該裝置設計用於根據IEC 60247測定變壓器油和其它電介質液體的介質損耗正切δ值和介電常數。
操作原理
其工作原理是，當一個有效值高達2kV的測試正弦電壓同時施加到參考電容器和測量對象（即該裝置的測量單元）上時，測量訊號的振幅和相位差異。
從參考電容器和測量單元的內部電極上獲取的訊號的振幅之差與被研究液體的介電常數成正比。從參考電容器和測量單元內部電極取得的訊號之間的相位差表徵了介電損耗正切的δ值。
優勢
- 快速測量，同時保持精度。
- 測量過程是自動化的，由內建微處理器控制，可以保存測量結果並可用列表機列印。
- 過程透由它專屬軟體 「Tangent Service 」來完成，可即時查看結果，也可以圖形或數值形式對測量進行存檔。
- 設置的可變動性 - 可用於研究目的。
- 重量輕，體積小，易於使用。
| no |
Item |
Value |
| 1 | Operating AC voltage, V |
85 – 264 |
| 2 | Power frequency, Hz |
48 – 63 |
| 3 | Power requirement, VA |
Below 250 |
| 4 | Applied measuring voltage АС, kV |
Sinusoidal, 500 – 2000 V actual |
| 5 | Tan δ measurement range |
0,00001 – 1 |
| 6 | Tan δ measurement resolution |
1х10-5 |
| 7 | Tan δ measurement accuracy |
+/- 1% of measurement + 0,00008 |
| 8 | Measurement range of relative dielectric constant ε |
1,0 – 15,0 |
| 9 | Accuracy of ε measurement |
+/- 1% |
| 10 | Electrical capacitance C measurement range, pF |
20 – 1000 |
| 11 | Accuracy of С measurement, pF |
+/- 1% + 1 |
| 12 | Oil temperature measurement range, ᴼС (oF) |
20 – 110 (68 – 230) |
| 13 | Measuring cell volume, cm³ (in³) |
42 (2,6) |
| 14 | Electric capacity of an empty cell, pF |
65 – 85 |
| 15 | One measurement duration, minutes, not more than |
5 |
| 16 | AC frequency setting range, Hz |
45 – 65 |
| 17 | Temperature measurement resolution, oС (oF) |
0,5 (33) |
| 18 | Inbuilt printer |
None |
| 19 | Process temperature, oС (oF) |
0 – 50 (32 – 122) |
| 20 | Storage temperature, oС (oF) |
– 20 (- 4) to +60 (+140) |
| 21 | Relative humidity, % |
Up to 90 without condensation |
| 22 | Dimensions, mm (in) |
400 (16) Х 450 (18) Х 300 (12)* |
| 23 | Weight, kg (lbs), not more than |
5,3 (12)* |
* – with installed and connected cell
The unit is designed for determining dielectric loss tangent and permittivity of transformer oils and other dielectric fluids according to the IEC 60247.
It is a fully automatic device that allows testing according to the procedures defined in these standards, as well as according to the user procedures specified in the appropriate section of the setup menu.
Operating principle
The principle of operation is based on measuring the difference in amplitudes and phases of signals obtained when a test sinusoidal voltage with an effective value of up to 2 kV is applied simultaneously to the reference capacitor and the object of measurement, which is the measuring cell of the unit.
The difference between the amplitudes of the signals taken from the reference capacitor and the internal electrode of the measuring cell is proportional to the dielectric constant of the liquid under study. The phase difference between the signals taken from the reference capacitor and the internal electrode of the measuring cell characterizes the value of the dielectric loss tangent.
advantage
- fast measurements whith maintaining accuracy;
- the measurement process is automated, controlled by a computer, you can save the results and print them on a printer;
- can be completed with engineering software “Tangent Service”, thanks to which it is possible to view the results online, as well as an archive of measurements in graphic or digital form;
- variability of settings – can be used for research purposes;
- light weight, compact size, easy to use.
| no |
Item |
Value |
| 1 | Operating AC voltage, V |
85 – 264 |
| 2 | Power frequency, Hz |
48 – 63 |
| 3 | Power requirement, VA |
Below 250 |
| 4 | Applied measuring voltage АС, kV |
Sinusoidal, 500 – 2000 V actual |
| 5 | Tan δ measurement range |
0,00001 – 1 |
| 6 | Tan δ measurement resolution |
1х10-5 |
| 7 | Tan δ measurement accuracy |
+/- 1% of measurement + 0,00008 |
| 8 | Measurement range of relative dielectric constant ε |
1,0 – 15,0 |
| 9 | Accuracy of ε measurement |
+/- 1% |
| 10 | Electrical capacitance C measurement range, pF |
20 – 1000 |
| 11 | Accuracy of С measurement, pF |
+/- 1% + 1 |
| 12 | Oil temperature measurement range, ᴼС (oF) |
20 – 110 (68 – 230) |
| 13 | Measuring cell volume, cm³ (in³) |
42 (2,6) |
| 14 | Electric capacity of an empty cell, pF |
65 – 85 |
| 15 | One measurement duration, minutes, not more than |
5 |
| 16 | AC frequency setting range, Hz |
45 – 65 |
| 17 | Temperature measurement resolution, oС (oF) |
0,5 (33) |
| 18 | Inbuilt printer |
None |
| 19 | Process temperature, oС (oF) |
0 – 50 (32 – 122) |
| 20 | Storage temperature, oС (oF) |
– 20 (- 4) to +60 (+140) |
| 21 | Relative humidity, % |
Up to 90 without condensation |
| 22 | Dimensions, mm (in) |
400 (16) Х 450 (18) Х 300 (12)* |
| 23 | Weight, kg (lbs), not more than |
5,3 (12)* |
* – with installed and connected cell