Bus shielding layer potential monitoring device

Abstract

The invention provides a bus shielding layer potential monitoring device comprising a resistive voltage division unit, an instrument amplifier unit, a programmable amplifier unit, a reference voltage unit and an AD conversion unit. A first end of the resistive voltage division unit is connected to a bus shielding layer, and the resistive voltage division unit includes multiple serially-connected resistors and is used for dividing the voltage of the bus shielding layer. The input end of the instrument amplifier unit is connected to a second end of the resistive voltage division unit, and the instrument amplifier unit outputs a voltage division signal after filtering and carrying out gain doubling on the voltage division signal. The input end of the programmable amplifier unit is connected to the output end of the instrument amplifier, and the programmable amplifier unit outputs an output signal of the instrument amplifier after carrying out 1-200 times of gaining on the output signal. The reference voltage unit simultaneously provides bias voltage for the instrument amplifier unit and the programmable amplifier unit. The AD conversion unit is connected to the output end of the programmable amplifier and converts an output analog potential value into a digital potential value to facilitate following control. The bus shielding layer potential monitoring device can be used for monitoring the potential value between the shielding layer and the ground in real time, the electromagnetic interference of a cable bus to electronic equipment is reduced, the occurrence of shielding layer burning-down, electronic equipment mal-operation and the like is avoided, and the safety of related personnel and equipment is secured.

Description

technical field [0001] The invention relates to a potential monitoring system, in particular to a bus shielding layer potential monitoring system. Background technique [0002] With the expansion of the power system, the increase of the voltage level, and the increase of the unit capacity, electronic equipment such as computers have been widely used in power plant production monitoring and control. Moreover, the frequency band of electronic equipment is increasingly widened, the power is gradually increased, and the sensitivity requirements are gradually increased. The working environment of electronic equipment and the monitoring object itself is a strong alternating electromagnetic field, which is a big source of interference. In such an electromagnetic environment, electronic devices will inevitably be subject to electromagnetic interference caused by electrostatic induction, electromagnetic coupling, potential rise of the ground wire, and interference voltage generated ...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a bus shielding layer potential monitoring system for real-time monitoring of the cable bus shielding layer potential, to solve the problem that the cable busbar has a non-zero potential on the busbar shielding layer. Electromagnetic interference, shielding layer burning, related personnel life and equipment safety are affected, etc.

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