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Technical Analysis and Comparative Study of ZXBXZ Series Resonant AC Withstand Voltage Test Systems for Substation Equipment
The ZXBXZ series resonant AC withstand voltage test systems represent a critical advancement in high-voltage testing technology for substation equipment up to 500kV. Designed to address the dual requirements of high-voltage/low-current and low-voltage/high-current testing scenarios, these systems leverage series resonance principles to deliver precision, safety, and operational flexibility. This article provides a technical deep dive into the ZXBXZ series, focusing on its design philosophy, performance benchmarks, and comparative advantages across configurations.
Core Design Philosophy
The ZXBXZ systems integrate a variable-frequency power supply, excitation transformer, reactors, and capacitive voltage dividers. By adopting a modular architecture, the systems achieve two key objectives:
1.Adaptability: Configurable reactor arrangements (series/parallel) enable testing across diverse equipment types (transformers, GIS, cables, etc.).
2.Efficiency: Resonance-based excitation minimizes input power requirements while maintaining pure sinusoidal waveforms (<1% distortion).
The inclusion of a rectifier stack and microammeter in the capacitive divider extends functionality to DC withstand voltage tests, outperforming conventional test transformers in output quality.
Key Performance Highlights
1.Intelligent Operation
Dual-mode control: Automated resonance tracking/voltage ramping vs. manual fine-tuning.
Grid voltage auto-compensation ensures stable output under fluctuating supply (±15% tolerance).
2.Safety & Reliability
Grounding/flashover protection, real-time overcurrent shutdown.
Dry-type epoxy-cast reactors: High mechanical/electrical strength, low thermal rise.
3.Scalability
Reactor banks support flexible voltage/capacity scaling (e.g., ZXBXZ-800 uses hybrid dry/oil-immersed reactors).
Comparative Analysis of Configurations
A critical evaluation of six standard configurations reveals tailored solutions for varying voltage classes and test objects:
Model | Key Components | Applications |
ZXBXZ-50/50/25 | 3kW supply, 2×25kV reactors | 10kV transformers, switches, ≤1km cables |
ZXBXZ-108/108/27 | 5kW supply, 4×27kV reactors | 35kV transformers, ≤2km 10kV cables |
ZXBXZ-200/200/50 | 10kW supply, 4×50kV reactors | 110kV GIS, ≤1km 35kV cables |
ZXBXZ-270/270/45 | 15kW supply, 6×45kV reactors | 110kV GIS/transformers, ≤3km 10kV cables |
ZXBXZ-800/400/50 | Hybrid 30kW supply, 8×50kV dry + 4×100kV oil reactors | 220kV transformers, 110kV cables ≤1.5km |
ZXBXZ-1600/800/200 | 60kW supply, 4×200kV oil reactors | 500kV GIS, 220kV cables ≤1.0km |
Critical Observations:
1.Power Density: Lower voltage models (e.g., ZXBXZ-50) prioritize portability with dry reactors, while high-voltage variants (e.g., ZXBXZ-1600) adopt oil-immersed reactors for enhanced insulation and heat dissipation.
2.Frequency Stability: All models achieve ±0.05% frequency stability, critical for avoiding harmonic-induced equipment stress.
3.Economic Efficiency: Mid-range models (e.g., ZXBXZ-200) balance cost and versatility for regional utilities, whereas ZXBXZ-800/1600 target large-scale grid operators.
Advanced Features for Technicians
1.Resonance Tuning Algorithms
Auto-tuning within 30–300Hz optimizes testing time while avoiding mechanical resonances in test objects.
2.Multi-Voltage Compatibility
Single-phase 220V/three-phase 380V input support simplifies field deployment.
3.Data Integrity
Post-test data storage (voltage/time logs) aids compliance reporting.
Case Study: Cable Testing Optimization
For a 35kV, 1.2km cable (300mm²), the ZXBXZ-270 configuration demonstrates efficiency:
1.Reactor Setup: 6×45kV reactors in parallel → 45kV/6A → 270kVA capacity.
2.Test Parameters: 52Hz resonance, 85kV output (2×U₀), 60-minute continuous operation.
3.Advantage: 30% faster commissioning vs. conventional test transformers due to automated frequency sweep.
The ZXBXZ series redefines substation testing through its harmonization of precision, adaptability, and operational safety. By analyzing configuration-specific capabilities—from compact 10kV solutions to ultra-high-voltage 500kV systems—technicians can strategically deploy these devices to minimize downtime, reduce energy consumption, and ensure regulatory compliance. Future iterations may further integrate IoT-enabled diagnostics, but the current generation already sets a benchmark in resonant testing technology.
GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/
