GGJ Reactive Power Compensation Cabinet

Many factories have encountered such situations: even though the transformer capacity was not exceeded, they were still fined by the power supply station for reactive power? The reactive power charges listed on the electricity bill often amount to several thousand or tens of thousands of yuan? The GGJ Reactive Power Compensation Cabinet is a factory-specific energy-saving compensation device specifically designed to solve this problem. It can automatically compensate for the reactive power in the power distribution system, increasing the power factor from below 0.8 directly to above 0.95. This not only completely eliminates the reactive power fines but also reduces line losses and improves the load rate of the transformer, helping the factory save a significant amount of electricity costs. Moreover, it enables the factory to expand production capacity without having to replace the transformer. Therefore, we recommend that users give priority to using dynamic reactive power compensation devices in the following scenarios.

Core advantages

Save electricity and reduce losses. GGJ Reactive Power Compensation Cabinet can lower the reactive power loss of the lines by 5% to 10%, which can save several thousand or even tens of thousands of yuan in electricity costs for high-energy-consuming factories. Over the course of a year, the savings can be significant, with long-term benefits being extremely high.

Increase transformer load rate. After compensation, the active load of the transformer can increase by more than 20%. For example, a 1000kva transformer that could only handle 800kw of load before, can now handle 950kw. Without replacing the transformer, production can be expanded, saving a large amount of capacity expansion fees.

Suppress harmonics. The series reactor provided by the protection equipment can effectively suppress harmonics in the power grid, preventing capacitor overload and equipment damage caused by harmonics. It protects the precision equipment and frequency converters at the back end, extending the service life of the equipment.

Intelligent dynamic compensation. The intelligent switching module can automatically adjust the compensation capacity according to changes in load. Whether it is light load or heavy load, it can precisely compensate without over-compensation or under-compensation, and is suitable for the fluctuating loads of factories.

Technical Specifications

Product Features

◇ GGJ Reactive Power Compensation Cabinet has strong versatility. The Low-Voltage Switchgear can be combined with various cabinet types from both domestic and foreign manufacturers, such as MNS GGK, GGD, etc.;

◇ The capacitor compensation combination methods are diverse and flexible. It includes Y-type compensation method, △-type compensation method, and Y+△ combined compensation method;

◇ The communication methods are diverse. It has RS -232/485 communication interfaces, wireless data transmission module or GPRS module for long-distance communication;

◇ The control is accurate and safe. It implements zero-voltage triggering, no surge current during startup, and no high voltage during disconnection;

◇ The service life is long. Under maintenance-free conditions, the service life can exceed 100,000 hours.

Details of GGJ Reactive Power Compensation Cabinet

Self-healing Low-Voltage Capacitor: High-quality self-healing capacitor with low loss and long lifespan, automatically isolating faults

Series Reactor: Suppressing harmonics, preventing capacitor overload, protecting the power grid and equipment

Intelligent Switching Module: Zero-crossing switching, no surge current, protecting the capacitor and the power grid, fast response

Standard Wiring Process: Separation of power and signal lines, horizontal and vertical wiring, convenient maintenance, safety and standard

Heat Dissipation and Ventilation Design: Special heat dissipation channels, quickly removing operating heat, ensuring stable operation of the capacitor

What are the application scenarios of GGJ Reactive Power Compensation Cabinet?

High-energy-consuming factories: Factories with high energy consumption such as hardware, injection molding, and textiles, to solve the problem of reactive power penalties

Large production lines: Production lines with a large number of motors and welding machines, to compensate for reactive power and reduce losses

Commercial complexes: Power distribution rooms of large shopping malls and hotels, to improve power factor and save electricity costs

Park power distribution: Power distribution compensation in industrial parks and development zones, to optimize power supply quality

Renovation of old factory areas: Power distribution renovation in old factory areas, to solve the problem of unmet power factor requirements

Project Transformation Sharing

Project Overview

This project is a power distribution renovation project for the mechanical manufacturing workshop in the industrial park. The main transformer capacity of the factory area is 1600 kVA. The workshop's load mainly consists of a large number of three-phase asynchronous motors, fans, water pumps, and mechanical equipment, which is a typical large inductive load. The equipment operates under light load or no-load conditions for a long time, resulting in extremely high reactive power loss in the system, a low power factor of the grid, and a large amount of penalty fees for power factor.

