Frequently Asked Questions about Salt Densitometer

1. Why measure the density of the salt on the surface of the insulator?
A: The significance of measuring the equivalent salt density of insulators is mainly to prevent pollution flashovers or provide a reference basis for creepage specific distances for new power grids.

2. How does measuring salt density play a role in preventing pollution flashovers?

A: Measuring the salt density on the surface of insulators does not prevent pollution flashovers, but it does have practical guidance. It can guide whether it is necessary to clean or replace the insulator string. In the past, when the salt density was not measured, the insulator strings of the line were usually cleaned once a year, which was too frequent in areas with lighter pollution, wasting human resources. However, the places with heavy pollution may be less than once a year, which is not conducive to the prevention of pollution flashovers. Therefore, the salt density of the line insulator needs to be measured to determine the appropriate frequency of cleaning.

3. The relationship between creepage specific distance and salt density?

Answer: The appropriate creepage ratio is mainly considered from three aspects, the voltage level, pollution level and construction cost of the transmission line. The relationship between creepage specific distance and voltage level and pollution level is shown in the table below.

Pollution

grade

Creepage distance (cm / kv)

Transmission line

Power plant, substation

220kv or less 330

330 kv or less

220 kv or less

330 kv or less

0

1.39 (1.60)

1.45 (1.60)

/

/

â… 

1.39 ~ 1.74

(1.60 ~ 2.00)

1.45 ~ 1.82

(1.60 ~ 2.00)

1.60

(1.84)

1.60

(1.76)

â…¡

1.74 ~ 2.17

(2.00 ~ 2.50)

1.82 ~ 2.27

(2.00 ~ 2.50)

2.00

(2.30)

2.00

(2.20)

â…¢

2.17 ~ 2.78

(2.50 ~ 3.20)

2.27 ~ 2.91

(2.50 ~ 3.20)

2.50

(2.88)

2.50

(2.75)

â…£

2.783.30

(3.20 ~ 3.80)

2.91 ~ 3.45

(3.20 ~ 3.80)

3.10

(3.57)

3.10

(3.14)

The salt density is measured to determine the pollution level of the area. When the pollution level is low, the creepage distance can be appropriately reduced, that is, the length of the insulator can be reduced, which can save construction costs and reduce line dancing. In the highly polluted area, the creepage ratio should be increased accordingly, that is, the length of the insulator string should be increased to effectively avoid pollution flashover.

4. Can the salt density be measured when the transmission line is online?
Answer: No. High voltage hazards cannot be sampled during power transmission, so salt density cannot be measured.

5. Why is the product called "direct reading" salt density meter?

Answer: The direct reading means that the salt density value can be read directly, which is mainly distinguished from the conductivity meter. The direct-reading salt density meter is a special instrument for measuring the salt density on the surface of the insulator, and can also measure the conductivity of the solution. The conductivity meter is a special instrument for measuring the conductivity of a solution. It is incorrect and dishonest for some businesses to use conductivity as a salt densitometer.

6. What equipment does the gray density meter have?
Answer: The main equipment includes a high-precision balance, a drying oven, a vacuum suction filter, and other accessories include special gauze, beaker, funnel, etc.