HZJD-2 Transformer Oil Tan Delta And Resistivity Tester

HZJD-2 Transformer Oil Tan Delta And Resistivity Tester

I. Overview

The HZJD-2 transformer oil dielectric loss and resistivity tester is designed for measuring the dielectric dissipation factor and DC resistivity of insulating oil and other insulating liquids. The instrument features an integrated structure, combining the test cell, temperature controller, temperature sensor, dielectric loss test bridge, AC test power supply, standard capacitor, high resistance meter, DC high voltage source, and other major components into a single unit.

II. Technical data

III.Panel Description and Operation Matters Needing Attention

Panel description

Fig.1 Operating Panel

Fig.2 Top panel

Fig.3 Back panel

oil cup technical standards

The test cell used of three-electrode structure in line with the national standard of GB/T5654-2007, with electrode gap spacing 2mm, can eliminate the effects of stray capacitance and reducing leakage on the dielectric loss test results.

(1)1Distance between high voltage and low voltage 2mm

(2) Dry cell capacitance 60±5PF

(3) Maximum test voltage (power frequency) 2000V

(4) Dry cell dielectric loss tan δ＜1×10-4

(5) Liquid capacity about 40ml

(6) Electrode material Stainless steel

(7) Volume 70mm (D) × 120mm (H)

3,Loading and taking out the test cell

⑴ Loading the test cell：Put the oil cup into the instrument furnace smoothly, ensure that the bottom contact of the oil cup is good, and then connect the test line, the test probe is inserted into the test sample cup.

⑵ Taking out the test cell：After the test line is removed, the oil cup can be taken out..

4,Dismantling and assembling the test cell's electrode

The inner electrode can be removed directly from the oil cup

Attention：Inner electrode is very precision components, when you take out and load it, actions must be slow and steady. Do not collide between the internal and external electrode in case of damaging the surface and causing the entire test cell scrapped.

5,Loading oil sample

Remove the inner electrode, pour the oil sample 40mL into the oil cup, and take care not to entrap bubbles in the oil as much as possible.

The inner electrode is then loaded into the oil cup and needs to be stationary for more than 15 minutes so that the bubbles can be completely discharged before testing.

Try.

6,Cleaning the test cell

This step is important for the cleaning of the oil cup before measurement. Because insulating oil has a very sensitive reaction to very small pollution. The following methodological elements must therefore be strictly followed.

Method 1:

(1) Complete removal of oil cup electrodes;

(2) Wash with neutral soap or detergent. Abrasive particles and friction actions should not damage the electrode surface;

(3) Wash the electrodes several times with clean water;

(4) Soak parts with anhydrous alcohol;

(5) After the electrode is cleaned, the surfaces of the electrode components are cleaned with silk fabrics, and care is taken to place the parts in a clean container without contamination of the surface with dust and moisture;

(6) Place the parts in an oven around 100 °C and dry them.

Method 2:

(1) Take the electrode cup apart(see the diagram of the oil cup).

(2) Thoroughly cleaning all parts of the oil cup with chemically pure petroleum ether and benzene.

(3) Wash the oil cup again with acetone, and then rinse it with neutral detergent.

Use 5 % sodium phosphate distilled water solution to boil for 5 minutes, and then wash with distilled water several times.

Wash all parts several times with distilled water.

(6) Dry the parts in an oven with a temperature of 105 to 110 °C for 60 to 90 minutes.

(7) After the parts are washed, they are assembled when the temperature drops to room temperature.

Method 3: Ultrasonic cleaning method

(1) Open the oil cup.

(2) Wash all parts with solvent.

(3) Using soapy water to oscillate all parts for 20 minutes in an ultrasonic cleaner; Remove parts, with tap water and distilled water cleaning; We're oscillating with distilled water for 20 minutes.

Method 4: Solvent cleaning method

(1) Open the oil cup.

(2) Rinse all parts with a solvent and replace the secondary solvent.

(3) Wash all parts with acetone first and then with tap water. Then wash with distilled water.

(4) Dry the parts in an oven with a temperature of 105 to 110 °C for 60 to 90 minutes.

When testing a group of similar liquid samples but not used, we can use the same test cell which doesn't need intermediate washing, as long as the last test sample has better performance than the specified value of the measuring,. If the performance of the tested sample is inferior to the measuring sample, the test cell must be cleaned before you make the next test.

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