Analysis of the Development Direction of High and Low Voltage Distribution Cabinet
Release time:
2021-09-30
As the "blood vessel" and "nerve" of the national economy, distribution cabinets are crucial for the development of China's national economy. If there are problems in nature, how should we solve them? Is this also a problem?
First: Dynamic thermal stability
Due to high voltage, medium voltage switchgear emphasizes electrical clearances and thermal stability; Low voltage switchgear emphasizes temperature rise and dynamic thermal stability.
Therefore, in the design of low-voltage switchgear, the words "temperature rise" will continue to appear, and the short-term and peak withstand of the main busbar will also continue to appear; The medium voltage switchgear emphasizes whether the electrical clearance distance meets the requirements, how stable the thermal stability is, and the requirements for temperature rise are not as high as the design of low voltage switchgear.
According to the surface treatment of the busbar (bare copper, tin, silver), the temperature rise of the main busbar in the low-voltage switchgear is divided into 60K, 65K, and 70K.
2： Short circuit breaking capacity
The low-voltage circuit breaker is equipped with a tripping device, and the short circuit protection and overload protection are measured and operated by the circuit breaker itself; The medium voltage circuit breaker must be tripped by a relay protection device.
The short time withstand capacity of medium voltage circuit breakers is generally 3 seconds, while the short time withstand capacity of low voltage circuit breakers is generally 1 second.
The concept of short-circuit breaking capacity is very important. It is the core parameter of low-voltage and medium voltage cabinets.
Thirdly, there are multiple installation circuits for low-voltage cabinets, fewer installation circuits for medium voltage cabinets, and single cabinet and single circuit.
Because the standard understanding of power distribution cabinets is tedious, it is difficult to understand what is going on without a combination of physical objects. Therefore, it is necessary to further understand while carefully studying products and standards. Finally, I believe that under the guidance of quality, China will have more excellent brands in the distribution cabinet industry, no longer overly reliant on imports, and close the gap with international standards to achieve global leadership!
First: Dynamic thermal stability
Due to high voltage, medium voltage switchgear emphasizes electrical clearances and thermal stability; Low voltage switchgear emphasizes temperature rise and dynamic thermal stability.
Therefore, in the design of low-voltage switchgear, the words "temperature rise" will continue to appear, and the short-term and peak withstand of the main busbar will also continue to appear; The medium voltage switchgear emphasizes whether the electrical clearance distance meets the requirements, how stable the thermal stability is, and the requirements for temperature rise are not as high as the design of low voltage switchgear.
According to the surface treatment of the busbar (bare copper, tin, silver), the temperature rise of the main busbar in the low-voltage switchgear is divided into 60K, 65K, and 70K.
2： Short circuit breaking capacity
The low-voltage circuit breaker is equipped with a tripping device, and the short circuit protection and overload protection are measured and operated by the circuit breaker itself; The medium voltage circuit breaker must be tripped by a relay protection device.
The short time withstand capacity of medium voltage circuit breakers is generally 3 seconds, while the short time withstand capacity of low voltage circuit breakers is generally 1 second.
The concept of short-circuit breaking capacity is very important. It is the core parameter of low-voltage and medium voltage cabinets.
Thirdly, there are multiple installation circuits for low-voltage cabinets, fewer installation circuits for medium voltage cabinets, and single cabinet and single circuit.
Because the standard understanding of power distribution cabinets is tedious, it is difficult to understand what is going on without a combination of physical objects. Therefore, it is necessary to further understand while carefully studying products and standards. Finally, I believe that under the guidance of quality, China will have more excellent brands in the distribution cabinet industry, no longer overly reliant on imports, and close the gap with international standards to achieve global leadership!
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