1. Product execution standards

IEC439 "Control Equipment for Low Voltage Switchgear Sets"

GB7251 "Low Voltage Switchgear Sets"

GB4720 "Low Voltage Electrical Control Equipment"

GB9466 Basic Test Methods for Low Voltage Switchgear Sets

2. Usage conditions:

1) The ambient air temperature should not exceed+45 ℃ and should not be lower than -5 ℃. The average temperature within 20 hours shall not exceed+35 ℃.

2) For indoor installation and use, the altitude of the usage location shall not exceed 2000M.

3) The relative humidity of the surrounding air should not exceed 50% at a maximum of+40 ℃, and a higher relative humidity is allowed at lower temperatures. (For example, 90% at+20 ℃) should take into account the potential impact of occasional condensation due to temperature changes.

4) The inclination of the equipment during installation with respect to the vertical plane shall not exceed 5%.

5) The equipment should be installed in places without severe vibration and impact, as well as in places where electrical components are not corroded.

6) When the user has special requirements, negotiate with the manufacturer to resolve them.

3. Electrical parameters

1) Rated voltage: 380V

2) Rated current: ≤ 4000A

3) Rated short-circuit breaking current: 50KA

4) Rated short-time withstand current: 50 (1S) (KA)

5) Rated peak withstand current: 105KA

4. Cabinet and structural characteristics

4.1 The basic framework of GGD is assembled by local welding of 8MF cold bending type, and the thickness of the steel plate used is not less than 2mm. All metal components, in addition to their own anti-corrosion ability, have taken anti-corrosion measures. Oil removal, rust removal, and phosphating treatment should be carried out before painting or spraying (the spraying equipment is advanced electrostatic spraying equipment from Wagner, Germany). Unpainted parts are galvanized and subjected to electrochemical treatment, and the protection level of the shell reaches IP30 standard.

4.2 When designing the GGD cabinet, full consideration should be given to the heat dissipation issues during cabinet operation. There are different numbers of heat dissipation slots on both ends of the cabinet. When the electrical components inside the cabinet heat up, the heat rises and is discharged through the upper slot. Cold air is continuously replenished into the cabinet through the lower slot, forming a natural ventilation duct from bottom to top in the sealed cabinet, achieving the purpose of heat dissipation.

4.3 According to the requirements of modern industrial product manufacturing design, the 4.3GGD cabinet adopts the golden ratio method to design the appearance of the cabinet and the division dimensions of each part, making the whole cabinet beautiful, elegant, and new.

4.4 The instrument door equipped with electrical components has multiple strands of soft copper wire connected to the frame, and the installation parts inside the cabinet are connected to the frame with rolling screws, forming a complete grounding protection circuit.

4.5 The busbar connection is tight, with good contact and neat and beautiful configuration. When connecting different metal busbars or busbars to electrical terminals, measures should be taken in the process to prevent electrical corrosion and ensure that the busbar connection does not deform under pressure.

4.6 The busbar clamp is made of high-strength and high flame retardant PPO alloy material thermoplastic molding, with high insulation strength, good self extinguishing performance, unique structure, and can be easily combined into single busbar clamp and double busbar clamp by adjusting the building block. The insulation support is a sleeve type molded structure, using specialized ZMJ type combined busbar clamps and insulation support components with high strength, which solves the problem of insufficient creepage distance in old products.

4.7 The minimum distance between the primary circuit electrical equipment and busbar in the low voltage cabinet and other live conductors shall not be less than 12mm for electrical clearance and 12mm for creepage distance.

4.8 The connecting wires for meter, control, signal, and protection circuits shall be copper core insulated wires with a minimum cross-sectional area of not less than 1.5mm2. The minimum cross-sectional area of copper wires from the secondary winding of the current transformer to the terminal block shall be not less than 2.5mm2. Current circuit installation test terminal. The insulation of the wire should be selected based on a working voltage of not less than 500V.

4.9 Correct wiring, secure fixation, neat arrangement, horizontal and vertical alignment; Clear and complete circuit numbering, using standard line numbering; Each terminal should have no more than 2 wires connected.

4.10 Insulated wires pass through metal plate holes and insulation sheaths are installed on the plate holes.

4.11 All equipment and materials used shall comply with the current technical standards issued by the state, have a certificate of conformity, and have nameplates.