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Automatic analysis device for checking differential protection CT (Current Transformer) wiring correctness of three-winding conventional transformer

An automatic analysis device and differential protection technology, applied in emergency protection circuit devices, measuring devices, instruments, etc., can solve the problems of high staff requirements, time-consuming and labor-intensive differential protection lines, and reduce the technical level requirements, wiring analysis The effect of simple work and strong reliability

Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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AI Technical Summary

Problems solved by technology

[0013] In order to solve the situation that it is time-consuming and labor-intensive to judge the wiring error of the differential protection line under manual conditions, and the situation of high requirements for the staff is high, the utility model provides a power differential protection system with high reliability in judgment and analysis, safe and simple use, and convenient operation. Wiring Analysis Devices in Protective Lines

Method used

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Examples

Experimental program
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Embodiment Construction

[0028] The utility model provides an automatic analysis device for checking the correctness of the CT connection of the three-winding conventional transformer differential protection CT. The specific implementation of the utility model is:

[0029] The components and functions of this applicable new model are as follows:

[0030] AC voltage / current sampling circuit: It is mainly composed of transformer / current clamp, I / V converter, and programmable amplifier. To electrically isolate the measured signal from the converted signal, the transformer can also be replaced by a resistor. The I / V converter is used to convert the current signal output by the transformer into a voltage signal; the programmable amplifier is composed of an amplifier and a digital potentiometer, and is used to amplify the input signal to meet the calculation accuracy requirements after A / D conversion.

[0031] A / D Converter: Converts the analog signal output by the programmable amplifier into a digital sig...

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Abstract

The invention relates to an automatic analysis device for checking differential protection CT (Current Transformer) wiring correctness of a three-winding conventional transformer. In the invention, each phase of the winding transformer has three windings, and after one winding is connected to an alternating current power supply, the other two windings induce different potentials, so that the transformer is used for a load requiring two different voltage levels. A power plant and a power substation usually provide three different levels of voltages, thus the three-winding transformer can be more widely applied in the power system. The device has the advantages of simpleness of operation, safety and reliability and ensures that the power differential protection loop wiring analysis work is simplified, and a result can be automatically analyzed and given out only through simple measurement, so that the requirements on the technical levels of staff are greatly reduced.

Description

technical field [0001] The utility model relates to an automatic analysis device for checking the differential protection of a conventional transformer, in particular to an automatic analysis device for checking the correctness of the CT connection of the differential protection of a three-winding conventional transformer. Background technique [0002] Transformer differential protection is the main protection of the transformer. As the differential protection of the main protection of the transformer, the correct action rate is always hovering at 50% to 60%. Differential protection is the most concerned issue of electric power units. Misoperation of differential protection is very detrimental to the safety of the transformer and the stable operation of the system. [0003] Each phase of the three-winding transformer has three windings. When one winding is connected to the AC power supply, the other two windings will induce different potentials. This transformer is used for ...

Claims

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Application Information

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IPC IPC(8): G01R31/06H02H7/045
Inventor 穆明建
Owner 西安爱邦电气有限公司
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