Solutions-GoLead Intelligent

Background and Challenges

As the "cornerstone" of national energy security, the coal industry faces critical challenges related to power system stability, frequent equipment start-stop operations, adaptation to high-dust environments, and impacts from nonlinear loads, including:

High Demand for Continuous Power Supply

Key underground equipment such as main ventilation fans and drainage pumps must operate continuously 24/7. Power grid disturbances or outages may lead to serious safety hazards, including gas accumulation and water inrush incidents.
Frequent Start-Stop Equipment Losses

Under modern power systems, coal-fired units are increasingly required to perform flexible peak regulation, resulting in a sharp rise in start-stop cycles—over 30 times per year for some units—accelerating equipment aging and increasing maintenance costs.
Nonlinear Load Impacts

Energization of transformers, long-distance cables, and variable frequency drives (VFDs) can generate magnetizing inrush currents and overvoltages, potentially causing protection malfunctions or insulation damage to equipment.

Overview

Tailored to the specific characteristics of the coal mining and coking industries, this solution integrates seamless fast transfer devices, intelligent phase-controlled circuit breakers, and inrush current suppressors to build a power system featuring millisecond-level power continuity and intelligent power quality management.

Through a fast seamless transfer system (≤20 ms), continuous operation of critical loads is ensured; advanced inrush suppression technology effectively reduces switching impacts on equipment; and the integration of primary and secondary equipment enables remote monitoring and energy efficiency optimization. The solution is well suited for applications such as underground high-voltage power distribution and coking production lines, meeting requirements for high reliability, high safety, and low energy loss.

Key Technologies

Power Supply Continuity Assurance

The solution ensures uninterrupted power supply by coordinating seamless fast transfer devices with high-speed vacuum circuit breakers. In the event of a main power failure, transfer logic is initiated within milliseconds, and breaker opening and closing actions are completed within a total time of ≤20 ms, enabling zero-flicker power continuity for critical loads such as mine ventilation systems and coke oven blowers—significantly outperforming the industry’s average switching time. In addition, automatic synchronization systems are applied to captive power plants and waste-heat generation units, supporting high-precision grid connection with extremely tight frequency and phase-angle tolerances, effectively reducing synchronization impact and extending generator service life.
Power Quality Management

To address power quality challenges in coal and coking applications, the solution incorporates microprocessor-based inrush current suppressors and phase-selection control devices. Driven by proprietary residual flux algorithms, the inrush suppression system limits transformer and long-distance cable energization currents to well below conventional levels, significantly reducing the risk of damage to sensitive equipment such as VFDs and PLCs. At the same time, optimized phase-angle control during breaker operation minimizes arc restrike probability and suppresses switching overvoltage, effectively protecting insulation systems of underground high-voltage motors and improving overall system reliability.
Environmental Adaptability and Smart Operation & Maintenance

Designed for harsh industrial environments, smart phase-controlled circuit breakers precisely control closing and opening actions at voltage and current zero-crossing points, dramatically reducing inrush currents, arcing energy, and overvoltage levels. The equipment is capable of stable operation across extreme temperature ranges and integrates built-in sensors for real-time monitoring of thermal and mechanical conditions, enabling fault early warning. Through primary–secondary integration and standardized communication protocols, the system connects seamlessly with plant SCADA platforms, providing centralized monitoring of equipment status and energy consumption while supporting load optimization and intelligent operation and maintenance.

Application Results and Cases

In a large coal mine project in Guizhou Province, GoLead Intelligent actively responded to the special directives of the National Mine Safety Administration and delivered a customized integrated solution featuring dual power supply configuration and automatic seamless backup power transfer.

The solution ensured uninterrupted operation of critical equipment such as main ventilation fans during sudden power disturbances (e.g., voltage sags or flicker), effectively preventing potential risks of excessive underground gas concentration and establishing a robust safety barrier for coal mine production. As a result, safety hazards associated with power interruptions were comprehensively eliminated. In addition, by avoiding power losses caused by supply interruptions, the solution reduced on-site maintenance costs by 30% during actual operation.

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