TBBZ Automatic Reactive Power Compensation Device

Junray Electrical TBBZ Automatic Reactive Power Compensation Device is a high-voltage-side reactive power compensation solution specifically designed for 10kV and 35kV power distribution systems. Unlike low-voltage compensation cabinets that only address terminal-side reactive power, the TBBZ compensates directly at the high-voltage busbar, eliminating reactive power losses in main transformers and high-voltage lines at the source. It stabilizes the high-voltage power factor above 0.95, completely eliminating utility penalties for poor power factor. Rated compensation capacity ranges from 100kvar to 5000kvar, featuring intelligent automatic switching, multi-stage grouped switching, series reactor harmonic suppression, and dry-type explosion-proof capacitor units. Suitable for large industrial plants, smelting facilities, mining operations, chemical plants, high-voltage substations, and mega data centers with high-impact, fluctuating high-voltage loads.

What are our advantages compared to similar products?

High-voltage-side compensation: Compensation is directly carried out on the high-voltage side, which is more effective than compensation on the low-voltage side. It can directly solve the power factor problem on the high-voltage side and completely eliminate the reactive power penalty on the high-voltage side. There is no need to worry about the power factor of the high-voltage side anymore.

Intelligent automatic switching: The intelligent automatic switching module can automatically adjust the compensation capacity according to the changes in high-voltage load. Whether it is light load or heavy load, it can precisely compensate without over-compensation or under-compensation. It is suitable for fluctuating high-voltage loads.

Completely avoid high-voltage reactive power penalties: Automatically stabilize the power factor on the high-voltage side above 0.95, perfectly meeting the assessment standards of the power supply department. No longer need to pay high-voltage power factor adjustment penalties. Many large factories have saved their equipment costs within the first month after installing this device.

Suppress harmonic protection equipment: The accompanying series reactor can effectively suppress the harmonics on the high-voltage side, avoiding capacitor overload and equipment damage caused by harmonics. Protecting the high-voltage equipment at the back end and extending the service life of TBBZ Automatic Reactive Power Compensation Device.

Technical Specifications

TBBZ Automatic Reactive Power Compensation Device Detailed Description

1. High-voltage self-healing capacitor: A dedicated self-healing capacitor for high-voltage applications, with low loss, long lifespan, and automatic fault isolation.

2. Intelligent automatic switching: An intelligent switching module that automatically adjusts the compensation capacity and precisely compensates.

3. Series reactor: Suppresses high-voltage harmonics, prevents capacitor overload, and protects the power grid and equipment.

4. Five-prevention interlock protection: Five-prevention interlock for high-voltage, preventing misoperation and ensuring operational safety.

5. Heat dissipation and ventilation design: Special heat dissipation channels to quickly remove operating heat, ensuring stable operation of the capacitor.

Applicable scenarios

Large factories: High-voltage reactive power compensation for large factories to address high-voltage reactive power penalties

High-voltage substations: High-voltage reactive power compensation for substations to optimize grid quality

Super-large data centers: High-voltage reactive power compensation for super-large data centers

Large infrastructure projects: High-voltage reactive power compensation for large infrastructure projects

High-voltage factories: Ultra-large factories requiring high-voltage reactive power compensation

Quality Assurance

The TBBZ Automatic Reactive Power Compensation Device is strictly manufactured in accordance with the national standards for TBBZ high-voltage reactive power compensation devices. Each device undergoes power-on debugging, compensation accuracy testing, and withstand voltage testing to ensure that the compensation effect meets the standards. It supports capacity customization and function customization. You can customize an exclusive compensation plan based on the capacity of your high-voltage transformer and the load conditions.

Retrofit Project Overview

I. Project Profile

This project involves the 10kV high-voltage power distribution system retrofit for a large-scale non-ferrous metal smelting and processing plant. The facility's core loads—comprising submerged arc furnaces, large variable-frequency fans, and crushing/smelting equipment—are characterized as typical high-impact, highly inductive loads that operate continuously (24/7) with frequent load fluctuations.

Previously, the plant relied solely on low-voltage GGJ compensation cabinets. Due to limited low-voltage compensation capacity, the system could not offset the substantial reactive power losses on the high-voltage side. This resulted in a consistently low power factor at the high-voltage incoming line, high line losses, and significant monthly utility penalties for poor power factor. Additionally, the system suffered from severe busbar voltage fluctuations and excessive equipment temperature rise. The retrofit involved installing a TBBZ high-voltage automatic reactive power compensation device on the 10kV busbar to achieve centralized dynamic compensation, stabilize voltage, reduce losses, and eliminate utility penalties.

II. Issues Prior to Retrofit

High-voltage power factor significantly below standards: Due to heavy smelting impact loads, low-voltage compensation alone was insufficient to bridge the system's reactive power gap. The high-voltage power factor consistently ranged from 0.75 to 0.82—falling well below the State Grid's 0.9 assessment standard—resulting in heavy penalties.

