What Factory Acceptance Tests (FAT) Need to Be Performed for Glass Insulator

Many customers such as Turkey, Tanzania, Vietnam, Iraq, Kazakhstan etc focus on the question whether Jiangxi Huayao Electric Co., Ltd. can perform factory acceptance test (FAT). T he answer is of course we can.

As a leading domestic manufacturer specializing in glass insulators, Jiangxi Huayao Electric Co., Ltd. is capable of carrying out a full range of factory acceptance tests, and all test items can be performed independently in our in - house testing laboratory.

To strictly control product quality and meet high - end international supply standards, our company has invested several million US dollars to introduce a complete set of advanced international testing equipment. All test procedures are implemented in strict accordance with the latest international standard IEC 60383- 1 :2023. Standardized and formal performance tests are conducted for the full range of glass insulators to eliminate potential quality risks, ensure all technical performances meet requirements, and satisfy the application needs of various high - voltage transmission projects.

There are universal material testing machine, visible corona and radio interference testing equipment, impulse voltage testing machine, temperature cycling test device, electric blast drying oven, axial and radial offset inspection device, power-frequency voltage test device, mechanical load testing device, locking-pin test fixture, zinc-layer thickness measuring instrument, etc. in our laboratory. All equipment holds calibration certificates within valid period.

Sampling rules and procedures for sample tests as per IEC60383 2023

For the sample tests, three groups are used, E1, E2 and E3. When more than 10 000 insulators are concerned, they shall be divided into an optimum number of equal lots comprising between 2 000 and 10 000 insulators.

results of the tests shall be evaluated separately for each lot. For N ≤ 300 the number of samples is set to zero.

Note: E3 sample group is not required for glass insulators.

Sample sizes for sample tests

Lot size ( N)

Sample size

N ≤300

300<N≤2000

2000<N≤5000

5000<N≤10000

What factory acceptance tests (FAT) will be peformed for glass insulator in Jiangxi Huayao Electric Co.,ltd? We accept third‑party test agents including SGS, Intertek and BV to carry out FAT. Customers are also welcome to conduct on‑site tests at our factory. Following is the factory acceptance tests photos in Jiangxi Huayao Electric Co.,ltd laboratory:

Verification of the dimensions

The results of Verification of Displacements

Locking system test

Temperature cycling test

Mechanical failing load test

Power frequency withstand test

Zinc Coating test

Thermal shock test

Power frequency wet withstand voltage

Power frequency dry withstand voltage

The complete set of test items that can be completed in our factory are listed below:

No.

Test Item

Test detail

Test quantity

Diameter, Spacing, Creepage distance, Coupling size, coupling gauging

E1+E2

Offset: the axial offset is not more than 0.04D mm(D is the nominal disk diameter of the insulator, mm);

the radial offset is not more than 0.03D mm;

When a maximum load of 500N is applied, the locking pin cannot be dislodged

Temperature cycle test

Test product is subjected to hot water 89℃,cold water 19 ℃,temperature difference 70℃, cold and hot water staying for 15min after three times of cold and hot cycle, through 1min power frequency voltage withstand test, test product is in good condition, qualified.

Apply a stipulated failing load to the insulator, and the product does not break down.

Power frequency puncture withstand test

Apply a stipulated voltage to the insulator, and the product does not break down.

Galvanized test

Minimum values of single sample 70μm；

Average values of all samples 85μm。

Pin：Minimum values of single sample 70μm；

The ability of glass insulators to resist thermal shock shall be tested through a test with a temperature difference of 100℃, and the product must not be damaged

The test shall be carried out on clean and dry insulator units , without artificial rain. The sample shall be mounted in service position. Apply sinusoidal power-frequency voltage, raise the voltage at a uniform rate up to the specified withstand voltage value, maintain this voltage for 60 seconds. No puncture or flashover shall occur during the whole test duration.

Power frequency dry flashover voltage

The insulator unit shall be clean and dry, mounted in service position without artificial rain. Sinusoidal power-frequency voltage shall be increased uniformly from zero until surface flashover occurs. Record the flashover voltage value, then reduce voltage to zero immediately. Perform 5 valid successive tests on the same sample. The average value shall be corrected to standard atmospheric conditions. Puncture of insulator body is not permitted.

The insulator unit shall be mounted in service position. Standard artificial rain at 45° shall be applied with specified precipitation rate and water conductivity. Pre-rain for 15 minutes prior to voltage application. Sinusoidal power-frequency voltage shall be raised uniformly up to the specified wet withstand voltage value and maintained for 60 seconds, while artificial rain keeps running throughout the whole test. No puncture or flashover shall occur during the test duration.

Power frequency wet flashover voltage

The insulator unit shall be mounted in service position. Standard artificial rain at 45° shall be applied with specified precipitation rate and water conductivity. Pre-rain for 15 minutes before voltage application, and keep spraying throughout the whole test. Sinusoidal power-frequency voltage shall be increased uniformly from zero until surface flashover occurs. Record flashover voltage value and reduce voltage to zero immediately. Perform 5 valid successive tests on the same sample. The average value shall be corrected to standard atmospheric conditions. Puncture of insulator body is not permitted.

Radio interference test

The insulator unit complete with metal fittings shall be clean, dry and thermally balanced with test environment, mounted in service position. The preferred measuring frequency is 0.5 MHz. Background noise shall be sufficiently lower than measured RI level. Apply 110% of specified test voltage and maintain for minimum 5 minutes. Step-down the voltage to 30% of test voltage, then step-up back to specified test voltage and hold for 1 minute. Record radio-interference level in dB. The measured RIV value at specified test voltage shall not exceed the agreed limit.

Factory acceptance test aims to verify that glass insulators meet contract and IEC standard requirements by checking electrical, mechanical and dimensional performances, identify manufacturing defects before shipment and guarantee reliable service in power transmission projects.

All glass insulators manufactured by Jiangxi Huayao Electric Co., Ltd. are fully tested in strict accordance with the latest IEC 60383-1:2023 international standard. Comprehensive inspections covering dimensional accuracy, electrical performance and mechanical durability ensure stable and reliable quality for every delivered unit, providing solid safety guarantee for power grid operation.