Test loop and method for super/extra-high voltage circuit breaker opening and closing paralleling reactor load

Abstract

The invention discloses a test loop and method for super / extra-high voltage circuit breaker opening and closing paralleling reactor load. The structure is simple, the design is rational, and the experimental requirement under the super / extra-high voltage can be satisfied. The test loop comprises a power part, a transformer bank, a major loop part and a load part which are connected successively. The power part comprises a short circuit surge generator G and a power-side impedance Ls. The transformer bank comprises two groups of transformers. The major loop part comprises a first auxiliary switch AB1, a second auxiliary switch AB2, a test object breaker TO, a current transformer I and a voltage transformer U. The load part comprises a high voltage reactor L, a frequency modulation capacitance C and a load loss resistance R. The frequency modulation capacitance C and the load loss resistance R are respectively parallelly-connected with the high voltage reactor L. A primary winding of each of the first group of the transformer and the second group of the transformer is connected with the short circuit surge generator G by the power-side impedance Ls.

Description

technical field [0001] The invention relates to the field of large-capacity testing of high-voltage circuit breakers, in particular to a test circuit and method for switching loads of combined reactors of super / ultra-high voltage circuit breakers. Background technique [0002] Shunt reactors are usually used to limit overvoltage when the grid is under light load. When the grid load is heavy, the shunt reactor must be completely or partially cut off to avoid excessive consumption of system inductive power. When the circuit breaker opens and closes the inductive current, the interaction between the fracture of the circuit breaker and the surrounding circuit usually produces a high-amplitude, high-frequency transient voltage, which poses a great threat to the power grid, especially for EHV / UHV circuit breakers, where the inductive opening and closing current is large , high re-ignition overvoltage. Due to the limitation of test capacity, domestic laboratories can only complet...

AI Technical Summary

Problems solved by technology

When the circuit breaker opens and closes the inductive current, the interaction between the fracture of the circuit breaker and the surrounding circuit usually produces a high-amplitude, high-frequency transient voltage, which poses a great threat to the power grid, especially for EHV / UHV circuit breakers, where the inductive opening and closing current is large , high restrike voltage

Due to the limitation of test capacity, domestic laboratories can only complete the load test of circuit breakers with rated voltage of 252kV and below, and cannot complete the test of parallel reactors with 550kV~1100kV EHV / UHV circuit breakers.

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