Comparative Analysis of ZXBXZ Series Resonant AC Withstand Voltage Test Systems for Substation Electrical Equipment

The ZXBXZ series resonant AC withstand voltage test system represents a critical advancement in high-voltage testing technology for substation equipment. Designed for comprehensive testing of transformers, GIS systems, SF6 switches, cables, and other capacitive devices up to 500kV, this system leverages series resonance principles to deliver precision, safety, and flexibility. This article provides a technical comparison of ZXBXZ configurations, focusing on design philosophy, performance metrics, and application-specific adaptability.

Core Technology and Working Principle

The ZXBXZ system operates on the principle of series resonance, where inductive reactance (from adjustable reactors) cancels out capacitive reactance (from the test object) at a specific frequency. This enables efficient energy transfer with minimal input power, achieving high output voltages (up to 1000kV) while maintaining sinusoidal waveform purity (<1% distortion). Key advantages include:

1.Low power consumption: Only losses in the circuit (resistive components) require compensation.

2.Precision control: Frequency tuning (30–300Hz) ensures optimal resonance for diverse test objects.

3.Dual-mode operation: Automated resonance tracking simplifies testing, while manual mode offers granular control.

Configuration Comparison and Application Scope

1. Low-Capacity Systems (ZXBXZ-50/50/25)

Components: 3kW inverter, 2×25kV reactors, 3kVA excitation transformer.

Applications: Ideal for 10kV-class equipment (transformers ≤1000kVA, cables ≤1km).

Advantages: Compact design, cost-effective for routine maintenance in distribution networks.

Limitations: Limited to low-voltage, short-cable tests.

2. Mid-Tier Systems (ZXBXZ-200/200/50)

Components: 10kW inverter, 4×50kV reactors, 10kVA transformer.

Applications: 110kV transformers (≤50MVA), 35kV cables (≤1km), and GIS preventive tests.

Advantages: Balances power and portability; supports mid-voltage infrastructure.

Key Feature: Modular reactors enable series/parallel reconfiguration for variable inductance.

3. High-Voltage Systems (ZXBXZ-800/400/50)

Components: Hybrid dry/oil-immersed reactors (8×50kV + 4×100kV), 30kW inverter.

Applications: 220kV transformers (≤80MVA), 110kV cables (≤0.7km), and GIS/PG testing.

Advantages: Combines dry-type flexibility with oil-immersed thermal stability for extended 60-minute full-load operation.

Innovation: Dual reactor types optimize space and cooling efficiency.

4. Ultra-High-Voltage Systems (ZXBXZ-1600/800/200)

Components: 60kW inverter, 4×200kV oil-immersed reactors, 800kV capacitive divider.

Applications: 500kV GIS, 220kV cables (≤1km), and large transformer testing.

Advantages: Unmatched voltage scalability; robust thermal management for critical transmission assets.

Trade-off: Increased weight and footprint due to oil insulation.

Performance Benchmarking

Technical Advantages Over Conventional Methods

1.Waveform Integrity:

Traditional test transformers produce harmonic-rich outputs due to non-resonant operation, risking insulation damage. ZXBXZ’s pure sine wave minimizes dielectric stress during tests.

2.Energy Efficiency:

Resonant systems reduce input power by 70–90% compared to linear test transformers, lowering operational costs and grid dependency.

3.Adaptive Voltage Stabilization:

Real-time voltage correction (±0.05% stability) compensates for grid fluctuations, ensuring repeatable test conditions.

4.Multifunctional Design:

Integrated DC withstand voltage testing (via rectifier stacks) eliminates the need for separate DC test sets.

Case Study: Optimizing Reactor Configuration

For testing a 35kV, 300mm² cable (1.2km), the ZXBXZ-270/270/45 employs six 45kV reactors in parallel to achieve:

Total inductance: ​

​

Resonant frequency:  ≈45Hz
This setup ensures compliance with IEC 60840 standards while avoiding overvoltage risks from higher frequencies.

The ZXBXZ series exemplifies a scalable, intelligent solution for modern substation testing. Lower-tier models excel in distribution network maintenance, while high-voltage configurations address EHV transmission challenges. Its hybrid reactor architecture, adaptive control algorithms, and compliance with IEEE 400-2012/IEC 62199 standards position it as a versatile tool for utilities and testing contractors. Future iterations may integrate AI-driven predictive tuning to further reduce setup times for complex capacitive loads.

GDZX is a manufacturer of power testing equipment, offering a wide range of product categories with comprehensive models and providing professional technical support. Contact: +86-17396104357.Website: https://www.highvoltage-testequipment.com/