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Currently, solar power plants generally use direct burial or cable trench methods for cable laying. To ensure the environment inside the solar power plant remains dry and tidy, all incoming and outgoing cable ducts need to be sealed. Inadequate sealing of cable ducts poses safety hazards, mainly in the following two scenarios:
1. Inadequate sealing of cable ducts can lead to rainwater, sewage, and even debris flowing into the plant, damaging the equipment inside.
2. Unsealed ducts can become nesting places for small animals or allow them to enter the plant through the ducts, creating operational risks by chewing on various facilities.
The waterproof sealing methods for cables in solar power plants generally include the following two methods:
Traditional Material Filling Waterproof Sealing Measures
1. The ducts are filled with materials such as cement or fireproof clay and must be compacted with a wooden mallet. During this process, the cable may be damaged, posing a risk of electric leakage. Furthermore, if the cement or fireproof clay is not securely fixed within the duct, some areas may not completely contact the duct wall, preventing comprehensive waterproof sealing and possibly leading to water seepage.
2. Water-activated swelling-type sealing materials, such as sealing strips, can be used around the cable sheath. This method has been verified but is generally effective.
New Inflatable Duct Sealing Technology
This method employs inflatable cable duct sealing bags, which are inserted into the duct and inflated to fill the gaps between the cables and the duct walls completely. This achieves waterproof sealing, preventing pests, sewage, and debris from entering the ducts. After extensive user verification, inflatable cable duct sealing bags have shown good sealing effects. The product features the following characteristics:
1. Easy Installation: Uses ordinary compressed air for construction, unaffected by on-site water, electricity, or environmental conditions, reducing operational difficulties and intensity.
2. Quick Installation: A single person can complete the operation in 3-5 minutes, shortening construction time and saving costs. It is also easy to remove and maintain.
3. Excellent Sealing Effect: The product fully isolates air and water vapor flows after installation, keeping the internal duct dry and clean.
4. Wide Working Temperature Range: The airbag and waterproof sealing materials do not age under temperature conditions ranging from -15°C to 60°C.
5. Strong Resistance to Corrosive Effects of Underground Water, Rainwater, and Salt Mist.
6. The flexible sealing technology employed ensures that after proper installation, it creates a buffer to reduce shock between the duct entrance and the cable, capable of withstanding minor axial stretching and vibrations, preventing wear from vertical movement in cable trays. The arc-shaped elastic surface formed by inflation is also resistant to chewing by small animals.
7. If installed correctly and maintained without human destruction, the lifespan can reach up to 20 years.
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