Three requirements and three protection functions of AC distribution cabinet

  The distribution cabinet can be divided into high-voltage distribution cabinet, low-voltage distribution cabinet and AC distribution cabinet and DC distribution cabinet according to voltage and current, and each has its own characteristics and advantages
In the market, the demand for AC distribution cabinet is much larger than that of other types
Specifically, the AC distribution cabinet system has three requirements, and the AC distribution cabinet also has three protection functions
Let's have a detailed understanding and analysis of these two aspects
1
structural requirements for AC distribution cabinet system (1) high altitude areas with low air pressure, low air density and poor heat dissipation conditions have a great impact on low-voltage electrical equipment, so a large margin must be reserved in the design capacity to reduce the temperature rise during operation
In full consideration of the environmental conditions in Tibet, according to the above design requirements, a certain margin shall be reserved for the selection of low-voltage electrical components in the design of the AC distribution cabinet system to ensure the reliability of the system
(2) the AC distribution cabinet for maintenance and repair shall be of external open double maintenance structure, which is welded and combined with thin steel plate and angle steel
Small openable door in front of screen; There is an instrument panel above the screen, which can be installed with various indicators
In a word, the distribution cabinet shall be convenient for maintenance and repair (3) the grounding AC distribution cabinet shall be provided with a good grounding protection system
The main grounding point shall generally be welded on the framework under the cabinet, and the instrument panel shall also be connected with the cabinet body, so as to form a complete grounding protection circuit, so as to reliably prevent the operator from electric shock
2
protection function of AC distribution cabinet AC distribution cabinet shall have the protection function of multiple line faults
Once the protection action occurs, the user can handle it according to the situation, eliminate the fault and restore the power supply
(1) in case of short circuit or over effect fault in the output circuit of transmission overload and short-circuit protection buzzer, the corresponding circuit breaker will automatically jump rigid and cut off eight outputs
In case of more severe fatigue, the fuse may even burn out; At this time, first find out the cause, eliminate the fault, and then connect the load
(2) input undervoltage protection when the input voltage of the system drops to 70-35% of the rated power supply, the input control switch will automatically trip and power off; When the input voltage of the system is lower than 35% of the rated voltage, the circuit breaker switch cannot be closed for power transmission
At this time, check the cause, increase the input voltage of the distribution tank, and then restore the power supply
When the AC distribution cabinet is powered by inverter input, it has the function of battery undervoltage protection
When the provincial battery discharge reaches a certain depth, the controller sends a signal to cut off the load, controls the distribution cabinet, and the load relay of P acts to cut off the added load
When power transmission is restored, only button operation is required (3) input interlock protection the safest protection for the AC distribution cabinet of the photovoltaic power station is the dual interlock protection of the relay and circuit breaker switch of the toilet circuit input: the interlock protection function is that when there is 41 in one circuit of inverter input or diesel generator set input, the other circuit of relay can be closed automatically, that is, the button operation is on fire
That is to say, the interlock protection of circuit breaker switch is to allow only one switch to be closed and energized
At this time, if the other switch is also closed, the two circuits will be cut off at the same time
Manufacturer of distribution cabinet: http://www
jtcele
com/