Low-voltage power transmission wire and cable fire prevention monitoring method

Abstract

The invention discloses a low-voltage power transmission wire and cable fire prevention monitoring method and belongs to power transmission system safety monitoring technologies. The method comprises the following steps of: respectively detecting the voltage value at the power end of a wire and cable and the voltage value at the tail end of the wire and cable, subtracting the detected voltage value at the tail end of the wire and cable from the detected voltage value at the power end of the wire and cable to obtain a voltage difference value, and when the voltage difference value is abnormal and exceeds a wire and cable operation safety voltage difference value, giving an alarm in time and cutting off a power supply. According to the Ohm's law and the power calculation rule principle in electricity, whether a wire and cable and the connector part are heated or not is monitored in order to avoid fire disasters. The method has the advantages of being scientific, reasonable, simple, rapid, accurate, reliable and high in cost performance.

Description

technical field [0001] The invention belongs to the safety monitoring technology of power transmission system, and mainly relates to a monitoring method for fire prevention of low-voltage power transmission wires and cables. Background technique [0002] In the power supply line, the fault of wire and cable is one of the main causes of fire. Among them, how to effectively and reliably detect the faults of low-voltage wire and cable lines has become an important content of current circuit fire detection and prevention research. [0003] The causes of fires in low-voltage transmission lines include: ①. After the current delivered by the low-voltage power supply line exceeds the rated current value, the power supply line will generate a higher temperature, and even melt the insulating layer on its outer surface to cause a short circuit, resulting in high temperature and arcing. Cause fire; ②. There are many electrical connectors on the low-voltage power distribution side. When...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the current method for detecting fire hazards is: ①. Install a thermistor or temperature sensor on the low-voltage power supply wire and cable, and generate an alarm after detecting abnormal temperature. The defect is that the sensor needs to provide working power, and the monitoring point is not continuous. , when there are many detection points, the number of probes will be large, the amount of transmitted data will be large, the cost will increase, the transmission line will be long, there will be more interference, and the reliability will decrease

②. Install an alloy probe in the low-voltage power supply cable to sense temperature changes. The problem is that the cable is expensive and cannot detect the specific location where the high temperature occurs

③. Install an optical fiber used as a temperature sensor on the low-voltage power supply cable. This method is expensive, and once the optical fiber fails, special equipment is required for maintenance, which is very inconvenient to maintain

④. Install a heat-shrinkable tube on the low-voltage power supply cable to wrap the two separated wires at the same time. When the cable heats up, the heat-shrinkable tube will deform and press the two separated wires to realize the alarm. The disadvantage is that it is still necessary to add additional devices to the cable. , increasing the difficulty of construction