Protection system of series reactor

Abstract

The invention discloses a protection system of a series reactor. The protection system comprises a capacitor, an electric reactor, a discharge coil, a lightning arrester, an isolation switch and a grounding knife-switch, wherein the discharge coil is connected with the capacitor in parallel, the capacitor is connected with the electric reactor in series, the lightning arrester is arranged at the joint of the capacitor and the electric reactor, the isolation switch is connected with the electric reactor, one end of the grounding knife-switch is arranged at the joint of the isolation switch and the electric reactor, the other end of the grounding knife-switch is grounded, the electric reactor comprises a first electric reactor and a second electric reactor, the first electric reactor is connected with a first current transformer in series, the second electric reactor is connected with a second current transformer in series, the first electric reactor and the first current transformer are connected and then connected with the second electric reactor and the second current transformer in parallel, and the first current transformer and the second current transformer are connected with a controller. The protection system has the advantages that effective detection of electric reactor turn-to-turn short circuit accidents is achieved, accident expansion is avoided, and safe operation of the series reactor can be guaranteed.

Description

technical field [0001] The invention relates to the technical field related to electric equipment, in particular to a protection system for series reactors. Background technique [0002] At present, in high-voltage reactive power compensation devices, in order to suppress harmonics and limit closing inrush current, it is necessary to connect series reactors in parallel capacitors. Series reactors are important equipment in reactive power compensation devices, but series reactors have long been in the unprotected It is often discovered that the reactor caught fire due to the expansion of the accident. In order to change this situation, GB50227-2008 provides special protection for setting series reactors. [0003] The special protection methods recommended by GB50227-2008 are: (1) Oil-immersed iron core is provided with gas protection; (2) A high-sensitivity smoke alarm is installed around the reactor - the effect is limited, and the safe operation of the reactor cannot be gua...

AI Technical Summary

Problems solved by technology

[0002] At present, in high-voltage reactive power compensation devices, in order to suppress harmonics and limit closing inrush current, it is necessary to connect series reactors in parallel capacitors. Series reactors are important equipment in reactive power compensation devices, but series reactors have long been in the unprotected It is often discovered that the reactor caught fire due to the expansion of the accident. In order to change this situation, GB50227-2008 provides special protection for setting series reactors.

[0003] The special protection methods recommended by GB50227-2008 are: (1) Oil-immersed iron core is provided with gas protection; (2) A high-sensitivity smoke alarm is installed around the reactor - the effect is limited, and the safe operation of the reactor cannot be guaranteed; (3) ) The two ends of the reactor are connected across the voltage transformer, and the terminal voltage protection is set----ineffective for the reactance rate less than 4.5%; the above methods have obvious shortcomings. Due to the current detection and protection methods are limited, the reactor cannot be detected in time Turn-to-turn insulation breakdown phenomenon

Therefore, in the existing reactive power compensation device, the series reactor is basically not equipped with any protection, which brings a huge safety hazard to the safe operation of the series reactor

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