GGJ Automatic Reactive Power Compensation Device LV Panel

The GGJ Automatic Reactive Power Compensation Device LV Panel is an intelligent power distribution device manufactured by Cotenele. This low-voltage switchgear improves the power factor in 380V low-voltage grids by automatically switching capacitors.

Its microcomputer controller tracks reactive power in real time and achieves stable compensation above 0.95, with a response time as fast as 20 ms. The cabinet provides multiple protection functions and supports communication for power monitoring.

This low-voltage electrical cabinet is widely used in industrial plants, buildings, and municipal facilities, and is suitable for transformers ranging from 130 to 600 kVA.

The GGJ Automatic Reactive Power Compensation Device complies with national and international standards including GB/T 15576, GB 7251.1, and IEC 60439-1, ensuring safety and reliability as a modern energy-saving solution.

Model and Meanings

Main technical parameters

Product Features

• Adopts an intelligent controller for control, featuring complete functions and reliable performance. The compensation mode is automatic and can raise the power factor to above 0.9.

• Real-time display of grid power factor:

• Lagging (0.00–0.99)

• Leading (0.00–0.99)

• Provides multiple protection functions including over-voltage, over-harmonic, over-compensation, system fault, phase loss, and overload protection.

• Memorizes set parameters; parameters are not lost during a power outage. When the grid returns to normal, the device automatically resumes operation without manual intervention.

• Capable of split-phase compensation or hybrid compensation based on the load balance condition of the grid.

• Strong anti-interference capability; can withstand interference pulses with an amplitude of 2000V directly from the grid, exceeding national professional standards.

Optional Power Distribution Network Monitoring Function

• Real-time measurement and hourly recording of three-phase voltage, current, frequency, active power, reactive power, power factor, active energy, and reactive energy on the low-voltage side of the transformer.

• Total harmonic distortion (THD) of voltage and current, as well as individual harmonic contents from the 2nd to the 25th order.

• Equipped with RS-232 and RS-485 interfaces, supporting data reading via PDA, as well as remote communication for wireless meter reading, device testing, parameter setting, and retrieval of real-time and recorded data.

• Data analysis functions include operating load analysis, statistical queries, comprehensive evaluation of power supply quality, calculation of voltage qualification rate, power supply load rate, reliability rate, and maximum load rate, as well as queries of power factor, active power, and reactive power by time period. The system can also generate curves of phase voltage, current, and power factor, and print comprehensive analysis and statistical reports.

Product Structures and Main Components

The GGJ Automatic Reactive Power Compensation Device LV Panel is made of high-quality cold-rolled steel plate with a closed structure and anti-corrosion spray coating. Its core components include:

Intelligent reactive power controller: This component is the "brain" of the compensation device, monitoring reactive power and power factor in real time and issuing switching commands.

Power capacitors: core compensation elements that generate reactive power. Modern designs mainly use dry-type self-healing capacitors, which outperform traditional oil-filled types.

Switching devices: execute controller commands to switch capacitors in/out.

Common types: capacitor contactors and thyristor fast no‑switching switches.

Disconnect switch / fuses: provide main power on/off and short-circuit protection.

Thermal overload relay:provides overload protection for capacitors.

Display instruments: panel usually includes power factor meter, ammeter, voltmeter for real-time monitoring.

Working Principle

The controller inside the cabinet continuously monitors the voltage and current signals of the grid, calculating reactive power and power factor in real time.

When the power factor falls below a preset target value (for example, 0.95), the controller automatically switches one or more capacitor banks through the switching devices.

Because capacitor current leads voltage, the capacitive reactive current offsets the lagging reactive current of inductive loads, thereby raising the grid power factor to the target value and achieving local reactive power balance.

This closed-loop automatic control process ensures that the GGJ cabinet accurately tracks load changes while avoiding both over-compensation and under-compensation, keeping the grid in an efficient operating state.

Outdoor pole-mounted installation method

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