Introduction to Variable Frequency Series Resonance: It consists of a variable frequency power supply, an isolation transformer (also known as an excitation transformer), a reactor, and a capacitive voltage divider. The capacitor and reactor of the test sample form a series resonant connection; The voltage divider is connected in parallel to the test sample to measure the resonant voltage on the test sample and provide an overvoltage protection signal; The frequency modulation power output is coupled to the series resonant circuit through an excitation transformer, providing excitation power for series resonance.
1. Principle of series resonance withstand voltage test device
The series resonant withstand voltage test device is a testing method that uses a series resonant circuit to achieve high voltage output. The basic principle is to use a transformer to raise the low voltage to the high voltage value that needs to be tested, and output the high-frequency signal to the tested equipment through a series resonant circuit for testing.
2. Application of series resonance withstand voltage test device
The series resonant withstand voltage test device is widely used for insulation performance testing of various high-voltage equipment in power systems. For example, transformers, circuit breakers, transformers and other equipment need to undergo withstand voltage testing to ensure their safe and reliable operation.
In addition, the series resonant withstand voltage test device can also be used to study characteristics such as capacitance and dielectric loss. By changing parameters such as testing frequency and load size, the insulation performance data of the tested equipment under different conditions can be obtained, providing reference for equipment design and selection.
3. Problems and Solutions of Series Resonant Voltage Endurance Test Device
① Accuracy issue:
Due to the resonant effect of series resonant circuits on specific frequencies, test results may be affected by factors such as test frequency and load size. In order to improve testing accuracy, appropriate testing parameters can be selected based on the characteristics of the tested equipment, and data accuracy can be improved through multiple repeated tests.
② Security issues:
Due to the high testing voltage, if the testing equipment and personnel are not adequately protected, it may cause harm to personnel and equipment. In order to ensure testing safety, it is necessary to strictly comply with relevant safety regulations and equip professional protective equipment during the testing process.
③ Equipment cost issue:
The series resonance withstand voltage test device requires the use of professional testing instruments and equipment, which is costly. To reduce costs, testing can be conducted through leasing or sharing equipment.
Conclusion:
The series resonant withstand voltage test device is a widely used insulation performance testing method for high-voltage equipment in power systems. Its simple principle, high reliability, and good data accuracy have made it widely used in the power system. However, there are also issues of accuracy, safety, and cost that need to be carefully considered and addressed in practical applications.
The ZCVF-A series variable frequency series resonant withstand voltage test device adopts the method of adjusting the power supply frequency to achieve resonance between the reactor and the tested capacitor, thereby obtaining high voltage and high current on the tested object. Due to its low required power supply, light weight and small size, it has been widely praised and applied at home and abroad, and is a new method and trend of high voltage testing. This device is mainly designed for AC withstand voltage testing of cross-linked cables, hydroelectric generators, main transformers, busbars, GIS, etc. It has a wide range of applications and is an ideal withstand voltage equipment for high-voltage testing departments and power installation and maintenance engineering units at the local, municipal, and county levels. The equipment mainly consists of a variable frequency control power supply, an excitation transformer, a reactor, a capacitive voltage divider, and a compensation capacitor (optional).
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
