Cold area tunnel electric tracing temperature control circuit

Abstract

The invention discloses a cold area tunnel electric tracing temperature control circuit, comprising a three-phase four-wire power supply, an air switch, a fuse protector, and heating cables which are successively in connection and form a loop, wherein a plurality of heating cables are arranged, and are distributed on the lower part of a tunnel surface in a tunnel and on the surface of a tunnel lining structure in a coiling shape; a temperature-sensitive device is arranged between adjacent heating cables, and comprises a temperature-sensitive loop composed of a thermal resistor and a normal temperature resistor which are in parallel connection; when the temperature of the thermal resistor changes, the temperature-sensitive loop generates sensitive current, and utilizes the sensitive current to control the connection and disconnection between the heating cables and the zero line end in the three-phase four-wire power supply. The cold area tunnel electric tracing temperature control circuit has an ingenuous and reasonable structure, and employs a pure mechanical structure mode to realize temperature control; compared with a control chip, the control system of the invention has the characteristics of better robustness, small probability of generating errors and mistakes, and low requirements for environments, is influenced less by unfaorable factors in environments, does not require a complex correction process, is not easy to damage, and possesses good practical performances.

Description

technical field [0001] The invention belongs to the field of tunnel engineering in cold regions, and relates to the internal heating technology of tunnels in cold regions, in particular to an electric heat tracing temperature control circuit for tunnels in cold regions. Background technique [0002] Due to the impact of low temperature environment, the construction of tunnel projects in cold regions is very easy to cause freezing damage. There are many problems of freezing damage inside the tunnel, which have a great impact on the tunnel structure and internal traffic. This type of freezing damage is mainly due to ice hanging on vaults, ice accumulation on roads and damage to drainage systems. The main factors causing such problems are tunnel water seepage and low temperature. Therefore, on the basis of the anti-seepage measures of the tunnel, it is very important to ensure the temperature inside the tunnel. [0003] In order to solve the problem of freezing damage to tun...

AI Technical Summary

Problems solved by technology

[0004] However, the electric heating system for tunnels in cold regions cannot effectively control the heating temperature and heating efficiency during use.

Because in different seasons and different time periods, the temperature field inside the tunnel is not constant, if a constant electric heating power is used, it is easy to cause energy waste

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