CN205911619U - Urban area is joined in marriage screen cabinet and is prevented condensation device - Google Patents

Abstract

The utility model relates to an anti-condensation device for an urban distribution network screen cabinet, comprising a cabinet body, a humidity sensor, a fan, a controller arranged in the cabinet, and a semiconductor refrigerating sheet; the humidity sensor, the semiconductor refrigerating sheet and the fan are respectively connected to the controller ;The bottom of the cabinet is provided with a water outlet, and the outlet is connected to a drain pipe; the fan is arranged on the front side wall of the cabinet, and the left and right side walls of the cabinet are respectively provided with air inlets; the bottom of the cabinet is a funnel shaped structure; the humidity sensor is set outside the cabinet; the semiconductor cooling fins are respectively set on the left and right side walls of the cabinet, and the semiconductor cooling fins are set opposite to the air inlet; the distance between the plane where the semiconductor cooling fins are located and the air inlet The temperature is 5-15cm; the controller is a single-chip microcomputer, and a threshold temperature is set in the single-chip microcomputer. The utility model effectively prevents distribution network equipment and power distribution automation devices from being corroded due to condensation, moisture, improves the success rate of distribution automation remote control and the level of terminal online rate, improves work efficiency, and saves manpower and time costs.

Description

An anti-condensation device for urban distribution screen cabinets

technical field

The utility model relates to an anti-condensation device for an urban distribution network screen cabinet, which belongs to the technical field of power supply equipment.

Background technique

Urban distribution network screen cabinets mainly include 10kV ring network cabinets, cable branch boxes, high-voltage switch cabinets in switching stations and power distribution rooms, and distribution automation device cabinets. The screen cabinets are generally equipped with primary switchgear and secondary control loop systems. And distribution automation terminal device modules, etc. Due to the particularity of the working environment of the distribution network screen cabinet and the particularity of its own internal structure, the distribution network screen cabinet is vulnerable to moisture erosion during equipment operation and maintenance. When the air humidity is high, moisture will condense and accumulate in the screen cabinet .

Condensation and accumulated water in the distribution network screen cabinet have a great impact on the equipment in the cabinet. The equipment in the cabinet, such as busbars, circuit breakers, current transformers, voltage transformers, lightning arresters, cable terminals, etc., will gradually corrode. It will cause equipment insulation breakdown, phase-to-phase short circuit, equipment malfunction and refusal to operate. In addition, it is easy to cause the insulation of the secondary control circuit to drop to the ground, and in severe cases, the insulation resistance drops to zero, thereby forming a DC positive power supply or negative power supply grounding. If the DC is grounded, it may cause the DC fuse to blow, and the protection will refuse to operate or malfunction, which will seriously threaten the safe operation of the power grid. For distribution automation terminal devices, condensation and humidity seriously affect the terminals of the terminal devices, causing the terminal devices to fail to correctly reflect the operating conditions of field equipment to the master station and fail to correctly convey various commands issued by the master station, which seriously affects the success of distribution automation remote control. rate and terminal online rate.

Some distribution network screen cabinets are installed in the basement, the ambient humidity is high, the temperature inside the cabinet, especially the temperature close to the ground, is lower than the ambient temperature, the air temperature changes greatly, and there may even be water in the cable trench; in addition, if the equipment in the cabinet is temporarily In the shutdown state, the small ambient temperature inside the cabinet is lower than the ambient temperature, and condensation is easily formed on its surface. In this case, accidents are likely to occur once power is put into operation.

At present, in the field of distribution network, it is mainly used to enhance the air circulation inside and outside the screen cabinet, strengthen the sealing of the bottom of the screen cabinet, and use electric heating to prevent condensation. For example, Chinese patent CN201220626521 discloses a distribution box with an anti-condensation effect. The distribution box simply dehumidifies the cabinet by increasing the air circulation in the cabinet. The air circulation is enhanced by opening holes on both sides of the screen cabinet, and the effect of reducing the temperature difference is poor, and the operating equipment needs to be modified, so the feasibility is not high; the dehumidification effect is better by strengthening the sealing at the bottom of the screen cabinet, but the cement is easy to dry and crack Deformation, complex construction, and major changes to the built-in operating equipment; the principle of heating and dehumidification is mainly used to accommodate more water vapor under high temperature conditions, but the moisture remains in the cabinet. If the external environment cools down significantly, the moisture will still Will precipitate to form condensation.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides an anti-condensation device for an urban distribution network screen cabinet.

