Medium Voltage Switch Cabinet

The voltage range of the medium voltage switch cabinet can also be extended to within 36kV, including more common voltage levels such as 3kV, 6kV, 10kV, 20kV, and 35kV.

Application areas: Medium voltage switch cabinets are mainly used in urban residential areas, public buildings, highways, chemical industries, etc., for power transmission and distribution and substation inlet and outlet control and protection.

What is a medium voltage switch cabinet? Metal-enclosed switchgear, which has good insulation performance for other equipment other than medium voltage switches, prevents arcs from burning through power equipment, ensures the safety of power use, and also avoids the expansion of the fault range of medium voltage switches when using electricity. The medium voltage switch cabinet consists of two major parts: the cabinet body and the circuit breaker, and has functions such as overhead inlet and outlet lines, cable inlet and outlet lines, and busbar connection. The cabinet body consists of a housing, electrical components (including insulating parts), various mechanisms, secondary terminals and connections.

What are the categories of medium-voltage switchgear?

According to the structure of medium-voltage switchgear, there are several categories of medium-voltage switchgear:

(1) Semi-enclosed medium-voltage switchgear, the front and sides of the cabinet are enclosed, the back and busbar are exposed, the structure is simple, the cost is low, the safety is poor, and it is close to being eliminated, such as GGlA type.

(2) Box-type medium-voltage switchgear, with a metal shell, but fewer compartments, the busbar is also enclosed, and the safety is better. Such as XGN type.

(3) Interval-type medium-voltage switchgear, each room is separated by one or more non-metallic partitions, and the safety is better. Such as JYN type.

(4) Armored medium-voltage switchgear, each room is separated by metal partitions and grounded, with good safety, complex structure, high processing precision, and slightly higher price. Such as KYN type made in China and ZSl type of ABB.

Model Description

Main Technical Parameters

Structure And Mounting Dimensions

Working Environment：

The use environment requirements of medium-voltage switchgear include temperature, humidity, altitude, air quality and other aspects.‌

1. Temperature requirements‌: The temperature requirements of medium-voltage switchgear are generally -5℃~+40℃. When the temperature exceeds this range, the electrical performance, mechanical performance and protection level of the electrical cabinet will be affected‌.

‌2. Humidity requirements‌: The humidity requirements of medium-voltage switchgear are generally that the relative humidity does not exceed 50%. When the humidity is too high, leakage, insulation reduction and other problems may occur inside the electrical cabinet, affecting the service life and safety of the equipment‌

3. Altitude requirements‌: For high-altitude areas, medium-voltage switchgear needs to be used at reduced capacity or subjected to withstand voltage tests in accordance with relevant standards. For example, at an altitude of 3,000 meters, insulation correction and withstand voltage tests are required to ensure the normal operation of the equipment‌

4‌. Air quality requirements‌: The air quality requirements of medium-voltage switchgear are relatively high, and generally do not contain corrosive gases, dust and other harmful substances. When these harmful substances exist in the air, they will damage electrical equipment and affect the service life and safety of the equipment‌

Advantages and features of switchgear

The main features and advantages of medium-voltage switchgear include the following aspects:

1. High performance parameters: Medium-voltage switchgear has excellent performance parameters, such as high voltage withstand capability and short-circuit current withstand capability. For example, the lightning impulse withstand voltage of medium-voltage switchgear reaches 75kV, and the rated short-time withstand current can reach 25-40kA. It can operate stably under various high-voltage environments, effectively resist fault shocks such as overvoltage and short-circuit current in the power system, and ensure the continuity of power supply.

2. Good insulation and arcing performance: Medium-voltage switchgear is designed with good insulation and arcing performance. For example, the internal arcing capacity of medium-voltage switchgear reaches 31.5kA/4S and 40kA/0.5S, which meets the IAC-level AFLR standard, can effectively limit the impact range of arc during internal faults, reduce damage to the cabinet and surrounding equipment, and ensure the safety of personnel and equipment.

3. Modular and miniaturized design: Medium-voltage switchgear usually adopts modular design, which is easy to produce, assemble, maintain and overhaul. For example, the cabinet of the medium-voltage switchgear is divided into independent functional units such as busbar room, circuit breaker room, cable room, and control compartment. The size and connection interface of each unit are standardized, which is convenient for fault location and isolation, reducing power outage time and maintenance costs.

4. In addition, the cabinet width of some models is only 550mm, which greatly reduces the floor space and is suitable for places with tight land resources.

5. Intelligent functions: Modern medium-voltage switchgear has a variety of intelligent functions, including embedded intelligent temperature monitoring, vacuum arc chamber characteristic monitoring, trolley cabinet intelligent monitoring, mechanical characteristics and secondary circuit monitoring, etc., which can grasp the equipment operation status in real time, discover potential fault hazards in time, provide data support for predictive maintenance, reduce equipment failure rate, and intelligent control and operation functions such as electric trolley and ground knife control, monitoring and protection, etc., improve the degree of equipment automation and operation safety. 6. High safety guarantee: The medium-voltage switchgear is designed with five-protection interlocking and other safety measures. For example, the medium-voltage switchgear adopts a five-protection interlock design to prevent misoperation such as pushing and pulling the circuit breaker trolley under load, mis-opening and mis-closing the circuit breaker, etc., fundamentally ensuring the safety of operators.

Product Real Shot

FAQ

Can your company customize products according to my requirements?

Yes, we can customize products according to customer requirements. Generally speaking, customers only need to provide: Circuit layout, voltage, current, etc.

What is your fastest delivery time?

Normally, we accept customer inquiries. After the switch cabinet technical parameters are connected, it takes 1-2 days to issue a price list and communicate with customers about the production and delivery time based on the actual situation.

How is your after-sales service?

We support a 1-year warranty. The normal quotation does not include on-site after-sales service. Free online communication and guidance are available.