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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
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This product's main material is high-strength SMC glass fiber composite material, molded in a mold under high temperature and pressure in one piece. The material is dense and has no weak points, making it stronger than ordinary fiberglass shells. The main body of the intermediate joint is covered with self-adhesive fireproof and arc-resistant tape. The gaps between the inside of the explosion-proof box and the cable are filled with expanding flame-retardant flexible fireproof putty. In addition, expanding explosion-proof fire-retardant bags are placed inside the explosion-proof box. With the protection of the external high-strength flame-retardant explosion-proof box, the overall structure adopts a three-layer fireproof and explosion-proof method, thereby achieving the overall fireproof and explosion-proof function. The product has passed the explosion-proof certificate verification and testing of the National Explosion-proof Electrical Products Quality Supervision and Inspection Center , meeting the requirements of standards GB 3836.1-2010 "Explosive Atmospheres - Part 1: Equipment - General Requirements" and GB 3836.3-2010 "Explosive Atmospheres - Part 3: Equipment Protected by Increased Safety 'e'" . This product is mainly used in power cable intermediate joints to confine the high-pressure gas flow, flames, and debris generated by an explosion within an explosion-proof box when a fault occurs. It also prevents the spread of fire and the impact of the explosion from causing widespread damage to other power facilities. The fireproof and explosion-proof box is installed outside the intermediate joint. During normal operation, it protects the intermediate joint from external damage, providing a certain degree of mechanical protection, and also prevents damage to the intermediate joint from the spread of fire from surrounding power facilities. When the intermediate joint catches fire or explodes due to an accidental fault, it provides fire and explosion protection, and also offers some protection and isolation to other cables or surrounding equipment in the cable trench. The fireproof and explosion-proof box for intermediate joints is a two-part assembly, facilitating on-site installation. The flange joints on both sides of the explosion-proof box have sealing strips, and the ends are wrapped with waterproof tape, providing a certain degree of waterproofing.
Features:
- 1. Three-layer explosion-proof structure provides all-round protection for cable joints.
- 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 to prevent the flame caused by the intermediate joint from spreading due to breakdown and combustion.
- 3. Place an expansion-type flame-retardant explosion-proof fire arrestor bag inside the explosion-proof box to buffer the lateral shock wave caused by the explosion and prevent the flame from spreading further. Fill the gaps between the inside of the explosion-proof box and the cable with flexible fireproof putty to buffer the longitudinal shock wave caused by the explosion and prevent the flame from spreading further to the cable.
4. The high-strength explosion-proof box shell confines the high-pressure gas flow, flames and debris generated by the explosion within the explosion-proof box. At the same time, it prevents the spread of fire caused by the fault and the explosion impact from causing widespread damage to other power facilities. It also prevents damage to intermediate joints due to the spread of combustion of power facilities around the joint, while ensuring pedestrian safety.
Actual picture of the explosion-proof box shell
10KV three-core cable intermediate joint SMC explosion-proof box (1200mm×Φ180mm) (outer shell is non-flame retardant)
10KV Three-Core Cable Interchange 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) (outer shell is not flame retardant)
10KV Three-Core Cable Interchange Joint SMC Fireproof and Explosion-proof Box (1600mm×Φ180mm) ( Flame-retardant Shell)
10KV Three-Core Cable Interchange Joint SMC Fireproof and Explosion-proof Box (Reinforced) (1600mm × Φ 180mm)
( Flame-retardant casing)
35KV three-core cable intermediate joint SMC explosion-proof box (2100mm×Φ240mm) (outer shell is non-flame retardant)
35KV Three-Core Cable Interchange Joint SMC Fireproof and Explosion-proof Box (2100mm×Φ240mm) (Flame-retardant Shell)
Product Parameters
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Serial Number Inspection items Technical Requirements 1 Lightning impulse withstand voltage test (75kV peak) No breakdown of the sample 2 Explosion test (12KV, 20KA, 0.1s) The sample was undamaged and without cracks. 3 Structural inspection of relevant clauses in GB3836.1 and GB3836.3. Complete machine 1) Nameplates and warning signs comply with standard requirements. 2) Grounding and markings comply with standard requirements. 3) The structure meets standard requirements. 4 Impact resistance test GB3836.1 26.4 shell The outer shell withstood the impact energy generated by a 1.0 kg test object falling vertically from a height of 0.7 m, and the result was no damage. 5 Temperature test GB3836.1 26.5.1 Complete machine The sample casing, cable core joints, cable encapsulation areas, and the highest surface temperature of the sealing gaskets meet the standard requirements. 6 Heat and cold resistance tests GB3836.1 26.8, 26.9 Gaskets, cable encapsulation areas, and housings The sample was stored continuously for 14 days in an environment with a relative humidity of 90% and a temperature of 95.0℃, then placed in an environment with a temperature of 122.0℃ for 14 days. After being taken out, it was placed at ambient temperature for 24 hours, and then placed in an environment with a temperature of -30℃ for 1 day. After the test, there were no obvious changes in the sealing gasket, the cable encapsulation part, and the outer shell. 7 Enclosure protection rating test GB3836.1 26.4.5 Complete machine Level 6 dustproof test: Place the sample in a dustproof chamber, connect the air extraction pipe, ensure the negative pressure is less than 2 kPa, and conduct the test for 2 hours. After the test, check that no dust has entered the sample. Level 6 waterproof test: Conduct the test using a Φ12.5mm nozzle test device, with a total flow rate of 100 L/min and a test time of 3 minutes. After the test, check that no water has entered the sample. 8 Clamping test of the device is specified in Appendix A.3 of GB3836.1. Introduction device A tensile force of 960N was applied to the cable for 6 hours, and no displacement was observed. 9 Insulation dielectric strength test GB3836.36.1 Relatively A test voltage of 21000V was applied between the phases of the sample and between the phase and ground for 60 seconds, and no breakdown occurred. 10 Acid and alkali resistant (GB11547) SMC material for the outer casing No obvious deformation 11 Flame retardant properties (GB2408) Explosion-proof box made of SMC material VO
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