Excessive high-voltage line losses: Large amounts of reactive current flowing through high-voltage busbars, cables, and main transformers caused equipment overheating and persistently high line losses.

Severe busbar voltage fluctuations: Frequent starting and stopping of submerged arc furnaces caused volatile voltage levels, disrupting the operating conditions of precision smelting equipment and reducing product pass rates.

Limitations of low-voltage compensation: GGJ low-voltage compensation units could only address reactive power at the terminal level; they failed to reduce reactive power losses in the main transformers and on the high-voltage side, resulting in limited energy-saving benefits.

Low transformer utilization: Reactive power demand consumed a large portion of the main transformer's capacity, preventing the facility from increasing active power load and operating at full production capacity. III. Equipment Configuration Plan

Based on the reactive power deficit and impulse load characteristics of the plant's 10kV high-voltage system, a TBBZ-10kV high-voltage automatic grouped reactive power compensation unit is installed on each of the two busbar sections in the high-voltage distribution room. These units utilize a multi-stage grouped switching mode to accommodate the significant load fluctuations inherent in smelting operations.

Core Equipment Specifications

Model: TBBZ10-1800kvar High-Voltage Automatic Reactive Power Compensation Unit

Compatible System: 10kV high-voltage AC distribution system

Total Compensation Capacity: 1800kvar per section; divided into 3 groups for staged switching (600kvar per group)

Switching Components: High-voltage vacuum contactors; feature zero inrush current and zero overvoltage; suitable for frequent switching

Control Method: Intelligent reactive power controller; dynamic automatic switching based on three parameters: power factor, voltage, and reactive power

Protection Configuration: Overvoltage, undervoltage, overcurrent, short-circuit, zero-sequence, capacitor breakdown, and loss-of-voltage protection

Capacitor Configuration: High-voltage dry-type self-healing capacitors; explosion-proof, flame-retardant, oil-free, and highly safe

Series Reactor: Equipped with a 5% series reactor to suppress harmonics, prevent switching resonance, and protect capacitor equipment

IV. Retrofit Highlights

Centralized High-Voltage Compensation for Thorough Loss Reduction: Compensation is applied directly at the 10kV busbar side, reducing reactive power losses in main transformers, high-voltage cables, and switchgear at the source; energy-saving results far exceed those of low-voltage compensation.

Precision Multi-Stage Grouped Switching: Multi-group staged switching (fewer groups engaged during light loads, more during heavy loads) eliminates over-compensation and under-compensation, effectively handling the drastic load fluctuations of smelting processes.

Harmonic Suppression and Resonance Prevention: Dedicated series reactors effectively suppress harmonic currents generated by smelting equipment, prevent system resonance, and ensure the safety of high-voltage equipment.

Safe and Reliable Dry-Type Explosion-Proof Design: High-voltage dry-type capacitor units are oil-free, non-flammable, and explosion-proof, eliminating risks such as oil leakage, fire, or explosion, making them suitable for high-risk industrial workshops. Fully automated and unattended operation: Features real-time sampling and dynamic adjustment without the need for manual intervention; provides 24-hour automatic voltage stabilization and power factor control, making operation and maintenance extremely simple.

V. Operational Results After Retrofitting

Elimination of power factor penalties: The high-side power factor is stably maintained between 0.95 and 0.98, fully meeting State Grid assessment standards for high-voltage users; penalties are eliminated, and power factor bonuses are secured.

Significant reduction in high-voltage losses: Reactive current in main transformers and high-voltage lines is markedly reduced; combined transformer and line losses drop by over 15%, resulting in substantial monthly electricity savings.

Stable and balanced busbar voltage: Effectively suppresses voltage fluctuations caused by load surges; high-voltage busbar voltage remains stable within the standard range, significantly improving the operating conditions of smelting equipment.

Enhanced main transformer load-carrying capacity: Frees up transformer capacity previously occupied by reactive power, allowing for increased active load and fully unleashing the factory's production capacity.

Extended lifespan of high-voltage equipment: Equipment temperature rise remains normal and free from frequent voltage surges, significantly slowing the aging process of high-voltage switchgear and transformers.

VI. Case Summary

The TBBZ high-voltage automatic reactive power compensation device is specialized energy-saving equipment designed for 10kV/35kV main step-down substations serving large industrial complexes, smelting plants, mines, chemical facilities, and factories. Unlike low-voltage GGJ compensation cabinets, it directly addresses high-side reactive power losses, stabilizes high-voltage levels, and resolves issues associated with low power factors caused by high-power surge loads. It serves as a core integrated solution for loss reduction, energy conservation, compliance certification, and efficiency enhancement in high-voltage power distribution projects.