With the expansion of industrial production scale and the upgrading of equipment, the power distribution systems of many old industrial plants can no longer meet the production needs. Power distribution renovation has become an important measure to improve production efficiency and ensure electricity safety. As the core component of power distribution renovation, the selection and application of electrical accessories directly affect the effect, safety and economy of power distribution renovation. Today, we will discuss the selection principles and application points of electrical accessories in industrial plant power distribution renovation, providing professional reference for enterprises' power distribution renovation.

I. Selection Principles of Electrical Accessories

1. Safety Principle: The core demand of power distribution renovation is to ensure electricity safety. Therefore, the selection of electrical accessories must give priority to safety, and select products that meet national electrical standards, have 3C certification and reliable quality. For example, circuit breakers must have good short-circuit protection and overload protection functions, and terminal blocks must have excellent insulation and contact performance, to avoid safety accidents caused by poor accessory quality.

2. Adaptability Principle: The selected electrical accessories must be compatible with the power distribution capacity, equipment needs and use environment of the plant. For example, select circuit breakers and cables with appropriate rated current according to the total power load of the plant; select corresponding contactors and relays according to the working parameters of the equipment; select waterproof, dustproof and high-temperature resistant accessories according to the plant environment (such as high temperature, humidity, dust).

3. Economy Principle: On the premise of ensuring safety and adaptability, select electrical accessories with high cost performance to reasonably control the cost of power distribution renovation. Hierarchical selection can be carried out according to the importance of accessories. High-quality brand products are selected for key parts (such as main distribution boxes), and qualified cost-effective products are selected for ordinary parts, avoiding cost waste caused by blind pursuit of high-end.

4. Scalability Principle: Considering the future production development and equipment upgrading of the enterprise, the selected electrical accessories should have a certain degree of scalability. For example, select expandable rail-type terminals and modular circuit breakers, which facilitate wiring and power distribution expansion when adding equipment later, reducing the cost of secondary renovation.

II. Application Points of Core Electrical Accessories

1. Circuit Breakers: As the core protection component of the power distribution system, the appropriate model should be selected according to the power load and short-circuit current of the plant to ensure that it can effectively cut off the short-circuit current and protect the circuit and equipment. Molded case circuit breakers can be selected for the main distribution box, and miniature circuit breakers can be selected for branch circuits. At the same time, leakage protectors should be configured to prevent leakage accidents.

2. Cables and Cable Glands: Select cables that meet national standards, and select appropriate cable diameter and material according to the power load and laying method to avoid cable overheating due to overload. Cable glands should be selected with models matching the cable specifications and good sealing performance. Especially in humid and dusty environments, waterproof cable glands should be selected to prevent cable water ingress and short circuits.

3. Contactors and Relays: Select appropriate contactors and relays according to the control needs of the equipment, ensure that their rated current and coil voltage match the equipment, and can stably control the start and stop of the equipment. For equipment that starts and stops frequently, contactors with strong durability and long contact life should be selected to reduce the failure rate.

4. Terminal Blocks: Select terminal blocks with uniform specifications and convenient installation to ensure firm wire connection and good contact. It is recommended to select rail-type terminals to facilitate later maintenance and expansion. At the same time, select appropriate terminal models according to the wire specifications and quantity to avoid mixed connection and overload.

We have rich experience in supplying electrical accessories for industrial plant power distribution renovation. According to the enterprise's power distribution renovation needs, we can provide one-stop accessory selection, supply and technical guidance services, ensuring reasonable selection and standardized application of accessories, helping enterprises complete power distribution renovation and improve electricity safety and production efficiency.