Portable microcomputer charging protection device and method

Abstract

The invention relates to a portable microcomputer charging protection device and a portable microcomputer charging protection method, and belongs to the field of electrical engineering and the automation of the electrical engineering. The device comprises a protective chassis, a direct-current power supply wiring terminal, a three-phase current input wiring terminal, a tripping switch piece, a direct-current switch, a comprehensive digital relay, a tripping output wiring terminal and an installation panel. The invention has the advantages that the device is small in size, light in weight, easy to carry and low in power; remote communication can be realized; the protective fault removing time of the device is short; the operating current and the operating time are wide in setting range and are easy to set; and the operating mode can be set by four groups of tripping switch pieces and also can be set by the comprehensive digital relay.

Description

technical field [0001] The invention belongs to the field of electrical engineering and automation thereof, and in particular relates to a portable microcomputer charging protection device and method. Background technique [0002] When carrying out charging tests on newly put into operation transmission lines and new equipment, a device called charging protection is put into operation. When a short-circuit fault occurs in the new input equipment due to insulation breakdown or insufficient electrical safety distance of the transmission line, the charging protection device will act to quickly cut off the faulty line or equipment. After the charging test is completed, the charging protection device will stop operating. The device can avoid the failure of the faulty line or equipment to be cut off in time, resulting in the power failure of the associated transmission line in the power system, and the disconnection of the associated power plant and the power system, which cannot ...

AI Technical Summary

Problems solved by technology

[0004] (1) The charging protection device is a three-stage current protection device composed of 16 electromagnetic current relays, time relays, signal relays and intermediate relays. It is bulky and not easy to carry for testing;

[0005] (2) For the first charging test of transmission lines with a voltage level of 220kV and above, the protection action time is required to be no more than 10mms, and the inherent action time of the charging protection device composed of 16 electromagnetic relays is close to 100mms, which makes the protection and removal of faults take a long time, causing power failure. The system fluctuates, and its safe and stable operation is seriously affected;

[0006] (3) The first charging test of a 500kV transmission line requires a minimum setting current of 0.3A for charging protection, but the minimum setting current for the charging protection device is 0.5A using a DL-type electromagnetic current relay. , the charging protection may refuse to operate, and the fault cannot be removed;

[0007] (4) Setting of the charging protection operating current and operating time: the technician first opens the sealing cover of the electromagnetic current relay and the time relay, and then toggles the relay setting handle to set the fixed value, so the setting is inconvenient, the setting value is inaccurate, and the error Big;

[0008] (5) When the short-circuit current of the power system is close to the charging protection action current, the contacts of the electromagnetic current relay vibrate and generate an arc, which is easy to burn out the current relay;

[0009] (6) The electromagnetic interference of power plants and substations is relatively large, which makes the charging protection device composed of electromagnetic relays prone to malfunction;

[0010] (7) The remote "four remote" communication between the charging protection device and the microcomputer monitoring system of the power plant and substation cannot be realized, and the remote control center cannot understand the charging protection action information;

[0011] (8) The electromagnetic relay adopts the electromagnetic working principle, so the power loss of the coil of the relay is large, and the coil is easy to heat up, which causes the relay to burn out

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