High Voltage Automatic Reactive Power Compensation Complete Set Device

Structural Characteristics

High voltage automatic tuning filter cabinets are mostly cabinet or frame structures

When using a cabinet structure, multiple cabinets are assembled and arranged in sequence. The entire cabinet is made of high-quality cold-rolled steel plates that are bent and welded, or from aluminum-zinc-coated steel plates that are bent and assembled. It features single or double doors at the front and rear, with top, bottom, and side panels, and is equipped with ventilation and heat dissipation windows. An instrument compartment is located at the top of the cabinet to house the relay protection devices for this unit.

When it is a frame structure, it consists of an incoming isolation switch gantry, a lightning arrester bracket, a capacitor group framework, and a series reactor. The entire assembly is enclosed by a steel mesh fence.

This type utilizes vacuum contactors or vacuum circuit breakers in conjunction with an automatic voltage and reactive power control unit to automatically switch and control capacitor banks. It is a new type of system designed to automatically regulate busbar voltage, compensate for reactive power, and improve voltage compliance rates and power factor. It is characterized by its safety, reliability, convenience, and flexibility, as well as its ability to fully utilize capacitor capacity and enhance operational efficiency.

This device can be configured to either switch the entire bank automatically based on the total reactive power required, or divided into several sub-units of equal or unequal capacity as needed. The automatic switching system monitors grid voltage and reactive power to achieve automatic capacitor switching through appropriate control and protection mechanisms.

This device is suitable for substations at 220 kV and below in power plants, electric power bureaus, and large industrial and mining enterprises. The 6–10 kV power supply systems. Its framework structure is widely applied in 6–66 kV power supply systems for automatic reactive power compensation and control. The switching function of capacitors is used to achieve the user-set target COSφ or Qc values, ensuring that system voltage and reactive power are automatically maintained in an optimal state.

The automation level of device can be combined with comprehensive substation monitoring systems to enable unmanned reactive power compensation, ensuring high reliability. The device uses a single shunt capacitor as its primary component and is equipped with a fuse for capacitor protection, a discharge coil, zinc oxide surge arresters, and CKSG dry-type series reactors (which may also be installed externally), as well as reliable vacuum contactors, vacuum circuit breakers, or sulfur hexafluoride (SF6) circuit breakers—which feature no re-ignition and no bounce—as automatic switching equipment for the shunt capacitor banks. The connecting busbar is made of copper busbar with tin crossing.

Functional Features

1.1 Combing parallel capacitor groups with equal or unequal capacities, the system enables flexible automatic control of reactive power and reasonable compensation

1.2 The system features a simple structure and compact design, with one control unit per bank. It can be divided into up to 12 units, modular combination structure, compensation capacitor can be large and small, beautiful appearance, convenient and flexible selection, and low investment.

1.3 High capacitor utilization is achieved through automatic group switching;

1.4 The frame structure is widely suitable for outdoor use, supports large installed capacities, and requires no dedicated building;

1.5 The automatic reactive power switching device can be located in the central control room; cabinet-type devices can also be installed within the main power input cabinet of the system, working in conjunction with upstream switch gear to provide comprehensive protection and control functions with a high degree of automation;

1.6 It supports both automatic and manual operation, offering flexible operation, simple control, and high safety and reliability.

1.7 It features RS232 or RS485 serial communication interfaces, allowing it to be networked with other monitoring equipment within the substation to form an integrated substation automation system, meeting the requirements of various operational management modes such as unmanned or minimally staffed substations and centralized control.

1.8 Equipment with over-temperature and over-voltage protection alarms, and internal and external fault interlock functions;

1.9 Equipment with protective performance for incoming line isolation and grounding interlocks; when the device is out of service, the neutral point and phase lines can be simultaneously grounded; it also provides robust five-prevention interlock protection.

Environmental Conditions For Use

• Cabinet style indoor use, frame style outdoor use;

• Altitude not exceeding 1000m; (Additional requirements for elevations exceeding 1000m)

• A place with no corrosive gases, water vapor or other serious pollution in the surrounding air, no flammable gases, no fire or explosion hazards.

• The ambient air temperature is -25-+40 ° C, with good indoor ventilation and heat dissipation;

• Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;

• Places without frequent and severe vibrations;

• The network or bus voltage power supply side connected to the installation site should have no significant waveform distortion, and should not be affected by high-order harmonic sources The voltage waveform distortion rate and harmonic content should not exceed the provisions of GB/14549-93 “Voltage Quality, Harmonics of Public Power Grids".

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