Multi-path analog loop and polarity calibration instrument

Abstract

The invention relates to a multi-path analog loop and polarity calibration instrument. The multi-path analog loop and polarity calibration instrument consists of a test main machine and a wireless extension, and is characterized in that the test main machine is provided with a main machine test wire, and the wireless extension is provided with a plurality of extension test wires; the main machine test wire of the test main machine is connected to the input end and the output end of a primary coil of a mutual inductor, each extension test wire of the wireless extension is respectively connected to a secondary loop cable of the mutual inductor to be introduced into each coil at the inlet of a measurement and control device, and the wireless extension and the test main machine are in wireless signal connection. The multi-path analog loop and polarity calibration instrument has the advantages of high integration level, convenient portability, simple operation, one-man operation and time and labor saving during testing, simultaneous inspection and testing for a plurality of coil loops can be completed at a time, calibration can be completed for the completeness of a multi-path analog loop and the correctness of polarity at a time, errors caused by wiring and transitional information contact for different persons are avoided, and safe operation of power supply units is guaranteed.

Description

technical field [0001] The invention relates to a polarity calibrator, in particular to a multi-channel analog loop polarity calibrator, which is applied to various wiring substations and distribution stations of electrified railways, local power supply systems, factories and mines and other occasions. Background technique [0002] Potential transformers (PT) and current transformers (CT) are important electrical equipment in power systems. They are responsible for the isolation between high and low voltage systems and the conversion of high voltage to low voltage. The wrong polarity of the transformer is prone to abnormal tripping and inaccurate measurement during equipment operation; therefore, whether its polarity and secondary wiring are correct or not has an impact on the normal operation of the protection, measurement, monitoring and other equipment of the system. extremely important. [0003] During new installation, overhaul of PT, CT or replacement of PT, CT second...

AI Technical Summary

Problems solved by technology

[0006] At present, most of the transformer calibrator is used on site to complete the test of excitation characteristics, ratio difference and angle difference, and polarity, but the purpose of this test is to confirm the performance of the transformer body and the correctness of the polarity. For the secondary connection The phase coordination check between line and voltage and current analog quantities is useless; in addition, there is a traditional manual "point polarity" polarity test method to check the correctness of PT and CT wiring. At least 2 groups of 4 people are required for the sex test method, and prior communication is required before the test. During the test, the two groups must use accurate language during the communication process. Any small mistake may cause a polarity error, which will bring unfavorable conditions to the operation of the equipment. estimated impact

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