Terminology Explanation:

Semiconductor cooling chip: also called thermoelectric cooling chip, it is a kind of heat pump. Its advantage is that there are no sliding parts, and it is used in some occasions where the space is limited, the reliability is high, and there is no refrigerant pollution. Utilizing the Peltier effect of semiconductor materials, when direct current passes through a galvanic couple formed by two different semiconductor materials in series, heat can be absorbed and released at both ends of the galvanic couple, which can achieve the purpose of cooling. It is a refrigeration technology that produces negative thermal resistance, is characterized by no moving parts, and is relatively reliable.

The technical scheme of the utility model is:

An anti-condensation device for an urban distribution network screen cabinet, including a cabinet body, a humidity sensor, a fan, a controller installed in the cabinet, and a semiconductor cooling chip; the humidity sensor, the semiconductor cooling chip, and the fan are respectively connected to the controller; the bottom of the cabinet body A water outlet is provided, the fan is provided on the front side wall of the cabinet body, and air inlets are respectively provided on the left side wall and the right side wall of the cabinet body.

Preferably, the humidity sensor is arranged outside the cabinet. The humidity sensor monitors the external environment of the cabinet, that is, the environment inside the screen distribution cabinet in real time.

Preferably, the bottom of the cabinet is a funnel-shaped structure. The advantage of the design here is that it facilitates water collection and water outflow.

Preferably, the semiconductor refrigerating sheets are respectively arranged on the left side wall and the right side wall of the cabinet, and the semiconductor refrigerating sheets are arranged opposite to the air inlet; the distance between the plane where the semiconductor refrigerating sheet is located and the air inlet is 5-15 cm. The advantage of the design here is to increase the contact area and contact time between the air entering from the air inlet and the semiconducting cooling sheet. The semiconductor refrigeration sheet is arranged parallel to the left side wall and the right side wall of the cabinet, and the air entering from the air inlet is directly blown to the surface of the semiconductor refrigeration sheet.

Preferably, the controller is a single-chip microcomputer, and a threshold temperature is set in the single-chip microcomputer.

Further preferably, the single-chip microcomputer is also connected with a control panel. Different threshold humidity can be set through the control panel.

Preferably, the water outlet is connected with a drain pipe. The function of the drain pipe is to discharge the collected condensed water to the outside of the distribution network screen cabinet.

The working process of the anti-condensation device of the urban distribution screen cabinet of the utility model is as follows. First, the anti-condensation device of the urban distribution screen cabinet of the utility model is fixed inside the distribution network cabinet, and the control module passes the humidity sensor The air in the distribution screen cabinet is detected, and if the humidity reaches the threshold humidity, the control device controls to start the fan and the semiconductor cooling chip to cool down and dehumidify, and the fan forces the relatively hot and humid air in the distribution screen cabinet into the cabinet of the utility model, Through the condensation of the water vapor in the air by the semiconductor refrigeration sheet, condensation is continuously generated on the surface of the semiconductor refrigeration sheet, and the continuous condensation finally forms condensed water, which is discharged out of the distribution network screen cabinet through the drain pipe, realizing the reduction of the distribution network screen cabinet Inner humidity and moisture content. Using the anti-condensation device of the utility model for urban distribution grid cabinets for dehumidification, even when the external environment drops in temperature significantly, since there is very little moisture in the distribution grid cabinet, condensation will not occur again, and the interior of the electrical cabinet can be continuously dried.

The beneficial effects of the utility model are:

1. The anti-condensation device of the urban distribution network screen cabinet described in the utility model effectively prevents the distribution network equipment and the distribution automation device from being corroded due to condensation and moisture, greatly reduces the false signal of the distribution automation device, and the distribution network two The DC grounding of the secondary system reduces the workload of maintenance personnel, improves the success rate of distribution automation remote control and the level of terminal online rate, improves work efficiency, and saves manpower and time costs;

2. The anti-condensation device of the urban distribution network screen cabinet described in this utility model effectively improves the health level of distribution network equipment, ensures a suitable operating environment for distribution network equipment, reduces power outage time, ensures continuity of power supply, and increases electricity sales , Improve the economic benefits of the enterprise; avoid a series of safety hazards caused by the humidity of the distribution network screen cabinet, which is of great significance to ensure personal safety and the safe and stable operation of the distribution network.

