ESR-800 Series HV Resonant Test System (Umbrella Reactor Build in Divider )

Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators. According to different users, different tested equipment, different test requirements, the device can be customized according to needs.

product names: Ac voltage resonant device、Variable frequency resonant、Frequency conversion series resonance、Series resonance、Series resonant transformer、Frequency conversion series resonance voltage withstand device for electrical equipment、Series resonance test equipment、Complete equipment for frequency conversion series resonance test.

Traditional Power-Frequency Test Transformers

Compact & Lightweight: Conventional transformers require bulky power supplies for high-voltage output. Series resonance uses frequency conversion to reduce power supply capacity needs, cutting weight by over 60% for easy onsite deployment.

High Adaptability: Auto-adaptation to test object capacitance (cables, GIS, generators) by adjusting frequency (30-300Hz). Eliminates capacity limitations of traditional transformers with high capacitive loads.

Energy Efficiency & Safety: In-phase current/voltage during resonance minimizes energy consumption (70% less). Advanced overcurrent/overvoltage protection reduces insulation damage risks.

VLF (Very Low Frequency) Systems

Faster Testing: VLF requires prolonged testing (e.g., 15 mins at 0.1Hz ≈ 1 min at 50Hz). Series resonance uses near-power-frequency output, cutting test time by 80% while complying with IEC/IEEE accelerated aging standards.

Accurate Diagnostics: Pure sinusoidal waveforms under resonance reveal true insulation defects, avoiding misjudgment caused by VLF waveform distortion.

Multi-Application Support: Covers cable AC withstand, transformer induced voltage, and GIS tests. VLF is limited to partial cable types.

Control Unit: Converts 50/60Hz grid power to adjustable frequency (30-300Hz).

Excitation transformer: Boosts converter output to energize reactors.

High voltage resonant reactor: Tunable inductance (series/parallel) to form resonant circuit with test object capacitance (C).

Capacitive voltage divider: Monitors high-voltage output with ±1% accuracy for closed-loop control.

Step 1: Calculate target resonant frequency f=1/(2π√LC)f=1/(2π√LC) based on test object capacitance (C), then auto-configure reactor combinations (L value).

Step 2: Adjust output frequency until circuit impedance minimizes (resonance). Reactor voltage amplifies test object voltage, generating high voltage with minimal input capacity (1/5~1/10 of traditional transformers).

Step 3: Maintain resonance for scheduled withstand test. Built-in flashover protection trips output within 2ms.