New-Look Transformer Oil Tan Delta Tester Insulation Oil Tangent Delta Testing Equipment
What is the Tan Delta Test?
Tan Delta which is also termed as Dielectric Dissipation or Loss Angle or Power Factor testing method which is performed for testing of insulating oil to know the quality level of the oil. This kind of testing methodology is carried out at two temperature levels. The results that are obtained from the two tests are compared and then consideration is taken in the quality level of the coil. If the test results are good, the oil is continued in service and when the test results are not as expected, then either replacement or change in oil takes place.
The main purpose of the tan delta test is to make sure of maintaining a secure and reliable functioning of the transformer. With the calculation of dissipation factor and capacitance values, it provides the result of insulation behavior of bushings and in windings too.
Variation in the capacitance value, for instance, it indicates partial kind of breakdowns in bushings and automated movement of windings. Insulation deprivation, aging of the equipment, enhancement in the energy levels is transformed into heat. The amount of losses in these is calculated as the dissipation factor.
With the tan delta testing method, one can easily know the dissipation factor and the capacitance values at the required level of frequencies. So, any kind of aging factor can be identified earlier and the corresponding action can be implemented.
When a pure insulator has a connection between the earth and the line, then it performs like a capacitor. In an ideal kind of insulator, as the insulating substance functions as a dielectric, which is totally pure, then the passage of current through the material holds only capacitive material. There will be no resistive element for the electric current that is flowing from the line to the earth via insulator as in the insulating component, there will be no presence of impurities. The tan delta test circuit diagram is shown as follows:
In a pure capacitive material, the capacitive current precedes the voltage level by 900. As a general, the insulating material is totally pure, and even because of the aging properties of the components, the contaminations such as moisture and dirt might get added. These contaminations create a conductive path for the current. As a result, leakage current that flows from line to earth via the insulator holds resistive elements.
Therefore, it is pointless to claim that, for a good quality of insulator, this resistive element of leakage current is correspondingly minimal. In the other aspect, the behavior of an insulator might be known by the proportion of the resistive element to that of the capacitive element. For good quality of insulator, this proportion is correspondingly less and this is termed as tanδ or tan delta. In a few cases, this is also expressed as a dissipation factor. With the below-depicted vector diagram, it can be known.
Where the x-axis represents the level of system voltage which is the resistive element of leakage current IR. As this capacitive element of leakage current IC precedes by 900, it is taken across the y-axis.
And now, the whole leakage current is given by IL(IC + IR)
And from the diagram, tanδ is (IR /IC)
| Use condition |
-15ºC∽40ºC RH<80% |
| Power supply |
AC 230V |
| AC high voltage output |
400V-2200V ±2%,at intervals of 100V 50VA |
| DC high voltage output |
200V-600V ±2% |
| Temperature control induction stove |
Max power 500w |
| Temperature control range |
<100ºC |
| Temperature measuring error |
±0.5ºC |
| Temperature control error |
0.1ºC |
| Control temperature time |
Room temperature 90ºC <20min
|
| Measurement Range |
tgδ No limitation
C x 15PF-300PF
R 10M-20T |
| Resolution |
△ tgδ: 0.001%
△ Cx :0.01pF
△ Rx :0.01 |
| Precision |
△ tgδ: ±(reading*1%+0.020%)
△ Cx :±(reading*0.5%+0.5PF)
△ Rx :±reading * 10% |
| Relative dielectric constant εr |
Calculated automatically from Cx,
with the same accuracy as Cx |
| Volumetric resistivity ρ |
Calculated automatically from Rx,
with the same accuracy as Rx |
| Size & Weight |
410*265*280mm,12.5kg |
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