Full-automatic measuring device of load tank

Abstract

The invention relates to a full-automatic measuring device of a load tank, which is composed of a controllable current source, a controllable voltage source, a microprocessor, a protective resistor, a commutation circuit, high-precise current transformer (CT) and potential transformer (PT) and a load tank regulating mechanism. According to the existing normal operating principle for measuring theload tank, the invention adopts the method of automatically adjusting the output value of the load tank to automatically control and adjust the rotary switch or the dial switch of the load tank, and replaces manual regulation and switchover; and thus, load tank verification process does not need manual intervention and can be automatically finished within short time, thus reducing manual input and inconvenience brought by operation, and greatly improving working efficiency.

Description

technical field

[0001] The invention relates to a load box full-automatic measuring device, which belongs to the technical field of detection and calibration of instruments and meters in the electric power industry. Background technique

[0002] The load box is a measuring device that provides the necessary load value for the verification or calibration test of the power transformer to complete the detection of the transformer error. In order to ensure the accuracy of the transformer detection error, the load box must meet the allowable error stipulated by the state. The load box is divided into two types: voltage load box and current load box. In order to improve the measurement accuracy, the current domestic transformer load box verification work basically uses the load box automatic measuring instrument, which provides current and measures the terminal voltage value of the current load box, Or provide voltage and measure the current value of the voltage load box to achiev...

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