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Test device for three-phase alternating current phase sequence simulation test source

A three-phase alternating current, simulation test technology, applied in the direction of phase sequence/synchronization indication, etc., can solve the problems of high cost, inconvenient operation, complex structure, etc.

Inactive Publication Date: 2019-01-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a test device for a three-phase alternating current phase sequence simulation test source to solve the problems of high cost, complex structure and inconvenient operation in the prior art

Method used

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  • Test device for three-phase alternating current phase sequence simulation test source

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Embodiment 1

[0027] According to an embodiment of the present invention, a test device for a three-phase AC phase sequence simulation test source is provided, such as figure 1As shown, it is a schematic structural diagram of an embodiment of a test device for a three-phase AC phase sequence simulation test source provided in Embodiment 1 of the present invention. The test device of the three-phase AC phase sequence simulation test source includes a single-chip microcomputer, three-way D / A converter, three-way low-pass filter, three-way signal operation circuit, three-way power amplifier circuit, three-way step-up transformer and relay; , drive three-way D / A converters to generate three-way DC bias sinusoidal signals with a preset frequency and a phase difference of 120°; each D / A converter converts digital quantities to analog voltages according to the data instructions of the single-chip microcomputer Convert to generate the corresponding DC bias sinusoidal signal waveform; each low-pass ...

Embodiment 2

[0041] According to the embodiment of the present invention, a kind of practical application is provided, the example that adopts the test device of the three-phase alternating current phase sequence simulation test source of this embodiment to carry out the test, the test device diagram of this embodiment can also refer to figure 1 ,

[0042] Such as figure 1 As shown, the test device of the three-phase AC phase sequence simulation test source provided by the embodiment of the present invention includes: a main control single-chip microcomputer; a human-computer interaction control panel; a three-way D / A converter; a three-way low-pass filter; a three-way signal Operation circuit; three-way power amplifying circuit; three sets of step-up transformers; three single-contact normally open relays; two double-contact normally open and normally closed relays; and power supply.

[0043] The test device of the three-phase alternating current phase sequence simulation test source of ...

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Abstract

The invention discloses a test device for a three-phase alternating current phase sequence simulation test source. A single-chip microcomputer drives a three-way D / A converter to generate three pathsof direct current bias sinusoidal signals with a preset frequency and a phase difference of 120 degrees. The single-chip microcomputer controls a first relay, a second relay, a third relay, a fourth relay, and a fifth relay to be in a power-off state or in a power-on closed state so as to perform a positive phase sequence simulation action, or perform a reverse phase sequence simulation action, orperform a simulation action without a phase A, or perform a simulation action without a phase B, or perform a simulation action without a phase C. According to the scheme of the invention, the defects that the prior art has high cost and a complex structure and one test device cannot simulate the fault states of various phase sequences can be overcome, low cost and a simple structure can be achieved, and the fault state of various phase sequences can be simulated by controlling the on and off states of the relays.

Description

technical field [0001] The invention relates to the technical field of phase sequence detection, in particular to a test device for a three-phase alternating current phase sequence simulation test source. Background technique [0002] At present, the production, transmission and distribution of electric energy generally adopt a symmetrical three-phase system. The phase sequence of the three-phase AC power supply has a direct impact on some equipment: only devices with the same phase sequence can work in parallel; if the phase sequence is different, the rotation direction of the three-phase motor will be different; if the phase sequence is wrong, the measurement of the watt-hour meter will be different. Inaccurate, it is particularly important to predetermine the phase sequence of the three-phase power supply. [0003] Therefore, many phase sequence detection devices have appeared, and most industrial control equipment working with three-phase power supply will also be equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/18
CPCG01R29/18
Inventor 罗勇肖婧
Owner JINAN UNIVERSITY
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