Microcomputer relay protection test system based on measurement modularization

Abstract

The invention discloses a microcomputer relay protection test system based on measurement modularization. The microcomputer relay protection test system comprises a microcomputer relay protection device, a host, a power generator and an electric quantity collector. In the host, all devices in an electric power system are modeled and then connected with each other. After that, the operation simulation is carried out and faulty electric quantity data are obtained. The faulty electric quantity data are processed through adopting the analog tracking algorithm. The data are sent to the data receiving end of the power generator, and then the power generator reads the data and outputs pseudo-fault electric quantity data. The data are sent to the microcomputer relay protection device. The electricquantity collector conducts real-time sampling on the data of the power generator and the data after being subjected to the microcomputer relay protection device, and transmits data to the host afterthe sampling operation. The host processes the data and displays the data on a display screen. In conclusion, the invention provides an algorithm capable of simulating the electric quantity signals of a power grid, a method for determining the working precision of the microcomputer relay protection device based on the feedback idea and a set of relay protection device test system.

Description

technical field [0001] The invention belongs to the technical field of microcomputer relay protection experiments and tests, and in particular relates to a microcomputer relay protection test system based on measurement modularization. Background technique [0002] When the power system fails or the abnormal working conditions of abnormal operation, the relay protection device can often quickly cut off the connection between the line and the power supply, thereby minimizing the impact of the fault on the power system. Traditional relay protection devices are large, bulky, and not flexible enough. With the development of microelectronics technology, microcomputer relay protection devices developed on the basis of microcomputer systems have been developed and applied on a large scale; in order to calibrate microcomputer relay protection devices For testing work, a microcomputer relay protection tester is generally required. After configuring the parameters of the tester as req...

AI Technical Summary

Problems solved by technology

Traditional relay protection devices are large, bulky, and not flexible enough. With the development of microelectronics technology, microcomputer relay protection devices developed on the basis of microcomputer systems have been developed and applied on a large scale; in order to calibrate microcomputer relay protection devices For testing work, a microcomputer relay protection tester is generally required. After configuring the parameters of the tester as required, its internal power generator will generate an alternating current whose effective value varies with time. In this way, the microcomputer relay Check the stage I protection and stage II protection of the protection device

[0003] However, the above method of using a microcomputer relay protection tester to verify the microcomputer relay protection device has the following defects: First, the microcomputer relay protection tester cannot track the power grid electricity, that is, the output of the microcomputer relay protection tester The alternating power of the system cannot be completely similar to the change curve of the grid power in the actual situation. It only matches the protection action power of the microcomputer relay protection device, while ignoring the pressure of the power change that the microcomputer relay protection device bears in the actual power grid. ; Secondly, under the current technology, there is no complete set of proof rules to prove that when the microcomputer relay protection device triggers the protection action, the power it bears is the power of the set parameters, and the verification of the microcomputer relay protection device is only One-way behavior, there is no feedback and comparison of related verification results; moreover, when the current microcomputer relay protection tester calibrates the microcomputer relay protection device, it cannot intuitively provide protection to the staff and learners. The power change curve increases the difficulty of troubleshooting and the difficulty of learning the theory

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