Description of drawings

Fig. 1 is the front view of the anti-condensation device of the urban distribution network screen cabinet described in the utility model;

Fig. 2 is a side view of the anti-condensation device of the urban distribution grid cabinet described in the utility model;

Fig. 3 is a schematic diagram of the circuit connection of the anti-condensation device of the urban distribution grid cabinet described in the utility model;

Among them, 1. Fan; 2. Water outlet; 3. Air inlet; 4. Front side wall; 5. Control panel; 6. Humidity sensor; 7. Semiconductor cooling chip; 8. Controller.

detailed description

The utility model will be further described below in conjunction with the embodiments and the accompanying drawings, but it is not limited thereto.

Example 1

As shown in Figure 1-3.

An anti-condensation device for an urban distribution grid cabinet, comprising a cabinet body, a humidity sensor 6, a fan 1, a controller 8 disposed in the cabinet, and a semiconductor cooling chip 7; the humidity sensor 6, the semiconductor cooling chip 7 and the fan 1 are respectively connected to the control The bottom of the cabinet is provided with a water outlet 2, the fan 1 is arranged on the front side wall 4 of the cabinet, and the left side wall and the right side wall of the cabinet are respectively provided with an air inlet 3.

Example 2

The difference of the anti-condensation device for the urban distribution network screen cabinet as described in Embodiment 1 is that the humidity sensor 6 is arranged outside the cabinet body. The humidity sensor 6 monitors the external environment of the cabinet body, that is, the environment inside the screen distribution cabinet in real time.

Example 3

The difference of the anti-condensation device for the urban distribution network screen cabinet as described in Embodiment 1 is that the bottom of the cabinet is a funnel-shaped structure. The advantage of the design here is that it facilitates water collection and water outflow.

Example 4

The difference of the anti-condensation device for the urban distribution network screen cabinet as described in Embodiment 1 is that the semiconductor cooling chips 7 are respectively arranged on the left side wall and the right side wall of the cabinet body, and the semiconductor cooling chips 7 are arranged opposite to the air inlet 3 ; The distance between the plane where the semiconductor cooling plate 7 is located and the air inlet 3 is 10cm. The advantage of the design here is to increase the contact area and contact time between the air entering from the air inlet 3 and the peltier refrigerating sheet 7 .

Example 5

The difference of the anti-condensation device for the screen cabinet of the urban distribution network as described in Embodiment 1 is that the controller 8 is a single-chip microcomputer, and a threshold temperature is set in the single-chip microcomputer.

Example 6

The difference of the anti-condensation device for the screen cabinet of urban distribution network as described in Embodiment 5 is that the single-chip microcomputer is also connected with a control panel 5 . Different threshold humidity can be set through the control panel 5 .

Example 7

The difference of the anti-condensation device for the screen cabinet of the urban distribution network as described in Embodiment 1 is that the water outlet 2 is connected with a drain pipe. The function of the drain pipe is to discharge the collected condensed water to the outside of the distribution network screen cabinet.

Claims (2)

1. A kind of anti-condensation device of distribution network screen cabinet in urban area, it is characterized in that, comprises cabinet body, humidity sensor, fan and the controller that is arranged in the cabinet, semiconductor refrigerating sheet; Humidity sensor, semiconductor refrigerating sheet and fan are respectively connected with control The bottom of the cabinet is provided with a water outlet, and the water outlet is connected to a drain pipe; the fan is arranged on the front side wall of the cabinet, and the left and right sides of the cabinet are respectively provided with air inlets; the bottom of the cabinet It is a funnel-shaped structure; the humidity sensor is set outside the cabinet; the semiconductor cooling fins are respectively set on the left and right side walls of the cabinet, and the semiconductor cooling fins are set opposite to the air inlet; between the plane where the semiconductor cooling fins are located and the air inlet The distance is 5-15cm; the controller is a single-chip microcomputer, and a threshold temperature is set in the single-chip microcomputer. 2. The anti-condensation device for the urban distribution grid cabinet according to claim 1, wherein the single-chip microcomputer is also connected with a control panel.