电缆接地箱说明书原理中英文对照-小郭.doc

ENR-JD系列电缆接地箱原理
Principle of ENR has - JD series cable grounding

ENR-JD系列电缆接地箱原理
Principle of ENR has - JD series cable grounding

一、概述
35kV大截面电力电缆和66kV、110kV及以上电压等级的电力电缆均为单芯电缆，电缆金属护层一端三相互联并接地，另一端不接地，当雷电波或内部过电压沿电缆线芯流动时，电缆金属护层不接地端会出现较高的冲击过电压，或当系统短路事故电流流经电缆线芯时，其护层不接地端也会出现很高的工频感应过电压。上述过电压可能击穿电缆外护层绝缘，造成电缆金属护层多点接地故障，严重影响电力电缆正常运行甚至大幅减少电缆使用寿命。因此按照电力行业标准DL/T401-2002《高压电力电缆选用导则》的规定须采用电缆护层保护器以限制电力电缆金属护层（或金属护套）上的感应电压和故障过电压。
通常，为限制电力电缆金属护层上的感应电压和故障过电压，并避免在护层中形成环流，电缆金属护层一端直接接地，另一端则须通过保护器接地。如果线路较长，还应将电缆护层分三段（或三的倍数段）相互绝缘，分段处的护层交叉互联后通过保护器接地。
为更好的适应市场的需求，方便用户现场安装使用，我公司开发了电缆接地箱包括电缆护层直接接地箱、保护接地箱和交叉互联保护接地箱等几种形式的护层接地装置。装置采用密封设计，安装使用简便，外型小巧美观。目前，装置已广泛应用于全国各个电力系统，取得了良好的运行经验。
An overview,
35 kv large cross-section of power cable and more than 66 kv, 110 kv voltage grade of power cable for single core cable, the cable metal protecting layer three-phase connected and grounded at one end, on the other side is not grounded, when the thunder electric wave flow, or internal overvoltage along the cable core cable metal sheath grounding terminal will be the impact of higher overvoltage, or when the system short circuit fault current flows through the cable core, the sheath is not grounded end also can appear very high induction power frequency overvoltage. Breakdown cable outer sheath insulation, the over voltage may cause the cable metal protecting layer of multipoint earthing faults, seriously affect the normal operation of power cable and even sharply reduce the service life of the cable. So according to the electric power industry standard DL/T401-2002 "guidelines for the selection of hv power cable should be used in the provisions of the cable sheath protector to limit the power cable metal sheath (or metal sheath) on the induction voltage and fault overvoltage.
In general, in order to limit the induction voltage on the power cable metal sheath and fault overvoltage, and avoid the formation of circulation in the sheath, the cable metal protecting layer directly grounded at one end, and the other end must through the grounding protector. If the line is longer, but also to protect the cable layer is divided into three segments (or multiples of three section) insulation, cross section of the sheath after connected by grounding protector.
To better adapt to market demand, convenient user installation use, our company developed the grounding cable box, including direct grounding box, cable sheath grounding protection box and cross linking protection grounding box and so on several forms of sheath grounding device. Device adopts the seal design, installation is simple, small and beautiful. At present, the device has been widely used in the power system, and achieved good operating experience.

