Power Systems & Drives

A switching solution specifically designed for disturbance-free bypassing of high-voltage variable-frequency drives, dynamic compensation links in SVG systems, and zone isolation in DC microgrids.

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Industry Technical Advantages

Millisecond-Level Synchronized Fast-Switching Capability

A proprietary electromechanical actuation mechanism enables precise control of closing and opening response times, ensuring minimal inrush current when high-voltage motors switch from variable-frequency to line-frequency operation.

Ultra-High Overvoltage and Harmonic Insulation Rating

Designed to withstand high-frequency harmonics and voltage transient spikes generated during medium- and high-voltage variable-frequency operation and SVG-cascaded H-bridge operation, featuring an extremely high impulse withstand voltage (BIL).

Strong Magnetic Arc Blowing and Deep-Grid Arc Extinguisher

To address the challenge of DC microgrids where current does not naturally cross zero, a strong magnetic field is used to force large DC arcs into a deep-grid arc extinguisher hood for cooling and extinguishing.

Highly Reliable Micro-Switch Signal Feedback

Auxiliary contacts utilize a dust-proof micro-switch design with millisecond-level on/off response times, providing reliable status interlocks for the inverter’s main control PLC and DCS systems.

Manufacturing and Rigorous Testing

Lightning Impulse Residual Voltage and Power-Frequency Withstand Voltage Test Laboratory

Equipped with medium- and high-voltage insulation impulse test equipment to verify the safety margin of dielectrics under high-harmonic topologies.

Millisecond-Level Digital Synchronous Recorder

Detects 100% of the closing and tripping discreteness of factory-produced bypass devices, with tolerances strictly controlled within 1 ms.

High-Frequency Harmonic High-Current Full-Load Temperature Rise Test Platform

Simulates the temperature rise behavior of switches under operating conditions containing abundant higher-order harmonics, ensuring no overheating or softening occurs over the long term.

Selection Guide

Bypass Switching Time Limits

Based on the main control PLC’s bypass control algorithm (one-to-one or one-to-many synchronous switching), strict requirements for contactor tripping and closing times are clearly defined.

Harmonic Current Derating Considerations

Significant higher-order harmonics are present in SVG and high-voltage variable-frequency circuits; a derating margin of 1.2 to 1.5 times the harmonic content must be applied to the continuous operating current.

DC Circuit Reactance Time Constant (L/R)

The DC microgrid disconnection circuit stores energy in its inductance; the circuit’s L/R parameters must be provided to verify the energy absorption capacity of the high-magnetic-field arc chamber.

Interlock Logic Configuration

Specify whether a factory-integrated rigid mechanical interlock lever mechanism is required, or whether a purely electrical auxiliary switch interlock is sufficient.