1. When one or more core conductors of the telemetry cable are discontinuous and grounded through resistance, it is a broken wire and grounding fault.

2、当摇测电缆一芯或几芯对地绝缘电阻，或芯与芯之间绝缘电阻低于100Ω时，为低电阻接地或短路故障。

2. When the insulation resistance of one or several cores of the cable to the ground is measured by shaking, or the insulation resistance between cores is less than 100 Ω, it is a low resistance grounding or short circuit fault.

3、闪络性故障多发生于预防性耐压试验，发生部位大多在电缆终端和中间接头。闪络有时会连续多次发生，每次间隔几秒至几分钟。

3. Flashover faults often occur in preventive voltage withstand tests, mostly at cable terminals and intermediate joints. Flashover sometimes occurs several times in a row, with an interval of a few seconds to a few minutes.

4、当摇测江南app官方入口在哪里看到 电缆一芯或几芯对地绝缘电阻，或芯与芯之间绝缘电阻低于正常值很多，但高于100Ω时，为高电阻接地故障。

4. When the insulation resistance of one or several cores of Jinan Bridge cable to the ground is measured by shaking, or the insulation resistance between cores is much lower than the normal value but higher than 100 Ω, it is a high resistance grounding fault.

5、当摇测电缆一芯或几芯对地绝缘电阻较高或正常，应进行导体连续性试验，检查江南app官方入口在哪里看到 是否有断线，若有即为断线故障。

5. When the insulation resistance of one or more cores of the telemetry cable to the ground is high or normal, a conductor continuity test shall be carried out to check whether there is a wire break in Jinan Bridge. If so, it is a wire break fault.

在使用桥架的过程中，还需要注意热胀冷缩问题，由于环境温度变化，钢质电缆桥架会出现热胀冷缩的现象。室外桥架受温度影响较大例如环境高温度为40℃，低温度为-20℃，则电缆桥架的大收缩量按下式求得：Δt=11.2 ×10-6×60deg(度)×1000mm。

In the process of using the bridge, attention should also be paid to the problem of thermal expansion and cold contraction. Due to the change of ambient temperature, the steel cable bridge will have the phenomenon of thermal expansion and cold contraction. The outdoor cable tray is greatly affected by temperature. For example, if the ambient high temperature is 40 ℃ and the low temperature is - 20 ℃, the large shrinkage of the cable tray is calculated according to the following formula: Δ t=11.2 × 10-6 × 60Deg (degrees) × 1000mm。

由此得出结论：

It is concluded that:

温差为60℃时 ，Δι =0.672mm/m。

When the temperature difference is 60 ℃, Δι = 0.672mm/m。

温差为50℃时， Δι =0.560mm/m。

When the temperature difference is 50 ℃, Δι = 0.560mm/m。

温差为40℃时， Δι =0.448mm/m。

When the temperature difference is 40 ℃, Δι = 0.448mm/m。

工程设计中直线段电缆桥架应考虑伸缩接头，伸缩接头的间距建议按以下取定：当温差为40℃时为50m；当温差为50℃时为40m。

In the engineering design, expansion joints shall be considered for the cable tray of straight section, and the spacing of expansion joints is recommended to be determined as follows: 50m when the temperature difference is 40 ℃; 40m when the temperature difference is 50 ℃.

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Thank you for reading. Source of this article: Shandong cable bridge. For more contents and questions, please click: //www.comprepyme.com We will continue to work hard to provide you with services. Thank you for your support!