EN
TWR-S Portable Transformer TTR Tester Turns Ratio Meter for HV Electrical Equipment
The TWR-S Portable Transformer TTR Tester from HV HIPOT is a high-precision field-oriented turns ratio measurement instrument, purpose-built for commissioning, routine maintenance and winding fault diagnosis of HV electrical assets including power transformers, distribution transformers and instrument transformers.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The TWR-S Transformer Turns Ratio Tester is a professional, high-precision portable test instrument engineered for comprehensive turns ratio (TTR) verification and winding condition assessment of power and distribution transformers. Adopting an advanced digital bridge measurement circuit and high-stability pure sine wave test source, it delivers accurate, repeatable measurement of transformer turns ratio, phase angle, and vector group, the core indicators for verifying transformer design compliance, identifying winding faults, and validating tap changer performance.
With a wide turns ratio measurement range of 0.8~10000, industry-leading ±0.05% measurement accuracy, and fully automatic one-click test workflow, this tester eliminates manual operation and human error. Fully compliant with IEC 60076-1, IEEE C57.12.90, and GB/T 1094.1 international and domestic standards, it is the industry-preferred solution for transformer manufacturers, electric power utilities, industrial maintenance teams, third-party testing institutions, and research laboratories worldwide. It is optimized for factory outgoing inspection, on-site acceptance testing, routine preventive maintenance, and fault diagnosis of single-phase/three-phase power transformers, distribution transformers, special-purpose transformers, and instrument transformers (CT/PT).
Specifications
| Parameter Category | Specification |
| Core Measurement Performance | |
| Model | TWR-S |
| Turns Ratio Measurement Range | 0.8 ~ 10000 |
| Turns Ratio Measurement Accuracy | ±0.05% of reading (0.8 ~ 2000); ±0.2% of reading (2000 ~ 10000) |
| Ratio Resolution | 0.0001 |
| Phase Angle Measurement Range | 0° ~ 360° |
| Phase Angle Accuracy | ±0.2° |
| Phase Angle Resolution | 0.001° |
| Vector Group Identification | 0 ~ 11 points (covers all standard connection groups) |
| Test Source Output | 3-phase AC 0~120V, pure sine wave, THD <1% |
| Test Compatibility | |
| Supported Transformers | Single-phase/three-phase power transformers, distribution transformers, special-purpose transformers, Z-type grounding transformers, CT/PT instrument transformers |
| Supported Connection Modes | DY, YD, DD, YY, YNyn, Dyn11, YNd11, ZN, and all standard connection groups |
| OLTC Testing | Full-tap position continuous automatic testing, automatic tap position calculation |
| Special Functions | Blind test (auto group identification), automatic demagnetization, temperature compensation, polarity detection |
| Operation & Data Management | |
| Display | 7-inch high-brightness color touchscreen |
| Operation Modes | Fully automatic mode + manual mode |
| Data Storage | 10,000+ groups of test records, full traceability |
| Data Export | USB 2.0, Excel/PDF format report export |
| Printer | Built-in high-speed thermal printer |
| Language Support | English/Chinese bilingual |
| Environmental & Physical Specifications | |
| Power Supply | AC 220V±10%, 50/60Hz (optional built-in battery) |
| Rated Power Consumption | <100W |
| Operating Temperature | -20℃ ~ +50℃ |
| Storage Temperature | -30℃ ~ +70℃ |
| Operating Humidity | ≤85% RH (non-condensing) |
| EMC Compliance | IEC 61000-4 series |
| Dimensions | 320mm × 280mm × 160mm |
| Net Weight | ~6kg |
| Compliance Standards | IEC 60076-1, IEEE C57.12.90, GB/T 1094.1, IEC 61010, CE |
Applications
Core Test Objects
· Oil-immersed and dry-type power transformers (10kV~500kV class)
· Distribution transformers, pad-mounted transformers, and box-type substations
· Special-purpose transformers: rectifier transformers, traction transformers, wind turbine transformers, photovoltaic transformers, furnace transformers, and phase-shifting transformers
· Z-type (zig-zag) grounding transformers and earthing transformers
· Instrument transformers: current transformers (CT) and voltage transformers (PT)
Industry-Specific Usage
· Transformer Manufacturers: Production line quality control, factory outgoing inspection, and type testing for design validation
· Electric Power Utilities: On-site acceptance testing, routine preventive maintenance, and fault diagnosis of substation transformers
· Industrial & Petrochemical Facilities: Maintenance and performance verification of critical power transformers in high-reliability production plants
· Rail Transit & Urban Infrastructure: Traction transformer testing for metro, high-speed railway, and urban rail transit systems
· Renewable Energy Projects: Factory and on-site testing of wind turbine and solar photovoltaic step-up transformers
· Third-Party Testing & Certification Bodies: Compliance testing, performance verification, and arbitration testing of power transformers
· Research & Academic Institutions: Transformer insulation research and high-voltage engineering experimental research
Advantages
Strict Global Standard Full Compliance
Fully designed, calibrated, and tested in accordance with IEC 60076-1 (Power transformers – Part 1: General), IEEE C57.12.90 (Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers), and GB/T 1094.1 international standards. Test data is globally recognized, meeting the strict requirements of transformer export certification, grid access, and third-party laboratory accreditation.
