Intelligent safe power supply for electric locomotive overhead lines
A technology for overhead lines and electric locomotives, which is applied to power lines, vehicle components, transportation and packaging, etc., and can solve problems such as safety accidents, shortening the live running time of overhead lines, and wrong power transmission.
Inactive Publication Date: 2012-02-01
临沂施乃通电气技术有限公司
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Problems solved by technology
Although this method is reliable, due to manual operation, it is far from meeting the requirements in terms of response time and work efficiency, and it also brings unsafe hidden dangers caused by this operation.
The Chinese patent discloses a "Automatic stop and power transmission device for the overhead line of the electric locomotive". However, there are also the following problems, that is, when low-voltage power supply occurs, once leakage or small current leakage occurs, the PLC will issue power supply instructions again, resulting in wrong power transmission, which is more likely to cause safety accidents
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[0010] Such as figure 1 As shown, the intelligent electric locomotive overhead line safety power supply has a housing on which there are four terminals, namely A, B, C, and D, and an overhead line automatic stop and power transmission circuit is installed in the housing. , the circuit has a DC power supply U lower than the safe voltage, the negative pole of the DC power supply U is connected between the terminals C and D, and the positive pole is connected in series with a small current detector L 1 , leakage current detector L 2 Finally, it is connected to the terminal B; it also has a current transmitter FL, a line switch K and a PLC program controller, one end of the current transmitter FL is connected to the terminal B, and the other end is connected in series with the line switch K to connect Terminal A, the signal terminal of the current transmitter FL is connected to an input terminal of the PLC program controller, the output terminal of the PLC program controller is c...
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The invention discloses an intelligent safe power supply for electric locomotive overhead lines. The intelligent safe power supply comprises a shell, wherein the shell is provided with four wiring terminals, respectively, A, B, C and D; an automatic overhead line stop-supply circuit is mounted in the shell, and the circuit has a direct-current source U of which voltage is lower than the safe voltage; a cathode of the direct-current source U is connected between the wiring terminal C and the wiring terminal D, and an anode of the direct-current source U is connected in series with a low current detector L1 and a leakage current detector L2 in sequence and then is connected with the wiring terminal B; and the circuit further comprises a current transducer FL, a line switch K and a PLC (Programmable Logic Controller), wherein the output ends of the low current detector L1 and the leakage current detector L2 are respectively connected with the input end of the PLC. By adoption of the technical scheme, long-term power supply of the overhead lines can be changed into short-time power supply, namely, the power is only supplied for an electric locomotive operating section, and other overhead lines are all in power failure state; specially, a leakage current detection circuit is provided, thereby avoiding the phenomenon that the PLC sends a power supply instruction again to supply power by mistake in case of electric leakage, and further guaranteeing the safety of people walking under the overhead lines, and reducing personal electric shock accidents.
Description
technical field [0001] The invention relates to a kind of electrical equipment used in mines, in particular to a kind of intelligent stop and sender for overhead lines of mine electric locomotives. Background technique [0002] At present, the underground overhead lines of electric locomotives used in mines in my country generally adopt partition insulation, that is, use partition switches for electrical connection, and some mines also install travel switches in the parking lot for fixed-point power-off. These methods all belong to the temporary short-term power outage in the parking lot, and the overhead line is always charged for a long time, and the voltage of the overhead line is generally higher, so electric shock accidents are easy to occur. The measures to realize the above-mentioned operation mode are almost all the operation methods of manually switching on and off the power transmission device or the partition switch to stop the power transmission in the parking lo...
Claims
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IPC IPC(8): B60M3/04
Inventor 李兴伟李兴刚李兴三刘凯
Owner 临沂施乃通电气技术有限公司