Novel intelligent tramegger with self-discharge function

Abstract

The invention relates to a novel intelligent tramegger with a self-discharge function. The novel intelligent tramegger is characterized by comprising a DC voltage output unit, a sampling unit, a CPU control unit, an A/D (Analog/Digital) conversion unit, a first D/A (Digital/Analog) conversion unit, a second D/A conversion unit, a delay relay and a discharge resistor, wherein the delay relay and the discharge resistor are connected in series between a circuit terminal L and a ground terminal E and form a discharge loop together with a article to be tested and the magnetotelluric impedance; the sampling unit is connected to two ends of the discharge resistor; the sampling result passes through the A/D conversion unit and then is sent to the CPU control unit; and the CPU control unit is connected with the DC high-voltage output unit and the control terminal of the delay relay. The novel intelligent tramegger makes the best use of the digital signal processing technology and the singlechip control technology, effectively overcomes the shortcomings that a traditional digital tramegger can not achieve self-discharge and is low in intelligent degree, promotes the measurement technical level of insulating resistance, and has the advantages of safety and reliability in detection, high testing accuracy, simplicity and convenience in operation, strong anti-interference ability and the like.

Description

technical field [0001] The invention belongs to the technical field of insulation resistance measurement, in particular to a novel intelligent megger with automatic discharge function. Background technique [0002] The insulation resistance measurement of electrical equipment is an important means to check the insulation status of electrical equipment and ensure the personal safety of operators. Due to the existence of the insulating medium absorption phenomenon, it is also required to measure the absorption ratio and polarization index for large-capacity tested products, and in order to prevent the residual charge in the tested product from reducing or even damaging the insulation performance of electrical equipment, after each insulation resistance test It should be fully discharged. [0003] At present, the digital megohmmeter is the most commonly used portable instrument for measuring insulation resistance. This kind of megohmmeter needs to be manually discharged after ...

AI Technical Summary

Problems solved by technology

[0003] At present, the digital megohmmeter is the most commonly used portable instrument for measuring insulation resistance. This kind of megohmmeter needs to be manually discharged after the test. Therefore, there is a risk of insufficient discharge or even no discharge operation.

In addition, the traditional digital megohmmeter usually uses a fixed-time output method when testing the absorption ratio and polarization index, which has a low degree of automation and intelligence, which greatly reduces work efficiency. For example, when the insulation resistance exceeds 10GΩ, the absorption The ratio and polarization index can only be used as a reference; when the insulation resistance value does not change with the pressurization time, the absorption ratio and polarization index will not change, so it is not suitable to use the fixed time output mode

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