Secondary pressing plate forced locking device and method for forced locking thereof

Abstract

The invention provides a forced locking device for a secondary pressing plate and a forced locking method for the secondary pressing plate, and belongs to the field of misoperation prevention devices of power systems. The device comprises a housing, and also comprises an upper case, a lower case, a static contact clamping sleeve, a clamping sleeve internal rotating shaft, a locking sleeve dead clamping substrate left side, an internal locking tool, and an RFID code sheet. The upper case is provided with a movable contact locking sleeve, a rotating track slot protection board, an RFID code sheet installation groove, and a groove. The device can achieve the forced locking of the pressing plate, can enable the pressing plate to be completely disconnected, can effectively record the in-service and out-of-service states of the pressing plate, and can achieve installation when the secondary pressing plate is in operation.

Description

technical field [0001] The invention provides a forced locking device for a secondary pressing plate and a forced locking method thereof, which belong to the field of anti-misoperation devices for power systems. Background technique [0002] Substation switching operation is divided into two parts: switching on and off of primary equipment and corresponding secondary equipment. In the operation of secondary equipment, switching on and off of the secondary pressure plate of the protection device is the most important part. [0003] When the primary equipment fails, the secondary pressure plate installed on the protective screen is used to switch on and off the function of the protective device and the trip outlet circuit. Corresponding function, accurate judgment, reliable action to remove the key link of fault point. [0004] Whether the secondary pressure plate is put in and out is directly related to the protection function and whether the action outlet can function norma...

AI Technical Summary

Problems solved by technology

Accidents caused by artificially enlarged accidents caused by the secondary pressure plate of the protection device occasionally occurred. For example, in April 2008, the ratio differential protection of No. The substation tripped, resulting in no electricity in the two 110kV substations

In June 2012, a single-phase 330kV line of a 330kV substation was grounded instantaneously, and the protection tripped by mistake. The direct outlet tripped three phases due to mis-injection of the communication triple-trip pressure plate, and the 330kV line was blacked out.

In August 2014, a 330kV substation leapfrogged and tripped due to missing switch outlet pressure plate and failure of the pressure plate, resulting in no electricity in the 330kV substation

[0007] The defect of the above technology is that it is impossible to realize the mandatory locking of input and exit states in the true sense

When the operation and maintenance personnel put in the conventional protection connecting sheet type secondary pressure plate, although the pressure plate state sensor shows that the position is correct, there is a loophole that the pressure plate pressure joint is not crimped firmly, and the protection device cannot operate normally at the exit; at the same time, it is detected by the non-contact sensor Influenced by the position accuracy, when judging whether the secondary pressure plate is out of operation only through the light indication, there is a possibility that the conventional protection connecting piece type secondary pressure plate is not completely disconnected; in addition, although the logical association control of anti-misoperation locking is carried out on the secondary equipment, However, since there is no guarantee for the forced locking of the secondary protection pressure plate of the relay protection device, if there is a problem with the state sensor of the secondary pressure plate at this time, the microcomputer anti-misoperation locking system will lose its effect on the associated locking logic of the secondary pressure plate of the protection device during operation. , the indirect prompt locking function of the secondary pressure plate will be useless, which brings a huge hidden danger to the safe and stable operation of the equipment during the switching operation; finally, when installing and debugging, it is necessary to install a pressure plate state collector on each protective screen. And each pressing plate is wired, the installation is cumbersome, and it is impossible to realize the simple installation of the secondary pressing plate in the running state

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