Solutions-GoLead Intelligent

Background and Challenges

Substation

High Inrush Current During Switching

Reactive power compensation devices such as capacitors and reactors generate high-magnitude magnetizing inrush current during frequent switching operations, posing risks to grid stability.
Fast Response Required on High-Voltage Side Switching

When faults occur in the main transformer or supply lines, the power supply system must support millisecond-level switching to ensure uninterrupted power to critical loads.
High Requirements for Impact Resistance and Aging Tolerance

Devices are expected to operate long-term in high-voltage, heavy-load, and high-electromagnetic-interference environments, demanding superior performance stability and precise protection capabilities.

Overview

Leveraging its core technological strengths in intelligent phase-controlled circuit breakers and power transfer switching devices, our company offers an integrated power system solution featuring “Accurate Phase Control + Millisecond-Level Transfer + Intelligent Protection.” This solution is comprehensively applicable in substations for key scenarios such as capacitor bank switching, main transformer power transfer, and fault line isolation.

Key Technologies

Intelligent Phase-Controlled Circuit Breaker Technology

The system applies voltage zero-cross closing control to limit closing inrush current to ≤ 2.0 times the rated current, and current zero-cross opening control to achieve extremely short arcing duration, reducing contact wear and insulation stress. With high-precision phase-separated and time-separated operation, three-phase discrepancy is kept within ≤ 0.5 ms, enabling independent switching strategies under complex load conditions.
Fast Power Transfer Switching Device

On the 110 kV side, the device achieves a full-link transfer time of ≤ 20 ms (detection ≤ 5 ms + opening ≤ 5 ms + closing ≤ 10 ms), far superior to the traditional 500 ms level of typical ATS systems. It supports multiple switching criteria such as undervoltage, reverse power, and abnormal frequency to improve decision accuracy and system robustness, while multi-channel control and built-in waveform analysis provide visualized and fully traceable switching processes.
Environmental Adaptability & Intelligent Diagnostics

The device is designed to operate reliably in a wide temperature range of -20 °C to +55 °C with strong electromagnetic immunity. It supports multiple communication protocols, including IEC 61850 and Modbus, for flexible integration with SCADA and dispatch automation systems. Built-in modules for event logging, operation recording, and remote maintenance diagnostics facilitate intelligent system-level operation and maintenance.

Application Results and Cases

This solution has been successfullydeployed in multiple backbone grid substations and regional stations at220kV/500kV levels, delivering significant results:

1. Inrush Current During Capacitor SwitchingReduced by Over 70%, effectively minimizing protection malfunctions andequipment wear.

2. Main Transformer Fault Response TimeShortened to Under 20 ms, ensuring uninterrupted power to critical loads.

3. Noticeable Improvement in Overall PowerQuality, with annual fault trip frequency reduced by more than 40%.

4. Provides Strong Support for buildingstable, efficient, and intelligent substation operation systems in modern powergrids.

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