Overseas Low Voltage Switchgear

Overseas low voltage switchgear

Low-voltage switchgear is used to introduce and distribute the transformer-reduced power to the specific application loads, according to the decentralized, ring-net type, multiple feeder switching and other distribution methods have different combinations, according to the type of load there are power distribution, motor control and other application differences, in order to regulate the power factor, to ensure that out of the work required reactive power compensation and so on.

 

But the core is the introduction of power distribution, that is, power switching control and protection, its failure will directly lead to power outages, so switching equipment must be high-performance, highly reliable. Therefore, the switchgear must be high-performance and highly reliable. Other auxiliary facilities, the failure of which will not cause power interruption.

 

Power switchgear (main distribution cabinet) current, short-circuit current, the need for high current, large short-circuit breaking capacity, large short-circuit withstand capacity, high protection capacity and other high ratings, the switch selected frame circuit breaker.

 

Low-voltage switchgear horizontal bus carries the current of all outgoing loads, if it is a multi-section bus or multi-way feeder, the horizontal bus current will be larger, such as ships use the system, multiple generators in parallel to the feeder, the main bus current is very large, 8000/10000A will be available, so a reasonable arrangement of the bus is very necessary. Horizontal main busbar is at the bottom of the cabinet, which can carry large current.

 

Motor and other outgoing (MCC) circuits are arranged separately, separated from the main power distribution equipment, except for the main inlet contact with the selection of frame circuit breakers, the other motor outgoing, reactive power compensation is arranged nearby to reduce energy loss.

 

 

Motor control current is small, short-circuit current is small, so the system switchgear busbar is small and centralized, which is easy to control and save cost.

 

With the main draw-out pallet, the control components are installed on the pallet, system integration, convenient wiring.

 

Distribution outlet circuits, each circuit current is small, the use of molded case circuit breakers, centralized installation, fixed, installation density is very high, cable connection is convenient, maintenance and repair is also easy.

 

The main busbar is not necessarily installed at the top of the cabinet, installed at the back of the switchgear cabinet is favorable for current distribution, low temperature rise. Small current, saving the use of copper row.

 

Foreign switchgear cabinet will not put all incoming, outgoing, reactive power compensation, industrial control and all other switchgear in one arrangement, the bus current is large.

 

We like big and complete, different switches, different functions mixed together, due to all the functions installed in a row of switchgear, dozens of switchgear side by side, spectacular, just maintenance and repair are not convenient. The main bus carries all the feeder currents, so whether it is compensation or frequency conversion and other industrial control cabinets require the same large main bus, resulting in a large number of copper consumption.

 

The advantage of power distribution molded case circuit breaker using drawer type is that it can be integrated with electric power measurement function, transformer + multi-function meter to realize real-time monitoring, communication function to realize background data statistics, operation and maintenance management.

 

In order to realize the data monitoring, the use of intelligent circuit breaker can be realized, the same use of intelligent monitoring terminal can also be measured, communication.

 

Intelligent monitoring terminal can also realize switch temperature rise monitoring, timely detection of overheating combustion events.

 

The use of drawer connectors increases the circuit heating, increases the point of failure, installation density is small. For power distribution circuits fixed installation is more reliable and economical. For motor control circuits, circuit breakers, contactors, relays or motor protection devices, with many components, complex wiring, and many points of failure, mounted on a drawer, it is convenient to pull out the cabinet for inspection, replacement and other operations. Drawer current is small, the connectors are more safe and reliable, no need to swing into the mechanism, manually push and pull out can be.

 

Switchgear according to the function, the application of the distinction between the layout, that can ensure the continuity of power supply resources, reliability, but also conducive to saving resources, saving energy loss, low-carbon environmental protection, the new quality of productivity, power distribution also need to be more efficient, energy-saving.