HSY-5654A Dielectric Loss Tester is designed and manufactured in accordance with GB/T5654-2007 "Measurement of Relative Permittivity, Dielectric Dissipation Factor and DC Resistivity of Liquid Insulating Materials". It is used for measuring the dielectric dissipation factor and DC resistivity of liquid insulating media such as insulating oil. The instrument features an integrated structure, internally incorporating key components including a dielectric loss oil cup, temperature controller, temperature sensor, dielectric loss test bridge, AC test power supply, standard capacitor, high resistance meter, and DC high voltage source. Utilizing full digital technology, the instrument enables fully intelligent automated measurement. It is equipped with a large 5.7-inch TFT full-color LCD touch display, with a fully Chinese menu interface. Test results can be automatically stored and printed, allowing operators to use it proficiently without specialized training.

I. Main Functions and Features

(1) The oil cup adopts a three-electrode structure compliant with the national standard GB/T5654-2007, with an inter-electrode spacing of 2mm, eliminating the effects of stray capacitance and leakage on dielectric loss test results.

(2) The instrument uses medium-frequency induction heating and a PID temperature control algorithm. This heating method offers non-contact heating between the oil cup and the heating element, uniform heating, fast speed, and convenient control, ensuring that the temperature is strictly maintained within the preset error range.

(3) The internal standard capacitor is an SF6 gas-filled three-point electrode capacitor. The dielectric loss and capacitance of this capacitor are unaffected by environmental temperature and humidity, ensuring long-term accuracy of the instrument.

(4) Comprehensive protection functions. In case of overvoltage, overcurrent, or high-voltage short circuit, the instrument quickly cuts off the high voltage and issues a warning. A warning is also issued if the temperature sensor fails or is not connected.

A temperature-limiting relay is installed in the medium-frequency induction heating furnace. When the temperature exceeds 120°C, the relay releases and heating stops.

(5) Convenient test parameter settings. Temperature setting range: 40–120°C; AC voltage setting range: 200–2200V; DC voltage setting range: 0–500V.

(6) Equipped with a large TFT full-color LCD touch display for clear visibility. With simple settings, the instrument can automatically perform tests and store and print results.

(7) Built-in real-time clock. Test date and time can be saved, displayed, and printed along with the test results.

(8) Empty electrode cup calibration function. Measures the capacitance and dielectric dissipation factor of the empty electrode cup to assess its cleaning and assembly condition. Calibration data is automatically saved to facilitate accurate calculation of relative permittivity and DC resistivity.

(9) The instrument is built around the RAM9 platform, ensuring high test accuracy and fast speed.

II. Main Technical Specifications

(1) Power supply voltage: AC 220V ±10%

(2) Power supply frequency: 50Hz/60Hz ±1%

(3) Measurement range: Capacitance (5pF–200pF)

Relative permittivity (1.000–30.000)

Dielectric dissipation factor (0.00001–100)

(4) DC resistivity: 2.5 MΩm–20 TΩm

(5) Measurement accuracy: Relative permittivity ±(1–10)% of reading

Dielectric dissipation factor ±(5% of reading ±0.0002)

DC resistivity ±10% of reading

(6) Resolution: Capacitance 0.01pF

Relative permittivity 0.001

Dielectric dissipation factor 0.00001

(7) Temperature measurement range: 40–120°C

(8) Temperature measurement error: ±0.5°C

(9) AC test voltage: 200–2200V, continuously adjustable, frequency 50Hz

(10) DC test voltage: 0–500V, continuously adjustable

(11) Power consumption: 500W

(12) Dimensions: 460mm × 370mm × 330mm

(13) Total weight: 25Kg