Medium voltage bushing
Our commonly used 24/40.5kV switchgear contact boxes and through-wall bushings basically use internal and external shielding forms, i.e. capacitive voltage divider bus bushings, which are bus bushings made by utilizing the principle of capacitive equipotential shielding and voltage divider to effectively reduce the size of the bushings and withstand higher lightning impulse withstand voltages and […]
Brief introduction of gas-filled cabinet and ring network cabinet
Gas-filled cabinet C-GIS is the abbreviation of gas-insulated switchgear, which is defined according to the form of main switch insulation, corresponding to air-insulated switchgear and solid-insulated switchgear. That is, the switchgear of the switchgear cabinet, circuit breakers and connections and other main circuits are sealed inside the gas box filled with insulating gas, the external […]
American Standard Ring Network Cabinet
The IEEE standard is a standard developed by the American Institute of Electrical and Electronics Engineers to ensure the correct operation and interoperability of electrical equipment, to promote interconnectivity between different devices, and to improve the reliability and safety of equipment, and it is widely used in North America and other regions. According to statistics, […]
Ideal type of switch performance
The current switches commonly used in switchgear are generally categorized as: Disconnect Switches Isolation that is to separate the two parts to achieve the safety requirements, electrical isolation to achieve the two parts of the circuit to achieve a safe electrical gap, even if there are different voltages on both sides, but also do not […]
About Busbar Carrying Capacity
The busbar load capacity is a complex issue, which is a systematic project that needs to be considered within the switchgear system, designed to include cabinet dimensions, cabinet ventilation, and other factors. There are several formulas for calculating current-carrying capacity, all of which are based on the balance between heat generation and heat dissipation. The […]
Why are transformers rated in kVA and not kW?
Transformers are always rated in kVA and not kW As the name suggests, a transformer only transfers power from one circuit to another without changing the values of power and frequency. In other words, it can only raise or lower the values of current and voltage while keeping power and frequency constant. General data is […]
Difference between KYN28A and RMU
Regarding KYN28A center-mounted cabinet and ring network cabinet, these are two concepts. Both of them are switchgear, and switchgear can be categorized according to application, insulation method, structure type and so on. KYN28A center-mounted cabinet is based on the product structure, center-mounted cabinet is an air-insulated metal-enclosed withdrawable circuit breaker switchgear, is relative to the […]
Medium Voltage Switchgear Foreign Project Requirements
1. Introduction With the domestic products going out and the construction of the Belt and Road, more and more Chinese switchgear are also actively participating in the competition of the international market, however, due to the lack of understanding and experience of foreign demand, only some large enterprises can really go out and expand their […]
Switchgear Arc Resistant Faults
Internal arc fault test IAC AFLR 31.5kA/1s, 40kA/1s, and even 50kA/1s, although the risk of arc test is high, there are very many uncertainties, but not through any “special treatment”, through the test is not impossible to pass, the key is that the design of the product must be in full accordance with the internal […]
Medium Voltage Tubular Busbar Switchgear
These two days EP exhibition, Schneider, ABB coincidentally show the medium voltage Tubular Busbar Switchgear. 12kV and 40.5kV air insulated switchgear. Abstract: With the development of carbon peak, carbon neutral, the green, energy-saving medium-voltage switchgear has become the trend of development, in which the use of materials can be saved, reduce non-ferrous metals, etc., the […]