Hydrolysis and transformer oil resistance tests are crucial for maintaining the performance, safety, and longevity of magnet wires in various applications. And the necessity of testing the hydrolysis and transformer oil resistance of magnet wire lies in several key factors:
Firstly, it ensures reliability and safety, as magnet wires may be exposed to moisture and oil in real-world applications. These tests prevent insulation failure, which could lead to short circuits or other safety hazards.
Secondly, they extend the lifespan of the wires, reducing maintenance and replacement costs by ensuring durability under harsh conditions.
Thirdly, these tests help in complying with industry standards, ensuring the wires are suitable and safe for various applications.
Additionally, they enhance product quality by identifying and correcting potential defects.
Finally, they ensure the wires perform effectively in diverse environments, such as transformers and motors, where they may encounter moisture or oil.
Analysis of Magnet Wire Hydrolysis Resistance Test Standards
1. What is Hydrolysis Resistance of Electromagnetic Wire
The hydrolysis resistance of the electromagnetic wire refers to whether the wire is prone to hydrolysis reactions in an environment with high humidity, resulting in a reduction in electrical performance. The hydrolysis resistance of the wire is closely related to the wire quality and service life, and is also an important indicator of whether the wire can operate stably for a long time.
2. About The Significance of Hydrolysis Resistance Test
Hydrolysis resistance testing can be used to evaluate the stability and reliability of wires. Through the simulation of the laboratory environment, the electrical performance of the wire in an environment with high humidity can be evaluated in a short period of time, providing data support for the wire maintenance and repair. In addition, hydrolysis resistance testing can also help manufacturers control the production process and material selection, improving production efficiency and product quality.
3. Hydrolysis Resistance Test Standards
Common winding wire hydrolysis resistance test standards include IEC 61196-1, JIS G 3521, ASTM B 117, etc., among which ASTM B 117 is the most common standard.
4. Hydrolysis Resistance Test Method
Common testing methods for hydrolysis resistance of wires include salt spray test, wind and rain test, constant temperature and humidity test, etc. Among them, the salt spray test is one of the most common methods. Its principle is to inject sodium chloride aqueous solution to generate salt spray with a concentration of 5% in a simulated marine environment to accelerate the hydrolysis reaction of the wire to evaluate the wire hydrolysis resistance.
5. Factors That Affect The Hydrolysis Resistance of Wires
The hydrolysis resistance of wires is affected by many factors, including oxide content, dopant content, impurity content, adhesion and thickness of the protective layer, etc. When the values of these factors are too high or too low, it is easy to cause the hydrolysis reaction of the wire to intensify.
6. Solution
Corresponding solutions can be taken according to the factors affecting the hydrolysis resistance of enameled wires. For example, strengthen the anti-oxidation treatment of wires, reduce the content of impurities and dopants, increase the adhesion and thickness of the protective layer, etc. Through these methods, the hydrolysis resistance and stability of the wire can be improved, thereby extending the wire service life.
In short, the hydrolysis resistance of magnet wire is an important indicator of its quality and stability. Hydrolysis resistance testing can help evaluate the electrical performance of wires and provide data support for wires maintenance and repair. For magnet wire manufacturers and users, mastering the hydrolysis resistance test standards and methods and strengthening the governance and management of wires can improve product quality and service life and promote the healthy development of the industry.
Detailed Explanation of Enameled Wire Transformer Oil Resistance Test Standards
1. Oil Resistance Test Standards
The main oil resistance test standards for enameled wires include the following:
1) GB/T 2951.11-2008 “Conductor insulation and sheath, oil resistance test”
This standard applies to the insulation materials of electromagnetic wires. The oil resistance of the specimens is evaluated by immersing them in an oil pool.
2) GB/T 12528-2008 “Flame-retardant wires and cables”
This standard is applicable to the oil resistance test of electromagnetic wires. It requires that the oil resistance of the sample be evaluated by immersing the sample in an oil pool. The length of the sample must be 0.5m and the temperature in the oil pool must be maintained at 23±2°C.
3) UL1581-2001 “Standard Test Methods—Conductor Insulation and Sheathing—Part 11: Oil Resistance”
This standard is applicable to the oil resistance test of conductor insulation materials. It requires soaking the sample in oil at 101°C for 24 hours, and then wiping it with alcohol to check whether there are any cracks or deformations in the sample.
The above three standards can more accurately evaluate the oil resistance performance of wires in oily environments, and can be selected according to actual needs.
2. Oil Resistance Test Method
The test method of wires in oily environment mainly consists of the following three steps:
1) Preparing test specimens
Prepare a small piece of magnet wire material sample or a complete magnet wire sample, with a length of at least 1m, keeping the sample intact.
2) Soak the sample
Place the sample in a container filled with oil. The sample is required to be completely immersed in the oil. The soaking time is determined as needed.
3) Evaluate test results
After the sample is taken out, observe its appearance directly to check whether there is any deformation, surface damage or color change.
3. Oil Resistance Performance Evaluation Index
When evaluating the oil resistance of winding wires, the following indicators need to be considered:
1) Oil resistance evaluation
After testing the winding wire in an oily environment, judge its oil resistance by observing and evaluating its appearance changes, surface damage or color changes.
2) Tensile test
During the test process, each sample needs to be subjected to a tensile test to ensure that the wire can still maintain its stability and strength in an oily environment.
3) Electrical performance evaluation
After testing the cable in an oily environment, it is also necessary to consider whether the electrical performance of the wire has been damaged, such as conductivity and insulation.
