Impact current generating device for testing lightning surges

Abstract

The invention discloses an impact current generating device for testing lightning surges. The device comprises a multi-waveform switching module for providing impact currents, a pneumatic execution module and a state feedback mechanism, wherein the pneumatic execution module comprises an air cylinder and a solenoid valve which is arranged between the air cylinder and an air source; and the multi-waveform switching module comprises a plurality of capacitors, harmonic resistor units and switch groups. Respective upper copper plates of the switch groups in a discharge circuit are fixed on a piston rod of the air cylinder, and movable touch blocks are arranged on the lower surface of the upper copper plate; respective static touch blocks of the switch groups are fixed on a base through a hemispherical rod, gaps are left between the static touch blocks and the base, and a hemispherical face at the upper end of the hemispherical rod is embedded in grooves on the lower surfaces of the static touch blocks. The state feedback mechanism comprises a connection rod and a travel switch. One end of the connection rod is placed under the upper copper plates and is higher than a plane where the static touch blocks are in, and the other end of the connection rod is mounted on the travel switch. By means of the impact current generating device, the contact adhesion and burning under large instantaneous currents is prevented, the contact performance is good, and the surface point contact or surface line contact does not exist.

Description

technical field [0001] The invention relates to the technical field of converting power input into surge power output, in particular to an impulse current generator for lightning surge testing. Background technique [0002] The simulated lightning strike surge current test system, also known as the impulse current generator, forms a large current through the instantaneous discharge of the energy storage capacitor, and conducts simulated lightning strike tests on lightning protection devices and devices such as SPDs, varistors, and lightning protection boxes, so that Verify whether these devices can absorb and suppress the large current and overvoltage caused by lightning, and can also be used to test and verify the anti-interference ability of power systems and electronic products in the environment of lightning strikes; the device can also be used Applied to other scientific research analysis, such as electromagnetic pulse protection and other fields. The existing technolo...

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Problems solved by technology

[0004] 1. The problem of switch withstand voltage: the main circuit part of the impulse current generator (capacitors, wave-modulating resistors, etc.) works in a high-voltage environment, and the general charging voltage is above 60kV. Usually, the electrical switches used cannot achieve such a high voltage.

[0006] 3. The switch must have a reliable feedback signal: in a high-voltage environment, any electrical switch will be broken down, damaged, or even high-voltage is passed into the control, resulting in paralysis of the control

However, if there is only the control signal of the switch without feedback, the system will not be able to judge the operating state of the switch, which is a very dangerous problem in the operation of high-voltage equipment. For example, in the 8 / 20μs state, due to some reasons, one of them If the switch is damaged, it should be in the open state to connect the capacitors in series, but at this time the switch is closed and the capacitors are connected in parallel, so the charging process is still charged in series, that is, the actual 17kV capacitor is charged at a voltage of 60kV. At this time Capacitors will definitely break down or even explode due to the inability to reach the withstand voltage

Therefore, the withstand voltage problem of the feedback signal must be solved

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