TTR Test Data Inconsistent? Repeated Wiring Reducing Efficiency? GDBC-901B Battery-Powered Version Offers A Field Solution
Publish Time: 2026-06-17 Origin: Site
When conducting transformer turns ratio and group tests in the field, several common problems repeatedly arise: single-phase phase-by-phase testing requires separate measurements of phases A, B, and C; slight differences in contact resistance during the three wiring operations can reduce the lateral comparability of the three-phase data; some instruments cannot complete the test with special structures such as Z-type or rectifier transformers due to a lack of corresponding algorithms; data must be recorded on-site and then entered later, posing a risk of transcription errors.
GDBC-901B transformer turns ratio tester addresses these scenarios with its functional design. Designed according to relevant power testing standards, the instrument measures turns ratios from 1 to 10000, with an accuracy of ±0.2% within the 1 to 1000 range, covering 1 to 12 groups, and an angle error of less than 0.5 degrees. It is applicable to distribution transformers, substation main transformers, and both conventional and special transformers.
Synchronous Three-Phase Voltage Output Reduces Time-Division Measurement Differences | |
| In single-phase sequential testing, the output and contact states between three measurements are difficult to perfectly align, affecting the lateral comparison of three-phase data. The GDBC-901B employs simultaneous three-phase output test voltages, with high voltage applied synchronously to phases A, B, and C, and low-voltage induced voltage sampled synchronously. Wiring is completed in one step; after clicking "Run," the voltage automatically increases, and the three-phase transformation ratio, error, and group are calculated and displayed simultaneously. This process eliminates phase switching, reducing additional differences introduced by time-division measurements. |
Supports Special Transformer Wiring Modes
Z-type grounding transformers and rectifier transformers have winding structures different from conventional two-winding transformers. The GDBC-901B provides five wiring modes: DY, YD, DD, YY, and ZN. When measuring Z-type transformers, selecting the ZN mode allows the internal algorithm to process the voltage phase relationship based on this wiring type, eliminating the need to consult formulas or modify external wiring. A single instrument covers both conventional and special equipment, reducing the need for multiple dedicated instruments.
Parameter Preset and Data Storage Management
GDBC-901B allows for one-time input of equipment number, rated voltage, wiring method, and voltage regulation ratio. After switching taps on a multi-tap transformer, testing continues, and results are automatically stored sequentially. It has a built-in storage capacity of 200 sets and supports on-site printing. Connecting to a PC via USB allows the accompanying software to generate standardized WORD reports, reducing manual data entry and formatting.
Built-in Battery Power Supply and Protection Function
Outdoor substations or remote locations may lack AC power. The GDBC-901B has a built-in 12V/15000mAh lithium battery, which can operate continuously for over 10 hours on a full charge. The battery level is independently indicated on the panel. Upon startup, a small voltage is output to check the high and low voltage wiring for correctness; if reversed, a warning is issued and the process terminates. In case of short circuit or overcurrent, the protection circuit automatically cuts off the output. When operating in a energized substation, the grounding terminal must be connected to earth first before wiring.
Technical Significance of Turns Ratio Testing
Turning ratio testing not only verifies the nameplate values but also checks whether the tap changer position corresponds to the actual voltage ratio, determines whether there are inter-turn short circuits in the windings, and provides a basis for determining whether transformers can be operated in parallel. Excessive deviation in the turns ratio between two parallel transformers will generate circulating current, increase heat generation, and may trigger protection actions in severe cases. This test is a routine component of handover and preventative procedures.
GDBC-901B is designed to maintain long-term testing consistency, expand the types of equipment it can be used with, and simplify field operation. Three-phase synchronous output, electronic control, and a built-in battery form its technical framework. Touchscreen interaction, automatic data aggregation, and report generation free operators from repetitive tasks.
If the testing team has questions about the efficiency of turns ratio testing, data reliability, or compatibility with special transformers, they can further investigate the instrument's performance parameters. Abnormal field data is sometimes not due to defects in the tested equipment, but rather because the accuracy or adaptability of the testing instrument no longer meets the requirements. Selecting equipment with matching functions helps improve the accuracy of test conclusions and the smoothness of field operations.