The original power distribution system did not have dedicated centralized compensation equipment and relied only on a small amount of decentralized compensation, with low compensation accuracy and chaotic switching. To address the issues of insufficient power factor, high line loss, and penalties from the power bureau, this project added a GGJ type low-voltage reactive power automatic compensation capacitor cabinet on the busbar side of the low-voltage distribution room to achieve dynamic automatic switching, stable reactive power, energy conservation, and loss reduction.

Problems before renovation

Power factor severely failed to meet standards: The overall power factor of the factory area was only 0.70–0.73, lower than the 0.9 standard set by the power supply bureau, resulting in high monthly force adjustment fines.

High line loss and voltage drop: Large reactive current led to severe heating of transformers and cables, and the voltage at the end of the line was too low.

Low transformer utilization rate: A large amount of reactive power occupied the transformer capacity, preventing the increase of active load and limiting the equipment's load-bearing capacity.

No automatic compensation function: The old manual compensation was lagging behind, unable to follow real-time changes in load, and excessive or insufficient compensation occurred frequently.

High electricity cost: Long-term waste of reactive power, high comprehensive electricity price cost, and poor economic efficiency of enterprise electricity usage.

Equipment Configuration Plan

Based on the load characteristics of the factory area and the reactive power gap, a GGJ low-voltage reactive power automatic compensation cabinet is configured on the 0.4kV low-voltage busbar. It adopts an intelligent dynamic cyclic switching mode, suitable for the working conditions where workshop motors frequently start and stop and the load fluctuates greatly.

Core equipment parameters

Equipment model: GGJ Low-Voltage Reactive Power Automatic Compensation Cabinet

Applicable system: 0.4kV/50Hz three-phase low-voltage power distribution system

Compensation capacity: Total compensation capacity of 480 kvar, grouped and step-by-step switching

Control method: Intelligent reactive power compensation controller, real-time sampling of voltage and current, dynamic cycle switching

Capacitor configuration: Self-healing low-voltage parallel capacitors, with overheat, overvoltage, and discharge protection

Switching elements: Composite switch switching, no inrush current, no impact, no damage to capacitors

Protection functions: Short circuit, overload, overvoltage, undervoltage, phase loss automatic protection

Cabinet structure: Standard GGJ enclosed cabinet, dust-proof, rust-proof, suitable for industrial workshop environment

Key Features of the Transformation Application

Dynamic and Precise Compensation: Automatically adjusts the compensation capacity based on the load size in the workshop. Less compensation is provided for light loads and more compensation is provided for heavy loads, eliminating the problems of under-compensation and over-compensation.

No Impact Switching: The composite switch operates with zero inrush current, protecting the capacitors and the power grid, and prolonging the service life of the equipment.

Comprehensive Protection Functions: Multiple electrical protections are available, effectively resisting grid fluctuations and load shocks, ensuring high operational stability.

Installation and Transformation Convenience: Simply connect to the low-voltage busbar directly, without needing to modify the original main cabinet structure. The construction period is short and the commissioning is fast.

No Daily Maintenance Required: The self-healing capacitors have a low failure rate and operate automatically, eliminating the need for frequent manual operations.

The operational effect after renovation

Complete elimination of electricity penalty charges: The system's power factor has been steadily increased to above 0.95, fully meeting the assessment standards of the power supply bureau, and all power factor electricity penalty charges have been waived.

Significant reduction in power loss and energy conservation: Reactive current has been greatly reduced, the temperature rise of transformers and cables has decreased significantly, and line losses have been reduced by more than 12%.

Voltage quality improvement: The terminal voltage is stable, solving the problems of low-voltage operation of equipment and insufficient power supply, making the operation of mechanical equipment more stable.

Increase in transformer capacity utilization rate: Reducing the occupation of reactive capacity, the transformer can carry more active load, and production needs can be met without expansion. Equipment lifespan extension: Stable grid current and reduced heating, the aging speed of distribution equipment and motors decreases, and operation and maintenance costs decrease.

Case Summary

The GGJ reactive power compensation cabinet is a standard energy-saving distribution equipment applicable to industrial plants, manufacturing industries, supermarkets, residential areas, and pumping stations. For scenarios with a large number of inductive loads, low power factor, and severe electricity bill penalties, it can achieve automatic and dynamic reactive power compensation, stabilizing grid quality, reducing line losses, saving electricity costs, and increasing equipment utilization rate. It is an essential energy-saving accessory cabinet type for low-voltage distribution projects.