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Intelligent Fully Automatic SF₆ Density Relay Calibrator: Technology and Applications
I. Introduction
In high-voltage electrical equipment, the performance of SF₆ gas density relays directly impacts operational safety. Traditional calibration methods relying on manual operations suffer from low efficiency, significant errors, and poor environmental adaptability. The ZXMD-2000 fully automatic SF₆ density relay calibrator addresses these challenges through intelligent design and high-precision sensing technology, offering a reliable and efficient solution for power systems. This paper analyzes its technical principles, core functionalities, and engineering applications.
II. Core Technical Principles
1.Dynamic Temperature Compensation Algorithm
Utilizing a 32-bit microprocessor (ARM architecture) and TI high-speed signal processing chips, the system collects real-time ambient temperature (resolution: 0.1°C) and pressure data (resolution: 0.001 MPa). Built-in gas state equations automatically convert pressure values to 20°C equivalents across -20°C to 80°C environments, achieving an error margin ≤ ±0.2%.
2.Multi-Signal Synchronized Detection System
Integrated three-channel independent detection modules support "single alarm + dual lockout" composite signal calibration. Full-metal quick-connect fittings (low-temperature resistant to -40°C) and adaptive gas-path control technology enable zero manual intervention, with gas consumption per test < 0.01 L.
3.Intelligent Diagnostics and Data Management
A built-in fault tree analysis model automatically identifies six common anomalies, including contact adhesion and pressure drift. Equipped with 50 groups of non-volatile storage (NAND Flash) and USB high-speed communication interfaces, it supports offline test data analysis.
III. Key Performance Indicators (Comparative Analysis)
| Parameter | ZXMD-2000 | Traditional Equipment |
| Calibration Accuracy | Class 0.2 (±0.002 MPa) | Class 0.5 (±0.005 MPa) |
| Temperature Range | -20°C to 80°C | 0°C to 50°C |
| Response Time | < 200 ms | > 500 ms |
| Data Storage | 50 groups (with timestamps) | No storage function |
| Calibration Targets | Supports 4 composite signal types | Single-signal calibration only |
IV. Field Application Advantages
1.Non-Disassembly Calibration Technology
Configured with 12 specialized adapters (including EPDM seals), it achieves >98% success rate for on-site calibration across mainstream GIS interfaces (ABB, Siemens, etc.).
2.Energy-Efficient and Eco-Friendly Design
A closed-loop gas recovery system ensures SF₆ gas recovery rate ≥99.8%, reducing annual CO₂-equivalent emissions by 15 kg per unit.
3.Harsh Environment Adaptability
Compliant with IEC 60068-2 standards: operational humidity 90% RH (non-condensing); vibration resistance 5Hz–150Hz/3 Grms.
V. Conclusion
The ZXMD-2000 integrates smart sensing, dynamic compensation, and electromechanical integration to resolve three critical challenges in SF₆ density relay calibration: temperature compensation, multi-signal synchronization, and environmental compliance. Field applications demonstrate a 40% reduction in annual substation maintenance time and a 99.3% anomaly detection rate, establishing it as essential equipment for smart grid operation and maintenance systems.
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/。
