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Current-based longitudinal differential protection method and system for belt conveyor

A technology of longitudinal differential protection and belt conveyor, applied in the direction of protection reacting to overcurrent, emergency protection device for automatic disconnection, emergency protection circuit device, etc. Problems such as expansion, refusal and misoperation, to achieve the effect of improving accuracy and reliability, high accuracy and reliability, and avoiding the expansion of defects

Active Publication Date: 2021-08-20
华能(上海)电力检修有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. There are many external protection components and signal transmission lines, which not only increases the workload of daily inspection and maintenance, but also because the environment of the coal conveying belt conveyor is mostly humid and dusty, the external protection components are prone to defects, resulting in refusal and malfunction If the external protection refuses to move, the failure of the belt conveyor will expand, and the malfunction of the external protection will cause the belt conveyor to fail to operate normally.
[0005] 2. The external protection of the coal conveying belt conveyor cannot act on the faults such as tape tearing and coal leakage that are prone to occur in the belt conveyor, and the manpower, material resources, and time spent to repair such faults are quite large, which increases the operation and maintenance cost, and at the same time Due to the belt conveyor being out of service due to a long-term breakdown and emergency repair, it was impossible to increase the warehouse, resulting in the lack of coal in the raw coal bunker of the generator set, and the generator set was forced to stop, which greatly threatened the safety of the system.

Method used

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  • Current-based longitudinal differential protection method and system for belt conveyor
  • Current-based longitudinal differential protection method and system for belt conveyor
  • Current-based longitudinal differential protection method and system for belt conveyor

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Experimental program
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Effect test

Embodiment 1

[0063] A current-based longitudinal differential protection method for belt conveyors, which is used to protect the belt conveyors during operation, such as figure 2 The protection method is based on the belt conveyor motor protection device. The belt conveyor motor protection device includes current transformers, current transmitters, PLCs, upper computers and contactors on the belt conveyor motors. The current transformers are connected in series to each belt conveyor in the coal conveying system. In the power circuit of the motor, the current transformer collects the effective value of the current of the belt conveyor and sends it to the current transmitter. The auxiliary contact signal is sent to the PLC switch input terminal as the data for the PLC to judge the running state of the belt conveyor motor. The PLC sends an alarm to the upper computer, and the staff checks the alarm through the upper computer. The isolation relay is connected to the contactor trip circuit.

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Embodiment 2

[0100] A current-based longitudinal differential protection system for belt conveyors, including a no-load judging module, a current acquisition module, a no-load protection module and a load protection module;

[0101] The current acquisition module periodically collects and stores the current value of the belt conveyor;

[0102] The no-load judging module judges whether the belt conveyor is running without load, if so, the no-load protection module protects the belt conveyor through the no-load protection step, otherwise the load protection module protects the belt conveyor through the load protection step;

[0103] The no-load protection module includes a data packing unit, a difference calculation unit, a first protection unit and a data update unit, and the no-load protection steps include:

[0104] The data packing unit packs the set number of current values ​​collected continuously into a set of current time series data;

[0105] The difference calculation unit calcula...

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Abstract

The invention relates to a current-based longitudinal differential protection method and system for a belt conveyor, which are used for protecting the belt conveyor during operation. The method comprises the following steps of periodically collecting the current value of the belt conveyor, and judging whether the belt conveyor is in no-load operation or not, if yes, protecting the belt conveyor through the no-load protection step, and if not, protecting the belt conveyor through the load protection step. Compared with the prior art, the method has the advantages of high accuracy, high reliability, good safety, strong timeliness and the like.

Description

technical field [0001] The invention relates to a coal conveying belt conveyor protection technology, in particular to a current-based longitudinal differential protection method and system for a belt conveyor. Background technique [0002] At present, the external protection of the coal conveying belt conveyor mainly includes rope protection, deviation protection, slip protection and coal blocking protection. The rope protection action is activated when the inspector finds an abnormality at the scene and manually stops; the deviation protection detects that the position of the belt has shifted and operates; the slip protection detects that the driven drum rotates at a low speed and operates; the coal blocking protection detects coal falling The coal level in the pipe is too high and the action occurs. Although the belt conveyor motor has overcurrent protection, the design purpose of this protection is to protect the motor winding from overheating and burning. [0003] Und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/04B65G43/02B65G43/00B65G15/00
CPCH02H3/08H02H3/04B65G43/02B65G43/00B65G15/00
Inventor 陈建康李梁华顾晔维
Owner 华能(上海)电力检修有限责任公司
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