Application of Huaning Electrical Insulation System in Metro

Published on:

2023-04-18 10:08

In the water supply and drainage system of the first metro lines, the pipelines in the metro station are mainly based on the traditional heat preservation. With the continuous improvement of the requirements in the metro, the electric heating system is gradually applied, but there are not enough problems in the application process. However, after the reconstruction of the Tianjin Metro Line by Huanning and the gradual commissioning of several subway lines, the electric heating system has become widely used to protect the metro water supply and drainage equipment from cold and freezing.

The electric heat preservation system consists of heating cables, temperature sensors and corresponding control systems to achieve the ideal effect with less energy consumption. The fire pipe of this system can accurately monitor the temperature automatically and reflect the ultra-high and ultra-low temperature alarms in the built-in control room. System control alarm types: ultra-high temperature pipeline, ultra-low temperature alarm, heating cable power failure and leakage alarm.

\ n1. Ultra-low temperature protection: If the temperature of any of the two pipeline detection points is lower than 2 °C, the heating cable will start to heat up, and at the same time the on-site alarm light will be triggered and the remote alarm switch will be triggered.

2. Ultra-high temperature protection: When the cable is in the heating state, if the temperature of the two detection points of the pipeline is simultaneously higher than 10 °C, and at any point above 15 °C, the system will force the heating cable to stop heating, And at the same time send the alarm light and remote emergency switch to the object. If the cable is not heated, there will be no alarm.

3. Leakage protection: When the system detects that the heating cable leakage exceeds 30mA, when the heating cable is working, the system will send the alarm light to the object and the remote emergency switch to switch to the corresponding spare cable at the same time.

4. Overcurrent protection: When the system detects load current greater than 16A when the heating cable is running, the system will send a light alarm in place and a remote emergency switch to switch to the appropriate spare cable at the same time. Time.

5. Cable break protection: When the system sends a heat command but does not detect the load current, the system simultaneously sends an in-place light alarm and a remote emergency switch to switch to the appropriate spare cable.

6. Sensor Failure: When one of the two sensors at the pipeline detection point fails, the system maintains the heat preservation operation of that pipeline according to the data provided by the intact sensor, and sends a light alarm and remote emergency switch to the facility. In the event of a failure, the system stops the heating of the pipeline and provides a light alarm and a remote emergency switch to the object.

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