Taking high-voltage thyristor switched capacitor (TSC) reactive power compensation device as a conventional high-voltage reactive power compensation device is widely used in high-voltage areas. But because the thyristor is turned on completely, valve terminal voltage is zero, which cannot be taken from the damping circuit and be used to trigger thyristors, so self-power supply optoelectronic trigger circuit has been a hot research topic to overcome the difficulties. In order to solve this problem, our research group independently developed a set of device based on self-power supply photoelectric trigger 10 kV high-voltage TSC to achieve self-power supplying of the thyristor trigger circuit through delaying a certain angle. But TSC is different from TCR when there is bound to cause a surge current due to the impact of the firing angle delay according to du/dt, causing the trigger pulse disorder. Therefore, in order to reduce surge current, it must be configured with a reactor in actual use. This paper analyzes the relationship between TSC trigger pulse delay angle and reactor and the harmonic content through the theoretical and simulation.