The series resonance withstand voltage testing system has an important impact on future power equipment testing. The following is a detailed analysis:
1. Improve detection accuracy and reliability
The series resonant withstand voltage testing system can generate a continuous high-resolution frequency sine signal. By continuously adjusting the output frequency of the signal, it can meet the resonance requirements of the series system and perform more accurate withstand voltage testing on power equipment. For example, when conducting voltage withstand tests on power cables with a length of 1km and a rated voltage of 10kV, the design of a series resonant high voltage test system based on direct digital frequency synthesis technology meets the requirements of regulatory testing. This high-precision testing capability can better detect potential defects in power equipment, improving the reliability and safety of the equipment.
2. Reduce the capacity requirements for testing equipment
Traditional test transformers are bulky and require high-capacity power sources for conducting AC withstand voltage tests on large capacity power cables. The series resonance withstand voltage testing system adopts variable frequency series resonance technology, greatly reducing the capacity requirements of power testing equipment. In the 220kV cable withstand voltage test, the use of variable frequency series resonance technology successfully completed the test, proving the feasibility and effectiveness of this technology in long-distance high-voltage XLPE cable AC voltage testing. At the same time, it also reduced the capacity requirements of the testing equipment and improved the efficiency of the testing work.
3. Optimize the testing plan for long-distance high-voltage cables
With the rapid development of urban construction and the increasing demand for electricity, more and more long-distance, large section high-voltage cable lines are being used. Traditional single voltage withstand testing equipment cannot meet the capacitance requirements of cable lines for completion acceptance and handover testing. Therefore, an optimized series parallel connection method for frequency conversion multi resonance withstand voltage testing is proposed. Taking a variable frequency multi resonance withstand voltage testing system as an example, three domestic withstand voltage testing cases are presented. The results show that different connection schemes are the best in different testing scenarios, and the absolute error between the resonant frequency value and the calculated current value and the measured value is small. This proves that the optimization method can provide a low error withstand voltage testing scheme for long-distance high-voltage power cable lines.
4. Adapt to the testing needs of different types of power equipment
In high-voltage electrical equipment testing, series resonance can not only ensure the safety of the entire test, but also reduce the requirements for capacitance in the test. It is of great significance in the basic definition overview of high-voltage electrical equipment testing, analysis of its importance to the power system, and specific applications.
In the performance testing of high-speed train track cables, a high-performance variable frequency power supply is crucial for more accurate detection of cable insulation performance in voltage withstand testing equipment. By designing a variable frequency test power supply based on a DSP digital processor as the control core, a high-performance control core is provided for detecting the series withstand voltage test equipment of track cables. The power frequency three-phase 380V/50Hz AC is converted into the voltage value required for the withstand voltage test, completing the series resonance withstand voltage test.
5. Promote technological innovation and development
The continuous development and application of series resonance withstand voltage testing systems will promote innovation in related technologies. For example, in the design of variable frequency power supplies, the use of sine pulse width modulation (SPWM) technology control strategy simplifies the main circuit of the variable frequency power supply and improves the accuracy, stability, and reliability of the control circuit.
In summary, the series resonant withstand voltage testing system has multiple positive impacts on future power equipment testing, and will provide strong guarantees for the reliability and stability of the power system.
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
