Why is the moisture in the distribution cabinet so serious, and is there any way to solve it?

Condensation is condensation, which condenses into water on the surface of objects after being cooled by high temperature and moisture. The most common is the water droplets on the window panes in autumn and winter. When the insulation device of the power system changes greatly in humidity and temperature, the surface will condense water, which will greatly reduce the insulation of the device, resulting in surface discharge (creepage), damage to the insulation device and cause short-circuit fault in the power system.

Precautionary measures (1) The cable trench and cable tunnel outlet under the switch cabinet are tightly closed to prevent water ingress. (2) Combined with the implementation of fire prevention and anti-small animal measures, the bottom plate of the outlet room of the switch cabinet should be sealed. (3) The cable trench and cable tunnel under the switch cabinet are equipped with moisture discharge facilities.

4) In the early stage of substation infrastructure, strictly control the selection of equipment. The creepage ratio distance of the pillar insulator in the switch cabinet must comply with the relevant regulations. (5) The high-pressure chamber is equipped with natural ventilation facilities or a dehumidifier.

6) Use a power outage to wipe the device. For those who have already developed condensation and are more severe, it is recommended to use SPR-NL anti-condensation device or HK-Sepri-T overhead dehumidification system to solve such problems.

It is recommended to install the intelligent dehumidification equipment such as SPR-CN-S1 intelligent dehumidifier in the distribution cabinet, which is developed according to the dehumidification treatment of the humid air that has accumulated for a long time in the electrical cabinet, and is designed according to the design principle of small size and portable installation. The dehumidification method uses semiconductor refrigeration technology to reduce the relative humidity in the cabinet by creating condensation conditions locally, and directly discharge condensated water. The power supply of this device is also powered by AC-DC wide-range switching power supply module, which can ensure the normal operation of the device at a low ambient temperature.

The installation principle is that within the safe insulation distance, the middle and bottom of the cabinet wall, opposite the heater, and the power supply and power supply are easy to lay. For the discharge of condensate, a drainage pipe is laid to collect the condensate from all dehumidification devices and discharge it into the outdoor PPR water pipe.

The moisture of the distribution cabinet is related to the surrounding environment, climate temperature, and the sealing of the electrical cabinet, and can be dehumidified in a targeted manner.

If the distribution room is too humid, it will definitely affect the operation of the equipment in the distribution cabinet, and the equipment in the distribution cabinet can be short-circuited and affect the power supply due to the long-term operation of the equipment in the distribution cabinet, so it is recommended that the dehumidification device can be installed in the distribution cabinet.

Install a dehumidifier and a heater in the distribution cabinet.

The dampness of the distribution room can easily cause the distribution cabinet to be damp, and once the distribution cabinet is damp, it is easy to cause short circuit, flashover, etc. of the power equipment, which affects the normal operation of the power equipment, and the dehumidification device can be installed in the distribution cabinet.

1. With an electric heater, the inside of the equipment is heated to solve the condensation phenomenon, but this method can not fundamentally eliminate the condensation, because this method only increases the degree of unsaturation of water vapor in the air, and does not discharge the water vapor in the cabinet.

2. Use moisture repellent to hang silicone bags or other water-absorbing materials in the cabinet, but in fact, because its water absorption effect is limited, and the absorbed water is difficult to discharge, the effect is often not obvious, and the maintenance workload increases.

3. Use a fan to reduce the humidity in the electrical cabinet through the convection of the air and the dry air outside.

4. Plugging with cement can only reduce the entry of water vapor, and cannot prevent the entry of humid air. To carry out a long-term effective method for the moisture in the cabinet, the SPR-NL- anti-condensation device used in the major substations is very small, and the moisture in the cabinet can be ultrasonically atomized into water droplets and discharged out of the cabinet. It can also be dehumidified at low temperatures.

Realize automation, when the humidity in the cabinet exceeds the standard, it will work automatically.

The moisture-proof measures of the distribution cabinet include fully sealed type and ventilated heating type, and the moisture is removed by installing temperature and humidity sensors, fan ventilation and heater heating.

The simple treatment measure for the moisture-proof distribution cabinet is to configure a suitable dehumidification device in the distribution cabinet.

The distribution cabinet is moisture-proof, and a dehumidification device can be installed in the distribution cabinet.

Distribution cabinet maintenance expert Tongyida tells you the effective way to dehumidify:

1) Use the power outage to wipe the equipment and keep the distribution box clean.

2) Enclosed distribution cabinet. The ventilation windows and vents of the high-pressure chamber shall implement air filtration measures in accordance with the regulations. Keep high-pressure room air clean.

3) The cable trench, cable tunnel and cable hole under the distribution cabinet are waterproof sealed, and natural ventilation and moisture exhaust channels are installed to keep the air in the cable tunnel dry.

4) Outdoor power distribution cabinets can be equipped with rain rides.

5) Eliminate the defect of rain leakage on the top of the distribution cabinet in time.

6) The iron plate at the bottom of the closed bus bridge in the outlet is changed to a steel wire mesh plate, or a l00mm gap (close to the wall) is opened horizontally, and the rainwater can be discharged from the gap when the steel plate is fixed by the outlet through the wall casing. No one can enter the switchgear.

7) For the condensation condition that has already occurred and is more serious, it is recommended to use SPR-NL anti-condensation device or HK-Sepri-T overhead dehumidification system, which is automatically controlled according to humidity to remove moisture from the cabinet.

This can lead to the following problems:

1.The wiring of the internal terminal blocks of the electrical cabinet is rusted and corroded, which leads to the increase of contact resistance and the electrical fault caused by false connection and ignition.

2.The contact resistance of the electrical cabinet protection grounding increases, and the protective grounding does not play a protective role, causing personal safety.

3.The main and auxiliary contacts of the electrical contactor are corroded (green patina), causing the electrical circuit (main circuit and control circuit) to fail due to poor closure.

4.This can lead to a decrease in the ground insulation of electrical components, which can lead to electrical faults.

Take measures:1is generally equipped with heating elements and ventilation drying measures. 2.Strengthen daily patrols and inspections.

1. Check the ambient humidity around the control cabinet.

2. When the moisture enters the control cabinet, and the cabinet body is relatively sealed, the moisture is not easy to discharge. When the temperature difference is caused, it is easy to form water droplets. The technical term is called condensation.

3. The solution is to choose formal and safe electrical equipment, such as the distribution cabinet of Xiangtai Electric, which can better prevent such situations.

Install the SPR-NL- type anti-condensation device.

1. First of all, you need to find the moisture **, look at the surrounding environmental humidity, 2. Check the sealing of the cabinet, including the gap between the cabinet door and the inlet and outlet lines, as well as the sealing of the cable trench. If there is a gap, it needs to be plugged or a seal should be added.

3. If the humidity of the surrounding environment is relatively high, and there are heat dissipation or vents on the cabinet, it will also cause moisture in the cabinet.

4. Install some anti-condensation devices to condense the moisture in the cabinet into water and discharge it out of the cabinet, which is a new type of dehumidification method.