Mutual inductor field wireless calibration instrument for 750kV substation

Abstract

The invention discloses a mutual inductor field wireless calibration instrument for a 750kV substation. The mutual inductor field wireless calibration instrument comprises a main machine and an auxiliary machine, which are connected in a wireless mode and generate synchronous signals; the main machine is used for conditioning, collecting and carrying out A / D (analog / digital) conversion on the secondary signal of a standard mutual inductor, and transmitting a synchronous signal to the auxiliary machine; the main machine is also used for performing data operation processing on a digital signal of the standard mutual inductor, obtained from the A / D conversion, and a digital signal of a tested mutual inductor, transmitted by the auxiliary machine in the wireless mode, obtaining the comparison value and phase difference of the digital signals compared with each other, and displaying the comparison value and the phase difference; and the auxiliary machine is used for conditioning, collecting and carrying out A / D conversion on the secondary signal of the tested mutual inductor, and transmitting the digital signal of the tested mutual inductor after being subjected to A / D conversion to the main machine in the wireless mode after receiving the synchronous signal transmitted by the main machine. The mutual inductor field wireless calibration instrument for the 750kV substation can overcome the defects of great environmental influence, high fault rate and high error and the like in the prior art and realize the advantages of small environmental influence, high reliability and low error.

Description

technical field [0001] The invention relates to the technical field of error detection of transformer substation transformers, in particular to a field wireless calibrator for transformer transformers of 750kV substations. Background technique [0002] At present, the verification of transformer errors in 750KV substations is generally composed of a transformer calibrator, a standard transformer, a load box, and a large-capacity power supply. Ratio standard current ( / voltage) transformer, booster ( / voltage) device, current ( / voltage) load box, primary connecting wire and secondary connecting wire, the primary side of the standard transformer and the tested transformer are given by the power supply The same amount on the primary side, compare the secondary side of the standard transformer with the secondary side of the tested transformer to obtain the difference between the two secondary currents ( / voltages), and measure the error of the tested transformer by the transformer ...

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Problems solved by technology

[0003] However, in the on-site verification of 750KV substations, due to the harsh on-site environment, there will be improper wiring, complicated wiring, and repeated inspections, and the surface conditions on the site will cause damage to the wires, resulting in distortion of the transmission signal and affecting the error data. If the standard transformer The space distance from the tested transformer is long, and longer secondary wires are required, which introduces additional errors in the secondary voltage drop, resulting in distortion of the transformer error data

[0004] In the process of realizing the present invention, the inventor found that there are at least some defects in the prior art, such as large influence by the environment, high failure rate and large error

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