基于高耦合电抗器的500 kV限流器限流特性等效试验

基于高耦合电抗器的500 kV限流器在限流状态下的阻抗较大，而由于试验室电源电压有限，限流状态下的试验电流远小于额定短路电流，因此500 kV限流器在额定短路工况下的限流特性试验和动稳定性考核试验无法直接进行。针对上述问题，提出了一种间接验证限流器限流特性的等效试验方法。通过设计降低阻抗参数的比例缩小样机，在试验室条件下进行全电流的比例缩小样机间接试验，同时结合试验室内500 kV限流器比例缩小样机的低电压试验和500 kV限流器接入实际系统的高电压人工短路试验，综合验证500 kV限流器的限流能力。研究结果表明，500 kV限流器在额定短路工况下的限流幅度满足设计要求，所设计试验方法具有良好的等价性。

Equivalent test of current limiting characteristics of 500 kV current limiter based on high coupling reactor

The 500 kV current limiter based on the high coupling reactor has a larger impedance under the current limiting state. Due to the limited power supply voltage in the laboratory, the test current under the current limiting state is far less than the rated short circuit current. So, the current limiting characteristic test and dynamic stability assessment test under the rated short circuit condition of 500 kV current limiter cannot be carried out directly. To solve the above problems, an equivalent test method is proposed to indirectly verify the current limiting characteristics of the current limiter. By designing a scaled down prototype with reduced impedance parameters, the indirect test of scaled down the prototype with full current is carried out in the laboratory. At the same time, combined with the low voltage test of the 500 kV current limiter scaled down prototype in the laboratory and the high voltage artificial short circuit test of the 500 kV current limiter connected to the actual system, the current limiting capacity of the 500 kV current limiter are comprehensively verified. The results show that the current limiting amplitude of 500 kV current limiter under rated short circuit conditions meets the design requirements, and the designed test method has good equivalence.