KDBR-IV integrates transformer capacity testing and characteristic parameter measurement into a single instrument. It features automatic range switching up to 750V/100A and comprehensive analysis including capacity ratings, no-load/load loss, and impedance voltage. The device features waveform distortion correction, temperature compensation, and vector graphic display with an accuracy of ±0.5%. It can store 500 test records and has built-in printer and PC connectivity for convenient and efficient field operation.

1. Capable of high-precision measurement of the capacity of various distribution transformers;
2. Comprehensive parameter measurement: No-load loss/current, load loss, impedance voltage, RMS/average voltage, current, power, power factor, frequency;
3. Automatic internal range switching enables wide-range voltage/current measurement with simple wiring;
4. Automatic connection verification via vector diagram display during three-phase transformer testing;
5. Single-phase test power supply for single-phase impedance measurement;
6. Direct automatic measurement within the range; measurement range can be extended by connecting external voltage/current transformers;
7. Automatic waveform distortion correction, voltage/current/temperature compensation;
8. Manual setting of impedance voltage and no-load current test current/frequency;
9. Full load testing at full current for transformers ≤1000KVA; full load testing at 1/3 rated current for transformers ≤3150KVA;
10. Maximum 750V/100A with internal protection; no range switching errors;
11. Automatic estimation of the performance class of three-phase oil-immersed distribution transformers;
12. Multiple automatic calibrations: waveform, temperature, and non-rated voltage/current;
13. 320×240 high-brightness LCD screen with touch buttons, adjustable brightness, suitable for all seasons;
14. 40 preset test parameters, with add/delete functionality;
15. Built-in real-time electronic clock for recording test date/time;
16. Panel-mounted thermal printer for convenient on-site printing of test results;
17. Stores 500 test data points, supporting browsing and PC data transfer;
18. Supports external VT/CT for measuring any parameter.

1. Environmental conditions
Temperature: -5C~40C
Relative humidity:<95% (25C)
Altitude:<2500m
External interference: no particularly strong vibrations, no particularly strong electromagnetic fields
External power supply: 220VAC ± 10%, 45Hz~55Hz

2. Measurement range
Capacity: 30KVA to 65000KVA
Voltage: 0-750V, automatic range switching inside the instrument
Current: 0-100A, automatic range switching inside the instrument
Voltage testing range: Ua Ub、Uc、Up 0～750V， Accuracy: 0.2 level;
Current testing range: Ia Ib、Ic、Ip 0～100A， Accuracy: 0.2 level;

3. Testing accuracy
Voltage: 0-100V, ± 0.2% FS; 100～700V，±0.2%
Current: 0-10A, ± 0.2% FS; 10～100A，±0.2%
Power: ± 0.5% (Cos Φ>0.1), ± 1.0% (0.02<cos Φ<0.1)<span="" style="box sizing: border box; text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; margin: 0px; padding: 0px; outline: none; ">
Capacity testing: accuracy level 0.5;
Load loss: accuracy level 0.5;
Impedance voltage: Uk and its percentage Uk% Accuracy: Level 0.5;
No load loss: accuracy level 0.5;
No load current: accuracy level 0.5;

4. Insulation strength
The insulation resistance between the voltage and current input terminals and the casing is ≥ 100M Ω.
The working power input terminal is subjected to a power frequency of 2KV (effective value) between the casing for 1 minute during the experiment.

5. Other indicators
Frequency: 45Hz~65Hz
Dimensions: 400 × 300 × 220mm
Weight: 12Kg (excluding test line)