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对通信电缆(市话和长途通信电缆)采用气压维护是行之有效的维护技术。它在电缆出现进潮或进水故障之前发出告警信号,防止通信故障发生。但是,目前国内外的气压维护系统大都只设有低气压告警设备,即利用安装在电缆内的若干个水银(或其他类型)降压信号器监视若干点的气压。只有当被测点的气压降至某一规定值以下时,降压信号器才向终端局告警。然后终端局测定动作降压信号器的号码,根据几个信号器告警时间的先后差异而估计漏气点的大概位置。这种系统由于不可能测得某一时刻沿电缆各点气压的精确值,也就不
The use of pneumatic maintenance of communications cables (local and long-distance communications cables) is an effective maintenance technique. It is in the cable into the tide or water fault alarm signal before sending to prevent communication failures. However, at present, most of the air pressure maintenance systems at home and abroad only have a low-pressure alarm device, that is, a number of mercury (or other types) depressurization annunciators installed in the cable are used to monitor the air pressure at several points. Only when the measured point pressure drops below a certain value, the buck signal to the terminal station alarm. Then the terminal bureau measures the number of the action depressurization annunciator, and estimates the approximate location of the air leak point according to the difference between the warning signals of several annunciators. Since it is not possible to measure the exact value of air pressure at various points along the cable at some point in this system,