Transformer Turn Ratio Tester|XHBB128B
Product Overview
The XHBB128B Transformer Turn Ratio Tester replaces traditional single-phase bridge methods with a precision three-phase inverter power supply, delivering faster, more accurate, and more comprehensive transformer ratio analysis. Unlike conventional testers that rely on mains power and measure phase-by-phase, the XHBB128B generates its own clean three-phase test voltage—eliminating harmonic interference and enabling simultaneous three-phase measurement with automatic vector group identification (0-11). From standard distribution transformers to specialized Z-type, rectifier, furnace, grounding, and phase-shifting transformers, the instrument handles the industry's widest variety of winding configurations.
Featuring a 7-inch high-definition color touch screen LCD with step-by-step Chinese prompts, the XHBB128B requires no instruction manual during field operation. After inputting transformer rated parameters, it automatically measures turn ratio, voltage ratio, ratio error, and tap changer position for up to 99 taps—including asymmetric tap changers. Comprehensive protection features (reverse connection, turn short circuit, tap changer failure, full output short circuit) ensure reliable operation in demanding field environments, while USB, RS232, and built-in printer interfaces support paperless data management.
Key Features
- Three-Phase Precision Inverter Power: Generates clean test voltage internally, eliminating harmonic interference from unstable mains power and ensuring consistent accuracy even when powered by generators
- Simultaneous Three-Phase Measurement: Measures all three phases in a single test cycle with automatic wiring group identification (0-11), dramatically faster than phase-by-phase bridge methods
- Wide Ratio Range 0.9-10,000: Three accuracy grades up to ±0.1%+2 words, suitable for transformers from small instrument types to large power units
- 99-Tap Changer Support: Automatically identifies exact tap position including asymmetric tap changers after rated parameter input, eliminating manual position recording
- Universal Transformer Compatibility: Supports Z-type, rectifier, grounding, electric furnace, phase-shifting, and balance transformers—far beyond standard power and distribution types
- 7-Inch HD Color Touch LCD: Modular display with step-by-step Chinese prompts—complete operation without referencing the user manual
- Comprehensive Protection Suite: High/low voltage reverse connection, turn-to-turn short circuit, tap changer open/close failure, and output full short circuit protection
- USB + RS232 + Printer: Triple data output with USB flash drive storage, serial communication, and built-in thermal printer for flexible data management
- Automatic Error Calculation: Input rated data once—the instrument computes ratio error and tap position for every subsequent measurement automatically
- Rugged Field Case: Multi-functional engineering plastic case with cold/temperature resistance, sealed waterproofing, and drop/shock protection
Technical Specifications
| Measurement Performance |
| Test Range |
0.9 ~ 10,000 |
| Accuracy (0.9-500) |
±0.1% + 2 Words |
| Accuracy (501-2000) |
±0.2% + 2 Words |
| Accuracy (2001-10000) |
±0.5% + 2 Words |
| Resolution |
0.0001 |
| Output Voltage |
Auto-Adjust Based on Connected Load |
| Testing Capabilities |
| Measurement Modes |
Three-Phase, Single-Phase, Z-Type Transformer |
| Wiring Group Identification |
Automatic 0-11 Recognition |
| Max Tap Changer Positions |
99 Taps (Including Asymmetric) |
| Compatible Transformers |
Standard, Z-Type, Rectifier, Grounding, Furnace, Phase-Shifting, Balance |
| Test Power Source |
Built-in Three-Phase Precision Inverter |
| Interface & Data |
| Display |
7-inch HD Color Touch Screen LCD |
| Data Storage |
USB Flash Drive + Internal Memory |
| Data Interfaces |
USB + RS232 Serial |
| Printer |
Built-in Thermal Printer |
| Operating Specifications |
| Working Power |
AC 220V±10%, 50±1Hz |
| Operating Temperature |
-10℃ ~ 40℃ |
| Operating Humidity |
≤85%, Non-condensing |
| Protection |
Reverse, Short Circuit, Tap Failure, Full Output Short |
| Physical Specifications |
| Dimensions (Main Unit) |
360 × 290 × 170mm |
| Dimensions (Cable Case) |
360 × 290 × 170mm |
| Weight (Main Unit) |
5.9kg |
| Weight (Cable Case) |
5.65kg |
Frequently Asked Questions
Q1: How does the three-phase inverter power supply improve measurement accuracy over traditional testers?
Traditional turn ratio testers use mains power as the measurement voltage source, making them susceptible to harmonic distortion, voltage fluctuations, and frequency variations that degrade accuracy—especially when operating from generators at field sites. The XHBB128B generates its own clean three-phase test voltage through a precision inverter circuit, completely isolating the measurement from mains power quality. This eliminates harmonic interference, ensures consistent accuracy across all testing environments (including generator-powered sites), and enables simultaneous three-phase measurement with automatic vector group identification.
Q2: What transformer types can the XHBB128B test beyond standard distribution transformers?
The XHBB128B supports the most comprehensive range of transformer types in its class: standard three-phase and single-phase transformers, Z-type (zigzag) transformers, rectifier transformers, grounding transformers, electric furnace transformers, phase-shifting transformers, and balance transformers. The instrument automatically compensates for the unique winding characteristics of each type and includes specialized measurement modes for three-phase, single-phase, and Z-type configurations. This versatility makes it suitable for transformer manufacturers, power utility maintenance depots, and industrial facilities with diverse transformer fleets.
Q3: How does the automatic tap changer position identification work?
After entering the rated high-voltage, rated low-voltage, equal tapping level (step percentage), and tapping type (total number of positions) for the transformer under test—once—the XHBB128B automatically calculates the ratio error and identifies the exact tap changer position for every subsequent measurement. For asymmetric tap changers where the rated tap is not at the midpoint, the instrument correctly identifies positions without error. It supports up to 99 tap positions, and for on-load tap changers where positions 9, 10, and 11 share the same value, entering 9 as the tapping type ensures correct position reporting across the full range.
Q4: What protection features ensure reliable field operation?
The XHBB128B incorporates four dedicated protection circuits: high/low voltage reverse connection protection prevents damage from incorrect test lead attachment, turn-to-turn short circuit protection safeguards both the instrument and transformer during winding faults, tap changer open/close failure protection detects mechanical issues, and output full short circuit protection handles accidental cable faults. These protections, combined with the rugged cold/heat-resistant, waterproof, and shock-resistant engineering plastic carrying case, ensure reliable operation in demanding substation and manufacturing floor environments.
Q5: What are the MOQ, warranty terms, and included accessories for the XHBB128B?
The minimum order quantity is 1 unit, with payment via T/T or L/C. Standard delivery is 5-10 working days in a multi-functional engineering plastic case. Each XHBB128B includes the main test unit, complete four-wire test lead set (high and low voltage sides), power cord, RS232 serial cable, ground wire, 2 spare fuses (1A), thermal printer paper roll, and comprehensive user manual. The instrument carries a 12-month warranty covering manufacturing defects with lifetime technical support. Annual supply capacity reaches 500 units. For volume pricing or technical consultation, please contact our sales team.
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