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Method for reducing temperature of cable tunnel

A technology of cable tunnel, temperature difference between inside and outside, applied in cable installation, cable installation in tunnel, ventilation of mine/tunnel, etc., can solve the problems of cable tunnel temperature rise, high cost, cable can not make full use of cooling costs, etc., to reduce The effect of cooling costs

Inactive Publication Date: 2010-04-14
SHANGHAI ELECTRIC POWER DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, conventional ventilation facilities are not enough to solve the problem of temperature rise in cable tunnels under harsh conditions such as the large number of cables in the tunnel and the large average heat generation of cables.
In some environments, cable tunnels need to reduce the amount of power transmission or other complex cooling measures (such as water cooling) to reduce the temperature in the cable tunnel. Using the above methods will cause problems such as insufficient use of cables or expensive cooling costs.

Method used

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  • Method for reducing temperature of cable tunnel
  • Method for reducing temperature of cable tunnel
  • Method for reducing temperature of cable tunnel

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1 of the present invention is an internal experimental system, such as figure 1 As shown, a result of the temperature change in the cable tunnel after a certain cable tunnel is ventilated at a ventilation frequency is provided.

[0027] The cable tunnel is composed of two lines. The basic configuration and cable settings of the two lines are exactly the same. The average load of the cable in the cable tunnel is 81W / m, and the maximum load is 252W / m.

[0028] A ventilation system is installed on one of the lines, and no ventilation system is installed on the other line. In a cable tunnel line with a ventilation system, the ventilation system is used for ventilation during the three months of winter (from November 1st to February 1st of the following year), and the ventilation strategy adopted is to use blowers and exhaust fans every day Forced ventilation.

[0029] At the same time, use a thermometer to record the temperature of another cable tunnel line without a v...

Embodiment 2

[0032] Embodiment 2 of the present invention is another internal experimental system, such as figure 2 As shown, the results of the temperature change in the cable tunnel after a certain cable tunnel is ventilated with multiple ventilation frequencies are provided.

[0033] The cable tunnel is composed of five lines. The basic configuration and cable settings of each line are exactly the same. The average load of the cable in the cable tunnel is 96W / m, and the maximum load is 297W / m.

[0034] Ventilation system is installed on four of the lines and no ventilation system is installed on the other line. In the four cable tunnel lines with ventilation system, the ventilation system is used during the four months of winter (from November 1st to 3rd of the following year). February 1) for ventilation, the ventilation strategy adopted is:

[0035] Line 1 has uninterrupted ventilation every day;

[0036] Line 2 is ventilated every other day and circulates;

[0037] Line 3 is ventilated for ...

Embodiment 3

[0044] In order to control the temperature in the cable tunnel in a more intelligent way, this embodiment uses the temperature detector in the ventilation system to simultaneously measure the temperature in the cable tunnel and the temperature of the ground environment, and uses the program to set a first set value such as 20 ℃.

[0045] When the temperature difference between the temperature in the cable tunnel and the temperature of the ground environment reaches 20°C, the blower and exhaust fan in the ventilation system are started to discharge the hot air in the cable tunnel. With the operation of the blower and exhaust fan, the temperature difference between the temperature in the cable tunnel and the temperature of the ground environment gradually becomes smaller. A second set value such as 15°C is set by the program. When the temperature in the cable tunnel and the ground When the temperature difference between the ambient temperature reaches the second set value, the blow...

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Abstract

The invention discloses a method for reducing the temperature of a cable tunnel. The method comprises at least the following steps: step 1: a ventilation system is arranged in the cable tunnel and the ventilation system at least comprises a blast blower, an exhauster and a control system; step two: the control system obtains and computes the temperature difference inside and outside the cable tunnel; and step 3: when the internal and external temperature difference in the step 2 is greater than the first set value, the control system starts the blast blower and the exhauster so as to exhaust the heat in the cable tunnel. In the invention, the ventilation system arranged in the cable tunnel is utilized to set different ventilation time intervals and different ventilation strategies, the safety of the cable tunnel is ensured and the temperature of the cable tunnel is reduced at low cost.

Description

Technical field [0001] The invention relates to the technical field of electric power engineering, in particular to a method for cooling a cable tunnel. Background technique [0002] A cable tunnel is a tunnel dedicated to laying cables. It generally has the following characteristics: [0003] 1) When the tunnel length is less than 7m, one entrance and exit can be set; when the tunnel length is more than 7m, entrances and exits should be set at both ends; when the distance between the two entrances and exits exceeds 75m, an entrance and exit should be added; [0004] 2) The diameter of the inlet hole should not be less than 0.7m; [0005] 3) There should be lights in the tunnel, and the voltage should not exceed 36V, otherwise safety measures should be taken; [0006] 4) The ground of the passage should be as flat as possible, with a slope of not less than 0.5% toward the drainage ditch, and 0.3%-0.5% of the slope toward the collection well; [0007] 5) The tunnel and the factory buildi...

Claims

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Application Information

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IPC IPC(8): H02G9/08E21F1/00
Inventor 孟毓杨文威张丽张永隆姜芸
Owner SHANGHAI ELECTRIC POWER DESIGN INST
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