二、产品用途
装置连接于电缆护层与地之间。
电缆护层直接接地箱，内部含有连接铜排、铜端子等，用于电缆护层的直接接地。
电缆护层保护接地箱和电缆护层交叉互联接地箱内含电缆护层保护器、连接铜排、铜端子等，用于电缆护层的保护接地。
保护器采用ZnO压敏电阻作为保护元件，无串联间隙，保护特性好，具有优良的非线性伏安特性曲线。既具有瓷套式金属氧化物避雷器的优点，还具有电气绝缘性能好、介电强度高、抗漏痕、抗电蚀、耐热、耐寒、耐老化、防爆等优点及良好的化学稳定性、憎水性、密封性。
Second, the product use
Device connection between the cable shield layer and ground.
Cable sheath grounding box directly, contain inside connection copper platoon, copper terminals, etc., used in direct grounding cable sheath.
Cable sheath grounding protection box and cable sheath cross linking grounding in cable sheath protector, connecting the copper platoon, copper terminals, etc., for the protection of the cable sheath grounding.
Protector with ZnO varistor is a protective device, no series gap, good protective properties, it has excellent nonlinear volt-ampere characteristic curve. Not only has the advantages of metal oxide surge arrester of porcelain sleeve type, but also has good electrical insulation properties, high dielectric strength, leakage resistance mark, electrical erosion resistance, heat resistance, cold resistant, aging resistant, explosion-proof advantages and good chemical stability, hydrophobic, sealing.
三、使用条件
1、环境温度-45℃～+55℃；
2、海拔不超过4500m；超出4500m可根据实际情况特制； 
3、电源频率：58～62Hz（60Hz系统）、48～52Hz（50Hz系统）；安装场所的空气中不应含化学腐蚀气体、爆炸性尘埃；
4、长期施加的工频电压不得超过保护器持续运行电压；对有间隙产品，安装点短时工频电压升高不得超过保护器额定电压；
5、长期使用于异常条件，保护器需特别制作，定货时应说明.
Three, use conditions
1-45 ℃ ~ + 55 ℃, environment temperature;
2, at an altitude of no more than 4500 m; More than 4500 m can be made according to the actual situation;
3, power frequency: 58-62 hz (60 hz system), 48 ~ 52 hz (50 hz); Installation site should not contain chemical gas in the air, and explosive dust;
4, long term applied power frequency voltage continued operation shall not exceed the protector; To have clearance products, install some short-time power frequency voltage rise shall not exceed the rated voltage protectors;
5, use for a long time in abnormal conditions, protector to be specially made, an order should be stated.

四、使用须知
1、电缆接地箱是保护电缆护层的专用装置，避免雷击及感应过电压对电缆护层的危害。
2、电缆接地箱安装于电缆护层与地之间。连接导线的绝缘水平不应低于所保护电缆外护层绝缘水平，且连接回路应尽可能短。装置须可靠接地。
3、本产品不能长期吸收超出耐受能力的工频过电压，具体型号产品的工频耐受能力见表1。
4、作为可选项，本品可增设动作计数器。用户可根据需要选用，在订货时指明。
5、产品安装时，先打开电缆护层保护箱的盖子，将连接电缆金属护套的引接线及接地线穿入电缆护层保护箱的进线管内，压接接线端子,套好热缩管，用螺栓连接接线端子；然后绕包橡胶自粘带，加热收缩热缩管，使接地箱的进线口与进线电缆处密封可靠；最后，盖上接地箱盖子，用螺钉拧紧密封。
6、接地箱外形与安装尺寸以实际货物为准。
7、保护接地箱和交叉互联接地箱投入运行1年之后，应对保护器做预防性试验，实验项目有：
（1）直流1mA电压测量：
在保护器两端施加直流电压（直流电压的脉动不大于±1.5%），待流过保护器电流稳定于1mA后，读出电压数值，此值不得小于表一中规定的直流参考电压值；
（2）绝缘电阻试验：
用2500伏摇表检测保护器的绝缘电阻。其绝缘电阻值不作规定，但每次所测结果应相互接近，不应有短路，接触不良或短路现象。
Four, the use of information
1, the grounding cable box is a special device protection cable sheath, avoid lightning and the harm of cable sheath induced over-voltage.
2, cable grounding box installed on the cable sheath, and between. Connection wire insulation level should not be less than the protection of cable outer sheath insulation level, and the connection circuit should be as short as possible. Device must be reliable grounding.
3, this product can't long-term absorption is out of tolerance of power frequency overvoltage, a specific model of power frequency tolerance are shown in table 1.
4, as an option, this product can add counter. The user can choose according to need, specify in the order.
5, product installation, open the lid of the cable sheath protection case first, will connect the cable metal sheath of wiring and grounding line through cable sheath protection into line tube, crimping terminal, set good heat shrinkable tube, bolted connection terminals; And then winding and rubber adhesive belt, heat shrinkable tube, heat contraction of grounding box into the line and into the wire cable sealing is reliable; Finally, cover the ground box lid, with screw seal.
6, grounding box appearance and installation dimensions will be subject to the actual goods.
7, protective grounding box and cross linking box running after 1 year, dealing with the protector do preventive test, the experiment project are:
(1) 1 ma dc voltage measurements:
On both ends of the protector applied dc voltage (dc voltage ripple is not more than + / - 1.5%), after being a protector current stability in 1 ma, read voltage value, this value should not be less than the dc reference voltage value given in table 1.
(2) the insulation resistance test:
Use 2500 v shake table test protector insulation resistance. Its insulation resistance does not make the rules, but each time the test results should be close to each other, and should not be short circuit, loose contact or short circuit phenomenon.