Switching value signal processing method

Abstract

The invention discloses a switching value signal processing method. An analog output signal of an optical coupler in a switching value signal processing device is connected to one path of Analog to Digital Converter ADC input end connected with a central processing unit CPU; actions corresponding to different direct current rated voltages input by the optical coupler and a return threshold value are pre-stored in an nonvolatile memory; and the CPU performs analog sampling on an output signal of the optical coupler, and the obtained sampling value is compared with the preset rated voltage action and the return threshold value input by the optical coupler in the nonvolatile memory so as to obtain the actual state of the switching value, namely the switching value is 1 or 0. The analog output signal of the optical coupler and an output signal of a temperature measuring chip for measuring the working temperature of the device cabinet are respectively connected to ADC input pins of the CPU; and the actions of different direct current rated voltage and the return threshold value are pre-stored in the nonvolatile memory E2PROM, and the obtained sampling value is compared with the regulated preset action and the return threshold value of the E2PROM, and the actual switching state is obtained.

Description

technical field [0001] The invention relates to a processing method of a switching value signal and a device using the method, which is suitable for protection control and automation devices requiring switching value input acquisition in power system substation automation and industrial control automation. Background technique [0002] The input of the switching value of the substation integrated automation system mainly includes the switching value input circuit (switching input circuit), circuit breaker, auxiliary contact of the isolating switch, etc. These circuit breakers and isolating switches are in the high-voltage circuit and have strong electromagnetic interference capability. Therefore, before collecting the digital input signal, isolation processing is generally required. The isolation processing method widely used at present is generally realized by optocoupler. Optical isolation. [0003] The traditional open-in optocoupler isolation technology is to keep the e...

AI Technical Summary

Problems solved by technology

[0005] ●Power system users generally require that the operating voltage of the switching signal input should meet the operating range of 55% to 70%. The traditional switching output method is judged by the digital level 0 / 1 output by the optocoupler, which is difficult to achieve All channels meet this requirement

[0006] ●Industrial control occasions such as substations have different requirements for the input DC working voltage level, and it is often necessary to configure input acquisition boards with different voltage levels, and the optocoupler switching input with low voltage level is often burned out due to wrong access to high voltage. Very inconvenient to maintain

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