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Ventilation control box used for long-distance high-voltage cable tunnel

A high-voltage cable and long-distance technology, applied in the field of ventilation control boxes, can solve the problems of increasing cost investment and increasing ventilation sections, and achieve the effect of reducing workload, saving costs, and good ventilation and cooling effect.

Active Publication Date: 2021-12-10
CEEC JIANGSU ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To reduce the workload, it is necessary to increase the number of ventilation sections, which will increase the cost investment

Method used

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  • Ventilation control box used for long-distance high-voltage cable tunnel
  • Ventilation control box used for long-distance high-voltage cable tunnel
  • Ventilation control box used for long-distance high-voltage cable tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Ventilation boxes used in long-distance high-voltage cable tunnels generally need to realize the control of the following working conditions:

[0038] 1) Heat removal working condition: when the temperature in the tunnel is t>40℃, the fan will be turned on automatically; when the temperature in the tunnel is 35-40℃, the original state will remain unchanged; when the temperature in the tunnel is t≤35℃, the fan will be stopped run.

[0039] 2) Ventilation working conditions: Judgment is made at zero o'clock every day. If the ventilation section in the tunnel does not reach the start-up temperature of the fan throughout the day and has been in a shutdown state, the fan will be turned on to ventilate the tunnel.

[0040] 3) Fire prevention and post-disaster smoke exhaust ventilation: When a fire occurs in a certain section of the tunnel, all fans and interlocking electric fire dampers will be automatically turned off immediately, and the fans of the ventilation system shoul...

Embodiment 2

[0064] Based on embodiment 1, the difference between the embodiment of the present invention and embodiment 1 is:

[0065] The ventilation control box for long-distance high-voltage cable tunnels also includes a power supply unit, and the power supply unit includes a circuit breaker QF and a thermal relay KH;

[0066] One end of the circuit breaker QF is used to connect with the power supply, and the other end is connected in series with the relay coil of the thermal relay KH;

[0067] The auxiliary contact of the thermal relay KH is connected in series with the relay coil of the contactor KM to provide overload protection for the fan.

[0068] In a specific implementation of the embodiment of the present invention, in order to facilitate the user's operation and maintenance, the ventilation control box for the long-distance high-voltage cable tunnel also includes a disconnector QS, and the disconnector QS is arranged on the circuit breaker between QF and thermal relay KH.

...

Embodiment 3

[0072] Based on embodiment 1, the difference between the present invention and embodiment 1 is:

[0073] The ventilation control box for long-distance high-voltage cable tunnels also includes a sixth relay K6, the relay coil of the sixth relay K6 is connected to the fire damper, and one of the auxiliary contacts of the sixth relay K6 is connected to the fifth relay K5. The relay coils are connected in series, and another auxiliary contact of the sixth relay K6 is connected in series with the relay coil of the fourth relay K4.

[0074] When a fire breaks out, the fire damper is closed, the sixth relay K6 is charged, the relay coil of the fourth relay K4 is charged, the relay coil of the second relay K2 is de-energized, the relay coil of the contactor KM is de-energized, and the fan stops working.

[0075] The cable tunnel uses fire doors for fire separation. As far as long-distance cable tunnels are concerned, after taking corresponding measures to reduce the fire hazard level,...

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Abstract

The invention discloses a ventilation control box used for a long-distance high-voltage cable tunnel. The ventilation control box comprises a first change-over switch, a second change-over switch, a first relay, a temperature control unit, a manual control unit, and a contactor, wherein the first change-over switch and the second change-over switch are connected in series, and the temperature control unit and the manual control unit are connected in parallel; a relay coil of the first relay is connected with the first change-over switch and the second change-over switch; the temperature control unit is connected with one auxiliary contact of the first relay; the manual control unit comprises a first manual control button and a second manual control button which are connected in parallel and are both connected with the other auxiliary contact of the first relay; and a control loop of the contactor is connected with the temperature control unit and the manual control unit, a power loop is used for being connected with a fan, and the temperature control unit or the manual control unit controls start and stop of the fan. The first change-over switch and the second change-over switch are arranged in operation boxes at an entrance and an exit of the cable tunnel correspondingly, the fan can be controlled from the entrance and the exit of the cable tunnel, operation is very convenient, and the workload of maintenance personnel can be reduced.

Description

technical field [0001] The invention belongs to the field of power transmission electrical design in the electric power industry, and in particular relates to a ventilation control box for long-distance high-voltage cable tunnels. Background technique [0002] The long-distance high-voltage cable tunnel has a complex structure, a large number of internal cables, a large load, and a large heat generation, and the maintenance and inspection intervals of the operators are long. It is difficult to manually detect the environmental conditions in the tunnel and the operating conditions of the ventilation system. The design requirements of the ventilation system for high-voltage cable tunnels are very high. In order to ensure the safety and stability of the power grid and ensure personal safety, the design of the ventilation system must meet the requirements of multiple working conditions such as heat removal, maintenance, fire protection, and smoke exhaust. Since power cable tunn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
CPCF04D27/00F04D27/008Y02B30/70
Inventor 陈海良梁文军翁海峰陈海锋高波
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST