Insulator Dust Density Tester

The HM-3000 Insulator Dust Density Tester is a complete set of "ash density" measuring device developed by our company in accordance with the needs of our country's power grid anti-pollution flashover work and in line with the new standards for the classification of grid pollution levels. The HM-3000 insulator ash density tester is a complete measuring device. It includes components such as precision electronic balance, blast drying device, filtering acceleration device and measuring accessories. The entire device is easy to operate and accurate in measurement.

Filter acceleration device

Precision electronic balance

Blast drying device

1. The filtration acceleration device has mature technology, convenient use and high efficiency. With multiple taps, multiple filtering processes can be realized at one time. Use water circulation device instead of oil circulation pump, which is more convenient to use and has low failure rate;

2. The blast drying device adopts German technology with advanced air duct; the fan has low noise and stable performance;

3. Microcomputer intelligent control, after setting the temperature, the meter will judge the power required for heating and display the heating status, the temperature control is accurate and stable;

4. Adjustable air inlet to control the temperature and gas discharge in the box;

5. The precision electronic balance has multiple functions such as digital multi-point linear correction, drift correction, power-on self-check and tare;

6. With supporting calculation software, the calculation is convenient and the result is more accurate.

1. The accuracy of the balance: 0.1mg;

2. Maximum weighing: 200g;

3. Temperature control range: room temperature +10℃～250℃;

4. Temperature resolution: 1℃;

5. Temperature fluctuation: ±1℃;

6. Temperature uniformity: ±1℃;

7. Flow of suction filtration: 60L/Min;

8. The maximum vacuum degree of suction filtration: 0.098Mpa;

9. Single head suction volume of suction filter: 10L/min;

10. Number of suction heads: 2;

11. Power supply voltage: 220±10%;

12. Ambient temperature: 5-40℃;

13. Relative humidity: 85%.

The operation steps are roughly divided into weighing, dissolving, filtering, drying, weighing and calculation. Take out the suction filter bottle, funnel and hose, install the funnel on the suction filter bottle (pay attention to the tightness), connect the hose to the inlet of the quick filter, prepare the beaker and filter paper; install the electronic balance, adjust the level and adjust the foot It is stable on the desktop, and it is turned on 60 minutes in advance for preheating; the constant temperature drying box is installed.

The first step: weighing

Before the dissolution operation, the weight of the filter paper must be weighed and recorded.

Adjust the balance: Before turning on the balance, observe whether the blisters in the level gauge at the back of the balance are located in the center of the ring, otherwise adjust the balance with the anchor bolts, turn left to raise, right turn to lower, turn on the power, press the "on" button to turn on To ensure the accuracy of the balance, please warm up for more than 60 minutes. After the balance is stable, 0.00000g appears. Perform the "calibration" operation as needed. Place the filter paper in the center of the weighing pan. After g appears, it is the weight of the filter paper.

Step 2: Dissolve

1. Select the insulator

The charged insulator string should take the second insulator from the top, the middle one, and the second from the bottom three insulators; the non-charged insulator string should take the three insulators at any position.

Tip: Only measure one piece of insulator at a time, and finally calculate the average value with the measurement results of three pieces. At the same time, in order to avoid contamination loss, the operator should not touch the insulating surface of the insulator when disassembling and handling the insulator.

2. Configure solvent

It is recommended to use deionized water or distilled water. If the site conditions are limited, pure water or mineral water can be used. (The conductivity is less than 100 is appropriate)

When the amount of water taken is too small, the soluble matter in the dirt will not be completely dissolved. It is recommended to refer to one of the following two methods for water intake.

Method 1: For single-piece ordinary suspension insulators, it is recommended to use 300ml of water. When the surface area of the tested insulator (including the suspension insulator and the unit skirt section of the post insulator) is different from that of the ordinary suspension insulator, the water consumption can be appropriately increased or decreased according to the area size. The specific water consumption is as follows:

Table 1 The relationship between the surface area of the insulator and the water consumption for salt density measurement

Method 2: Calculate the total water consumption based on 0.2ml of water per square centimeter of surface area.

Put the above solvent into a clean beaker.

3. Wipe dirty and dissolve the surface

It is recommended to use clean filter paper, cotton balls or gauze to wipe the surface of the insulator. You need to weigh it before wiping, and record the result with a pen or computer.

Taking gauze and distilled water as an example, the wiping steps are as follows:

a) Weigh the dry gauze and record the result;

b) Dip the gauze into the beaker, squeeze the water dry with clean tweezers (or wear disposable gloves) and take it out;

c) Wipe the insulator with wet gauze until the surface of the insulator is basically clean;

d) After the wiping and dissolution steps are completed, the solution in the beaker is ready to be filtered.

Notice:

1. When using tweezers to squeeze the wet gauze out of the water, it is advisable not to drip when the wet gauze is taken out to ensure that the solution is not lost during wiping, otherwise the test results will be biased;

2. Use only one piece of gauze as much as possible, because the use of multiple pieces of gauze will increase the measurement error, and may exceed the range of the balance in the final weighing.

Step 3: Filter

There are two kinds of filtration methods, one is conventional filtration, and the other is filtration using a vacuum suction filter.

a) Routine filtration

Prepare equipment: experiment rack, funnel, beaker, glass rod, filter paper.

Refer to the chemistry experiment textbook for filtering steps and precautions.

The advantages of this filtering method: easy access to equipment and easy operation. Disadvantages: Long filtration time; a certain amount of soluble matter will remain in the filter paper and ash, which will make the result too large.

b) Filter acceleration device filter

Prepare equipment: filter acceleration device, funnel, catheter, suction filter bottle.

Refer to the operation instructions of the vacuum filter for the filtration steps (see Appendix D for details).

The advantages of this filtering method: the filtering time is short, the soluble residue is small, and it is also shortened

Drying time. Disadvantages: high cost of equipment.

The fourth step: drying

Fold the filtered filter paper into 90° and place it flat on the shelf of the drying oven, and close the door of the oven. Turn on the power switch, the instrument starts heating, and the temperature control instrument starts to display the temperature of the studio.

The temperature of the drying box is 130°C when it leaves the factory, and the drying time is 30-50 minutes. The temperature and duration can be reset according to the actual situation. It is recommended that the temperature should not exceed 150°C, otherwise it may cause the filter paper to burn. (See Appendix C for details)

After finishing the work, just turn off the power switch.

Step 5: Weighing

Weigh the dried filter paper and ash together. (See Appendix E for details on the use of balances)

a) Level adjustment: Before turning on the balance, observe whether the blisters in the level gauge at the rear of the balance are located in the center of the ring, otherwise, adjust the level with the anchor bolts of the balance.

b) Turn on the power, press the〔ON/OFF〕key, turn on the balance, and warm up for 30 minutes.

c) For balance calibration, press "Tare" first, then put in the weight, and then remove the weight. If the displayed value is not 0, press "Tare" again.

f) Insert the filter paper and ash, and when g appears, it is the weight of the filter paper and ash.

g) After weighing, press the〔ON/OFF〕key to turn off the machine.

Step 6: Calculation

Use the following formula to calculate:

The density of ash attached to the surface of the insulator is NSDD=1000 (Ms-Mf)/S.

Note: The unit of NSDD is mg/cm2 (milligrams per square centimeter),

Ms represents the weight of the filter paper and ash weighed together, the unit is g,

Mf represents the mass of filter paper and wipes before filtering, the unit is g,

S represents the surface area of the insulator in cm2.

1. The distance between the drying oven and the wall should be 20-30cm;

2. No items should be stacked on the drying box;

3. The balance should be placed in a vibration-free position, as level as possible, and should be handled gently when weighing. Cannot weigh items beyond the maximum weighing range;

4. Please do not use cleaning agents containing solvents or abrasives, which will damage the film of the operating platform;

5. Please be careful not to let liquid penetrate into the balance;

6. Please do not repair, maintain or replace any parts of the balance.