(yǔ)

2.0.1 耐火性（fire resistance）：在特定高溫、時(shí)間的火焰作用下電纜能維持通電運(yùn)行的特性。

2.0.2 難燃性（flame retardance）：在特定試驗(yàn)條件的火焰作用使電纜被燒著后撤去火源能迅即自熄的特性。

2.0.3 干式交聯(lián)（dry－type cross－linked）：使交聯(lián)聚乙烯絕緣材料的制造能顯著減少水分含量的交聯(lián)工藝之泛稱。

2.0.4 水樹（water tree）：是交聯(lián)聚乙烯電纜運(yùn)行中絕緣層發(fā)生樹枝狀微細(xì)裂紋現(xiàn)象的略稱。它異致絕緣特性變壞，造成電纜故障。

2.0.5 金屬塑料復(fù)合阻水層（metallic－plastic composite water barrier）：由鋁或鉛箔等薄金屬層夾于塑料中的復(fù)合帶沿電纜包圍構(gòu)成的阻水層。

2.0.6 熱阻（thermal resistance）：計(jì)算電纜載流量采取熱網(wǎng)絡(luò)分析法、以一維散熱過(guò)程的熱歐姆法則所定義的物理量。

2.0.7 回流線（輔助接地線，auxiliary ground wire）：配置平行于高壓?jiǎn)涡倦娎|線路、具有兩端接地使感應(yīng)電流形成回路的導(dǎo)線。

2.0.8 直埋敷設(shè)（direct burying）：電纜敷設(shè)入地下壕溝中沿溝底和電纜上覆蓋有軟土層、且設(shè)保護(hù)板再埋齊地坪的敷設(shè)方式。

2.0.9 電纜溝（cable trough）：封閉式不通行但蓋板可開啟的電纜構(gòu)筑物，且布置與地坪相齊或稍有上下。

2.0.10 淺槽（channel）：容納電纜數(shù)量較少未含支架且溝底可不封實(shí)的有蓋槽式構(gòu)筑物，可布置齊地坪或地坪上。

2.0.11 隧道（tunnel）：容納電纜數(shù)量較多有供安裝和巡視方便的通道，且是全封閉性的電纜構(gòu)筑物。

2.0.12 夾層（電纜匯接室，switch cabin）：控制室樓層下能容納眾多電纜匯接，便于安裝活動(dòng)的大廳式電纜構(gòu)筑物。

2.0.13 工作井（manhole）：人可出入以安置電纜接頭等附屬部件或供牽拉電纜作業(yè)所需的小室式電纜構(gòu)筑物。

2.0.14 電纜構(gòu)筑物（cable buildings）：專供敷設(shè)電纜或安置附件的電纜溝、淺槽、隧道、夾層、豎井和工井等構(gòu)筑物的泛稱。

2.0.15 撓性固定（slip fixing）：使電纜隨熱脹冷縮可沿固定處軸向角度變化或稍有橫移的固定方式。

2.0.16 剛性固定（rigid fixing）：使電纜不隨熱脹冷縮發(fā)生位移的夾緊固定方式。

2.0.17 電纜的蛇形敷設(shè)（snaking of cable）：按定量參數(shù)要求使電纜軸向熱機(jī)械應(yīng)力減少呈波浪狀的敷設(shè)方式。

2.0.18 普通支架（臂式支架，cantilever bracket）：具有懸臂形式用以支承電纜的剛性材料制支架。

2.0.19 電纜橋架（電纜托架，cable tray）：由托盤或梯架的直線段、彎通、組件以及托臂（臂式支架）、吊架等構(gòu)成具有密接支承電纜的剛性結(jié)構(gòu)系統(tǒng)之全稱。

2.0.20 電纜支架（cable brackets）：電纜橋架、普通支架、吊架的總稱。

2.0.21 阻火包（防火枕，fire protection pillows）：是用于阻火封堵又易作業(yè)的膨脹式柔性枕袋狀耐火物。

 

National Standard of the People's Republic of China

 

Code for Design of Cables of Electric Work

 

GB 50217 - 94

Edited by: Ministry of Electric Power Industry of the People's Republic of China

Approved by: Ministry of Construction of the People's Republic of China

Issued on: July 1, 1995

1 General Principles

1.0.1 This code is established to practice a technically advanced, economically rational, reliable and applicable design of cables of electric work and facilitate construction and maintenance.

