A test device for power frequency parameters of cables based on pxi system

Abstract

The invention relates to a cable power frequency parameter testing device based on a PXI system. The cable power frequency parameter testing device is powered by being connected with a three-phase power supply, is connected with a cable and is mounted in a movable vehicle body. The cable power frequency parameter testing device comprises a three-phase voltage regulator, a three-phase transformer, a PXI test console, a far-end testing circuit, a voltage measuring line and a current measuring line. The input end of the three-phase voltage regulator is connected with the three-phase power supply, the output end of the three-phase voltage regulator is connected with the three-phase transformer, the output end of the three-phase transformer is connected with the input end of the far-end testing circuit, the far-end testing circuit is arranged on the cable, the output end of the far-end testing circuit is respectively connected with the voltage measuring line and the current measuring line, the voltage measuring line and the current measuring line are both connected with the PXI test console, and the PXI test console is respectively in both-way connection with the three-phase voltage regulator and the three-phase transformer. Compared with the prior art, the cable power frequency parameter testing device has the advantages of achieving integrated operation of program control and measurement, being high in integration level and the like.

Description

technical field [0001] The invention relates to a cable power frequency parameter test device, in particular to a cable power frequency parameter test device based on a PXI system. Background technique [0002] With the continuous development of my country's electric power industry and the continuous expansion of installed capacity, the functions and testing techniques of the original high-voltage test equipment should also be improved accordingly. Traditionally, the voltage source is applied to the cable by manually configuring the step-down transformer, which not only increases the workload, but also cannot obtain suitable parameters by loading an appropriate power supply, and its application is limited. [0003] Before the new and rebuilt high-voltage transmission lines are put into operation, in addition to checking the line insulation and checking the phase, the power frequency parameter detection of the cable should also be carried out to obtain the basic parameters of...

AI Technical Summary

Problems solved by technology

[0004] 1) At present, when the electric power department measures the power frequency parameters of the line on site, since there is no ideal test instrument, it needs a practical high-power three-phase transformer and a voltage regulator. After applying the power frequency voltage to the line under test, With the help of discrete pointer measuring meters such as ammeters, voltmeters, and power meters, it is necessary to manually read the measurement data many times asynchronously, and obtain the values ​​of each parameter after corresponding calculations, which requires a large amount of manual work.

[0005] 2) Although some have used special digital measuring instruments or line parameter testers, when the line is long, the required power frequency test power supply capacity is still large; and the test equipment using power frequency power supply for testing is heavy , large, many, complex wiring, resulting in inconvenient cable test operation and movement

[0006] 3) Traditionally used operation boxes or consoles are heavy in design, and the structure requires a lot of steel and copper materials

[0008] Chinese patent 201310593496.3 discloses an intelligent control device for measuring positive-sequence parameters and zero-sequence parameters of high-voltage transmission lines. This invention includes a CPU module, a control signal optocoupler isolation circuit, a relay drive circuit, a contactor control circuit, and an interpersonal interaction system. Disadvantages such as poor system scalability and simple functions

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