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SMC explosion-proof box for cable intermediate joint
SMC explosion-proof box for cable intermediate joint
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Application areas:
Suitable for external protection of 10-35KV cable intermediate joints.
Product Description:
This product is constructed from high-strength SMC fiberglass composite material, molded in a single step under high temperature and pressure within a mold. This dense material eliminates weak points and offers superior strength compared to conventional fiberglass shells. The main connector is covered with self-adhesive fire- and arc-resistant tape. The gaps between the explosion-proof box and the cable are sealed with intumescent flame-retardant flexible fire-retardant putty. Furthermore, intumescent fire-retardant packing is placed within the explosion-proof box. Combined with the protection of the high-strength flame-retardant explosion-proof box, the overall structure achieves a three-layer fire and explosion protection system. This product has passed explosion-proof certification testing and verification by the National Explosion-Proof Electrical Product Quality Supervision and Inspection Center , meeting the requirements of GB 3836.1-2010, "Explosive Atmospheres Part 1: General Requirements for Equipment," and GB 3836.3-2010, "Explosive Atmospheres Part 3: Equipment Protected by Increased Safety (e)." This product is primarily used for intermediate joints of power cables. In the event of a fault, it confines the high-pressure airflow, flames, and debris generated by the explosion within the explosion-proof box, preventing the spread of fire and the impact of the explosion, which can cause widespread damage to other power facilities. The fireproof and explosion-proof box is installed on the outside of the intermediate joint. During normal operation, it protects the intermediate joint from external forces, providing a certain degree of mechanical protection. It also prevents damage to the intermediate joint due to the spread of fire in the power facilities surrounding the joint. When the intermediate joint catches fire or explodes due to an unexpected fault, it can provide fire and explosion protection, and also provide a certain degree of protection and isolation for other cables or surrounding equipment in the cable trench. The fireproof and explosion-proof box for the intermediate joint consists of two halves that fit together, making it easy to install on-site. Sealing strips are installed at the flange joints on both sides of the explosion-proof box, and waterproof tape is wrapped around both ends to ensure a certain degree of waterproofing.
Features:
- 1. Three-layer overall explosion-proof structure provides all-round protection for cable connectors.
- 2. The main body of the intermediate joint is covered with self-adhesive fireproof and arc-resistant tape to protect the intermediate joint from external flame burns and prevent the flame caused by breakdown and combustion of the intermediate joint from expanding.
- 3. Place an intumescent flame-retardant explosion-proof fire retardant bag inside the explosion-proof box to cushion the horizontal shock wave caused by the explosion and prevent the flame from spreading further. Fill the gap between the two ends of the explosion-proof box and the cable with flexible fireproof putty to cushion the vertical shock wave caused by the explosion and prevent the flame from spreading further to the cable.
4. The high-strength explosion-proof box shell limits the high-pressure airflow, flames and fragments generated by the explosion within the explosion-proof box, while preventing the spread of fire and explosion impact caused by the fault from causing large-scale damage to other power facilities. It also prevents the spread of fire to power facilities around the joint from damaging the intermediate joint, while ensuring the safety of pedestrians.
Actual picture of explosion-proof box shell
10KV three-core cable intermediate joint SMC explosion-proof box (1200mm×Φ180mm) (shell is not flame retardant)
10KV three-core cable intermediate joint SMC fireproof and explosion-proof box (1200mm×Φ180mm) (flame retardant shell)
10KV three-core cable intermediate joint SMC fireproof and explosion-proof box (1100mm × Φ 180mm) ( flame retardant shell)
10KV three-core cable intermediate joint SMC explosion-proof box (1600mm×Φ180mm) (shell is not flame retardant)
10KV three-core cable intermediate joint SMC fireproof and explosion-proof box (1600mm×Φ180mm) ( flame retardant shell)
10KV three-core cable intermediate joint SMC fireproof and explosion-proof box (reinforced type) (1600mm × Φ 180mm)
( flame retardant shell)
35KV three-core cable intermediate joint SMC explosion-proof box (2100mm×Φ240mm) (shell is not flame retardant)
35KV three-core cable intermediate joint SMC fireproof and explosion-proof box (2100mm×Φ240mm) (flame retardant shell)
Product parameters:
| Serial number | Inspection items | Technical requirements | |
| 1 | Lightning impulse withstand voltage test (75KV peak) | No breakdown of samples | |
| 2 | Explosion test (12KV, 20KA, 0.1s) | The sample has no damage or cracking | |
| 3 | Structural inspection GB3836.1 GB3836.3 related provisions | Complete machine | 1) Nameplates and warning signs comply with standard requirements. 2) Grounding and markings comply with standard requirements. 3) Structures comply with standard requirements. |
| 4 | Impact resistance test GB3836.1 26.4 | shell | The shell withstands the impact energy generated by a test object with a mass of 1.0 kg falling vertically from a height of 0.7 m, and there is no damage. |
| 5 | Temperature test GB3836.1 26.5.1 | Complete machine | The maximum surface temperature of the sample casing, cable core joints, cable sealing areas, and sealing gaskets meet the standard requirements. |
| 6 | Heat and cold resistance test GB3836.1 26.8, 26.9 | Sealing pads, cable sealing parts, housing | The samples were stored continuously in an environment with a relative humidity of 90% and a temperature of 95.0℃ for 14 days, then placed in an environment of 122.0℃ for 14 days, taken out and placed at ambient temperature for 24 hours, and then placed in an environment of -30℃ for 1 day. After the test, there was no obvious change in the sealing gasket, cable sealing part and casing. |
| 7 | Enclosure protection grade test GB3836.1 26.4.5 | Complete machine | Level 6 Dustproof Test: Place the sample in a dustproof box, connect the exhaust pipe, and set the negative pressure to less than 2KPa. The test lasts for 2 hours. After the test, check that no dust has entered the sample. Level 6 Waterproof Test: Use a Φ12.5mm nozzle test device with a total flow rate of 100L/min for 3 minutes. After the test, check that no water has entered the sample. |
| 8 | Introduction device clamping test GB3836.1 Appendix A.3 | Introduction device | A tensile force of 960 N was applied to the cable for 6 h, resulting in no displacement. |
| 9 | Insulation dielectric strength test GB3836.36.1 | Relatively | A test voltage of 21000V was applied between the phases and between the phases and the ground of the samples for 60s, and no breakdown occurred. |
| 10 | Acid and alkali resistance (GB11547) | Shell SMC material | No obvious deformation |
| 11 | Flame retardant properties (GB2408) | Explosion-proof box SMC material | VO |