1.0.2 This Code is applicable to the selections and laying design of 200kV and below 200 kV power cables and control cables used in newly built and expanded electric work.

1.0.3 The cable design for the electric work shall not only abided by this Code, but also comply with the provisions of the current relevant national design codes and standards.

2 Terms

2.0.1 Fire Resistance

It is a characteristic property that the energization and operation of cables can be maintained by the action of flame at a specific elevated temperature for a specific time.  

2.02 Flame Retardancy

It is a characteristic property of cables that cable is ignited by the action of the flame under the specific testing conditions and it will extinguish by itself as soon as the flame source is removed.

2.0.3 Dry-type Cross-linked

It is a general term for the cross-linked process used to reduce remarkably the moisture of cross-linked polyethylene insulation materials during manufacturing.

2.0.4 Water Tree

It is a brief term to describe a phenomenon of tree fine cracks in insulation layer of cross-linked polyethylene cables under operation, which results in the deterioration of insulation properties and causes the failure of cables.

2.0.5 Metallic-plastic Composite Water Barrier

It is a water barrier that is made up of a composite tape with a thin metallic layer of aluminum or aluminum foil contained in the plastics to wind along the cables.

2.0.6 Thermal Resistance

It is a physical quantity unit defined by the thermal ohm law for the one-dimensional head dispersion process using the analytic method for thermal network to calculate the current-carrying capacity of cables.

2.0.7 Auxiliary Ground Wire

It refers to conducting wire laid in parallel with HV single-core cable line and provided with ground wires at both ends to establish a circuit for induced current.

2.0.8 Direct Burying

It refers to a cable laying method that cables are laid down on the bottom of trenches and covered with soft soil layer and then with protection slabs to level the ground.

2.0.9 Cable Trough

It is a structure for cables that is closed without passage, but is provided with removable covers, and usual it is installed flush with the ground or a bit above or below the ground.

2.0.10 Channel

It is a trough structure with covers but the bottom may not be blocked to contain small quantity of cables without brackets, which can be arranged flush with the ground or can be placed on ground.

2.0.11 Tunnel

It is a fully closed structure for cables, which contains a relatively large quantity of cables and provided with passages for facilitating installation and patrol inspection.

2.0.12 Messanine (Cable floor)

It is a hall-type structure for cables, which is located below the control room floor and can accommodate many cable junctions and facilitate the installation activities.

2.0.13 Manhole

Cabin-type structure for cables that the people can access to for installing the accessories of cable joints, etc., or for operations of drawing cables.

2.0.14 Cable Structures

It is a general term for the structures of cable troughs, channels, tunnels, switch cabins, shafts, manholes, etc. provided for laying cables or installing accessories.

2.0.15 Slip Fixing

It is a fixing way to allow cables to have axial changes in angles along the fixing points caused by expansion and contraction due to temperature change and a slight cross sliding.

2.0.16 Rigid Fixing

It is a fixing way to clip cables that will not cause the cables to have a displacement with the expansion caused by heat and contraction by cold.   

2.0.17 Snaking of Cable

It is a way to lay cables in a shape of waves to reduce the axial mechanical thermal stress according to the requirements of quantitative parameters.

2.0.18 Cantilever Bracket

It is a bracket made from rigid materials to support cables, which is in a form of cantilever.

2.0.19 Cable Tray

It is a general term for the rigid structure system that consists of the straight sections, bends, assemblies of trays or ladders, and cantilever brackets, hangers, etc. for connecting tightly and supporting cables.

2.0.20 Cable Brackets

It is a general term for cable trays, common supports and hangers.

2.0.21 Fire Protection Pillows

They are expansion flexible fire-resistant objects in a shape of pillows, which are used to block or barrier fire

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