Transformer capacity and parameters | Detailed introduction of technical principles

The core principle of a transformer capacity characteristic tester is based on the transformer's equivalent circuit model. Through low-voltage, low-current field testing, it measures key parameters such as the transformer's short-circuit impedance and load loss, comparing these parameters with those in a standard database or on the nameplate to determine its true capacity.

Specifically, the instrument applies a single-phase or three-phase test voltage far below the rated value to the transformer's low-voltage side, short-circuiting the high-voltage side. It then measures the short-circuit impedance and the losses (the main component of load loss) under this condition. Since the transformer's short-circuit impedance is approximately inversely proportional to its capacity, and the load loss has a clear correlation with capacity, by comparing the measured percentage of short-circuit impedance and load loss with the standard values for transformers of the same type and capacity in the national standard database, the true capacity can be accurately determined, and the falsification of nameplate parameters can be detected. This method does not require a high-current load and is a highly efficient, non-destructive field testing method. Transformer Capacity and Load Tester, Transformer Capacity and Parameter Tester, Transformer Capacity Test Range: 6.3～125000kVA

The MS-560 instrument is a multi-functional measuring instrument, equivalent to two conventional testing instruments: an active transformer capacity characteristic tester and a transformer characteristic parameter tester.

It can precisely measure a series of power frequency parameters of various transformers, including capacity, type, no-load current, no-load loss, load loss, and impedance voltage.

The product has many advantages such as small size, light weight, high measurement accuracy, good stability, and simple operation.

It can completely replace the previous method of measuring transformer losses and capacity using multiple meters, making wiring simpler and testing and recording more convenient,

significantly improving your work efficiency.

1. Can measure the capacity of various distribution transformers and substation transformers on-site without the need for an external power supply, making testing more convenient and faster.

2. Combined with external power supply, voltage regulation, voltage boosting, and current boosting equipment, it can measure the no-load current, no-load loss, impedance voltage, load loss, and other characteristic data of various transformers.

3. All test results are automatically corrected. You only need to input relevant parameters (such as temperature, no-load correction factor, etc.),

and the instrument will automatically perform various corrections such as waveform distortion correction, temperature correction, non-rated voltage correction, and non-rated current correction, making the test results more accurate.

4. In transformer characteristic measurement, the maximum voltage range can reach 750V, and the maximum current range can reach 100A, and it is equipped with internal protection circuitry. 5. Measurement accuracy is guaranteed without switching ranges during measurement, and there's no need to worry about damaging the instrument due to incorrect range selection.

6. During transformer characteristic testing, both voltage and current ranges can be flexibly and easily expanded by simply connecting external voltage and current transformers, greatly widening the instrument's testing range.

7. A large, high-brightness LCD display with a full Chinese menu and operation prompts provides a very user-friendly interface; the wide-temperature, adjustable-brightness LCD screen adapts to different ambient temperatures.

8. Based on the no-load and load losses in the test results, the performance level of three-phase oil-immersed distribution transformers and electric transformers can be automatically estimated for on-site reference by staff. (Currently, the instrument can only perform performance level estimations on three-phase oil-immersed distribution transformers and electric transformers. The estimated results are invalid for other types of transformers.)

9. Zero-sequence impedance measurement is applicable to high-voltage side star-connected transformers with a neutral point. The instrument can record zero-sequence impedance, zero-sequence reactance, zero-sequence inductance, impedance angle, and zero-sequence resistance.

1. Built-in power supply output range

① Voltage: 0～10V

② Current: 0～10A

2. Characteristic channel test range and accuracy

① Voltage range: AC 50-750V. Accuracy, ±0.2% (F.S) ±2 digits

② Current range: AC 0.5A-100A. Accuracy: ±0.2% (F.S) ±2 digits
3. Power and other indicator measurement accuracy

③ Active power: ±0.5% (F.S) (CosΦ>0.1)

④ ±1.0% (F.S) ±2 digits (0.02<CosΦ<0.1)

⑤ No-load (load) loss measurement: ±2% (0.1≤CosΦ≤1)

4. Transformer capacity test range: 6.3～125000kVA

5. Operating temperature: -20℃～+60℃

6. Power supply requirements: Adapter output 12.6V 1000mA, AC 160V～265V

7. Insulation

① Insulation resistance between capacity test, voltage, and current input points and the chassis ≥100MΩ

② Charging power input to chassis withstands 2kV (RMS), test duration 1 minute