Power systems rely on accurate measurement and protection mechanisms, and at the heart of these systems are current transformers (CTs) and potential transformers (PTs). These instruments ensure electrical measurements remain reliable, insulated, and safe. However, verifying their accuracy requires tools with both intelligence and precision. The Wrindu RDHG-E CT and PT Analyzer is one such instrument—an innovative, all-in-one testing solution designed for modern substations, transformer manufacturers, and electrical utilities. It represents Wrindu’s dedication to smart engineering, ensuring testing precision, speed, and safety for CTs and PTs across various voltage levels.
Redefining CT and PT Testing Efficiency
Traditional CT/PT testers relied on manual voltage regulators, boosters, and current injectors—methods that were often slow, heavy, and less accurate. The Wrindu RDHG-E overcomes these limitations with digital power technology. Built around DSP (Digital Signal Processor) and FPGA (Field-Programmable Gate Array) chips, this device automates analysis, executes high-speed sampling, and provides intelligent computation based on real-time data.
Its innovation lies in its low-frequency excitation method, enabling knee-point voltage tests up to 30 kV for current transformers—safely and precisely. Designed with direct user feedback and years of research, the RDHG-E merges Wrindu’s expertise in high-voltage electronics with unparalleled usability.
| Parameter | Specification |
|---|---|
| Output range | 0–180 V RMS, 12 A RMS, 36 A peak |
| CT/PT ratio range | 1–10,000 |
| Ratio accuracy | ±0.2% |
| Phase measurement accuracy | ±3 minutes |
| Secondary resistance range | 0–300 Ω |
| Resistance accuracy | 1% ±1 mΩ |
| AC load measurement | 0–300 VA, accuracy ±0.1 VA |
| Operating environment | -10°C to +50°C, ≤90% RH |
These specifications empower field engineers to conduct comprehensive CT and PT assessments quickly—combining power, precision, and protection within one compact instrument.
Intelligent Functionality and Automation
The RDHG-E Analyzer is not just a tester—it’s a diagnostic platform. It automatically identifies CT or PT parameters and delivers full-scale results, including:
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Knee point voltage and current
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10% error curve
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Accuracy Limit Factor (ALF)
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Instrument Safety Factor (FS)
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Secondary time constant (Ts)
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Remanence coefficient (Kr)
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Saturated and unsaturated inductance values
The built-in software aligns test modes with IEC60044-1 and IEC60044-6 standards, automatically selecting the proper standard based on the transformer type. This ensures global compliance without manual configuration.
Simple, One-Click Testing
Wrindu engineers focused on ease of use — making complex tests as simple as pressing one key. Operators can complete secondary resistance, excitation, ratio, and polarity tests automatically. The large graphical LCD screen provides immediate results in both visual curves and numerical data. For analysis and reporting, the internal memory can store up to 1000 sets of records, transferable to a PC via USB for conversion into detailed Word reports.
Built-In Printing and Portability
With an integrated micro-printer, test reports can be generated instantly on-site. Despite its full-feature functionality, the RDHG-E remains lightweight, portable, and equally suitable for field and laboratory testing — reflecting Wrindu’s design principle of power without bulk.
Exploring Function Capabilities
The Wrindu RDHG-E covers every essential CT and PT testing need through an integrated digital system:
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Excitation (Volt-Ampere) Testing – Determines core saturation characteristics and identifies critical knee points.
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Ratio Measurement – Ensures precise current and voltage transformation accuracy.
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Polarity Verification – Confirms proper phase alignment between primary and secondary windings.
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Secondary Resistance Testing – Evaluates integrity and connection performance of transformer windings.
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Burden Testing – Measures load characteristics of secondary circuits for compliance and efficiency.
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Phase Displacement Analysis – Accurately identifies angular errors affecting metering and protection systems.
Below is an example of how Wrindu integrates automation into performance assessment:
| Test Type | Key Output Parameter | Wrindu RDHG-E Specialized Feature |
|---|---|---|
| Excitation Test | Knee point voltage & curve | Low-frequency excitation (up to 30kV) |
| Ratio Test | Ratio error & polarity | Automated identification & calculation |
| Resistance Test | Winding resistance | 1% ±1mΩ accuracy using DSP feedback |
| Phase Test | Phase displacement | ±3-minute precision, graphical display |
With this structured approach, Wrindu ensures not only measurement accuracy but also result interpretability—critical for field engineers verifying transformer stability.
Wrindu Expert Views
“The RDHG-E represents a fusion of intelligent electronics and practical engineering. Our goal at Wrindu is to eliminate complexity from high-voltage diagnostics. With this CT/PT Analyzer, engineers can perform multi-standard testing faster, with confidence that each result meets international compliance and scientific rigor. Every curve, every data point, is digitally validated. This marks a new generation of precision for transformer diagnostics—moving the industry toward automation, portability, and absolute trust in measurements.”
Accuracy, Reliability, and Safety
By leveraging advanced hardware processing, the RDHG-E ensures precision even under unstable field conditions. Results remain consistent across multiple tests without recalibration, and all data are protected against sudden power losses—stored permanently in onboard memory. The low-frequency excitation technology minimizes test risks by avoiding high-energy stresses on transformer cores, enabling safer, long-term equipment testing.
The analyzer’s compliance with IEC international standards, combined with its environmental endurance and portability, makes it the preferred choice for substations, transformer manufacturers, and testing laboratories worldwide.
Why Choose Wrindu
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All-in-one testing for CTs and PTs — no separate instruments required.
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Automatic data analysis and standard compliance, ensuring error-free operation.
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Modern DSP/FPGA platform for high-speed, real-time computation.
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PC connectivity and built-in printing for quick documentation.
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Lightweight and rugged—ready for field service and transportation.
The RDHG-E reflects Wrindu’s philosophy of fusing technological intelligence with human-centered design—a hallmark of its global success.
Conclusion
The Wrindu RDHG-E CT and PT Analyzer defines the future of transformer testing through innovation, accuracy, and automation. By combining powerful computing, flexible test modes, and global standards compliance, it enables effortless performance evaluations for power engineers and testing professionals.
Key takeaway: In an age where efficiency and precision determine energy reliability, choosing Wrindu means trusting a partner that puts innovation and accuracy first. The RDHG-E isn’t just a tester—it’s an expert companion that redefines how engineers understand and maintain the heartbeat of modern electrical systems.
FAQs
1. What is the primary purpose of the Wrindu RDHG-E Analyzer?
It tests and analyzes the performance parameters of CTs and PTs, including excitation, ratio, resistance, burden, and polarity.
2. Which international standards does it comply with?
It meets IEC60044-1 and IEC60044-6 standards for current and potential transformers.
3. Can I export test data for reports?
Yes. Results can be transferred to a PC by USB and saved as Word-format reports.
4. How accurate are the measurements?
Voltage and ratio accuracy reach ±0.2%, phase accuracy ±3 minutes, and resistance within 1% ±1 mΩ.
5. Is the RDHG-E suitable for field use?
Absolutely. Its lightweight design, wide temperature range (-10°C to +50°C), and built-in power system make it ideal for both laboratory and on-site operations.