Unmatched Measurement Accuracy & Stability
±0.05% ultra-high measurement accuracy and advanced digital bridge circuit ensure highly repeatable and reliable test results. It accurately captures minor ratio deviations caused by winding shorted turns, tap changer misalignment, incorrect connections, and core faults, providing a definitive basis for transformer maintenance and fault diagnosis.
Full Transformer Type & Scenario Adaptability
Supports all standard and special transformer types, including Z-type grounding transformers and phase-shifting transformers, with a blind test function that eliminates the need for pre-input connection group information. It is suitable for both fixed laboratory precision testing and mobile on-site field maintenance, with a wide operating temperature range and strong anti-interference performance.
Fully Automated Efficient Testing
One-click fully automatic test workflow and OLTC full-tap continuous testing drastically reduce test time and labor costs. A 19-tap transformer can be fully tested in less than 10 minutes, significantly improving production efficiency for transformer manufacturers and on-site maintenance efficiency for utilities.
Ultimate Operator Safety & Ease of Use
Multi-layer redundant safety protection and fully isolated test circuit ensure maximum operator safety during testing. Intuitive touchscreen interface, one-click operation, and automatic report generation eliminate complex manual settings, reducing the operational threshold for field technicians.
Low Total Cost of Ownership
Industrial-grade components ensure long service life with minimal maintenance costs. Integrated design eliminates the need for additional test equipment, reducing upfront investment. Accurate fault detection helps users avoid unplanned outages and costly transformer repairs, delivering excellent long-term return on investment.
FAQ
Q: What international standards does the TWR-S comply with?
A: The tester is fully designed, calibrated, and tested in accordance with IEC 60076-1 (Power transformers – Part 1: General), IEEE C57.12.90, and GB/T 1094.1 international standards. Test data is globally recognized for transformer export certification and grid access compliance.
Q: What is the turns ratio measurement range and accuracy?
A: The turns ratio measurement range is 0.8 ~ 10000, with an accuracy of ±0.05% of reading for the 0.8~2000 range, and ±0.2% for the 2000~10000 range, fully meeting the ±0.5% tolerance requirement specified in IEC 60076-1.
Q: What types of transformers can the TWR-S test?
A: It supports all types of transformers, including single-phase/three-phase power transformers, distribution transformers, rectifier transformers, traction transformers, wind turbine transformers, photovoltaic transformers, Z-type grounding transformers, and current/voltage instrument transformers (CT/PT).
Q: Can it automatically test all tap positions of an on-load tap changer (OLTC)?
A: Yes. The tester supports automatic continuous testing of OLTC at all tap positions, with automatic tap position calculation, error trend analysis, and pass/fail judgment, greatly improving test efficiency for transformers with tap changers.
Q: Can it automatically identify the transformer's vector group?
A: Yes. It has a built-in blind test function, which automatically identifies the transformer's connection mode and vector group without pre-input group information, simplifying on-site operation for field technicians.
Q: Can it generate and export standard test reports?
A: Yes. It has a built-in thermal printer for on-site real-time report printing, and supports USB export of test records and automatically generated standard test reports in Excel/PDF format, with full traceability for compliance documentation.
