A device and method for realizing simulated DC feedback failure of rail traffic

Abstract

The invention relates to a device for realizing simulation of rail transit direct-current feed faults. The invention is characterized in that the device consists of an embedded system, a D / A conversion module, a translation amplification module, a V / I conversion module and an output interface, wherein, the embedded system is connected with the D / A conversion module; the D / A conversion module is respectively connected with the translation amplification module and the V / I conversion module, which are respectively connected with the output interface. The invention simulates production of each current-change waveform of short-circuit fault, overload, etc. of a rail transit direct-current feed line to validate protective functions of a direct-current protection device, e.g. transient current protection, time-delayed over-current protection, thermal inverse time protection, near-area short-circuit rising rate protection, and far-area short-circuit rising rate protection. The resolution of output waveforms is 100 us, and according to that, a validation standard and a device able to simulate field short circuits are proposed to perform validation of the direct-current protection device.

Description

technical field [0001] The present invention relates to a device and method for simulating rail transit DC feeder faults, in particular to a device for simulating various fault waveforms of rail transit DC traction feeder systems for detecting the protection performance of DC protection devices, which belongs to the simulation technology field. Background technique [0002] With the rapid development of the rail transit system, the DC traction power supply system has been more and more widely used, so that the DC traction network line feed system protection device has been widely used in the DC traction power supply system. [0003] Due to the high cost of inspection and charge, it is difficult to carry out dynamic simulation test acceptance of high-current short-circuit protection for each DC protection device when it leaves the factory, and DC protection devices used in rail transit traction substations. In order to test the correctness of the protection function of the de...

AI Technical Summary

Problems solved by technology

[0004] There is no test equipment dedicated to the protection function of DC protection devices in rail transit traction substations on the market. The following two methods are being used in the field environment: one is to simulate the current change when a DC short circuit occurs by establishing an analog circuit, but this The current waveform data generated by this method is not clear, it is difficult to set the protection value of the protection device, and the equipment is huge and not portable, and it is inconvenient to use on site; the other is the combination of arbitrary waveform generator and voltage-current transmitter on the market. Arbitrary waveform generators are generally not specifically designed for the generation of short-circuit current waveforms, and the entire short-circuit current waveform can be drawn and saved for output only by point method, which is very inconvenient in application. For different short-circuit conditions, it has to be corresponding to it Drawing waveforms, unable to intelligently generate waveforms, greatly increases the workload of debuggers

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