Test method for characteristic parameters of conversion circuit of ultra-high voltage and ultra-high voltage DC circuit breakers
A technology of ultra-high voltage direct current and characteristic parameters, which is applied in the direction of circuit breaker testing, etc., can solve the problems that the time is not long and there is no test method for the characteristic parameters of the conversion circuit of high-voltage direct current circuit breakers, and achieve the purpose of enhancing the ability of DC arc extinguishing and current interruption Effect
Active Publication Date: 2015-09-02
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Problems solved by technology
[0004] Since the EHV and UHV DC transmission technologies have not been used in my country for a relatively long time, there is no clear requirement for the project in the handover and acceptance items of the converter stations of the EHV and UHV DC transmission projects in the power system, and there is no regulation for high voltage Test method for characteristic parameters of switching circuit of DC circuit breaker
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[0033] 1) see image 3 , when the circuit breaker under test is in the closed state, after safely grounding the transfer capacitor bank C, untie the drain terminal of the circuit breaker under test connected to the conversion circuit platform, and pass the untwisted drain wire through the Rogowski coil CT, Recover and tighten the terminal. That is, the connection line from the circuit breaker to the conversion circuit platform passes through the Rogowski coil CT.
[0034] The current sensor CT using the Rogowski coil avoids the problem of changing the characteristic parameters of the conversion circuit caused by the access current test device such as the shunt, the saturation defect of the electromagnetic current transformer, the temperature drift of the Hall sensor, the narrow precision response range and the time Disadvantage of requiring calibration.
[0035] 2) Test the characteristic parameters of the passive conversion circuit, see image 3 .
[0036] An external DC ...
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The invention discloses to a method for testing characteristic parameters of a conversion loop of a direct current circuit breaker with extra and ultra-high voltage, which relates to a method for testing the characteristic parameters of the conversion loop of a passive oscillation circuit and an active oscillation circuit of the direct current circuit breaker with the extra and ultra-high voltage. According to different charging voltage (passive) or different charging time (active) of a changeover condenser group, a wave form of the current I of the conversion loop, which is collected and obtained by operating the breaker, is operated, the frequency f and the decay time constant Tau of the conversion loop are respectively obtained, and finally, the characteristic parameters of the conversion loop within a certain range are obtained. The sum of the reactor inductance of the conversion loop (the conversion loop is provided, and a reactor is not provided), the condenser inductance and the line inductance forms the inductance L of the conversion loop, which is equal to 1 / (2*pi*f)<2>*C, and the damping resistance R of the conversion loop is equal to 2L / Tau.
Description
technical field [0001] The invention relates to a method for testing characteristic parameters of a high-voltage direct current circuit breaker in an electric power system, in particular to a method for testing characteristic parameters of a conversion circuit of an ultra-high voltage and ultra-high voltage direct current circuit breaker. Background technique [0002] The high-voltage DC circuit breaker for the DC field of the converter station of the ultra-high voltage DC transmission project is an important equipment for the DC field of the converter station, mainly including the neutral bus switch (NBS), the metal return switch (MRTB), and the earth return switch ( GRTS) and so on. They function as transfer switches and are mainly used for the conversion of various operating modes of the DC transmission system, such as grounding system conversion, fault handling, etc. Since the DC current has no natural zero-crossing point, the arc in the fracture is not easy to extingui...
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IPC IPC(8): G01R31/327
Inventor 李晶陈少卿肖伟
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST