The DC resistance of a transformer is a necessary measurement project for the semi-finished product, the finished product factory test, the installation, the handover test, and the preventive test of the power sector in the transformer manufacturing. Can effectively find Transformer coil material selection, welding, loose connection, stock loss, breakwire and other manufacturing defects and hidden dangers after operation. In order to meet the needs of DC resistance rapid measurement of Transformers, we have developed HYG series DC resistance tester based on the advantages of our own technology. The instrument adopts a new power supply technology, which has the characteristics of small size, light weight and large output current. The whole machine is controlled by a single chip microcomputer and automatically completes the functions of self-inspection, data processing, and display. It has automatic discharge and discharge indication functions. The instrument has high precision and simple operation, and can realize the fast measurement of transformer direct resistance.

The HYG-3L DC Resistance Test Instrument(20T) uses a dual power supply structure to windings the connected Transformer YN connection to achieve simultaneous three-phase charging. The measurement system adopts independent three-channel current sampling and independent three-channel voltage sampling. At the same time, the three-phase resistance value and three-phase imbalance ratio are measured and displayed. The working time is greatly shortened, and the problem of long time for DC resistance testing of power Transformers is solved. The required time is only 1/3 of that of traditional methods.

1, output current: 0 ~ 20A(automatically selected by volumetric)

2, range: 0 ~ 50 Ω

3, accuracy: 0.2 % ± 0.2 μΩ

4, minimum resolution: 0.1 μΩ

<5, working temperature: -20 ~ 40 °C

6, environmental humidity: ≤ 80 % RH, no dew

7, working power supply: AC: AC220V ± 10 %, 50Hz ± 1Hz

8, volume: 420mm long × width 320mm × height 200mm

9, net weight: 10.6 kg

1, the tester automatically select the output current(up to 20A output).

2, the measurement range is wide(0Ω -50 Ω), can measure Transformer, Transformer and other perceptual DC resistance.

3, the display uses 480 × 272 dot matrix 65K color color big screen, the display data is clear and easy to read.

4, this instrument has a calendar, 100 sets of data storage, temperature automatic conversion and other functions, shut down does not lose data. This machine also has a printer that can print test data, and the "U disk" interface facilitates the export of data for reference editing.

5, the tester is equipped with RS485 communication interface, with the upper computer control software, to achieve long-distance control measurement.

6, the tester is equipped with three identical measurement functions, in order to deal with the star-type winding to complete the three-phase direct resistance measurement, automatic calculation of the three-phase imbalance rate, greatly saving measurement time to improve work efficiency. It is also possible to use the phase-by-phase test function to conduct phase-by-phase testing of Transformers in the YN and D(Y) connection modes. The test is completed and the three-phase imbalance rate is automatically calculated.

The instrument also has an automatic magnetic assistance function. For the test of the five-column low-voltage angle Transformer winding of the iron core, the method of high and low voltage string excitation is used for testing. The instrument automatically connects the magnetic assistance loop of the winding, which can quickly and accurately test the low voltage winding. DC resistance.

7,This machine has sound discharge alarm, clear discharge indication, reduce misoperation.

8, this machine has the input misconnection AC380V power protection alarm protection function, to reduce the damage to the instrument caused by misoperation, this machine also has a complete anti-potential protection anti-arc ability.

9, this machine has the characteristics of wide temperature, high accuracy, shockproof, anti-interference, high stability, and easy to carry.