Introduction to the low-voltage chamber cabinet in the power system
1.Transformer.
Change the voltage level from 10kV to 400V for back-end loads.
Transformer role.
It is a kind of static electrical appliance that converts alternating current energy of one voltage level into alternating current energy of another voltage level of the same frequency through electromagnetic induction between coils.
Transformer principle.
It is a device that converts AC voltage, current and impedance, and when there is AC current in the primary coil, AC magnetic flux is generated in the iron core (or core), so that the voltage (or current) is induced in the secondary coil
A coil connected to a power source that receives alternating current energy is called a primary winding.
The coil connected to the load sends alternating current energy, which is called a secondary winding.
2.Low-voltage incoming wire.
After the transformer outputs electric energy, the electric energy is distributed after the low-voltage inlet switch, and the low-voltage inlet switch plays the role of disconnecting the electrical connection between the load and the transformer, and has the function of electrical protection, which can be broken in time when there is a short circuit and overload at the back end, so as to protect the superior equipment and the back-end equipment.
The low-voltage cable entry cabinet has the following main functions and features:
Power reception: The low-voltage incoming cabinet receives the incoming low-voltage power from the power company or transformer. These power incoming wires are usually connected to the trunk bus of the inlet cabinet by cable or wire.
Power distribution: There are multiple branch circuits or switching units inside the low-voltage inlet cabinet for distributing power from the backbone bus to different circuits and load equipment. These branch circuits can be flexibly configured and adjusted according to demand.
Overload and short-circuit protection: Low-voltage inlet cabinets are usually equipped with overload protection devices (such as air circuit breakers or fuses) and short-circuit protection devices to monitor and protect individual circuits from overload currents and short-circuit faults.
Measurement and monitoring: Low-voltage inlet cabinets may also be equipped with energy meters and monitoring devices to measure and monitor parameters such as power consumption, voltage, current, and power factor for different circuits. This data can be used for power management, energy monitoring, and fault diagnosis.
Safety & Protection: Low-voltage cable entry cabinets are equipped with suitable insulation materials and safety measures to ensure the safety of operators and equipment. They are typically designed with reliable construction and protection against unexpected situations such as electric shock, overheating, and fire.
3.Reactive power compensation.
The full name of reactive power compensation is a kind of power supply system to improve the power factor of the power grid, reduce the loss of power supply transformer and transmission line, improve power supply efficiency, and improve the power supply environment.
The main advantages of the reactive power compensation cabinet include:
1. Improve the power factor: Through reactive power compensation, the power factor of the power system can be increased to the ideal range and reduce the energy waste caused by reactive power.
2. Reduce the load of the power grid: the reactive power compensation cabinet can reduce the load of the power grid and improve the transmission capacity of the power grid.
3. Improve voltage stability: Through reactive power compensation, the voltage of the power system can be adjusted and the voltage stability of the system can be improved.
4. Reduce line loss: The reactive power compensation cabinet can reduce the reactive power loss on the power line and improve the transmission efficiency.
4.Contact. The bus tie switch cabinet connects the output of the two transformers, and controls it through the bus tie switch, so that the other transformer can bear all the load at the back end of the two transformers when any transformer fails, so as to improve the reliability of power supply.
The bus tie switch cabinet has the following main functions and features:
Bus segmentation: Through the bus tie switchgear, the bus bar in the power system can be divided into different sections, so that when a certain section needs to be maintained or overhauled, the section can be disconnected independently without affecting the normal operation of other sections.
Control and protection: The bus tie switch cabinet is equipped with control and protection devices, such as circuit breakers and protection relays, which are used to monitor and control the current, voltage and temperature and other parameters of the bus section, and carry out protection actions in the event of faults or abnormal conditions.
Flexible connection: The bus tie breaker can be directly connected to other power distribution equipment, such as transformers, generators and loads. They provide flexible connectivity options that make it easier to lay out and adjust the power system.
Safety: The bus tie breaker cabinet is designed with suitable insulation materials to ensure safe operation in normal operation and failure situations. They are equipped with fire, explosion and protective measures to protect the safety of operators and equipment.
5.Feeder cabinets.
The power output of the transformer is distributed to the distribution cabinets with different loads at the back end.
The feeder cabinet has the following main functions and features:
Feeder distribution: Feeder cabinets distribute power to different feeders or loads by connecting to a power source. They typically have multiple switching units or circuit breakers to control and segment different feeders.
Overload protection: The feeder cabinet is equipped with an overload protection device, such as a fuse or circuit breaker, to monitor and protect the feeder from damage from overload current. When the current exceeds the set rated value, the protection device will disconnect the circuit to protect the safety of the line and equipment.
Short-circuit protection: The feeder cabinet also has short-circuit protection to prevent short-circuit faults in the power system. Short-circuit protection devices are able to detect short-circuit currents and quickly cut off faulty circuits to reduce damage and safety risks in the power system.
Control and monitoring: The feeder cabinet can be equipped with control and monitoring devices, such as contactors, relays and meters. These devices are used to control the switching operation of feeders, monitor parameters such as current, voltage, and power, and provide the necessary information for operation and maintenance of the power system.
Safety and reliability: Feeder cabinets are insulated with suitable materials and designs to ensure safe operation in both normal operation and fault situations. They are equipped with fire, explosion and protective measures to protect the safety of operators and equipment. In addition, feeder cabinets are designed and manufactured following relevant electrical standards and specifications to ensure their reliability and performance.