Introduction

Transformer Capacity Characteristic Tester can accurately measure the capacity of various distribution transformers, with passive measurement, and can simultaneously measure no-load current, no-load loss, short-circuit voltage, short-circuit loss, and zero-sequence impedance of various types of transformers. It can also automatically perform waveform distortion correction, temperature correction, voltage correction (no-load test under non-rated voltage), and current correction (short-circuit test under non-rated current). The operator only needs to input the correction index according to the transformer type, and the instrument will automatically calculate the corrected results. It allows external connection of voltage and current transformers to expand the measurement range, and can measure any parameters of the test object.



Transformer Capacity Characteristic Tester is an instrument specially used for testing the capacity of standard distribution power transformers under low voltage and low current conditions. The built-in test power supply can complete capacity tests for 100 units of 2500KVA distribution transformers on a single charge. It adopts advanced A/D synchronous AC sampling technology and digital signal processing technology, with exquisite circuit design, unique ideas, superior performance, powerful functions, small size, and light weight. It adopts an integrated design, making it easy to carry and suitable for field operations, fully meeting the requirements for on-site capacity testing of distribution power transformers. It features Chinese character display and prints measurement data of concern to users.



2 Design Intent

China's power system implements a two-part tariff: in addition to the fees charged by metering devices, basic electricity charges are also collected based on transformer capacity; for larger users, a one-time capacity increase fee is required when putting transformers into operation. With the development of the power industry and the increase in electricity consumption, self-owned transformers and privately contracted transformers have gradually occupied a considerable share of distribution transformers. Consequently, individuals have resorted to various fraudulent means (mainly altering or replacing transformer nameplates) to reduce fees and increase electricity usage; some users steal electricity fees amounting to hundreds of thousands of yuan annually, and power departments lack effective control measures. The Transformer Characteristic-Capacity Comprehensive Tester is a high-precision instrument specially developed and researched by the company to address this issue, specifically for measuring transformer capacity and loss parameters.



3 Usage Features

The Transformer Capacity Characteristic Tester comes with a high-efficiency rechargeable battery, allowing operation without an external power supply. A single charge can continuously measure dozens to hundreds of units; simultaneously, it internally synthesizes a three-phase standard sine wave signal (not a simple inverter AC output, ensuring the accuracy of test data for various test items under non-rated conditions), and through a power amplifier, it can provide a three-phase precision AC test source; when measuring transformer capacity and short-circuit loss, there is no need for external three-phase test power supplies, voltage regulators, current boosters, and other auxiliary equipment, simplifying wiring and greatly improving work efficiency; the capacity test result accuracy reaches 100%. It is equivalent to two devices: an active transformer capacity tester + a transformer loss parameter tester. It can precisely measure a series of power frequency parameters such as capacity, no-load current, no-load loss, short-circuit loss, and impedance voltage of various transformers. The Transformer Capacity Characteristic Tester has the advantages of small size, light weight, high measurement accuracy, good stability, and simple and easy operation, fully replacing the previous multi-meter method for measuring transformer loss and capacity. It has simple wiring, convenient testing and recording, and greatly improves work efficiency. The Transformer Capacity Characteristic Tester uses a large-screen graphical LCD as the display window, with graphical menu operation and Chinese character prompts, integrating multiple parameters on one screen. The human-machine interface is friendly, easy and quick to use, making it the preferred product for power users at all levels.



4 Features

1. Can accurately measure the capacity of various distribution transformers, with passive measurement, convenient and accurate.



2. Built-in power supply, automatically generates a three-phase high-power test power source.



3. Can measure no-load current, no-load loss, short-circuit voltage, and short-circuit loss of various types of transformers.



4. Can automatically perform waveform distortion correction, temperature correction, voltage correction, and current correction (short-circuit test under non-rated current). The operator only needs to input the correction index according to the transformer type, and the instrument will automatically calculate the corrected results, making it very suitable for units that do not have conditions for short-circuit tests on slightly larger capacity transformers.



5. Wide voltage range: maximum voltage measurement up to 750V, ensuring accuracy without switching gears. It will not damage the instrument due to incorrect voltage gear selection.



6. Battery remaining capacity percentage indication function, not just a simple low battery alarm.



6. Large screen, high-brightness LCD display, full Chinese menu and operation prompts for friendly human-machine dialogue, touch buttons for easier operation, wide-temperature LCD with brightness adjustment, adaptable to winter and summer seasons.



7. Users can print test data at any time through the micro printer.



8. Test result storage function, can store 200 sets of capacity test data.