29

2024-10

Chengyuan Electric and Siemens join forces to create a better future!

On October 23, 2024, at 2:00 PM, Chengyuan Electric successfully held a project communication and technical sharing meeting with Siemens in the first-floor exhibition hall of the factory. The purpose of this meeting was to strengthen cooperation and communication between both parties, promote innovation, and jointly advance the development of the smart electrical field.

2024-10-29

Chengyuan Electric and Siemens join forces to create a better future!

03

2022-06

What details should be noted for maintenance of the distribution box?

1. The power switching and protection frequency conversion cabinet is equipped with a low-voltage molded case circuit breaker connected to the incoming power supply. In addition to being able to connect and disconnect the circuit, it can also provide short-circuit and overload protection for the circuit and the frequency converter. It can cut off the power supply during protection. 2. Start and stop control functions are set on the frequency conversion cabinet panel, including frequency conversion start and stop buttons, for the operational control of frequency conversion equipment, making it convenient for on-site operation.

2022-06-03

What details should be noted for maintenance of the distribution box?

29

2022-05

Fault analysis during the use of distribution cabinets

The disadvantages caused by the impact of ambient temperature on low-voltage electrical appliances in distribution cabinets include components such as fuses, AC contactors, residual current devices, capacitors, and measuring instruments. These low-voltage electrical appliances are designed and manufactured according to GB1497 "Basic Standards for Low-Voltage Electrical Appliances," which stipulates the normal operating conditions: the upper limit of ambient air temperature should not exceed 40°C. The average ambient air temperature over 24 hours should not exceed 35°C; the lower limit of ambient air temperature should not be lower than -5°C or -25°C. The distribution cabinets in rural power grid renovation work outdoors, where they are not only exposed to direct sunlight causing high temperatures but also generate heat during operation. Therefore, during the hot summer months, the internal temperature of the cabinet can reach above 60°C, significantly exceeding the environmental temperature limits set for these appliances, leading to failures due to overheating of electrical components inside the distribution cabinet. Failures caused by product quality issues arise during rural power grid renovations due to the large number of required distribution cabinets and short construction periods. The manufacturers of distribution cabinets face urgent demands for low-voltage electrical appliances in large quantities, resulting in a lax approach to product quality. Consequently, some products experience failures shortly after being put into operation. For instance, certain types of AC contactors may fail shortly after the distribution cabinet is commissioned due to burnt-out coil circuits. Failures caused by improper selection of electrical appliances in the distribution cabinet occur because the capacity selection for AC contactors during manufacturing is not very appropriate. Identical capacity AC contactors are used for different outgoing circuits without considering the imbalance of three-phase loads. As a result, some outgoing contactors' current ratings were not upgraded by one level based on normal selection criteria, leading to instances of AC contactor burnout during high-temperature summer operations.

2022-05-29

Fault analysis during the use of distribution cabinets

21

2022-05

Introduction to the development situation of the distribution box industry

According to industry statistical analysis, in the context of a not very prosperous global economy, the distribution box industry, like our country's economy, has still achieved steady progress and stable operation. With the gradual expansion following the construction of power facilities, the demand for distribution boxes both domestically and internationally is generally in an expanding state, and the market prospects are relatively promising. However, there is an oversupply of domestic distribution box production capacity, companies generally lack sufficient independent innovation capabilities, and there is a lack of competitiveness in the high-end market, indicating that the momentum for development is still insufficient.

2022-05-21

Introduction to the development situation of the distribution box industry

13

2022-05

Introduction to electrical clearance in low-voltage distribution boxes

The electrical clearance between the center of the bare live parts and the center of the enclosure of different low-pressure metal enclosures must be greater than 20mm. The electrical clearance between the bare live parts in the control circuit and the center of the grounding device's metal products must also be greater than 20mm. When the distance between bus ducts is less than 20mm, bundling insulation methods should be used, and the distance should be based on the following requirements:

2022-05-13

Introduction to electrical clearance in low-voltage distribution boxes

08

2022-05

What conveniences does a rack cabinet provide for data center service equipment?

The row cabinet provides power to the data center service equipment, including power distribution and protection functions. It is generally divided into three types based on the nature of the power: communication row cabinets, low-voltage DC row cabinets, and high-voltage DC row cabinets. The row cabinets are placed at the front end of each row of cabinets in the data center, serving as the power distribution for all rear cabinets and inter-row air conditioning.

2022-05-08

What conveniences does a rack cabinet provide for data center service equipment?
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