How to Add a Power Distribution System to the Distribution Box?

How to add a distribution system to a distribution box? First, the main distribution box, sub-distribution box, and switch box should be set up in the order of ''main-sub-switch'' to form a ''three-level distribution'' mode.

Main Distribution Box

The main distribution box consists of an incoming unit and an outgoing unit. It can connect and disconnect circuits normally and provide protection against short circuits, overloads, and leakage. It should include circuit breakers, leakage protection switches, dual power switches, AC contactors, surge protectors, voltage meters, current meters, thermal relays, intermediate relays, time relays, fuses, buttons, indicator lights, indicators, and terminal connections. The sub-distribution box consists of an incoming unit and several outgoing units, equipped with a circuit breaker for the main switch and circuit breakers for individual circuits. It should include circuit breakers, among other components. The switch box consists of an incoming unit and an outgoing unit, equipped with circuit breakers and leakage protection switches. It should include circuit breakers and leakage protection switches.

Main Components Of A Distribution System

  • Circuit Breaker: Also known as a switch, it is the main component of a distribution cabinet. It is responsible for connecting, disconnecting, and carrying rated operating currents, as well as protecting against faults such as short circuits and overloads. It can quickly disconnect the circuit in the event of overload, short circuit, undervoltage, etc., to provide reliable protection.

  • Leakage Protection Switch: It has the function of leakage protection. Its main function is to trip when people come into contact with charged objects, ensuring personal safety. It also provides functions such as current interruption, overload protection, and short circuit protection.

  • Dual Power Switch: It automatically switches to another power source in the event of a power failure. It is suitable for uninterrupted power transfer between any two power sources, such as UPS-UPS, UPS-generator, UPS-main power, and main power-main power.

  • AC Contactor: AC contactors are commonly used to start equipment. Different control wiring methods can be used to control the forward and reverse rotation and start/stop of motors. They can also be used for remote control by adjusting the length of control cables, and different connections can enable multi-point control.

  • Surge Protector: Also known as lightning protection devices, surge protectors are electronic devices that provide safety protection for electronic equipment, instruments, and communication lines. When a circuit or communication line suddenly experiences peak currents or voltages due to external interference, the surge protector quickly diverts the surge current to prevent damage to other devices in the circuit.

  • Electric Energy Meter: It is used to measure electrical energy consumption and is commonly known as an electricity meter. Electronic energy meters use dedicated integrated circuits to transform voltage signals into small signals suitable for electronic measurements using voltage dividers or voltage transformers. They also transform current signals into small signals suitable for electronic measurements using current transformers or current dividers. A dedicated energy measurement chip performs analog or digital multiplication on the transformed voltage and current signals, accumulates electrical energy, and outputs pulse signals with a frequency proportional to the energy. These pulse signals are displayed by a meter or a digital display.

  • Voltage Meter: An instrument used to measure voltage. The symbol for a voltmeter is "V." High-sensitivity ammeters contain permanent magnets. The coil, formed by connecting the ends of the ammeter in series with the connecting wire, is placed in the magnetic field of the permanent magnet. The coil is connected to the transmission device, which is connected to the pointer of the instrument.

  • Current Meter: An instrument used to measure electric current. The symbol for an ammeter is "A." An ammeter is based on the interaction between the conductor and the magnetic field. When current flows through the conductor, the current passes through the spring and the rotating axis in the magnetic field, cutting off the magnetic induction lines. As a result, the coil is deflected due to the magnetic field's force, driving the rotating axis and deflecting the pointer.

  • Thermal Relay: A thermal relay is a protective device used for overload protection of motors or other electrical equipment and circuits. It generates heat by passing current through a thermal element, causing deformation of bimetallic strips with different coefficients of expansion. When the deformation reaches a certain distance, the connecting rod is pushed, causing the control circuit to disconnect, resulting in the loss of power to the contactor and the disconnection of the main circuit, thus achieving overload protection for the motor.

  • Intermediate Relay: Intermediate relays are usually used to transmit signals and control multiple circuits simultaneously. They can also be used to directly control small-capacity motors or other electrical actuators.

  • Time Relay: A time relay is a type of relay that produces a jump-like change (or contact action) in its output circuit after a specified and accurate time period has passed since the addition or removal of an input actuation signal. It is used in circuits with lower voltage or smaller current to connect or disconnect circuits with higher voltage or larger current.

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