HJS-III Dielectric Loss TesterDetailed product description：

The HJS-III dielectric loss tester is used for on-site anti-interference dielectric loss measurement or laboratory precision dielectric loss measurement. The instrument is an integrated structure with built-in dielectric bridge, variable frequency power supply, test transformer, and standard capacitor. Adopting frequency conversion anti-interference and Fourier transform digital filtering technology, the measurement is fully automated and intelligent, and the measurement data is very stable under strong interference. The measurement results are displayed on a large LCD screen and come with a built-in micro printer for printing and output.

Main functional features of HJS-III dielectric loss tester
1.2.1 Frequency conversion anti-interference
Adopting frequency conversion anti-interference technology, it can accurately measure even under 200% interference, with stable test data, suitable for conducting anti-interference dielectric loss tests on site.
1.2.2 High precision measurement
By using digital waveform analysis and bridge self calibration techniques, combined with high-precision three terminal standard capacitors, high-precision dielectric loss measurement can be achieved.
The input resistance of all ranges of the instrument is below 2 Ω, eliminating the influence of additional capacitance on the measurement cable.
1.2.3 Multi level security protection to ensure personal and equipment safety
High voltage protection: The test sample can cut off the output at high speed by short circuit, breakdown or high voltage current fluctuation.
Low voltage protection: In case of accidental connection to 380V, power fluctuation or sudden power outage, the protection will be activated without causing overvoltage.
Grounding protection: When the instrument is poorly grounded and the casing carries dangerous voltage, the grounding protection is activated.
C V T: Four protection limits for high voltage and current, low voltage and current, which will not damage the equipment; Misselected menu will not output excitation voltage. There is no 10kV high voltage output during CVT measurement.
Anti misoperation: two-stage power switch; Real time monitoring of voltage and current; Multiple button confirmations; The high/low voltage of the wiring terminal is clearly defined; Slow boost, can quickly reduce pressure, sound and light alarm.
Prevent "capacitance rise": When measuring large capacity test samples, there will be a "capacitance rise" effect of voltage rise. The instrument can automatically track the output voltage and maintain a constant test voltage.
Seismic performance: The instrument adopts a unique seismic design, which can withstand strong long-distance transportation vibrations and bumps without damage.
High voltage cable: It is a high-voltage insulated wire that can be dragged to the ground.
1.2.4 Powerful functions and product series
(1) It has positive/reverse wiring, internal/external standard capacitors, multiple working modes of internal/external high voltage, integrated structure, and can perform various conventional dielectric loss tests without the need for any external auxiliary equipment.
(2) LCD display, menu operation, rich test data, automatic discrimination of capacitive, inductive, and resistive samples, with a built-in micro printer for printing output.
(3) It has an external standard capacitor interface, which can be connected to an oil cup for precision insulation oil dielectric loss testing, an external solid material measuring electrode for precision insulation material dielectric loss testing, and an external high-voltage standard capacitor for high-voltage dielectric loss testing.
(4) Automatically identify 50Hz/60Hz system power supply and support generator power supply, even if the frequency fluctuates greatly, it can still be measured normally.
(5) Built in series and parallel dielectric loss measurement models for easy instrument calibration.
(6) Can store 255 sets of measurement data.
(7) When using the CVT self-excited method for measurement, C1/C2 can be measured simultaneously with one wiring, automatically compensating for the effects of bus grounding and standard capacitor voltage division, without the need for wire replacement or external accessories.
(8) Chinese graphic menu, large backlit LCD display for clearer clarity, real-time monitoring of current and voltage.
(9) Optimized circuit design ensures consistent accuracy and stability of forward/reverse wiring.
(10) Automatically identify the frequency of the external high-voltage test power supply between 40Hz and 70Hz, supporting high-capacity and high-voltage dielectric loss tests for power frequency power supplies, variable frequency power supplies, and series resonant power supplies.
(11) Equipped with reverse wiring low-voltage shielding function, C11 can perform 10kV reverse wiring dielectric loss measurement without disconnecting the wire when the 220kV CVT bus is grounded.
(12) Equipped with computer interface. Through this interface, measurement, data processing, and report output can be achieved, as well as upgrading the internal measurement software of the instrument. Can be integrated into a comprehensive high-voltage test vehicle.

Main technical specifications of HJS-III dielectric loss tester
Accuracy: Cx: ± (reading x 1%+1pF)
TG δ: ± (reading x 1%+0.00040)
Anti interference index: Frequency conversion anti-interference, can still achieve the above accuracy under 200% interference
Capacity range: Internal high voltage: 3pF~60000pF/10kV 60pF~1 μ F/0.5kV
External high voltage: 3pF~1.5 μ F/10kV, 60pF~30 μ F/0.5kV
Resolution: up to 0.001pF, 4 significant digits
Range of TG δ: unlimited, resolution 0.001%, automatic identification of three types of samples: capacitance, inductance, and resistance.
Test current range: 10 μ A~5A
Internal high voltage: Set voltage range: 0.5-10kV
Maximum output current: 200mA
Pressure rise and fall method: continuous smooth adjustment
Voltage accuracy: ± (1.5% x reading+10V)
Voltage resolution: 1V
Test frequency: 45, 50, 55, 60, 65Hz single frequency
45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency conversion
Frequency accuracy: ± 0.01Hz
External high voltage: maximum test current of 1A when connected positively, frequency or variable frequency 40-70Hz
The maximum test current during reverse wiring is 10kV/1A, with a frequency range of 40-70Hz for power frequency or variable frequency
CVT self-excited low-voltage output: output voltage 3-50V, output current 3-30A
Measurement time: about 40 seconds, depending on the measurement method
Input power supply: 180V~270VAC, 50Hz/60Hz ± 1%, powered by mains or generator
Computer interface: Standard RS232 interface
Printer: Brilliance A7 Thermal Microprinter
Environmental temperature: -10 ℃ to 50 ℃