In the power system, the transformer, as an important measuring and protection equipment, plays an indispensable role. The core component of transformer, the iron core, its performance directly affects the accuracy and reliability of the whole equipment. The test of the induced voltage of the iron core is an important link to ensure the normal operation of the transformer. This paper will discuss the principle and method of the test and its significance in practical application.

The basic principles of iron cores

The core of the transformer is primarily made of a highly permeable material, and its function is to concentrate and enhance the magnetic flux through its coil. Core design and material selection are very important to the performance of the transformer. The saturation characteristics, loss characteristics and temperature characteristics of the iron core will directly affect the generation of induced voltage. Induced voltage refers to when the magnetic flux in the core changes, the electromotive force will be generated in the core, and this electromotive force is the basis of the output voltage of the transformer.

Test method overview

In the core induction voltage test, the following methods are usually used:

1. Transformer AC power supply test: By applying a certain frequency of AC power supply, observe the induced voltage change of the iron core. This method can effectively evaluate the response characteristics of iron cores at different frequencies.

2. Transformer DC power supply test: Although the DC power supply does not produce a changing magnetic flux, it can be used to test the DC resistance of the iron core, and then speculate its material characteristics.

3. Transformer short-circuit test: By short-circuiting the secondary side of the transformer, observe the current and voltage changes on the primary side. This test evaluates the performance of the core under high load conditions.

4. Transformer temperature rise test: Monitor the temperature rise of the iron core under long-term operating conditions to ensure its stability under high temperature environment.

Precautions during testing

In the induction voltage test, the operator needs to pay attention to the following aspects:

Equipment calibration: Ensure that the test equipment is strictly calibrated to avoid inaccurate test results due to instrument errors.

Environmental conditions: Factors such as temperature and humidity of the test environment will affect the test results, so it should be carried out in a stable environment.

Safety measures: Due to the high voltage and current involved in the testing process, the operator must follow safety procedures and wear the necessary protective equipment.

Application case analysis

In the test of inductance voltage of transformer core conducted by a power company, it is found that the inductance voltage of one transformer is obviously lower than the standard value. After further analysis, it was determined that the decrease in permeability was due to impurities in the core material. After replacing the core material, the performance of the transformer has been significantly improved, and the induced voltage has returned to the normal level. This case shows that regular induction voltage testing is important for equipment maintenance and failure prevention. With the continuous progress of science and technology, the design and test methods of transformers are also constantly evolving. In the future, testing technology based on artificial intelligence and big data analysis will gradually be applied to the performance evaluation of instrument transformers. Through real-time monitoring and data analysis, potential problems can be detected earlier, thereby improving the reliability and safety of the transformer.

In addition, the development of materials science will also promote the innovation of core materials. The application of new high-permeability magnetic materials will help to improve the performance of the transformer, reduce energy loss, and improve the overall efficiency of the power system. The test of inductance voltage of transformer core is an important step to ensure the safety and stability of power system. Through the scientific test method and rigorous operation process, the performance of the transformer can be effectively improved and the failure rate can be reduced. In the future, with the advancement of technology, the test and maintenance of transformers will be more intelligent and efficient.