Test device for primary through-flow, secondary pressurization and excitation small current

Abstract

The invention relates to a test device for primary through-flow, secondary pressurization and excitation small current. The test device comprises a power supply input end; the power input end is sequentially connected with a three-phase voltage regulator, a first three-phase alternating-current output air switch and a three-phase converter to form a first output module. The power supply input endis sequentially connected with a three-phase transformer and a second three-phase alternating current output air switch to form a second output module; the three-phase converter, the current transformer and the alternating current sampling meter are connected in sequence to form a primary up-flow display module; the fuse and the on-voltage change-over switch are sequentially connected to the alternating-current sampling meter to form a secondary pressurization display module; the first output module is communicated with the primary up-flow display module, and the second output module is communicated with the secondary pressurization display module to perform primary through-flow secondary pressurization test inspection. The test device for primary through-flow secondary pressurization andexcitation small current can comprehensively and reliably check the relationship between secondary current and voltage, can realize a current and voltage boosting test which is convenient to assembleand disassemble and simple to operate, and can also consider an excitation small current test.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and relates to a test device for checking the primary flow, secondary pressurization and exciting small current of a substation or a substation facility. Background technique [0002] With the continuous development and improvement of my country's power system, the methods and requirements of power construction work are also constantly improving and improving. In order to check the polarity of the secondary current and the correctness of the relay protection in the substation and other power facilities more comprehensively and efficiently, it is necessary to check all the current transformers of the whole substation before putting into operation after the single system inspection is completed. Ratio, the polarity of the secondary current and other secondary circuits do a comprehensive final inspection. At present, substations with higher voltage levels generally use a boost and current test ...

AI Technical Summary

Problems solved by technology

[0003] The advantage of a step-up boost is that it directly simulates the normal operation of the substation. The test range is comprehensive and the test results are clear. The disadvantage is that the test device is very bulky and the wiring is cumbersome. High voltage will be generated during the test and more safety measures need to be taken.

The whole test process is time-consuming and inconvenient to carry, requiring high technical requirements for the participants, so it is widely used in substations with higher voltage levels; and if the secondary boost test is used, the disadvantage is that the current polarity and transformation ratio cannot be checked. It cannot fully reflect the relationship between the secondary current and voltage of the entire substation

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