Glass insulator salt spray test

The glass insulator salt spray test method generally indicates coastal pollution in nature, and can also indicate industrial pollution, such as the case of thin layer pollution and moisture. The droplet size and distribution of the mist should be similar to the typical droplets of nature.
Characteristics of the salt spray method:
(1) A film containing an aqueous solution of sodium chloride can be cast on the surface of the insulator during the test.
(2) It is not necessary to apply a contaminated layer to the insulator separately and one by one.
(3) The formation of the mist can be easily automated. The salt on the surface of the insulator can be continuously replenished or the uneven dry salt layer can be uniformly wetted during the test, so the test state is easy to control.
(4) The equipment required for the test is simpler than other test methods, but requires a corrosion-resistant, effectively sealed room that does not allow salt spray to escape.
(5) The test preparation time is short, and the test period is relatively long.
(6) The results obtained in the laboratory are in good agreement with the results in the natural environment.
The salt spray solution of the salt spray test method is prepared by using sodium chloride and tap water according to the required salinity, and the salt solution is atomized by a compressed air flow, and the salt spray is sprayed through the nozzle. The test was started when the ceramic insulator was wetted to saturation. When applying voltage, the preliminary test is carried out by the lifting method, and then the tolerance test is performed later. Specific requirements are as follows:
A preliminary test was carried out by the lifting method. The insulator is applied with a test voltage for 20 min under the test salinity; if it is not flashover, the voltage is stepped up by 10% test voltage every 5 min until flashover. After flashover, reapply the voltage and raise it as fast as possible to 90% of the previously obtained flashover voltage, then increase it by 5% of the flashover voltage every 5 minutes until flashover. The final boosting process should be Repeat 6 times, each time the voltage is rapidly increased to 90% of the flashover voltage obtained last time, and then stepped up to the flashover with a step of 5% every 5 minutes. After 8 flashovers, the mist was removed, the insulator was washed with tap water, and the tolerance test was performed as soon as possible.
After the preliminary test is completed, the test sample is added with a given test voltage, the salt solution pump and the air compressor are actuated, and a series of tests are carried out according to the specified salinity. If no flashover occurs, then each test is performed. The duration should be th. When no flashover occurred during the three consecutive tests, the insulator was considered to have withstood. If only one flashover occurs, the fourth test shall be carried out, and no flashover will occur, and the composite insulator is considered to have passed the test.
If the purpose of the test is to determine that the insulator is tolerant to the specified salinity value, then: 1 If the total number of flashovers at any salinity reaches 2, no further tests should be performed at the same or higher salinity. 2 If the total number of tolerances reaches 3, no further tests should be performed at the same or lower salinity.
If the purpose of the study is to determine the resistance characteristics of the insulator, the maximum withstand voltage or 50% withstand voltage should be measured at a given test salinity. When measuring the maximum withstand voltage, each test should be selected in several voltage levels, each of these voltage levels should be approximately 1.05 times lower than the lower one.
Each test is carried out according to the specified procedure, ie: 1 if the total number of flashovers at any voltage reaches 2, no further tests should be performed at the same or higher voltage levels; 2 such as tolerance at any voltage The total number of times reaches 3 and no further tests should be performed at the same or lower voltage levels. When measuring 50% withstand voltage, the insulator shall be subjected to at least 10 "effective" tests at a given test contamination level, and the applied voltage level at each test shall be changed by the lift method. The voltage level difference should be approximately 10% of the expected 50% withstand voltage.

The article is transferred from the official website of FRP insulators:
Http://
Http://
Recommended reading:
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://
Http://

UCT Series Bearing

Product Name	ASAHI Pillow Block Bearing UCT 205 bearing UCT205
Brand	WST / NSK / NTN / KOYO / ASAHI / OEM
Model Number	UCT205
Material	Chrome steel / Stainless Steel
Precision	P0, P6, P5, or as requested
Vibration	ZV1, ZV2, ZV3, or as requested
Clearance	C0,C2,C3, or as requested
Features	Compact structure, sensitive rotation and easy maintenance etc.
Quality standard	ISO9001:2000/ SGS
Quality Control Process	1.Assembly
	2.Windage test
	3.Cleaning
	4.Rotary test
	5.Greasing and gland
	6.Noise inspection
	7.Appearance inspection
	8.Rust prevention
	9.Product packaging
Application	Bearings for agricultural machinery, bearings for food processing and packaging, bearings for mining machinery, bearings for construction machinery