PT intelligent blocking device and method for power line

Abstract

The invention discloses a PT intelligent blocking device and method for a power line and belongs to the technical field of blockers. The device comprises an internal integrated main body, a high-voltage relay and an intelligent control module. An intelligent control circuit is arranged in the intelligent control module; and the intelligent control circuit is composed of a single-chip microcomputerand a high-voltage relay control circuit part. The device and the method are scientific and reasonable, and usage is safe and convenient. According to theoretical calculation and actual testing, precision values of metering type PT, measurement type PT and power supply type PT are different, and capacitance values of the blockers which need to be connected in series are different. Therefore, at least three types of blockers with different capacitance values are needed to meet requirements; and the PT intelligent blocking device can control working states of the five high-voltage relays through the single-chip microcomputer according to different situations, the required capacitance values are achieved, the blockers with the different capacitance values do not need to be produced accordingto the different situations, PT does not need to be disconnected manually in an alternating current / direct current detection process, and normal operation of the line is not affected.

Description

technical field [0001] The invention relates to the technical field of blockers, in particular to a PT intelligent blocking device and method for power lines. Background technique [0002] Voltage transformer (abbreviated as PT) is a very important device on the power line. It is generally divided into metering PT, measurement PT, switching power supply PT, etc. Among them, metering PT has the highest accuracy requirement of 0.2 level; Among them, it is level 0.5; the switching operation power supply class PT has the lowest requirement, which is level 1.5. Due to its characteristics of blocking traffic and direct current, the online PT directly shorts the test DC voltage to the ground, so that the DC instrument cannot be boosted normally for testing. The current method is to disconnect the PT before testing, and then try to send the DC voltage. Not only is the work cumbersome, but the efficiency is extremely low, and it also affects the power consumption on the user side. T...

AI Technical Summary

Problems solved by technology

[0002] Voltage transformer (abbreviated as PT) is a very important device on the power line. It is generally divided into metering PT, measurement PT, switching power supply PT, etc. Among them, metering PT has the highest accuracy requirement of 0.2 level; Among them, it is level 0.5; the switching operation power supply class PT has the lowest requirement, which is level 1.5. Due to its characteristics of blocking traffic and direct current, the online PT directly shorts the test DC voltage to the ground, so that the DC instrument cannot be boosted normally for testing. The current method is to disconnect the PT before testing, and then try to send the DC voltage. Not only is the work cumbersome, but the efficiency is extremely low, and it also affects the power consumption on the user side. Therefore, it is urgent to study a PT intelligent blocking device and method for power lines to ensure that there is no need to artificially disconnect the PT during AC / DC detection. Without affecting the normal operation of the line

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