The condition of the insulation is essential for secure and reliable operation of your transformer. Measuring capacitance and dissipation/power factor helps you to determine insulation condition in bushings or between winding.
Changes in capacitance can, for example, indicate mechanical displacements of winding or partial breakdown in bushings. Aging and degradation of the insulation, coupled with the ingress of water, increase the amount of energy that is converted to heat in the insulation. The rate of these losses is measured as dissipation factor.
Principle of Tan Delta Test
A pure insulator when is connected across line and earth, it behaves as a capacitor. In an ideal insulator, as the insulating material which acts as dielectric too, is 100 % pure, the electric current passing through the insulator, only have capacitive component. There is no resistive component of the current, flowing from line to earth through insulator as in ideal insulating material, there is zero percent impurity.
In pure capacitor, the capacitive electric current leads the applied voltage by 90°.
In practice, the insulator cannot be made 100% pure. Also due to the aging of insulators, the impurities like dirt and moisture enter into it. These impurities provide the conductive path to the current. Consequently, an electric leakage current flowing from line to earth through the insulator has a resistive component.
Hence, it is needless to say that, for good insulator, this resistive component of electric leakage current is quite low. In another way, the healthiness of an electrical insulator can be determined by the ratio of the resistive component to the capacitive component. For good insulator, this ratio would be quite low. This ratio is commonly known as tanδ or tan delta. Sometimes it is also referred to as dissipation factor.
JYC Transformer dielectric loss tester Tan Delta Tester C&DF Test Set has anti interference fuction by frequency conversion during insulation loss testing, and it is not necessary to change wire as CVT testing, and same time JYC can test the turn radio of CVT.
● JYC transformer dielectric loss tester Tan Delta Tester C&DF Test Set adopts frequency conversion technology to eliminate field frequency 50Hz, even in frequency interference strong electromagnetic interference environment also can be measured reliably
● Applies big screen dot matrix LCD, testing process through the English menu is intuitive and easy to operating.
● JYC transformer dielectric loss tester tan delta tester C&DF Test Set is a integration tester with standard capacitance and high voltage power supply to bring convenience to on spot test and reduce field wiring
● JYC has CVT test function to realize CVT test by self-excited without external accessories, also JYC can measure CVT voltage ratio function during insulation loss testing.
● Can realize anti-ground wiring measurement, small capacitance ground testing accurately.
● JYC has over-current protection function to ensure the sample will not damaged in short circuit or electric shock
● JYC transformer dielectric loss tester tan delta tester C&DF Test Set is suitable for all power supply unit with a number of CVT units and requiring a high degree of automation.
TECHNOLOGY SPECIFICATION:
Type:
Tan Delta Tester C&DF Test Set
Accurate
Cx: ±(Reading×1%+2pF)
tgδ: ±(Reading×1%+0.00040)
Anti-interference index
With frequency conversion anti-interference, the above accuracy can be achieved under 200% interference.
Capacitance range
Internal application of high voltage: 3pF～60,000 pF/10kV, 60pF～1µF/0.5kV
External application of high voltage: 3pF～1.5µF/10kV, 60pF～30µF/0.5kV
Resolution: Max. 0.001pF, 4 valid digits
Range of tgδ
No limit, resolution:0.001%. Identify capacitive, inductive and resistive tested products automatically.
Test current range
5µA-5A
Internal application high voltage
Setting voltage range: 0.5～10kV
Max. output current: 200mA
Up-down voltage mode: Continuous smoothing
Voltage precision: ±(1.5%×reading+10V)
Voltage resolution: 1V
Testing frequency: 45,50,55,60,65Hz, single frequency
45/55Hz, 55/65Hz, 47.5/52.5Hz, automatic dual frequency
Frequency precision: ±0.01Hz
External application high voltage
Maximum test current at positive connection: 5A, Power frequency or conversion frequency: 40～70Hz
Maximum test current at negative connection: 10kV/5A, Power frequency or conversion frequency: 40～70Hz
CVT self excitation low voltage output
Output voltage: 3～50V, output current: 3～30A
Test time
About 15s, relating to the testing mode
Input power
180V～270V AC, 50Hz/60Hz±1%, Grid power or generator
Environmental temperature
-10℃～50℃
Relative humidity
≤80% RH, no dew
Volume / Weight
L430mm*W320mm*H330mm / 29 kg
All KRI tests will adopt international express to reach any corner of the world as fast as 72 hours
