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Performance and Application of the ZXHQ-B+ CT/PT Analyzer
Abstract
The ZXHQ-B+ CT/PT Analyzer is a high-performance, multi-functional test instrument developed to meet the growing demands of power industry professionals for comprehensive instrument transformer verification. Built on advanced DSP and ARM architectures, the device combines robust performance with ease of use, delivering accurate, reliable test results while streamlining workflows for field and laboratory testing. This article explores its core features, technical specifications, and practical applications, highlighting its value in ensuring the safety and accuracy of current transformers (CTs) and voltage transformers (PTs) in power systems.
1. Introduction
Instrument transformers (CTs and PTs) are critical components in power systems, serving as the interface between high-voltage equipment and measurement, protection, and control devices. Their performance directly impacts the accuracy of metering, the reliability of protective relaying, and the safety of power grid operations. As power systems grow more complex and demanding, there is an increasing need for test equipment that can efficiently and accurately verify transformer performance across a wide range of parameters.
The ZXHQ-B+ CT/PT Analyzer addresses this need, designed with extensive input from industry professionals and grounded in rigorous theoretical research. It combines advanced hardware, intelligent automation, and comprehensive testing capabilities to become a versatile tool for instrument transformer verification.
2. Core Functional Features
The ZXHQ-B+ Analyzer is engineered to meet the full spectrum of CT and PT testing requirements, making it a one-stop solution for instrument transformer validation.
2.1 Comprehensive Test Coverage
For CTs (including TP-class transformers), the analyzer supports excitation (volt-ampere) characteristics, ratio, polarity, secondary winding resistance, secondary burden, ratio error, and phase displacement tests. For PTs, it covers electromagnetic unit excitation characteristics, ratio, polarity, secondary winding resistance, ratio error, and phase displacement. This breadth of functionality eliminates the need for multiple specialized instruments, reducing test setup time and complexity.
2.2 Intelligent Parameter Calculation
The device automatically computes critical transformer parameters, including knee point voltage/current, 10% error curves, accuracy limit factor (ALF), instrument security factor (FS), secondary time constant (Ts), remanence coefficient (Kr), and saturated/unsaturated inductance. These calculations eliminate manual data interpretation, reducing the risk of human error and accelerating test analysis.
2.3 Compliance with Global Standards
The analyzer is designed to meet international and national standards, including IEC 60044, GB 1208 (-1), and GB 16847 (IEC 60044-6). It automatically selects the appropriate test protocol based on transformer type and specifications, ensuring test results are consistent with regulatory requirements.
2.4 Advanced Low-Frequency Test Technology
Leveraging a low-frequency test principle, the analyzer can perform CT excitation tests at knee voltages up to 60 kV. This capability enables accurate testing of high-voltage transformers without requiring large, high-voltage test equipment, making field testing safer and more efficient.
2.5 User-Friendly Operation
The all-English graphic interface is intuitive and easy to navigate, minimizing the learning curve for new users. The device supports one-click testing for CT secondary resistance, excitation, ratio, and polarity, streamlining routine test workflows. It also stores up to 1000 test data sets, which remain intact during power outages. Data can be exported to a PC via USB for further analysis and report generation in Word format, simplifying documentation and compliance reporting.
3. Key Technical Specifications
The ZXHQ-B+ Analyzer’s performance is defined by its robust technical parameters, which ensure accuracy and reliability in diverse testing environments:
Parameter | Specifications |
Output | 0~180 Vrms, 12 Arms (36 A peak) |
Voltage Measurement Accuracy | ±0.2% |
CT Ratio Test | Range: 1~40000; Accuracy: ±0.1% |
PT Ratio Test | Range: 1~40000; Accuracy: ±0.1% |
Phase Measurement | Range: ±2 min; Accuracy: 0.5 min |
DC Resistance Test | Range: 0~300 Ω; Accuracy: 0.2% ± 2 mΩ |
Burden Test | Range: 0~1000 VA; Accuracy: 0.2% ± 0.02 VA |
Power Supply | AC 220 V ±10%, 50 Hz |
Operating Conditions | Temperature: -10°C ~ 50°C; Humidity: ≤90% |
Dimensions & Weight | 365 mm × 290 mm × 153 mm; Weight < 10 kg |
These specifications highlight the analyzer’s precision, versatility, and portability, making it suitable for both laboratory use and on-site testing.
4. Practical Applications in the Power Industry
The ZXHQ-B+ CT/PT Analyzer is an essential tool for several key applications in the power sector:
Transformer Factory Acceptance Testing (FAT): Verifies CT/PT performance against design specifications before installation, ensuring compliance with quality standards.
Site Commissioning Testing: Validates transformer performance post-installation, confirming that equipment meets operational requirements and identifying potential issues before grid energization.
Periodic Maintenance Testing: Supports routine testing of in-service transformers to detect degradation, such as winding resistance changes or excitation characteristic shifts, before they impact system performance.
Fault Investigation: Provides detailed test data to diagnose transformer-related issues, such as protection misoperation or metering inaccuracies, enabling targeted troubleshooting.
5. Conclusion
The ZXHQ-B+ CT/PT Analyzer represents a significant advancement in instrument transformer testing technology, combining comprehensive functionality, high accuracy, and user-friendly design into a single, portable device. Its ability to meet global standards, automate complex calculations, and streamline testing workflows makes it an invaluable tool for power industry professionals. By ensuring the reliability and accuracy of CTs and PTs, the analyzer plays a critical role in maintaining the safety, efficiency, and stability of modern power systems.
As power grids continue to evolve, the demand for advanced test equipment like the ZXHQ-B+ will only grow, making it a key investment for utilities, testing laboratories, and engineering firms committed to maintaining high standards of performance and safety.
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/
