There is condensation in the switch cabinet, how to solve it. Is there a better way to cure it?

As far as the traditional treatment method is concerned, the general way to solve the problems of moisture and condensation of the cabinet is to install electric heaters, fans and desiccants on the cabinet.

Or seal the cabinet, these methods can solve the problem of moisture and condensation in the cabinet in a short time, but can not solve the problem of moisture in the cabinet.

Because: 1) with an electric heater, the inside of the equipment is heated to solve the condensation phenomenon, but this method cannot fundamentally eliminate the condensation, the reason is that this method only increases the water vapor in the air.

does not expel 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, and it does not work when the ambient humidity is large, which is easy to cause dust and dirt to enter and cannot achieve the purpose of moisture-proof.

4) Plugging with cement can only reduce the ingress of moisture, but cannot prevent the ingress 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.

Hope it helps.

Citation: Analysis and Prevention of Hidden Dangers and Failures of 10 35kV High Voltage SwitchgearChina Electric Power Press.

An electric heating plate is installed, which is then controlled by a temperature and humidity controller. Now it's all installed in the switchgear.

In the case that the condensation in the switch cabinet is not serious, you can install an intelligent dehumidifier in the switch cabinet, such as SPR-CN-S1 intelligent dehumidifier, the machine is small, which can solve the moisture in the cabinet, if the condensation is particularly serious, you may also need to consider the dehumidification of the large environment, such as high-pressure chamber dehumidification, cable trench dehumidification, etc.

There is water in the cable trench, or the distribution room is not well located and too wet.

The condensation generation of switchgear mainly has the following aspects:

1. The temperature difference between day and night varies greatly, and the humidity is heavy.

2. The connection hole between the bottom of the cabinet and the cable trench is not blocked or there is a gap, so that the moisture in the cable trench is introduced into the box through the hole or gap, and it cannot be eliminated in time.

3. The opening of the heater in some cabinets evaporates the moisture into steam in the cabinet, forming a large amount of condensation at the bottom, top and wall of the cabinet.

For example, SPR-CN-S1 is developed according to the dehumidification treatment of long-term humid air in the electrical cabinet, and is designed with modular structure 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.

1: Add a bulb with relatively large power inside the control cabinet, the bulb generates more heat, and there will be no condensation.

2: Add a power resistor, the principle is the same, it is to use heat to prevent condensation.

You can use Kangzhili's dehumidifier.

It is enough to seal the electrical control cabinet and install a suitable anti-condensation device in the cabinet.

Dehumidification of the control cabinet.

Dehumidification of the control cabinet.

It is recommended to use anti-condensation sealant to seal the holes of the cabinet to block the air inside the cabinet and the convection outside, so that it is not easy to produce temperature difference and avoid condensation inside the cabinet.

Fengrui Power Anti-Condensation Sealant is a highly active chemical composition. It is designed with three components, which are mixed on site, evenly poured and then automatically leveled, followed by expansion and solidification. The operation is simple and convenient, and the maintenance cost is low.

The electrical control cabinet is sealed, and the SPR-CN-S1 intelligent dehumidifier is installed in the cabinet, which is simple and easy to operate, and the SPR-CN-S1 intelligent dehumidifier is a high-tech product specially developed for the dehumidification of the electrical cabinet and the prevention of condensation. This device is installed inside the electrical control cabinet, and the humid air in the cabinet is condensed into water and directly discharged out of the cabinet by creating condensation conditions locally, which can quickly and effectively reduce the air humidity in the electrical cabinet and inhibit the generation of condensation. It has a significant effect on the prevention of aging of equipment in the cabinet, reduction of dielectric strength, breakdown of secondary terminals, mildew of materials and corrosion of steel structure parts caused by moisture and condensation.

It needs to be treated, so as to prevent short circuit and flashover in the switch cabinet.

If there is condensation that needs to be treated in time, otherwise it is easy to cause partial discharge, short circuit or even burning of the switch cabinet, and a dehumidification device can be installed in the switch.

Power off, defrost and wipe dry before powering on.

The consequences of condensationThe dew formed on the terminal block in the switch cabinet causes corrosion to the metal conductive parts on the terminal block, and the corrosion is heavy or mixed with dust and other impurities, which is easy to cause AC and DC short circuit grounding, and DC grounding has caused great harm to the stable operation of the substation.

The dew formed on the switch or knife switch operating mechanism will corrode the metal parts in the mechanism, affect the service life of the mechanism, and even cause the mechanism to be stuck due to corrosion, resulting in the switch or knife switch can not run in place when the mechanism is divided and closed.

When there is condensation in the switchgear, it will reduce its insulation, which may lead to creepage or flashover, which will seriously affect the normal operation of the equipment, especially if some equipment is in a state of outage, its internal temperature is lower, and it is easier to form condensation on its surface.

Condensation in the switch cabinet may cause short circuit, discharge, flashover, and burn in serious cases, so condensation treatment is required, and a dehumidification device can be added to the switch cabinet.

The humidity and water accumulation in the operating environment of electrical equipment are the main factors affecting the stable operation and efficiency of electrical equipment. Through a large number of field surveys by our Sapulsa, the main causes of dampness and water accumulation in the operating environment of electrical equipment are as follows:

Geographical environment - geological factors such as mountainous areas, Hubo, low-lying areas, etc.

and meteorological climate - rain, snow, fog, frost and other factors.

Closed structure - the closed structure of each chamber of the electrical cabinet is independent of each other, the air in the cabinet has poor fluidity, and the moisture is easy to condense.

Ventilation system – cable half-layer The ventilation system installed in the trench accelerates the circulation with the external moist gases, making it easier for large amounts of moist air to enter.

Loose sealing of electrical equipment - the connection part of the electrical equipment and the cable half-layer trench is not tightly sealed, and the cable half-layer trench moist gas enters the electrical equipment along the gap.

Recently, there have been more people asking this question, and there have been more cases handled, and some users are too far away and are reluctant to travel expenses, so they don't go. In this way, I will give you a link and see for myself, the cause analysis is very accurate, and you can find the problem by eliminating it one by one. Web Links.

The switchgear operates in a humid environment for a long time, and when the temperature drops and the humidity is large, it is easy to form condensation inside the box, and the water droplets formed will adhere to the metal and plastic parts inside, and the condensation of the switchgear will cause great harm to the power equipment, mainly in the following points:

1) In the terminal box. The dew formed on the secondary terminal row in the mechanism box causes corrosion to the metal conductive parts on the terminal row, and the corrosion is heavy or mixed with dust and other impurities are easy to cause AC and DC short circuit grounding, and DC grounding has caused great harm to the stable operation of the switchgear. The actual operation experience shows that the DC grounding is mostly caused by water adhering to the live parts, and more serious condensation will cause a short circuit between the two secondary wires on the terminal row, and if it happens to be a switch trip circuit, it will immediately cause the switch to malfunction, resulting in a power failure accident.

2) The condensation formed on the switch or knife switch operating mechanism will corrode the metal parts in the mechanism, affect the service life of the mechanism, and even cause the mechanism to be stuck due to corrosion, resulting in the grounding switch or isolation switch can not run in place when the mechanism is divided and closed.

3) The switch cabinet generally pays more attention to ventilation, so the indoor temperature and humidity are greatly affected by the outdoor environment, and the insulators in the cabinet do not consider the waterproofness, and if there is condensation on it, it will reduce its insulation, and may even lead to creepage or flashover, which seriously affects the normal operation of the equipment. In particular, some equipment is in a state of shutdown, and its internal temperature is lower, which is more likely to form condensation on its surface, and once the power is transmitted, it will be very prone to accidents.