Alternating current and direct current universal real-available-value voltage transmitter

Abstract

The invention relates to an alternating current and direct current universal real-available-value voltage transmitter. The alternating current and direct current universal real-available-value voltage transmitter comprises a voltage signal sampling module, a real available value conversion module, a signal isolation module, a signal conditioning module, a signal transmitting output module, a preceding power module and a subsequent power module, wherein the preceding power module is used for providing operating voltages for the voltage signal sampling module, the real available value conversion module and the input side of the signal isolation module, and the subsequent power module is used for providing operating voltages for the output side of the signal isolation module, the signal conditioning module and the signal transmitting output module. Voltage signals to be measured are connected with the input end of the signal isolation module via the voltage signal sampling module and the real available value conversion module, and the output end of the signal isolation module is connected with a voltage transmitting output connection terminal via the signal conditioning module and the signal transmitting output module. The alternating current and direct current universal real-available-value voltage transmitter is capable of measuring broadband voltage amplitude values, particularly measuring low-frequency voltage signals at an electric generator start stage, is capable of achieving overall monitoring of an electric generator in a process from start to stable operation, and is universal in alternating-current and direct-current signals, accurate in measurement and wide in application field.

Description

technical field [0001] The invention relates to a transmitter, in particular to a voltage true effective value transmitter for AC and DC. Background technique [0002] At present, conventional AC voltage transmitters often use voltage transformers for signal sampling, and conventional voltage transformers have limitations on the frequency of sampling signals. If the frequency is too low or too high, they cannot work normally. Due to these reasons, conventional The input signal frequency of the AC voltage transmitter is generally limited to 45Hz to 55Hz. However, it takes a certain amount of time for the generator to start to run stably. After the generator is started, the turbine speed will gradually increase from zero, and the corresponding voltage frequency will also gradually increase until it finally stabilizes to about 50Hz. Therefore, when the generator is just started, the voltage frequency is very low, even less than 5Hz, so the conventional voltage transmitter cann...

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Problems solved by technology

[0003] The invention mainly solves the problem that the input signal voltage frequency of the original voltage transmitter is limited to a narrow frequency range, and the low-frequency voltage signal in the starting stage of the generator cannot be measured, and the process of the generator from starting to stable operation cannot be fully monitored. Technical problem: To provide a common voltage true effective value transmitter for AC and DC, which can measure voltage signals with a wide range of frequency changes, especially low-frequency voltage signals at the start-up stage of the generator, and can control the generator from start-up to stabilization. The process of work is fully monitored, and the AC and DC signals are common

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