Differential probe and non-contact voltage measuring device

Abstract

The invention provides a differential probe and a non-contact voltage measuring device. The differential probe is composed of two adjacent metal substrates in a circuit board, and the two metal substrates are separated by an insulating layer. Fixed capacitance Ca is formed between the two layers of metal substrates. The differential probe integrates two electrodes of the differential probe into the circuit board, and volume of the differential probe is reduced, and manufacturing cost of the differential probe is reduced. The non-contact voltage measuring device acquires an AC voltage signal ofa to-be-measured circuit through a capacity coupling non-contact method, and has good adaptability. An operation target is a single wire, the device is small in volume, and the device is easy to carry. Through two relay switches, the circuit has three kinds of topological structures. The number of components is few, and manufacturing cost is low, and the device is beneficial for mass production and application. Through a wireless transmission circuit, circuit voltage is uploaded to a cloud server, and circuit voltage data can be collected in a large-scale manner. The device has good practicability.

Description

technical field [0001] The invention relates to the field of voltage measurement, in particular to a differential probe and a non-contact voltage measurement device. Background technique [0002] Traditional differential probes are usually composed of two separate electrodes and transmit signals through wires. In non-contact voltage measurement application scenarios, the two electrodes need to be fixed with both hands, which is very inconvenient when working off the ground; or use a clip-on probe The electrodes are fixed, but the clip-on electrodes are bulky and inconvenient to carry; on the other hand, the cost of discrete differential probes is relatively high. [0003] The traditional contact meter first needs to destroy the insulation layer of the wire during installation, and the voltage value cannot be obtained at some measuring points where the insulation layer cannot be damaged. Therefore, a low-cost, easy-to-install, high-precision, and strong adaptability to the en...

AI Technical Summary

Problems solved by technology

[0002] Traditional differential probes are usually composed of two separate electrodes and transmit signals through wires. In non-contact voltage measurement application scenarios, the two electrodes need to be fixed with both hands, which is very inconvenient when working off the ground; or use a clip-on probe The electrodes are fixed, but the clip-on electrodes are bulky and inconvenient to carry; on the other hand, the cost of discrete differential probes is relatively high

[0003] The traditional contact meter first needs to destroy the insulation layer of the wire during installation, and the voltage value cannot be obtained at some measurement points where the insulation layer cannot be damaged. Therefore, a low-cost, easy-to-install, high-precision, and strong adaptability to the environment is urgently needed. Large-Scale Voltage Monitoring of Distribution Networks with Non-Contact Voltage Measuring Devices

[0004] Under the premise of not destroying the insulation layer of the wire, the thickness of the insulation layer of the line to be tested varies with the actual situation. Some traditional non-contact measurement methods with fixed parameters can only provide an estimated value with a large error and cannot be accurate. Measure the voltage value of the line under test

[0005] On the other hand, there are also some non-contact voltage measuring devices that measure the two wires of the zero line and the live line. The equipment is large in size and difficult to operate.

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