I. Performance Characteristic

1. Output current of the instrument is great (maximum output is 20A) and testing scope is wide(maximum 2KΩ), which is applicable to temperature rise test and measurement of DC resistance of all transformers at 35KV voltage class and below.

2. Perfect double power supply design. Simultaneous testing and individual testing function of high voltage side and low voltage side.

3. This machine has protection alarm function for input mis-connection of AC380V power supply, wire breakage and arcing resistant protection function and sound discharging alarm function, indication is clear and mis-operation is reduced. With perfect protection circuit, reliability is strong.

4. Large colourful screen, touching control operation and display data is clear and legible.

5. Temperature rise testing is printed out automatically according to setting time, and temperature rise data are stored, which facilitate recording.

6. The instrument is equipped with the perpetual calendar, 100 groups of conventional data storage, and result storages of 3 temperature rise tests. Data will not be lost after shutdown, which facilitate review. It is equipped with the “U disc” interface which conveniently export data for the machine to generate the temperature rise curve.

7. The instrument is equipped with RS485 communication interface, remote control measurement can be realized after upper position machine operation and control software is installed.

8. This machine is equipped with temperature rise software, which can carry out data processing and generate temperature rise curve automatically.

II. Technical Index

1. Output current:

High voltage CH1:   5A, 1A, 0.3A,0.1A, 0.01A

Low voltage CH2:   20A, 10A, 5A, 2A

2. Measuring scope:

(High voltage CH1---5A)：   0Ω——4Ω

(High voltage CH1---1A)：   20mΩ——20Ω

(High voltage CH1---0.3A)： 60mΩ——60Ω

(High voltage CH1---0.1A)： 200mΩ——200Ω

(High voltage CH1---0.01A)：2Ω——2000Ω

(Low voltage CH2---20A)： 0Ω——0.1Ω

(Low voltage CH2---10A)： 2mΩ——0.4Ω

(Low voltage CH2---5A)：  4mΩ——0.8Ω

(Low voltage CH2---2A)：  10mΩ——2Ω

3. Accuracy: (high voltage CH1): 0.2%±1μΩ

(Low voltage CH2):0.2%±0.2μΩ

4. Minimum resolution: 0.1μΩ

5. Interval for temperature rise record data: 5s-90s (Can be set at 5s interval)

6. Working temperature: -20～40℃

7. Ambient humidity: ≤80%RH, no dewing

8. Working power supply: AC: AC220V±10%, 50Hz±1Hz

9. Volume: 360mm length × 280mm width × 170mm height

10. Net weight: 8 kg