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Grounding short-circuiting apparatus of urban mass transit power supply system and grounding short-circuit method thereof

A technology for urban rail transit and grounding short circuit, which is applied in the field of grounding short circuit devices for urban rail transit power supply systems, and can solve problems such as affecting transportation, being easily accessible to personnel, and taking a long time

Active Publication Date: 2016-01-20
CHENGDU HEZHONGDA ELECTRIC TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole operation process is entirely manual, with low degree of automation, long time-consuming, low maintenance or overhaul efficiency, especially if there is no mandatory electrical inspection before connecting the ground wire, there is a potential safety hazard of connecting the ground wire with electricity. After the maintenance or overhaul is completed, It is possible to transmit power with a ground wire, causing major personnel and equipment accidents
[0005] Another grounding method is to fix the grounding device in the power supply system. One end of the high-voltage primary circuit is connected to the catenary or contact rail, and the other end is connected to the steel rail, and the primary circuit components are always in the live working state. The electroscope with the function of electric inspection becomes the live display with the function of live display, without considering the influence of rail potential and electromagnetic compatibility on the equipment
Once the electrical inspection detection circuit of the grounding device fails, it may cause the feeder circuit breaker of the traction substation to trip and the device cannot be quickly and effectively separated from the power supply system, and the fault isolation cannot be realized. A power supply accident occurs, and the power supply system cannot supply power to the traction rolling stock normally. Affect train operation, thereby affecting transportation
In addition, this kind of grounding device needs to lead the overhead catenary to the ground through high-voltage cables. The body is bulky and easily occupies the limited space in the tunnel

Method used

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  • Grounding short-circuiting apparatus of urban mass transit power supply system and grounding short-circuit method thereof
  • Grounding short-circuiting apparatus of urban mass transit power supply system and grounding short-circuit method thereof
  • Grounding short-circuiting apparatus of urban mass transit power supply system and grounding short-circuit method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0069] a kind of like Figure 1~13 , 16, 18 shown in the urban rail transit power supply system grounding short-circuit device, including at least one grounding mechanism 2 and its one-to-one corresponding control terminal 3, the positive pole fixed connection point 14, the negative pole fixed connection point 12 of the grounding mechanism are respectively in contact with The positive output line and the negative output line of the primary high-voltage side 1 of the grid or contact rail are connected, and the grounding mechanism 2 is connected to the corresponding control terminal 3 through the control cable, power cable and aviation plug. The grounding mechanism 2 and the corresponding control terminal 3 can be nearby For installation, the control terminal 3 can also be installed at a convenient location away from the corresponding grounding mechanism 2 according to the specific space conditions on site.

[0070] A centralized control center 4 for controlling all control term...

specific Embodiment approach 2

[0092] a kind of like Figure 1~12 , 14, 16, and 18 shown in the urban rail transit power supply system use the grounding short-circuit device, the same as the specific embodiment one, the difference is:

[0093] The test rod is an external pressure coil spring contact structure ， The external pressure coil spring type contact structure includes an insulating shaft 9, a positive electrode test rod 16 arranged at both ends of the insulating shaft 9, a negative electrode test rod 10, and a positive electrode test rod 6 and a negative electrode test rod 4 connected respectively. The contact piece 20 is provided with a coil spring 18 perpendicular to the plane of the contact piece. The contact piece 20 is not deformed.

specific Embodiment approach 3

[0094] a kind of like Figure 1~12 , 15, 17, and 18 show the grounding short-circuit device for the power supply system of urban rail transit, which is the same as the specific embodiment 1. The difference is that the electric detection rod is an externally pressed leaf spring contact structure, and the externally pressed leaf spring contact structure includes The insulating shaft 9, the positive pole 16 and the negative pole 10 arranged at both ends of the insulating shaft 9, and the contact piece 20 connected to the positive pole 16 and the negative pole 10 respectively, are on the contact piece 20 The leaf spring 19 with two ends on the plane of the contact piece 20 and an outwardly protruding arc in the middle is arranged, the contact piece 20 is not deformed, and the contact pressure is ensured by the deformation of the leaf spring 19 when the moving contact contacts the static contact.

[0095] The first voltage dividing resistor R and the second voltage dividing resisto...

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Abstract

The invention provides a grounding short-circuiting apparatus of an urban mass transit power supply system and a grounding short-circuit method thereof. The apparatus comprises at least one grounding mechanism and a control terminal. The grounding mechanism includes an electric transmission pair provided with a shifting fork linked with a transmission shaft, an electroscope rod cranking arm, and a ground rod cranking arm, wherein the electroscope rod cranking arm and the ground rod cranking arm that are arranged coaxially are driven by the shifting fork to make rotation and a rotation angel difference exits between the electroscope rod cranking arm and the ground rod. The grounding mechanism also contains a knife switch type electroscope device containing a self checking module and an electroscope module. Besides, the control terminal includes an information processing and control module, a communication module, and a case. A centralized control center consists of a centralized control center case, a PLC processing module, a communication module, a disk surface operation indication module, and an industrial computer human computer interaction module. According to the invention, the apparatus is integrated with the self checking module, the electroscope module and the grounding module; and the self checking and electroscope share a knife switch type contact. The installation becomes flexible; a phenomenon that equipment is transported because of difference maintenance or repairing positions can be avoided and connection with a ground wire is not required; and the electric operation automation degree is high. And an enough safety distance is formed between a primary high voltage side and an operation component.

Description

technical field [0001] The invention relates to urban rail transit power supply, in particular to a grounding short-circuit device and a grounding short-circuit method for an urban rail transit power supply system. Background technique [0002] When the urban rail transit power supply system is operated, maintained or overhauled, it is required to enforce the national power industry standard DL / T879-2004 "Portable Grounding and Grounding Short-Circuit Devices for Live Work". It is not only necessary to interrupt the power supply of catenary or contact rail, but also to install a grounding short-circuit device to guide current separation in the event of a power failure to protect the personal safety of workers in the maintenance or inspection area. The grounding operation process is to manually connect the grounding wire to the rail reliably, then test the electroscope on the live part to verify that the performance of the electroscope is intact, and finally test the power in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60M1/28H01R4/66G01R19/25
Inventor 王滢马友平柳锐何小燕田海生
Owner CHENGDU HEZHONGDA ELECTRIC TECH CO LTD
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