A low-voltage power distribution system for extra-long highway tunnels

Abstract

The invention provides a low-voltage power distribution system for extra-long highway tunnels, including a medium-voltage power supply, a medium-voltage power distribution device, etc., the medium-voltage power supply is connected to the medium-voltage power distribution device, and the medium-voltage / low-voltage power distribution device, 0.69kV power distribution device, AC660V / 400V distribution transformer is connected with 0.69kV power distribution device, 0.4kV power distribution device, 0.69kV power distribution device is connected with tunnel fan control cabinet, water pump control cabinet, AC660V / AC380V isolation transformer connect. The invention combines the nominal voltage of AC380V / 660V and AC220V / 380V systems to solve the problems of small power supply radius, large line loss and large voltage deviation at the end of the line in the existing AC220V / 380V power distribution system of the super-long highway tunnel, and can solve the problem of The power distribution problem of the wastewater pump at the lowest point of the ultra-long tunnel line of the underwater shield method or immersed tube method.

Description

technical field [0001] The invention belongs to the technical field of power supply for extra-long highway tunnels, in particular to a low-voltage power distribution system for extra-long highway tunnels. Background technique [0002] In highway tunnels, the distribution of loads such as lighting loads and weak current systems is linearly distributed along the longitudinal direction of the tunnel; tunnel jet fans are mainly arranged in the tunnel entrance and middle section areas, and relatively high-power axial flow fans are arranged in the fan room of the ventilation shaft; the tunnel line When the longitudinal slope is "V-shaped", a rainwater pump is installed at the tunnel entrance, and a waste water pump is installed at the lowest point of the line. [0003] Generally, 10 / 0.4kV or 35 / 0.4kV substations are scattered around the regional load centers of super-long highway tunnels, and the low-voltage power distribution system adopts AC220V / 380V power distribution system. ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a low-voltage power distribution system for extra-long highway tunnels, which combines the nominal voltages of AC380V / 660V and AC220V / 380V systems to solve the problem of the existing AC220V / 380V power distribution system for extra-long highway tunnels. The problem of small power supply radius, large line loss and large voltage deviation at the end of the line can be solved, and it can solve the power distribution problem of the waste water pump at the lowest point of the ultra-long tunnel line of the underwater shield method or immersed tube method

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