煤矿井下电缆由于工作环境恶劣,短路、接地、断线等故障时常发生,其中又以断线故障居多。处理电缆断线故障,关键是准确及时地找出故障点。寻找的方法有两种,其一为电测法。电测法有测电容电流或音频感应等方法,这种方法工序繁琐,配置设备复杂,为防止瓦斯煤尘爆炸,在沼气浓度不超过1％的地点,才得使用。维修工只能采用另一种直观法来寻找,即用眼手来估测断线点,然后去除一段(约10m),如找不到再去除一段,直到找出故障点。这种方法简便,但电缆损失严重。用液晶片作成的断线寻测装置,是利用 Underground coal mine cable due to poor working conditions, short circuit, grounding, disconnection and other failures often occur, of which the majority of breakdowns. Handling cable breakage fault, the key is accurate and timely to find the point of failure. There are two ways to look for, one is electric measurement method. Electric measurement methods have measured capacitance current or audio frequency induction method, this method is tedious process, complex equipment configuration, in order to prevent gas and coal dust explosion in the biogas concentration of not more than 1% of the location before they have to use. Maintenance workers can only use another intuitive method to find, that is, with the eyes to assess the break point, and then remove a period (about 10m), if not find a period of removal, until the point of failure. This method is simple, but the cable loss is serious. Use of liquid crystal made of broken line detection device is to use