Introduction

Transformer capacity characteristic tester can accurately measure the capacity of various distribution transformers, passive measurement, and can measure the 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 conditions). The operator only needs to input the correction index according to the transformer type, and the instrument will automatically calculate the corrected result. It allows external 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 to test the capacity of standard distribution power transformers under low voltage and small current conditions. The built-in test power supply can complete the capacity test of 100 sets of 2500KVA distribution transformers on a single charge. It adopts advanced A/D synchronous AC sampling technology and digital signal processing technology. The circuit design is exquisite, the idea is unique, the performance is superior, the function is powerful, the volume is small, and the weight is light. It adopts integrated design, which is convenient for carrying and field operations, and can fully meet the requirements of on-site distribution power transformer capacity testing. Chinese character display, printing the measurement data that users care about.



2 Design Original Intention

China's power system implements a two-part electricity price: in addition to charging the fees measured by the metering device, basic electricity fees are also charged according to transformer capacity; for larger users, a one-time capacity increase fee is also paid when the transformer is put 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 adopted various fraudulent means (mainly changing or replacing transformer nameplates) to achieve the purpose of paying less fees and using more electricity; some users steal electricity fees amounting to hundreds of thousands of yuan annually, and the power department is troubled by the lack of effective control measures. The transformer characteristics-capacity comprehensive tester is a high-precision instrument specially developed and researched by the company to address this problem, specifically for measuring transformer capacity and loss parameters.



3 Usage Characteristics

The transformer capacity characteristic tester comes with a high-efficiency rechargeable battery, which can work without an external power supply. A single charge can continuously measure dozens to hundreds of units; at the same time, the internal digital synthesis of three-phase standard sine wave signals (not simply inverter AC output, ensuring the accuracy of test data under non-rated conditions) can provide a three-phase precision AC test source through a power amplifier; when measuring transformer capacity and short-circuit loss, there is no need for external three-phase test power supply, voltage regulators, current boosters, and other auxiliary equipment, simplifying wiring and greatly improving work efficiency; the capacity test result accuracy rate 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. It can completely replace the previous method of measuring transformer loss and capacity using multiple meters. The wiring is simple, testing and recording are convenient, and work efficiency is greatly improved. The transformer capacity characteristic tester uses a large-screen graphic liquid crystal as the display window, with graphic menu operation and Chinese character prompts, integrating multiple parameters on one screen. The human-machine dialogue interface is friendly, and it is simple and fast to use, making it the preferred product for power users at all levels.



4 Characteristics

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



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



3. Can measure the 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 conditions). The operator only needs to input the correction index according to the transformer type, and the instrument will automatically calculate the corrected result. It is very suitable for units that do not have conditions for short-circuit tests on slightly larger capacity transformers.



5. Wide voltage range: the maximum voltage can be measured up to 750V, and accuracy is guaranteed 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 liquid crystal display, full Chinese menu and operation prompts to achieve friendly human-machine dialogue, touch buttons make operation easier, wide temperature liquid crystal with brightness adjustment, adaptable to winter and summer seasons.



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



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